This is in preparation for using write_idx_file(). Also, by using
sha1write() we get some buffering to reduces the number of write
syscalls, and the written data is SHA1 summed which allows for the extra
data integrity validation check performed in fixup_pack_header_footer()
(details on this in commit abeb40e5aa).
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Similar in spirit to 07cf0f2 (make --max-pack-size argument to 'git
pack-object' count in bytes, 2010-02-03) which made the option by the same
name to pack-objects, this counts the pack size limit in bytes.
In order not to cause havoc with people used to the previous megabyte
scale an integer smaller than 8192 is interpreted in megabytes but the
user gets a warning. Also a minimum size of 1 MiB is enforced to avoid an
explosion of pack files.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Manual merge made at 844ad3d (Merge branch 'sp/maint-fast-import-large-blob'
into sp/fast-import-large-blob, 2010-02-01) did not correctly reflect the change
of unit in which this variable's value is counted from its previous version.
Now it counts in bytes, not in megabytes.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
* sp/maint-fast-import-large-blob:
fast-import: Stream very large blobs directly to pack
bash: don't offer remote transport helpers as subcommands
Conflicts:
fast-import.c
If a blob is larger than the configured big-file-threshold, instead
of reading it into a single buffer obtained from malloc, stream it
onto the end of the current pack file. Streaming the larger objects
into the pack avoids the 4+ GiB memory footprint that occurs when
fast-import is processing 2+ GiB blobs.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* 'jh/notes' (early part):
Add more testcases to test fast-import of notes
Rename t9301 to t9350, to make room for more fast-import tests
fast-import: Proper notes tree manipulation
* sr/gfi-options:
fast-import: add (non-)relative-marks feature
fast-import: allow for multiple --import-marks= arguments
fast-import: test the new option command
fast-import: add option command
fast-import: add feature command
fast-import: put marks reading in its own function
fast-import: put option parsing code in separate functions
If you tried to export the official git repository, and then to import it
back then git-fast-import would die complaining that "Mark :1 not a commit".
Accordingly to a generated crash file, Mark 1 is not a commit but a blob,
which is pointed by junio-gpg-pub tag. Because git-tag allows to create such
tags, git-fast-import should import them.
Signed-off-by: Dmitry Potapov <dpotapov@gmail.com>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The fast-import parser does not validate that the author, committer
or tagger name component contains both a name and an email address.
Therefore the name component has always been optional. Correct the
documentation to match the implementation.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This patch teaches 'git fast-import' to automatically organize note objects
in a fast-import stream into an appropriate fanout structure. The notes API
in notes.h is NOT used to accomplish this, because trying to keep the
fast-import and notes data structures in sync would yield a significantly
larger patch with higher complexity.
Note objects are added with the 'N' command, and accounted for with a
per-branch counter, which is used to trigger fanout restructuring when
needed. Note that when restructuring the branch tree, _any_ entry whose
path consists of 40 hex chars (not including directory separators) will
be recognized as a note object. It is therefore not advisable to
manipulate note entries with M/D/R/C commands.
Since note objects are stored in the same tree structure as other objects,
the unloading and reloading of a fast-import branches handle note objects
transparently.
This patch has been improved by the following contributions:
- Shawn O. Pearce: Several style- and logic-related improvements
Cc: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
After specifying 'feature relative-marks' the paths specified with
'feature import-marks' and 'feature export-marks' are relative to an
internal directory in the current repository.
In git-fast-import this means that the paths are relative to the
'.git/info/fast-import' directory. However, other importers may use a
different location.
Add 'feature non-relative-marks' to disable this behavior, this way
it is possible to, for example, specify the import-marks location as
relative, and the export-marks location as non-relative.
Also add tests to verify this behavior.
Cc: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The --import-marks= option may be specified multiple times on the
commandline and should result in all marks being read in. Only one
import-marks feature may be specified in the stream, which is
overriden by any --import-marks= commandline options.
If one wishes to specify import-marks files in addition to the one
specified in the stream, it is easy to repeat the stream option as a
--import-marks= commandline option.
Also verify this behavior with tests.
Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This allows the frontend to specify any of the supported options as
long as no non-option command has been given. This way the
user does not have to include any frontend-specific options, but
instead she can rely on the frontend to tell fast-import what it
needs.
Also factor out parsing of argv and have it execute when we reach the
first non-option command, or after all commands have been read and
no non-option command has been encountered.
Non-git options are ignored, unrecognised options result in an error.
Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This allows the fronted to require a specific feature to be supported
by the backend, or abort.
Also add support for four initial feature, date-format=, force=,
import-marks=, export-marks=.
Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
All options do nothing but set settings, with the exception of the
--input-marks option. Delay the reading of the marks file till after
all options have been parsed.
Also, rename mark_file to export_marks_file as it is now ambiguous.
Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Putting the options in their own functions increases readability of
the option parsing block and makes it easier to reuse the option
parsing code later on.
Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* 'jh/notes' (early part):
Add selftests verifying concatenation of multiple notes for the same commit
Refactor notes code to concatenate multiple notes annotating the same object
Add selftests verifying that we can parse notes trees with various fanouts
Teach the notes lookup code to parse notes trees with various fanout schemes
Teach notes code to free its internal data structures on request
Add '%N'-format for pretty-printing commit notes
Add flags to get_commit_notes() to control the format of the note string
t3302-notes-index-expensive: Speed up create_repo()
fast-import: Add support for importing commit notes
Teach "-m <msg>" and "-F <file>" to "git notes edit"
Add an expensive test for git-notes
Speed up git notes lookup
Add a script to edit/inspect notes
Introduce commit notes
Conflicts:
.gitignore
Documentation/pretty-formats.txt
pretty.c
Let "git fast-import -h" (with no other arguments) print usage
before exiting, even when run outside any repository.
Cc: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Introduce a 'notemodify' subcommand of the 'commit' command. This subcommand
is similar to 'filemodify', except that no mode is supplied (all notes have
mode 0644), and the path is set to the hex SHA1 of the given "comittish".
This enables fast import of note objects along with their associated commits,
since the notes can now be named using the mark references of their
corresponding commits.
The patch also includes a test case of the added functionality.
Signed-off-by: Johan Herland <johan@herland.net>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When reading the "raw format" timestamp from the input stream, make sure
that the timezone offset is a reasonable value by imitating 7122f82
(date.c: improve guess between timezone offset and year., 2006-06-08).
We _might_ want to also check if the timestamp itself is reasonable, but
that is left for a separate commit.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Lots of die() calls did not actually report the kind of error, which
can leave the user confused as to the real problem. Use die_errno()
where we check a system/library call that sets errno on failure, or
one of the following that wrap such calls:
Function Passes on error from
-------- --------------------
odb_pack_keep open
read_ancestry fopen
read_in_full xread
strbuf_read xread
strbuf_read_file open or strbuf_read_file
strbuf_readlink readlink
write_in_full xwrite
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Change calls to die(..., strerror(errno)) to use the new die_errno().
In the process, also make slight style adjustments: at least state
_something_ about the function that failed (instead of just printing
the pathname), and put paths in single quotes.
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* ar/unlink-err:
print unlink(2) errno in copy_or_link_directory
replace direct calls to unlink(2) with unlink_or_warn
Introduce an unlink(2) wrapper which gives warning if unlink failed
Essentially; s/type* /type */ as per the coding guidelines.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This helps to notice when something's going wrong, especially on
systems which lock open files.
I used the following criteria when selecting the code for replacement:
- it was already printing a warning for the unlink failures
- it is in a function which already printing something or is
called from such a function
- it is in a static function, returning void and the function is only
called from a builtin main function (cmd_)
- it is in a function which handles emergency exit (signal handlers)
- it is in a function which is obvously cleaning up the lockfiles
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A few more fixes on top of the automatic spell checker generated ones.
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* jc/shared-literally:
t1301: loosen test for forced modes
set_shared_perm(): sometimes we know what the final mode bits should look like
move_temp_to_file(): do not forget to chmod() in "Coda hack" codepath
Move chmod(foo, 0444) into move_temp_to_file()
"core.sharedrepository = 0mode" should set, not loosen
When writing out a loose object or a pack (index), move_temp_to_file() is
called to finalize the resulting file. These files (loose files and packs)
should all have permission mode 0444 (modulo adjust_shared_perm()).
Therefore, instead of doing chmod(foo, 0444) explicitly from each callsite
(or even forgetting to chmod() at all), do the chmod() call from within
move_temp_to_file().
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
These variables were unused and can be removed safely:
builtin-clone.c::cmd_clone(): use_local_hardlinks, use_separate_remote
builtin-fetch-pack.c::find_common(): len
builtin-remote.c::mv(): symref
diff.c::show_stats():show_stats(): total
diffcore-break.c::should_break(): base_size
fast-import.c::validate_raw_date(): date, sign
fsck.c::fsck_tree(): o_sha1, sha1
xdiff-interface.c::parse_num(): read_some
Signed-off-by: Benjamin Kramer <benny.kra@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In a repository created with git older than f49fb35 (git-init-db: create
"pack" subdirectory under objects, 2005-06-27), objects/pack/ directory is
not created upon initialization. It was Ok because subdirectories are
created as needed inside directories init-db creates, and back then,
packfiles were recent invention.
