The promisor.quiet configuration knob can be set to true to make
lazy fetching from promisor remotes silent.
* th/quiet-lazy-fetch-from-promisor:
promisor-remote: add promisor.quiet configuration option
Leakfixes.
* ps/leakfixes:
builtin/mv: fix leaks for submodule gitfile paths
builtin/mv: refactor to use `struct strvec`
builtin/mv duplicate string list memory
builtin/mv: refactor `add_slash()` to always return allocated strings
strvec: add functions to replace and remove strings
submodule: fix leaking memory for submodule entries
commit-reach: fix memory leak in `ahead_behind()`
builtin/credential: clear credential before exit
config: plug various memory leaks
config: clarify memory ownership in `git_config_string()`
builtin/log: stop using globals for format config
builtin/log: stop using globals for log config
convert: refactor code to clarify ownership of check_roundtrip_encoding
diff: refactor code to clarify memory ownership of prefixes
config: clarify memory ownership in `git_config_pathname()`
http: refactor code to clarify memory ownership
checkout: clarify memory ownership in `unique_tracking_name()`
strbuf: fix leak when `appendwholeline()` fails with EOF
transport-helper: fix leaking helper name
When a struct credential expires, credential_fill() clears c->password
so that clients don't try to use it later. However, a struct cred that
uses an alternate authtype won't have a password, but might have a
credential stored in c->credential.
This is a problem, for example, when an OAuth2 bearer token is used. In
the system I'm using, the OAuth2 configuration generates and caches a
bearer token that is valid for an hour. After the token expires, git
needs to call back into the credential helper to use a stored refresh
token to get a new bearer token. But if c->credential is still non-NULL,
git will instead try to use the expired token and fail with an error:
fatal: Authentication failed for 'https://<oauth2-enabled-server>/repository'
And on the server:
[auth_openidc:error] [client <ip>:34012] oidc_proto_validate_exp: "exp" validation failure (1717522989): JWT expired 224 seconds ago
Fix this by clearing both c->password and c->credential for an expired
struct credential. While we're at it, use credential_clear_secrets()
wherever both c->password and c->credential are being cleared.
Update comments in credential.h to mention the new struct fields.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Since 18d8c26930 (test_terminal: redirect child process' stdin to a pty,
2015-08-04), we set up a pty and copy stdin to the child program. But
this ends up being racy; once we send all of the bytes and close the
descriptor, the child program will no longer see a terminal! isatty()
will return 0, and trying to read may return EIO, even if we didn't yet
get all of the bytes.
This was mentioned even in the commit message of 18d8c26930, but we
hacked around it by just sending an infinite input from /dev/zero (in
the intended case, we only cared about isatty(0), not reading actual
input).
And it came up again recently in:
https://lore.kernel.org/git/d42a55b1-1ba9-4cfb-9c3d-98ea4d86da33@gmail.com/
where we tried to actually send bytes, but they don't always all come
through. So this interface is somewhat of an accident waiting to happen;
a caller might not even care about stdin being a tty, but will get bit
by the flaky behavior.
One solution would probably be to avoid closing test_terminal's end of
the pty altogether. But then the other side would never see EOF on its
stdin. That may be OK for some cases, but it's another gotcha that
might cause races or deadlocks, depending on what the child expects to
read.
Let's instead just drop test_terminal's stdin feature completely. Since
the previous commit dropped the two cases from t4153 for which the
feature was originally added, there are no callers left that need it.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
After a patch fails, you can ask "git am" to try applying it again with
new options by running without any of the resume options. E.g.:
git am <patch
# oops, it failed; let's try again
git am --3way
But since this second command has no explicit resume option (like
"--continue"), it looks just like an invocation to read a fresh patch
from stdin. To avoid confusing the two cases, there are some heuristics,
courtesy of 8d18550318 (builtin-am: reject patches when there's a
session in progress, 2015-08-04):
if (in_progress) {
/*
* Catch user error to feed us patches when there is a session
* in progress:
*
* 1. mbox path(s) are provided on the command-line.
* 2. stdin is not a tty: the user is trying to feed us a patch
* from standard input. This is somewhat unreliable -- stdin
* could be /dev/null for example and the caller did not
* intend to feed us a patch but wanted to continue
* unattended.
*/
if (argc || (resume_mode == RESUME_FALSE && !isatty(0)))
die(_("previous rebase directory %s still exists but mbox given."),
state.dir);
if (resume_mode == RESUME_FALSE)
resume_mode = RESUME_APPLY;
[...]
So if no resume command is given, then we require that stdin be a tty,
and otherwise complain about (potentially) receiving an mbox on stdin.
But of course you might not actually have a terminal available! And
sadly there is no explicit way to hit this same code path; this is the
only place that sets RESUME_APPLY. So you're stuck, and scripts like our
test suite have to bend over backwards to create a pseudo-tty.
Let's provide an explicit option to trigger this mode. The code turns
out to be quite simple; just setting "resume_mode" to RESUME_FALSE is
enough to dodge the tty check, and then our state is the same as it
would be with the heuristic case (which we'll continue to allow).
When we don't have a session in progress, there's already code to
complain when resume_mode is set (but we'll add a new test to cover
that).