After the said commit, new codepaths started relying on the presense of
objects/pack/ directory in the repository. This was exacerbated with
8b4eb6b (Do not perform cross-directory renames when creating packs,
2008-09-22) that moved the location temporary pack files are created from
objects/ directory to objects/pack/ directory, because moving temporary to
the final location was done carefully with lazy leading directory creation.
Many packfile related operations in such an old repository can fail
mysteriously because of this.
This commit introduces two helper functions to make things work better.
- odb_mkstemp() is a specialized version of mkstemp() to refactor the
code and teach it to create leading directories as needed;
- odb_pack_keep() refactors the code to create a ".keep" file while
create leading directories as needed.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Otherwise we may reuse the same memory address for a totally
different "struct packed_git", and a previously cached object from
the prior occupant might be returned when trying to unpack an object
from the new pack.
Found-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Programs that use git_config need to find the global configuration.
When runtime prefix computation is enabled, this requires that
git_extract_argv0_path() is called early in the program's main().
This commit adds the necessary calls.
Signed-off-by: Steffen Prohaska <prohaska@zib.de>
Acked-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"S_IFREG | mode" makes only sense for 0644 and 0755.
Even though doing (S_IFREG | mode) may not hurt when mode is any other
supported value, that is only true because S_IFREG mode bit happens to
be already on for S_IFLNK or S_IFGITLINK.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Store the return value of strtoul() in order to avoid compiler
warnings on Ubuntu 8.10.
Also check errno after each call, which is the only way to notice
an overflow without making ULONG_MAX an illegal date.
Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Even though newer Porcelain tools always record the tagger information
when creating new tags, export/import pair should be able to faithfully
reproduce ancient tag objects that lack tagger information.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
* maint:
fast-import: close pack before unlinking it
pager: do not dup2 stderr if it is already redirected
git-show: do not segfault when showing a bad tag
This is sort of a companion patch to 4723ee9(Close files opened by
lock_file() before unlinking.): on Windows, you cannot delete what
is still open.
This makes test 9300-fast-import pass on Windows for me; quite a few
fast-imports leave temporary packs until the test "blank lines not
necessary after other commands" actually tests for the number of files
in .git/objects/pack/, which has a few temporary packs now.
I guess that 8b4eb6b(Do not perform cross-directory renames when
creating packs) was "responsible" for the breakage.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Internal "allocate in bulk, we will never free this memory anyway"
allocator used in fast-import had a logic to round up the size of the
requested memory block in a wrong place (it computed if the available
space is enough to fit the request first, and then carved a chunk of
memory by size rounded up to the alignment, which could go beyond the
actually available space).
Signed-off-by: Junio C Hamano <gitster@pobox.com>
On ARM I have the following compilation errors:
CC fast-import.o
In file included from cache.h:8,
from builtin.h:6,
from fast-import.c:142:
arm/sha1.h:14: error: conflicting types for 'SHA_CTX'
/usr/include/openssl/sha.h:105: error: previous declaration of 'SHA_CTX' was here
arm/sha1.h:16: error: conflicting types for 'SHA1_Init'
/usr/include/openssl/sha.h:115: error: previous declaration of 'SHA1_Init' was here
arm/sha1.h:17: error: conflicting types for 'SHA1_Update'
/usr/include/openssl/sha.h:116: error: previous declaration of 'SHA1_Update' was here
arm/sha1.h:18: error: conflicting types for 'SHA1_Final'
/usr/include/openssl/sha.h:117: error: previous declaration of 'SHA1_Final' was here
make: *** [fast-import.o] Error 1
This is because openssl header files are always included in
git-compat-util.h since commit 684ec6c63c whenever NO_OPENSSL is not
set, which somehow brings in <openssl/sha1.h> clashing with the custom
ARM version. Compilation of git is probably broken on PPC too for the
same reason.
Turns out that the only file requiring openssl/ssl.h and openssl/err.h
is imap-send.c. But only moving those problematic includes there
doesn't solve the issue as it also includes cache.h which brings in the
conflicting local SHA1 header file.
As suggested by Jeff King, the best solution is to rename our references
to SHA1 functions and structure to something git specific, and define those
according to the implementation used.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
A comment on top of create_tmpfile() describes caveats ('can have
problems on various systems (FAT, NFS, Coda)') that should apply
in this situation as well. This in the end did not end up solving
any of my personal problems, but it might be a useful cleanup patch
nevertheless.
Signed-off-by: Petr Baudis <pasky@suse.cz>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* np/maint-safer-pack:
fixup_pack_header_footer(): use nicely aligned buffer sizes
index-pack: use fixup_pack_header_footer()'s validation mode
pack-objects: use fixup_pack_header_footer()'s validation mode
improve reliability of fixup_pack_header_footer()
pack-objects: improve returned information from write_one()
Some systems (like e.g. OpenSolaris) define pid_t as long,
therefore all our sprintf that use %i/%d cause a compiler warning
beacuse of the implicit long->int cast. To make sure that
we fit the limits, we display pids as PRIuMAX and cast them explicitly
to uintmax_t.
Signed-off-by: David Soria Parra <dsp@php.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Currently, this function has the potential to read corrupted pack data
from disk and give it a valid SHA1 checksum. Let's add the ability to
validate SHA1 checksum of existing data along the way, including before
and after any arbitrary point in the pack.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Currently fast-import/export cannot be used for
repositories with submodules. This patch extends
the relevant programs to make them correctly
process gitlinks.
Links can be represented by two forms of the
Modify command:
M 160000 SHA1 some/path
which sets the link target explicitly, or
M 160000 :mark some/path
where the mark refers to a commit. The latter
form can be used by importing tools to build
all submodules simultaneously in one physical
repository, and then simply fetch them apart.
Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When you misuse a git command, you are shown the usage string.
But this is currently shown in the dashed form. So if you just
copy what you see, it will not work, when the dashed form
is no longer supported.
This patch makes git commands show the dash-less version.
For shell scripts that do not specify OPTIONS_SPEC, git-sh-setup.sh
generates a dash-less usage string now.
Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This means that we can depend on packs always being stable on disk,
simplifying a lot of the object serialization worries. And unlike loose
objects, serializing pack creation IO isn't going to be a performance
killer.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
There is a cmd_merge() function in fast-import that will conflict with
builtin-merge's cmd_merge() function. To keep it consistent, rename all
cmd_*() function to parse_*()
Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git_config() only had a function parameter, but no callback data
parameter. This assumes that all callback functions only modify
global variables.
With this patch, every callback gets a void * parameter, and it is hoped
that this will help the libification effort.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Creating a branch in fast-import and then resetting it without making
any further commits to it currently causes an error message at the
end of the import.
This error is triggered by cvs2svn's git backend, which uses a
temporary fixup branch when it creates tags, because the fixup branch
is reset after each tag.
This patch prevents the error, allowing "reset" to be used to delete
temporary branches.
Signed-off-by: Eyvind Bernhardsen <eyvind-git@orakel.ntnu.no>
Acked-by: Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* maint:
GIT 1.5.4.4
ident.c: reword error message when the user name cannot be determined
Fix dcommit, rebase when rewriteRoot is in use
Really make the LF after reset in fast-import optional
cmd_from() ends with a call to read_next_command(), which is needed
when using cmd_from() from commands where from is not the last element.
With reset, however, "from" is the last command, after which the flow
returns to the main loop, which calls read_next_command() again.
Because of this, always set unread_command_buf in cmd_reset_branch(),
even if cmd_from() was successful.
Add a test case for this in t9300-fast-import.sh.
Signed-off-by: Adeodato Simó <dato@net.com.org.es>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git fast-import expects to be run from an existing (possibly
empty) repository. It was dying with a suboptimal message if that
wasn't the case.
Signed-off-by: Jean-Luc Herren <jlh@gmx.ch>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
If fast-import is in the middle of crashing due to a protocol error
or something like that then it can be very useful to have the mark
table and all objects up until that point be available for a new
import to resume from.
Currently we just close the active packfile, unkeep all of our
newly created packfiles (so they can be deleted), and dump the
marks table to a temporary file.
We don't attempt to update the refs/tags that the process has in
memory as much of that data can be found in the crash report and I'm
not sure it would be the right thing to do under every type of crash.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If fast-import was not run with --export-marks but we are crashing
the frontend application developer may still benefit from having
that information available to them. We now include the marks table
as part of the crash report if --export-marks was not supplied on
the command line.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If annotated tags were created they exist in a different namespace
within the fast-import process' internal memory tables so we did
not export them in the inactive branch table. Now they are written
out after the branches, in the order that they were defined by the
frontend process.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If the tree object we have asked for is deltafied in the packfile and
the delta did not apply correctly or was not able to be decompressed
from the packfile then we can get back NULL instead of the tree data.
This is (part of) the reason why read_sha1_file() can return NULL, so
we need to also handle it the same way.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio pointed out this part of fast-import wasn't very clear on
initial read, and it took some time for someone who was new to
fast-import's "dirty little tricks" to understand how this was
even working. So a little bit of commentary in the proper place
may help future readers.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We now use the configured pack.compression and pack.depth values
within fast-import, as like builtin-pack-objects fast-import is
generating a packfile for consumption by the Git tools.
We use the same behavior as builtin-pack-objects does for these
options, allowing core.compression to supply the default value
for pack.compression.
The default setting for pack.depth within fast-import is still 10
as users will generally repack fast-import generated packfiles by
`repack -f`. A large delta depth within the fast-import packfile
can significantly slow down such a later repack.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Without this change, each diagnostic could use an errno value
clobbered by the close or unlink in rollback_lock_file.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fast-import was relying on the fact that on most systems mmap() and
write() are synchronized by the filesystem's buffer cache. We were
relying on the ability to mmap() 20 bytes beyond the current end
of the file, then later fill in those bytes with a future write()
call, then read them through the previously obtained mmap() address.
This isn't always true with some implementations of NFS, but it is
especially not true with our NO_MMAP=YesPlease build time option used
on some platforms. If fast-import was built with NO_MMAP=YesPlease
we used the malloc()+pread() emulation and the subsequent write()
call does not update the trailing 20 bytes of a previously obtained
"mmap()" (aka malloc'd) address.
Under NO_MMAP that behavior causes unpack_entry() in sha1_file.c to
be unable to read an object header (or data) that has been unlucky
enough to be written to the packfile at a location such that it
is in the trailing 20 bytes of a window previously opened on that
same packfile.
This bug has gone unnoticed for a very long time as it is highly data
dependent. Not only does the object have to be placed at the right
position, but it also needs to be positioned behind some other object
that has been accessed due to a branch cache invalidation. In other
words the stars had to align just right, and if you did run into
this bug you probably should also have purchased a lottery ticket.
Fortunately the workaround is a lot easier than the bug explanation.
Before we allow unpack_entry() to read data from a pack window
that has also (possibly) been modified through write() we force
all existing windows on that packfile to be closed. By closing
the windows we ensure that any new access via the emulated mmap()
will reread the packfile, updating to the current file content.
This comes at a slight performance degredation as we cannot reuse
previously cached windows when we update the packfile. But it
is a fairly minor difference as the window closes happen at only
two points:
- When the packfile is finalized and its .idx is generated:
At this stage we are getting ready to update the refs and any
data access into the packfile is going to be random, and is
going after only the branch tips (to ensure they are valid).
Our existing windows (if any) are not likely to be positioned
at useful locations to access those final tip commits so we
probably were closing them before anyway.
- When the branch cache missed and we need to reload:
At this point fast-import is getting change commands for the next
commit and it needs to go re-read a tree object it previously
had written out to the packfile. What windows we had (if any)
are not likely to cover the tree in question so we probably were
closing them before anyway.
We do try to avoid unnecessarily closing windows in the second case
by checking to see if the packfile size has increased since the
last time we called unpack_entry() on that packfile. If the size
has not changed then we have not written additional data, and any
existing window is still vaild. This nicely handles the cases where
fast-import is going through a branch cache reload and needs to read
many trees at once. During such an event we are not likely to be
updating the packfile so we do not cycle the windows between reads.
With this change in place t9301-fast-export.sh (which was broken
by c3b0dec509) finally works again.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We also move the assignment of -1 to the lock file descriptor
up, so that rollback_lock_file() can be called safely after a
possible attempt to fclose(). This matches the contents of
the 'if' statement just above testing success of fdopen().
Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
I noticed some unchecked writes. This fixes them.
* bundle.c (create_bundle): Die upon write failure.
* fast-import.c (keep_pack): Die upon write or close failure.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This updates send-pack and fast-import to use symbolic constants
for checking the return values from check_ref_format(), and also
futureproof the logic in lock_any_ref_for_update() to explicitly
name the case that is usually considered an error but is Ok for
this particular use.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The specialized pool allocator fast-import uses aligned objects on the
size of a pointer, which was not sufficient at least on Sparc. Instead,
make the alignment for objects of type unitmax_t.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* maint:
git-clean: honor core.excludesfile
Documentation: Fix man page breakage with DocBook XSL v1.72
git-remote.txt: fix typo
core-tutorial.txt: Fix argument mistake in an example.
replace reference to git-rm with git-reset in git-commit doc
Grammar fixes for gitattributes documentation
Don't allow fast-import tree delta chains to exceed maximum depth
revert/cherry-pick: allow starting from dirty work tree.
t/t3404: fix test for a bogus todo file.
Conflicts:
fast-import.c
Brian Downing noticed fast-import can produce tree depths of up
to 6,035 objects and even deeper. Long delta chains can create
very small packfiles but cause problems during repacking as git
needs to unpack each tree to count the reachable blobs.
What's happening here is the active branch cache isn't big enough.
We're swapping out the branch and thus recycling the tree information
(struct tree_content) back into the free pool. When we later reload
the tree we set the delta_depth to 0 but we kept the tree we just
reloaded as a delta base.
So if the tree we reloaded was already at the maximum depth we
wouldn't know it and make the new tree a delta. Multiply the
number of times the branch cache has to swap out the tree times
max_depth (10) and you get the maximum delta depth of a tree created
by fast-import. In Brian's case above the active branch cache had
to swap the branch out 603/604 times during this import to produce
a tree with a delta depth of 6035.
Acked-by: Brian Downing <bdowning@lavos.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Without this strbuf_detach(), it yields a double free later, the
command is in fact stashed, and this is not a memory leak.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* maint:
Describe more 1.5.3.5 fixes in release notes
Fix diffcore-break total breakage
Fix directory scanner to correctly ignore files without d_type
Improve receive-pack error message about funny ref creation
fast-import: Fix argument order to die in file_change_m
git-gui: Don't display CR within console windows
git-gui: Handle progress bars from newer gits
git-gui: Correctly report failures from git-write-tree
gitk.txt: Fix markup.
send-pack: respect '+' on wildcard refspecs
git-gui: accept versions containing text annotations, like 1.5.3.mingw.1
git-gui: Don't crash when starting gitk from a browser session
git-gui: Allow gitk to be started on Cygwin with native Tcl/Tk
git-gui: Ensure .git/info/exclude is honored in Cygwin workdirs
git-gui: Handle starting on mapped shares under Cygwin
git-gui: Display message box when we cannot find git in $PATH
git-gui: Avoid using bold text in entire gui for some fonts
The arguments to the "Not a blob" die call in file_change_m were
transposed, so that the command was printed as the type, and the type
as the command. Switch them around so that the error message comes
out correctly.
Signed-off-by: Julian Phillips <julian@quantumfyre.co.uk>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
For that purpose, the ->buf is always initialized with a char * buf living
in the strbuf module. It is made a char * so that we can sloppily accept
things that perform: sb->buf[0] = '\0', and because you can't pass "" as an
initializer for ->buf without making gcc unhappy for very good reasons.
strbuf_init/_detach/_grow have been fixed to trust ->alloc and not ->buf
anymore.
as a consequence strbuf_detach is _mandatory_ to detach a buffer, copying
->buf isn't an option anymore, if ->buf is going to escape from the scope,
and eventually be free'd.
API changes:
* strbuf_setlen now always works, so just make strbuf_reset a convenience
macro.
* strbuf_detatch takes a size_t* optional argument (meaning it can be
NULL) to copy the buffer's len, as it was needed for this refactor to
make the code more readable, and working like the callers.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If the gain is not obvious in the diffstat, the resulting code is more
readable, _and_ in checkout-index/update-index we now reuse the same buffer
to unquote strings instead of always freeing/mallocing.
This also is more coherent with the next patch that reworks quoting
functions.
The quoting function is also made more efficient scanning for backslashes
and treating portions of strings without a backslash at once.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Add strbuf_remove, change strbuf_insert:
As both are special cases of strbuf_splice, implement them as such.
gcc is able to do the math and generate almost optimal code this way.
Add strbuf_swap:
Exchange the values of its arguments.
Use it in fast-import.c
Also fix spacing issues in strbuf.h
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Now that cmd_data acts on a strbuf, make last_object stashed buffer be a
strbuf as well. On new stash, don't free the last stashed buffer, rather
swap it with the one you will stash, this way, callers of store_object can
act on static strbufs, and at some point, fast-import won't allocate new
memory for objects buffers.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
read_line is now strbuf_getline, and is a first class citizen, it returns 0
when reading a line worked, EOF else.
The ->eof marker was used non-locally by fast-import.c, mimic the same
behaviour using a static int in "read_next_command", that now returns -1 on
EOF, and avoids to call strbuf_getline when it's in EOF state.
Also no longer automagically strbuf_release the buffer, it's counter
intuitive and breaks fast-import in a very subtle way.
Note: being at EOF implies that command_buf.len == 0.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Add strbuf_rtrim to remove trailing spaces.
* Add strbuf_insert to insert data at a given position.
* Off-by one fix in strbuf_addf: strbuf_avail() does not counts the final
\0 so the overflow test for snprintf is the strict comparison. This is
not critical as the growth mechanism chosen will always allocate _more_
memory than asked, so the second test will not fail. It's some kind of
miracle though.
* Add size extension hints for strbuf_init and strbuf_read. If 0, default
applies, else:
+ initial buffer has the given size for strbuf_init.
+ first growth checks it has at least this size rather than the
default 8192.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This patch features the use of strbuf_detach, and prevent the programmer
to mess with allocation directly. The code is as efficent as before, just
more concise and more straightforward.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The gory details are explained in strbuf.h. The change of semantics this
patch enforces is that the embeded buffer has always a '\0' character after
its last byte, to always make it a C-string. The offs-by-one changes are all
related to that very change.
A strbuf can be used to store byte arrays, or as an extended string
library. The `buf' member can be passed to any C legacy string function,
because strbuf operations always ensure there is a terminating \0 at the end
of the buffer, not accounted in the `len' field of the structure.
A strbuf can be used to generate a string/buffer whose final size is not
really known, and then "strbuf_detach" can be used to get the built buffer,
and keep the wrapping "strbuf" structure usable for further work again.
Other interesting feature: strbuf_grow(sb, size) ensure that there is
enough allocated space in `sb' to put `size' new octets of data in the
buffer. It helps avoiding reallocating data for nothing when the problem the
strbuf helps to solve has a known typical size.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
[sp: minor change to use fputs, thus reducing the patch size]
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* skip_optional_lf() decl is old-style -- please say
static skip_optional_lf(void)
{
...
}
* t9300 #14 fails, like this:
* expecting failure: git-fast-import <input
fatal: Branch name doesn't conform to GIT standards: .badbranchname
fast-import: dumping crash report to .git/fast_import_crash_14354
./test-lib.sh: line 143: 14354 Segmentation fault git-fast-import <input
-- >8 --
Subject: [PATCH] fastimport: Fix re-use of va_list
The va_list is designed to be used only once. The current code
reuses va_list argument may cause segmentation fault. Copy and
release the arguments to avoid this problem.
While we are at it, fix old-style function declaration of
skip_optional_lf().
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When we crash the frontend developer (or end-user) may need to know
roughly around what part of the input stream we had a problem with
and aborted on. Because line numbers aren't very useful in this
sort of application we instead just keep the last 100 commands in
a FIFO queue and print them as part of the crash report.
Currently one problem with this design is a commit that has
more than 100 modified files in it will flood the FIFO and any
context regarding branch/from/committer/mark/comments will be lost.
We really should save only the last few (10?) file changes for the
current commit, ensuring we have some prior higher level commands
in the FIFO when we crash on a file M/D/C/R command.
Another issue with this approach is the FIFO only includes the
commands, it does not include the commit messages. Yet having a
commit message may be useful to help locate the relevant change in
the source material. In practice I don't think this is going to be a
major concern as the frontend can always embed its own source change
set identifier as a comment (which will appear in the crash report)
and the commit message(s) for the most recent commits of any given
branch should be obtainable from the (packed) commit objects.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
As fast-import is quite strict about its input and die()'s anytime
something goes wrong it can be difficult for a frontend developer
to troubleshoot why fast-import rejected their input, or to even
determine what input command it rejected.
This change introduces a custom handler for Git's die() routine.
When we receive a die() for any reason (fast-import or a lower level
core Git routine we called) the error is first dumped onto stderr
and then a more extensive crash report file is prepared in GIT_DIR.
Finally we exit the process with status 128, just like the stock
builtin die handler.
An internal flag is set to prevent any further die()'s that may be
invoked during the crash report generator from causing us to enter
into an infinite loop. We shouldn't die() from our crash report
handler, but just in case someone makes a future code change we are
prepared to gaurd against small mistakes turning into huge problems
for the end-user.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The existing checkpoint command is very useful to force fast-import
to dump the branches out to disk so that standard Git tools can
access them and the objects they refer to. However there was not a
way to know when fast-import had finished executing the checkpoint
and it was safe to read those refs.
The progress command can be used to make fast-import output any
message of the frontend's choosing to standard out. The frontend
can scan for these messages using select() or poll() to monitor a
pipe connected to the standard output of fast-import.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
For the same reasons as the prior change we want to allow frontends
to omit the trailing LF that usually delimits commands. In some
cases these just make the input stream more verbose looking than
it needs to be, and its just simpler for the frontend developer to
get started if our parser is slightly more lenient about where an
LF is required and where it isn't.
To make this optional LF feature work we now have to buffer up to one
line of input in command_buf. This buffering can happen if we look
at the current input command but don't recognize it at this point
in the code. In such a case we need to "unget" the entire line,
but we cannot depend upon the stdio library to let us do ungetc()
for that many characters at once.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
A few fast-import frontend developers have found it odd that we
require the LF following a `data` command, especially in the exact
byte count format. Technically we don't need this LF to parse
the stream properly, but having it here does make the stream more
readable to humans. We can easily make the LF optional by peeking
at the next byte available from the stream and pushing it back into
the buffer if its not LF.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Several frontend developers have asked that some form of stream
comments be permitted within a fast-import data stream. This way
they can include information from their own frontend program about
where specific data was taken from in the source system, or about
a decision that their frontend may have made while creating the
fast-import data stream.
This change introduces comments in the Bourne-shell/Tcl/Perl style.
Lines starting with '#' are ignored, up to and including the LF.
Unlike the above mentioned three languages however we do not look for
and ignore leading whitespace. This just simplifies the definition
of the comment format and the code that parses them.
To make comments work we had to stop using read_next_command() within
cmd_data() and directly invoke read_line() during the inline variant
of the function. This is necessary to retain any lines of the
input data that might otherwise look like a comment to fast-import.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Instead of growing our buffer by hand during the inline variant of
cmd_data() we can save a few lines of code and just use the nifty
new ALLOC_GROW macro already available to us.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Michael Haggerty <mhagger@alum.mit.edu> noticed while debugging a
Git backend for cvs2svn that fast-import was barfing when he tried
to use "TAG_FIXUP" as a branch name for temporary work needed to
cleanup the tree prior to creating an annotated tag object.
The reason we were rejecting the branch name was check_ref_format()
returns -2 when there are less than 2 '/' characters in the input
name. TAG_FIXUP has 0 '/' characters, but is technically just as
valid of a ref as HEAD and MERGE_HEAD, so we really should permit it
(and any other similar looking name) during import.
New test cases have been added to make sure we still detect very
wrong branch names (e.g. containing [ or starting with .) and yet
still permit reasonable names (e.g. TAG_FIXUP).
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Something probably assumed that HT indentation is 4 characters.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
xmkstemp() performs error checking and prints a standard error message when
an error occur.
Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Some source material (e.g. Subversion dump files) perform directory
renames by telling us the directory was copied, then deleted in the
same revision. This makes it difficult for a frontend to convert
such data formats to a fast-import stream, as all the frontend has
on hand is "Copy a/ to b/; Delete a/" with no details about what
files are in a/, unless the frontend also kept track of all files.
The new 'C' subcommand within a commit allows the frontend to make a
recursive copy of one path to another path within the branch, without
needing to keep track of the individual file paths. The metadata
copy is performed in memory efficiently, but is implemented as a
copy-immediately operation, rather than copy-on-write.
With this new 'C' subcommand frontends could obviously implement an
'R' (rename) on their own as a combination of 'C' and 'D' (delete),
but since we have already offered up 'R' in the past and it is a
trivial thing to keep implemented I'm not going to deprecate it.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some source material (e.g. Subversion dump files) perform directory
renames without telling us exactly which files in that subdirectory
were moved. This makes it hard for a frontend to convert such data
formats to a fast-import stream, as all the frontend has on hand
is "Rename a/ to b/" with no details about what files are in a/,
unless the frontend also kept track of all files.
The new 'R' subcommand within a commit allows the frontend to
rename either a file or an entire subdirectory, without needing to
know the object's SHA-1 or the specific files contained within it.
The rename is performed as efficiently as possible internally,
making it cheaper than a 'D'/'M' pair for a file rename.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When e8438420bb allowed us to reload
the marks table on subsequent runs of fast-import we really broke
things, as we set pack_id to MAX_PACK_ID for any objects we imported
into the marks table. Creating a branch from that mark should fail
as we attempt to read the object through a non-existant packed_git
pointer. Instead we have to use the normal Git object system to
locate the older commit, as we ourselves do not have a reference
to the packed_git it resides in.
This bug only occurred because t9300 was not complete enough.
When we added the --import-marks feature we didn't actually test
its implementation enough to verify the function worked as intended.
I have corrected that, and included the changes as part of this fix.
Prior versions of fast-import fail the new test(s); this commit
allows them to pass.
Credit for this bug find goes to Simon Hausmann <simon@lst.de> as
he recently identified a similiar bug in the tree lazy-loading path.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
To resolve a corner case uncovered by Simon Hausmann I need to
reuse the logic for the SHA-1 expression version of the 'from '
command within the mark version of the 'from ' command. This change
doesn't alter any functionality, but is merely breaking the common
code out to a function that I can reuse.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Commit a5c1780a03 sets the pack_id of existing
objects to MAX_PACK_ID. When the same object is referenced later again it is
found in the local object hash. With such a pack_id fast-import should not try
to locate that object in the newly created pack(s).
Signed-off-by: Simon Hausmann <simon@lst.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Fix uninitialized last_object->no_free variable that is accessed in
store_object.
Signed-off-by: Simon Hausmann <simon@lst.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
git-checkout is also adapted to make use of this new option
instead of the handcrafted command sequence.
Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Include a generalized fixup_pack_header_footer() in this new file.
Needed by git-repack --max-pack-size feature in a later patchset.
[sp: Moved close(pack_fd) to callers, to support index-pack, and
changed name to better indicate it is for packfiles.]
Signed-off-by: Dana L. How <danahow@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* maint:
http.c: Fix problem with repeated calls of http_init
Add missing reference to GIT_COMMITTER_DATE in git-commit-tree documentation
Fix import-tars fix.
Update .mailmap with "Michael"
Do not barf on too long action description
Catch empty pathnames in trees during fsck
Don't allow empty pathnames in fast-import
import-tars: be nice to wrong directory modes
git-svn: Added 'find-rev' command
git shortlog documentation: add long options and fix a typo
riddochc on #git noticed corruption caused by import-tars. This
was fixed in the prior commit by Dscho, but fast-import was wrong
to have allowed a tree to be created with an empty string as the
filename. No operating system allows this, and Git itself doesn't
accept this into the index.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some users of fast-import have been trying to use it to rewrite
commits and trees, an activity where the all of the relevant blobs
are already available from the existing packfiles. In such a case
we don't want to repack a blob, even if the frontend application
has supplied us the raw data rather than a mark or a SHA-1 name.
I'm intentionally only checking the packfiles that existed when
fast-import started and am always ignoring all loose object files.
We ignore loose objects because fast-import tends to operate on a
very large number of objects in a very short timespan, and it is
usually creating new objects, not reusing existing ones. In such
a situtation the majority of the objects will not be found in the
existing packfiles, nor will they be loose object files. If the
frontend application really wants us to look at loose object files,
then they can just repack the repository before running fast-import.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This fixes a problem reported by Randal Schwartz:
>I finally tracked down all the (albeit inconsequential) errors I was getting
>on both OpenBSD and OSX. It's the warn() function in usage.c. There's
>warn(3) in BSD-style distros. It'd take a "great rename" to change it, but if
>someone with better C skills than I have could do that, my linker and I would
>appreciate it.
It was annoying to me, too, when I was doing some mergetool testing on
Mac OS X, so here's a fix.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: "Randal L. Schwartz" <merlyn@stonehenge.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
When some operations are interrupted (or "die()'d" or crashed) then the
partial object/pack/index file may remain around. Make it more obvious
in their name that those files are temporary stuff and can be cleaned up
if no operation is in progress.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Jeff King pointed out that these casts are quite unnecessary, as
the compiler should be doing them anyway, and may cause problems
in the future if the size of the argument for to_atom were to ever
be increased.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When building up a tree for a commit, fast-import
dynamically allocates memory for the tree entries. When more
space is needed, the allocated memory is increased by a
constant amount. For very large trees, this means
re-allocating and memcpy()ing the memory O(n) times.
To compound this problem, releasing the previous tree
resource does not free the memory; it is kept in a pool
for future trees. This means that each of the O(n)
allocations will consume increasing amounts of memory,
giving O(n^2) memory consumption.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* 'master' of git://repo.or.cz/git/fastimport:
Allow fast-import frontends to reload the marks table
Use atomic updates to the fast-import mark file
Preallocate memory earlier in fast-import
I'm giving fast-import a lesson on how to reload the marks table
using the same format it outputs with --export-marks. This way
a frontend can reload the marks table from a prior import, making
incremental imports less painful.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When we allow fast-import frontends to reload a mark file from a
prior session we want to let them use the same file as they exported
the marks to. This makes it very simple for the frontend to save
state across incremental imports.
But we don't want to lose the old marks table if anything goes wrong
while writing our current marks table. So instead of truncating and
overwriting the path specified to --export-marks we use the standard
lockfile code to write the current marks out to a temporary file,
then rename it over the old marks table.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
I'm about to teach fast-import how to reload the marks file created
by a prior session. The general approach that I want to use is to
immediately parse the marks file when the specific argument is found
in argv, thereby allowing the caller to supply multiple marks files,
as the mark space can be sparsely populated.
To make that work out we need to allocate our object tables before
we parse the command line options. Since none of these tables
depend on the command line options, we can easily relocate them.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Always use an off_t value in pack-objects anytime we are dealing
with an offset to some data within a packfile.
Also fixed a minor uintmax_t that was incorrectly defined before.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Not all platforms have declared 'unsigned long' to be a 64 bit value,
but we want to support a 64 bit packfile (or close enough anyway)
in the near future as some projects are getting large enough that
their packed size exceeds 4 GiB.
By using off_t, the POSIX type that is declared to mean an offset
within a file, we support whatever maximum file size the underlying
operating system will handle. For most modern systems this is up
around 2^60 or higher.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
We shouldn't attempt to assign constant strings into char*, as the
string is not writable at runtime. Likewise we should always be
treating unsigned values as unsigned values, not as signed values.
Most of these are very straightforward. The only exception is the
(unnecessary) xstrdup/free in builtin-branch.c for the detached
head case. Since this is a user-level interactive type program
and that particular code path is executed no more than once, I feel
that the extra xstrdup call is well worth the easy elimination of
this warning.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
* maint:
fast-import: Fail if a non-existant commit is used for merge
fast-import: Avoid infinite loop after reset
[sp: Minor evil merge to deal with type_names array moving
to be private in 'master'.]
Johannes Sixt noticed during one of his own imports that fast-import
did not fail if a non-existant commit is referenced by SHA-1 value
as an argument to the 'merge' command. This allowed the user to
unknowingly create commits that would fail in fsck, as the commit
contents would not be completely reachable.
A side effect of this bug was that a frontend process could mark
any SHA-1 object (blob, tree, tag) as a parent of a merge commit.
This should also fail in fsck, as the commit is not a valid commit.
We now use the same rule as the 'from' command. If a commit is
referenced in the 'merge' command by hex formatted SHA-1 then the
SHA-1 must be a commit or a tag that can be peeled back to a commit,
the commit must already exist, and must be readable by the core Git
infrastructure code. This requirement means that the commit must
have existed prior to fast-import starting, or the commit must have
been flushed out by a prior 'checkpoint' command.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Johannes Sixt noticed that a 'reset' command applied to a branch that
is already active in the branch LRU cache can cause fast-import to
relink the same branch into the LRU cache twice. This will cause
the LRU cache to contain a cycle, making unload_one_branch run in an
infinite loop as it tries to select the oldest branch for eviction.
I have trivially fixed the problem by adding an active bit to
each branch object; this bit indicates if the branch is already
in the LRU and allows us to avoid trying to add it a second time.
Converting the pack_id field into a bitfield makes this change take
up no additional memory.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We currently have two parallel notation for dealing with object types
in the code: a string and a numerical value. One of them is obviously
redundent, and the most used one requires more stack space and a bunch
of strcmp() all over the place.
This is an initial step for the removal of the version using a char array
found in object reading code paths. The patch is unfortunately large but
there is no sane way to split it in smaller parts without breaking the
system.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Sometime typename() is used, sometimes type_names[] is accessed directly.
Let's enforce typename() all the time which allows for validating the
type.
Also let's add a function to go from a name to a type and use it instead
of manual memcpy() when appropriate.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Previous step converted use of strncmp() with literal string
mechanically even when the result is only used as a boolean:
if (!strncmp("foo", arg, 3)) ==> if (!(-prefixcmp(arg, "foo")))
This step manually cleans them up to read:
if (!prefixcmp(arg, "foo"))
Signed-off-by: Junio C Hamano <junkio@cox.net>
This mechanically converts strncmp() to use prefixcmp(), but only when
the parameters match specific patterns, so that they can be verified
easily. Leftover from this will be fixed in a separate step, including
idiotic conversions like
if (!strncmp("foo", arg, 3))
=>
if (!(-prefixcmp(arg, "foo")))
This was done by using this script in px.perl
#!/usr/bin/perl -i.bak -p
if (/strncmp\(([^,]+), "([^\\"]*)", (\d+)\)/ && (length($2) == $3)) {
s|strncmp\(([^,]+), "([^\\"]*)", (\d+)\)|prefixcmp($1, "$2")|;
}
if (/strncmp\("([^\\"]*)", ([^,]+), (\d+)\)/ && (length($1) == $3)) {
s|strncmp\("([^\\"]*)", ([^,]+), (\d+)\)|(-prefixcmp($2, "$1"))|;
}
and running:
$ git grep -l strncmp -- '*.c' | xargs perl px.perl
Signed-off-by: Junio C Hamano <junkio@cox.net>
Thanks to Simon 'corecode' Schubert <corecode@fs.ei.tum.de> for
the clean-up. Defining the C99 standard PRIuMAX when necessary
replaces UM_FMT and the awkward UM10_FMT. There are no direct
C99 translations for other uses of NO_C99_FORMAT in git, alas.
Signed-off-by: Jason Riedy <ejr@cs.berkeley.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Define UM_FMT and UM10_FMT and use in place of %ju and %10ju,
respectively. Both format as unsigned long long, so this
assumes the compiler supports long long.
Signed-off-by: Jason Riedy <jason@acm.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
It was suggested on the mailing list that being able to use `from`
in any commit to reset the current branch is useful in some types of
importers, such as a darcs importer.
We originally did not permit resetting an existing branch with a
new `from` command during a `commit` command, but this restriction
was only to help debug the hacked up cvs2svn that Jon Smirl was
developing in parallel with git-fast-import. It is probably more
of a problem to disallow it than to allow it. So now we permit a
`from` during any `commit`.
While making the changes required to permit multiple `from`
commands on the same branch, I discovered we no longer needed the
last_commit field to be set to 0 during a reset, so that was removed.
(Reset was originally setting the field to 0 to signal cmd_from()
that it was OK to execute on the branch.)
While poking around in this section of fast-import I also realized
the `reset` command was not working as intended if the corresponding
`from` command was omitted (as allowed by the BNF grammar and the
code). If `from` was omitted we cleared out the tree but we left
the tree SHA-1 and parent commit SHA-1 intact. This is not what
the user intended in this case. Instead they would be trying to
reset the branch to have no parent and to have no tree, making the
branch look new-born during the next commit. We now clear these
SHA-1 values during `reset`, ensuring the branch looks new-born if
`from` does not get supplied.
New test cases for these were also added.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Most users don't need the pack boundary information that fast-import
was printing to standard output, especially if they were calling
it with --quiet.
Those users who do want this information probably want it captured
so they can go back and use it to repack the imported repository.
So dumping the boundary commits to a log file makes more sense then
printing them to standard output.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Not on all platforms are size_t and unsigned long equivalent.
Since I do not know how portable %z is, I play safe, and just
cast the respective variables to unsigned long.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Apparently fast-import used to die a horrible death if we
were unable to open the marks file for output. This is
slightly less than ideal, especially now that we dump
the marks as part of the `checkpoint` command.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If the frontend asks us to checkpoint (via the explicit checkpoint
command) its probably because they are afraid the current import
will crash/fail/whatever and want to make sure they can pickup from
the last checkpoint. To do that sort of recovery, we will need the
current tip of every branch and tag available at the next startup.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Often users will be running fast-import from within a larger frontend
process, and this may be a frequent periodic tool such as a future
edition of `git-svn fetch`. We don't want to bombard users with our
large stats output if they won't be interested in it, so `--quiet`
is now an option to make gfi be more silent.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some frontends may not be able to (easily) keep track of which files
are included in the branch, and which aren't. Performing this
tracking can be tedious and error prone for the frontend to do,
especially if its foreign data source cannot supply the changed
path list on a per-commit basis.
fast-import now allows a frontend to request that a branch's tree
be wiped clean (reset to the empty tree) at the start of a commit,
allowing the frontend to feed in all paths which belong on the branch.
This is ideal for a tar-file importer frontend, for example, as
the frontend just needs to reformat the tar data stream into a gfi
data stream, which may be something a few Perl regexps can take
care of. :)
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If fast-import is being used to update an existing branch of
a repository, the user may not want to lose commits if another
process updates the same ref at the same time. For example, the
user might be using fast-import to make just one or two commits
against a live branch.
We now perform a fast-forward check during the ref updating process.
If updating a branch would cause commits in that branch to be lost,
we skip over it and display the new SHA1 to standard error.
This new default behavior can be overridden with `--force`, like
git-push and git-fetch.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Since some frontends may be working with source material where
the dates are only readily available as RFC 2822 strings, it is
more friendly if fast-import exposes Git's parse_date() function
to handle the conversion. This way the frontend doesn't need
to perform the parsing itself.
The new --date-format option to fast-import can be used by a
frontend to select which format it will supply date strings in.
The default is the standard `raw` Git format, which fast-import
has always supported. Format rfc2822 can be used to activate the
parse_date() function instead.
Because fast-import could also be useful for creating new, current
commits, the format `now` is also supported to generate the current
system timestamp. The implementation of `now` is a trivial call
to datestamp(), but is actually a whole whopping 3 lines so that
fast-import can verify the frontend really meant `now`.
As part of this change I have added validation of the `raw` date
format. Prior to this change fast-import would accept anything
in a `committer` command, even if it was seriously malformed.
Now fast-import requires the '> ' near the end of the string and
verifies the timestamp is formatted properly.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
There is no need to check for a NULL pointer before invoking free(),
the runtime library automatically performs this check anyway and
does nothing if a NULL pointer is supplied.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Junio noticed that I was using a different style in fast-import
for returned pointers than the rest of Git. Before merging this
code into the main git.git tree I'd like to make it consistent,
as this style variation was not intentional.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Junio noticed these warnings/errors in fast-import when compiling
with `-Werror -ansi -pedantic`. A few changes are to reduce compiler
warnings, while one (in cmd_merge) is a bug fix.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The --branch-log option and its associated code hasn't been used in
several months, as its not really very useful for debugging fast-import
or a frontend. I don't plan on supporting it in this state long-term,
so I'm killing it now before it gets distributed to a wider audience.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The current implementation of shell-style quoted refnames and
SHA-1 expressions within fast-import contains a bad memory leak.
We leak the unquoted strings used by the `from` and `merge`
commands, maybe others. Its also just muddling up the docs.
Since Git refnames cannot contain LF, and that is our delimiter
for the end of the refname, and we accept any other character
as-is, there is no reason for these strings to support quoting,
except to be nice to frontends. But frontends shouldn't be
expecting to use funny refs in Git, and its just as simple to
never quote them as it is to always pass them through the same
quoting filter as pathnames. So frontends should never quote
refs, or ref expressions.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some structs are allocated rather frequently, but were using integer
types which were far larger than required to actually store their
full value range.
As packfiles are limited to 4 GiB we don't need more than 32 bits to
store the offset of an object within that packfile, an `unsigned long`
on a 64 bit system is likely a 64 bit unsigned value. Saving 4 bytes
per object on a 64 bit system can add up fast on any sizable import.
As atom strings are strictly single components in a path name these
are probably limited to just 255 bytes by the underlying OS. Going
to that short of a string is probably too restrictive, but certainly
`unsigned int` is far too large for their lengths. `unsigned short`
is a reasonable limit.
Modes within a tree really only need two bytes to store their whole
value; using `unsigned int` here is vast overkill. Saving 4 bytes
per file entry in an active branch can add up quickly on a project
with a large number of files.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This command isn't encouraged (as its slow) but it does exist and
is accepted, so it still should be covered in the BNF.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
git-fast-import requires use of inttypes.h, but the master branch has
added it to git-compat-util differently than git-fast-import originally
had used it. This merge back of master to the fast-import topic is to
get (and use) inttypes.h the way master is using it.
This is a partially evil merge to remove the call to setup_ident(),
as the master branch now contains a change which makes this implicit
and therefore removed the function declaration. (commit 01754769).
Conflicts:
git-compat-util.h
Its very annoying to need to specify the file content ahead of a
commit and use marks to connect the individual blobs to the commit's
file modification entry, especially if the frontend can't/won't
generate the blob SHA1s itself. Instead it would much easier to
use if we can accept the blob data at the same time as we receive
each file_change line.
Now fast-import accepts 'inline' instead of a mark idnum or blob
SHA1 within the 'M' type file_change command. If an inline is
detected the very next line must be a 'data n' command, supplying
the file data.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
During testing its nice to not have to feed the length of a data
chunk to the 'data' command of fast-import. Instead we would
prefer to be able to establish a data chunk much like shell's <<
operator and use a line delimiter to denote the end of the input.
So now if a data command is started as 'data <<EOF' we will look
for a terminator line containing only the string EOF on that line.
Once found, we stop the data command. Everything between the two
lines is used as the data value.
The 'data <<' syntax is slower than 'data n', as we don't know how
many bytes to expect and instead must grow our buffer on the fly.
It also has the problem that the frontend must use a string which
will not appear on a line by itself in the input, and the data
region will always end in an LF. For these reasons real import
frontends are encouraged to continue to use _only_ 'data n'.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The --objects command line option is rather unnecessary. Internally
we allocate objects in 5000 unit blocks, ensuring that any sort
of malloc overhead is ammortized over the individual objects to
almost nothing. Since most frontends don't know how many objects
they will need for a given import run (and its hard for them to
predict without just doing the run) we probably won't see anyone
using --objects. Further since there's really no major benefit
to using the option, most frontends won't even bother supplying
it even if they could estimate the number of objects. So I'm
removing it.
The --max-objects-per-pack option was probably a mistake to even
have added in the first place. The packfile format is limited
to 4 GiB today; given that objects need at least 3 bytes of data
(and probably need even more) there's no way we are going to exceed
the limit of 1<<32-1 objects before we reach the file size limit.
So I'm removing it (to slightly reduce the complexity of the code)
before anyone gets any wise ideas and tries to use it.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Currently the pack .idx file format uses 32-bit unsigned integers
for the fan-out table and the object offsets. We had previously
defined these as 'unsigned int', but not every system will define
that type to be a 32 bit value. To ensure maximum portability we
should always use 'uint32_t'.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Previously we were using 'unsigned int' to update the hdr_entries
field of the pack header after the file had been completed and
was being hashed. This may not be 32 bits on all platforms.
Instead we want to always uint32_t.
I'm actually cheating here by just using the pack_header like the
rest of Git and letting the struct definition declare the correct
type. Right now that field is still 'unsigned int' (wrong) but a
pending change submitted by Simon 'corecode' Schubert changes it
to uint32_t. After that change is merged in fast-import will do
the right thing all of the time.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Branches are only contained by a packfile if the branch actually
had its most recent commit in that packfile. So new branches are
set to MAX_PACK_ID to ensure they don't cause their commit to list
as part of the first packfile when it closes out if the commit was
actually in existance before fast-import started.
Also corrected the type of last_commit to be umaxint_t to prevent
overflow and wraparound on very large imports. Though that is
highly unlikely to occur as we're talking 4 billion commits, which
no real project has right now.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Apparently the git convention is to declare any function which
takes no arguments as taking void. I did not do this during the
early fast-import development, but should have.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The length of an atom string cannot be negative. So make it
explicit and declare it as an unsigned value.
The shift width in a mark table node also cannot be negative.
I'm also moving it to after the pointer arrays to prevent any
possible alignment problems on a 64 bit system.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Now that fast-import uses uintmax_t (the largest available unsigned
integer type) for marks we don't want to say its an unsigned 32
bit integer in ASCII base 10 notation. It could be much larger,
especially on 64 bit systems, and especially if a frontend uses
a very large number of marks (1 per file revision on a very, very
large import).
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
To help callers repack very large repositories into a series of
packfiles fast-import now outputs the last commits/tags it wrote to
a packfile when it prints out the packfile name. This information
can be feed to pack-objects --revs to repack. For the first pack
of an initial import this is pretty easy (just feed those SHA1s on
stdin) but for subsequent packs you want to feed the subsequent
pack's final SHA1s but also all prior pack's SHA1s prefixed with
the negation operator. This way the prior pack's data does not
get included into the subsequent pack.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Since object_count is limited to 'unsigned long' (really an
unsigned 32 bit integer value) by the pack file format we may as
well use exactly that type here in fast-import for that counter.
An earlier change by me incorrectly made it uintmax_t.
But since object_count is a counter for the current packfile only,
we don't want to output its value at the end. Instead we should
sum up the individual type counters and report that total, as that
will cover all of the packfiles.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Apparently amd64 has defined 'unsigned long' to be a 64 bit value,
which means -1 was way over the 4 GiB packfile limit. Whoops.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Much like the pack_sha1 the pack_fd is an unnecessary global
variable, we already have the fd stored in our struct packed_git
*pack_data so that the core library functions in sha1_file.c are
able to lookup and decompress object data that we have previously
written. Keeping an extra copy of this value in our own variable
is just a hold-over from earlier versions of fast-import and is
now completely unnecessary.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Because we are renaming the packfile into its file destination we
need to be sure its not open when the rename is called, otherwise
some operating systems (e.g. Windows) may prevent the rename from
occurring.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Because fast-import automatically updates all references (heads
and tags) at the end of its run the repository is corrupt unless
the objects are available in the .git/objects/pack directory prior
to the refs being modified. The easiest way to ensure that is true
is to move the packfile and its associated index directly into the
.git/objects/pack directory as soon as we have finished output to it.
But the only safe way to do this is to create the a temporary .keep
file for that pack, so we use the same tricks that index-pack uses
when its being invoked by receive-pack.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Rather than maintaing our own packfile level sha1 variable we
can make use of the one already available in struct packed_git.
Its meant for the SHA1 of the index but it can also hold the
SHA1 of the packfile itself between final checksumming of the
packfile and creation of the index.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Prior to git having read_in_full() fast-import used its own private
function yread to perform the header reading task. No sense in
keeping that around now that read_in_full is a public, stable
function.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If a frontend wants to use a mark per file revision and per commit
and is doing a truly huge import (such as a 32 GiB SVN repository)
we may need more than 2**32 unique mark values, especially if the
frontend is unable (or unwilling) to recycle mark values. For mark
idnums we should use the largest unsigned integer type available,
hoping that will be at least 64 bits when we are compiled as a 64
bit executable. This way we may consume huge amounts of memory
storing our mark table, but we'll at least be able to process
the entire import without failing.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If we previously were using a delta but we needed to checkpoint the
current packfile and switch to a new packfile we need to throw away
the delta and compress the raw object by itself, as delta chains
cannot span non-thin packfiles. Unfortunately the output buffer
in this case needs to grow, as the size of the compressed object
may be quite a bit larger than the size of the compressed delta.
I've also avoided recompressing the object if we are checkpointing
and we didn't use a delta. In this case the output buffer is the
correct size and has already been populated with the right data,
we just need to close out the current packfile and open a new one.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Caller scripts may want to know what packfiles the fast-import
process just wrote out for them. This is now output to stdout,
one packfile name per line, after we checkpoint each packfile.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When the number of objects or number of bytes gets close to the limit
allowed by the packfile format (or configured on the command line by
our caller) we should automatically checkpoint the current packfile
and start a new one before writing the object out. This does however
require that we abandon the delta (if we had one) as its not valid
in a new packfile.
I also added the simple rule that if we got a delta back but the
delta itself is the same size as or larger than the uncompressed
object to ignore the delta and just store the object data. This
should avoid some really bad behavior caused by our current delta
strategy.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When we are generating multiple packfiles at once we only need
to scan the blocks of object_entry structs which contain objects
for the current packfile. Because the most recent blocks are at
the front of the linked list, and because all new objects going
into the current file are allocated from the front of that list,
we can stop scanning for objects as soon as we identify one which
doesn't belong to the current packfile.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If the last packfile is going to be empty (has 0 objects) then it
shouldn't be kept after the import has terminated, as there is no
point to the packfile. So rather than hashing it and making the
index file, just delete the packfile.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
To help importers which are dealing with massive amounts of data
fast-import needs to be able to close the packfile it is currently
writing to and open a new packfile for any additional data that
will be received. A new 'checkpoint' command has been introduced
which can be used by the frontend import process to force this
to occur at any time. This may be useful to ensure a very long
running import doesn't lose any work due to unexpected failures.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
There is little reason to be keeping a global duplicate_count
value when we also keep it per object type. The global counter can
easily be computed at the end, once all processing has completed.
This saves us a couple of machine instructions in an unimportant
part of code. But it looks slightly better to me to not keep
two counters around.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Now that we are starting to see some really large projects (such
as KDE or a fork of FreeBSD) get imported into Git we're running
into the upper limit on packfile object count as well as overall
byte length. The KDE and FreeBSD projects are both likely to
require more than 4 GiB to store their current history, which means
we really need multiple packfiles to handle their content.
This is a fairly simple restructuring of the internal code to help
us support creating multiple packfiles from within fast-import.
We are now adding a 5 digit incrementing suffix to the end of the
basename supplied to us by the caller, permitting up to 99,999
packs to be generated in a single fast-import run.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Now that the sha1_file.c library routines use the sliding mmap
routines to perform efficient access to portions of a packfile
I can remove that code from fast-import.c and just invoke it.
One benefit is we now have reloading support for any packfile which
uses OBJ_OFS_DELTA. Another is we have significantly less code
to maintain.
This code reuse change *requires* that fast-import generate only
an OBJ_OFS_DELTA format packfile, as there is absolutely no index
available to perform OBJ_REF_DELTA lookup in while unpacking
an object. This is probably reasonable to require as the delta
offsets result in smaller packfiles and are faster to unpack,
as no index searching is required. Its also only a temporary
requirement as users could always repack without offsets before
making the import available to older versions of Git.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
I'm bringing master in early so that the OBJ_OFS_DELTA implementation
is available as part of the topic. This way git-fast-import can
learn about this new slightly smaller and faster packfile format,
and can generate them directly rather than needing to have them be
repacked with git-pack-objects.
Due to the API changes in master during the period of development
of git-fast-import, a few minor tweaks to fast-import.c are needed
to produce a working merge. I've done them here as part of the
merge to ensure bisection always works.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some importers may want to create a branch long before they actually
commit to it, or in some cases they may never commit to the branch
but they still need the ref to be created in the repository after
the import is complete.
This extends the 'reset ' command to automatically create a new
branch if the supplied reference isn't already known as a branch.
While I'm at it I also modified the syntax of the reset command
to terminate with an empty line, like commit and tag operate.
This just makes the command set more consistent.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some importers are able to determine when branch merges occurred
within their source data. In these cases they will want to supply
the correct commits to fast-import so that a proper merge commit
will exist in Git. This is now supported by supplying a 'merge '
command after the commit message and optional from command.
A merge is not actually performed by fast-import, its assumed that
the frontend performed any sort of merging activity already and
that fast-import should simply be storing its result.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Apparently we did not copy the blob SHA1 into the stack variable
'sha1' when a mark is used to refer to a prior blob. This code
was not previously tested as the Mozilla CVS -> git-fast-import
program always fed us full SHA1s for modified blobs and did not
use the mark feature there.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The new tree delta implementation caused blob SHA1s to be used
instead of a tree SHA1 when a tree was written out. This really
only appeared to happen when converting an existing file to a tree,
but may have been possible in some other situations.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Since most commits and tag objects are around the same size and we
only generate one at a time we can reuse the same buffer rather than
xmalloc'ing and free'ing the buffer every time we generate a commit.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We only ever generate at most two tree streams at a time. Since most
trees are around the same size we can simply recycle the buffers from
one tree generation to the next rather than constantly xmalloc'ing
and free'ing them. This should perform slightly better when handling
a large number of trees as malloc has less work to do.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
We now store for every tree entry two modes and two sha1 values;
the base (aka "version 0") and the current/new (aka "version 1").
When we generate a tree object we also regenerate the prior version
object and use that as our base object for a delta. This strategy
saves a significant amount of memory as we can continue to use the
atom pool for file/directory names and only increases each tree
entry by an additional 24 bytes of memory.
Branches should automatically delta against their ancestor tree,
unless the ancestor tree is already at the delta chain limit.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Sometimes an import frontend may need to work with a temporary branch
which will actually contain many different branches over the life
of the import. This is especially useful when the frontend needs
to create a tag from a set of file versions which are otherwise
never a commit.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When generating a very large pack file (for example close to 1 GB
in size) it may be impossible for the kernel to find a contiguous
free range within a 32 bit address space for the mapping to be
located at. This is especially problematic on large imports where
there is a lot of malloc activity occuring within the same process
and the malloc'd regions may straddle the previously mapped regions,
thereby creating large holes in the address space.
So instead we map only 128 MB of the pack at any given time.
This will likely increase the number of times the file gets mapped
(with additional system time required to update the page tables
more frequently) but will allow the program to handle packs up to
4 GB in size.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
fast-import was encounting a GPF when it ran out of free tree_entry
objects but didn't know this was the cause because the last
tree_entry wasn't terminated with a NULL pointer. The missing NULL
pointer occurred when we allocated additional entries via xmalloc
but didn't set the last tree_entry's "next" pointer to NULL.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This option can be used to have a record of every commit, the mark
(if supplied) and branch name of the commit recorded into a log file
when the commit is generated. This log can be useful to verify the
results of an import as the commits can be compared to some source
repository matching commits through the mark value.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The marks table can be used by the frontend to load any commit after
the import and compare it to whatever data the frontend knows about
that commit. If the mark idnums can be easily correlated to some
reference source then its relatively trivial to compare the GIT
tree to the reference to verify the accuracy of the import.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
cvs2svn has three phases: begin_commit, middle_commit, end_commit.
The ancester is computed in the middle_commit phase. So its easier
to generate a stream if the from command appears after the commit
message itself but before the file change commands.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Jon Smirl was finding it difficult to alter cvs2svn to generate
branch commands prior to the first commit of the same branch.
This change moves the 'from' command to be an optional parameter of
the 'commit' command, thereby allowing a new branch to be defined
at the moment it gets used to create the first commit on that branch.
This change makes it impossible to create a branch with no commits
on it as at least one commit is needed to register the branch.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some architectures (e.g. SPARC) would require that we access pointers
only on pointer-sized alignments. So ensure the pool allocator
rounds out non-pointer sized allocations to the next pointer so we
don't generate bad memory addresses. This could have occurred if
we had previously allocated an atom whose string was not a whole
multiple of the pointer size, for example.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Tree reloading allows fast-import to swap out the least-recently used
branch by simply deallocating the data structures from memory that
were associated with that branch. Later if the branch becomes active
again it can lazily recreate those structures on demand by reloading
the necessary trees from the pack file it originally wrote them to.
The reloading process is implemented by mmap'ing the pack into
memory and using a much tighter variant of the pack reading code
contained in sha1_file.c. This was a blatent copy from sha1_file.c
but the unpacking functions were significantly simplified and are
actually now in a form that should make it easier to map only the
necessary regions of a pack rather than the entire file.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Tags received from the frontend are generated in memory in a simple
linked list in the order that the tag commands were sent by the
frontend. If multiple different tag objects for the same tag name
get generated the last one sent by the frontend will be the one
that gets written out at termination. Multiple tag objects for
the same name will cause all older tags of the same name to be lost.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If the branch load count exceeds the number of branches created then
the frontend is causing fast-import to page branches into and out of
memory due to the way its ordering its commits. Performance can
likely be increased if the frontend were to alter its commit
sequence such that it stays on one branch before switching to another
branch, then never returns to the prior branch.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Marks are now saved when the mark directive gets used by the frontend
and may be used in place of a SHA1 expression to locate a previous
SHA1 which fast-import may have generated. This is particularly
useful with commits where the frontend does not (easily) have the
ability to compute the SHA1 for an arbitrary commit but needs it
to generate a branch or tag from that commit.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The following command line options are now accepted before the
pack name:
--objects=n # replaces the object count after the pack name
--depth=n # delta chain depth to use (default is 10)
--active-branches=n # maximum number of branches to keep in memory
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Growing a tree caused all subtrees to be deallocated and put back
into the free list yet those subtree's contents were still actively
in use. Consequently they were doled out again and got stomped
on elsewhere. Releasing a tree is now performed in two parts,
either releasing only the content array or releasing the content
array and recursively releasing the subtree(s).
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
If a frontend is smart enough to import a symlink then we should
let them do so. We'll assume that they were smart enough to first
generate a blob to hold the link target, as that's how symlinks
get represented in GIT.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Frontend clients can now send a text stream to fast-import rather
than a binary stream. This should facilitate developing frontend
software as the data stream is easier to view, manipulate and debug
my hand and Mark-I eyeball.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When accepting revision SHA1 IDs from the frontend verify the SHA1
actually refers to a blob and is known to exist. Its an error
to use a SHA1 in a tree if the blob doesn't exist as this would
cause git-fsck-objects to report a missing blob should the pack get
closed without the blob being appended into it or a subsequent pack.
So right now we'll just ask that the frontend "pre-declare" any
blobs it wants to use in a tree before it can use them.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The tree of the current commit can be altered by file_change commands
before the commit gets written to the pack. The file changes are
rather primitive as they simply allow removal of a tree entry or
setting/adding a tree entry.
Currently trees and commits aren't being deltafied when written to
the pack and branch reloading from the current pack doesn't work,
so at most 5 branches can be worked with at any one time.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This provides the basic data structures needed to store trees in
memory while we are processing them for a branch. What we are
attempting to do is track one complete tree for each branch that
the frontend has registered with us through the 'newb' (new_branch)
command. When the frontend edits that tree through 'updf' or 'delf'
commands we'll mark the affected tree(s) as being dirty and recompute
their objects during 'comt' (commit).
Currently the protocol is decidedly _not_ user friendly. I crashed
fast-import by giving it bad input data from Perl. I may try to
improve upon it, or at least upon its error handling.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Moved the new_blob logic off into a new subroutine and
invoked it when getting the 'blob' command.
Added statistics dump to STDERR when the program terminates listing
what it did at a high level. This is somewhat interesting.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Too many globals variables were being used not not enough
code was resuable to process trees and commits so this is
a simple refactoring of the existing blob processing code
to get into a state that will be easier to handle trees
and commits in.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Although its easy to ask the user to tell us how many objects they
will need, its probably better to dynamically grow the object table
in large units. But if the user can give us a hint as to roughly
how many objects then we can still use it during startup.
Also stopped printing the SHA1 strings to stdout as no user is
currently making use of that facility.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