To test the new option, we'll convert the existing tests that rely on
the fake stdin tty. That lets us test them on more platforms, and will
let us simplify test_terminal a bit in a future patch.
It does, however, mean we're not testing the tty heuristic at all.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In 5ca0c455f1 (ci: fix Python dependency on Ubuntu 24.04, 2024-05-06),
we made the use of Python 2 conditional on whether or not the CI job
runs Ubuntu 20.04. There was a brown-paper-bag-style bug though, where
the condition forgot to invoke the `test` builtin. The result of it is
that the check always fails, and thus all of our jobs run with Python 3
by accident.
Fix this.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Introduce a new command that allows the user to migrate a repository
between ref storage formats. This new command is implemented as part of
a new git-refs(1) executable. This is due to two reasons:
- There is no good place to put the migration logic in existing
commands. git-maintenance(1) felt unwieldy, and git-pack-refs(1) is
not the correct place to put it, either.
- I had it in my mind to create a new low-level command for accessing
refs for quite a while already. git-refs(1) is that command and can
over time grow more functionality relating to refs. This should help
discoverability by consolidating low-level access to refs into a
single executable.
As mentioned in the preceding commit that introduces the ref storage
format migration logic, the new `git refs migrate` command still has a
bunch of restrictions. These restrictions are documented accordingly.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
With the introduction of the new "reftable" backend, users may want to
migrate repositories between the backends without having to recreate the
whole repository. Add the logic to do so.
The implementation is generic and works with arbitrary ref storage
formats so that a backend does not need to implement any migration
logic. It does have a few limitations though:
- We do not migrate repositories with worktrees, because worktrees
have separate ref storages. It makes the overall affair more complex
if we have to migrate multiple storages at once.
- We do not migrate reflogs, because we have no interfaces to write
many reflog entries.
- We do not lock the repository for concurrent access, and thus
concurrent writes may end up with weird in-between states. There is
no way to fully lock the "files" backend for writes due to its
format, and thus we punt on this topic altogether and defer to the
user to avoid those from happening.
In other words, this version is a minimum viable product for migrating a
repository's ref storage format. It works alright for bare repos, which
often have neither worktrees nor reflogs. But it will not work for many
other repositories without some preparations. These limitations are not
set into stone though, and ideally we will eventually address them over
time.
The logic is not yet used by anything, and thus there are no tests for
it. Those will be added in the next commit.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We're about to introduce logic to migrate ref storages. One part of the
migration will be to delete the files that are part of the old ref
storage format. We don't yet have a way to delete such data generically
across ref backends though.
Implement a new `delete` callback and expose it via a new
`ref_storage_delete()` function.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In `get_worktree_ref_store()` we either return the repository's main ref
store, or we look up the ref store via the map of worktree ref stores.
Which of these worktrees gets picked depends on the `is_current` bit of
the worktree, which indicates whether the worktree is the one that
corresponds to `the_repository`.
The bit is getting set in `get_worktrees()`, but only after we have
computed the list of all worktrees. This is too late though, because at
that time we have already called `get_worktree_ref_store()` on each of
the worktrees via `add_head_info()`. The consequence is that the current
worktree will not have been marked accordingly, which means that we did
not use the main ref store, but instead created a new ref store. We thus
have two separate ref stores now that map to the same ref database.
Fix this by setting `is_current` before we call `add_head_info()`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The function `merged_table_release()` releases a merged table, whereas
`reftable_merged_table_free()` releases a merged table and then also
free's its pointer. But all callsites of `merged_table_release()` are in
fact followed by `reftable_merged_table_free()`, which is redundant.
Inline `merged_table_release()` into `reftable_merged_table_free()` to
get rid of this redundance.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The `free_ref_cache()` function is not `NULL` safe and will thus
segfault when being passed such a pointer. This can easily happen when
trying to release a partially initialized "files" ref store. Fix this.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Extract a new function that can be used to iterate through all root refs
known to the "files" backend. This will be used in the next commit,
where we start to teach ref backends to remove themselves.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The `add_pseudoref_and_head_entries()` function accepts both the ref
store as well as a directory name as input. This is unnecessary though
as the ref store already uniquely identifies the root directory of the
ref store anyway.
Furthermore, the function is misnamed now that we have clarified the
meaning of pseudorefs as it doesn't add pseudorefs, but root refs.
Rename it accordingly.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The ref backends do not have any way to disable the creation of reflog
entries. This will be required for upcoming ref format migration logic
so that we do not create any entries that didn't exist in the original
ref database.
Provide a new `REF_SKIP_CREATE_REFLOG` flag that allows the caller to
disable reflog entry creation.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We're about to introduce logic to migrate refs from one storage format
to another one. This will require us to initialize a ref store with a
different format than the one used by the passed-in repository.
Prepare for this by accepting the desired ref storage format as
parameter.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The ref storage format is tracked as a simple unsigned integer, which
makes it harder than necessary to discover what that integer actually is
or where its values are defined.
Convert the ref storage format to instead be an enum.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When reinitializing a repository's version we may end up unsetting the
hash algorithm when it matches the default hash algorithm. If we didn't
do that then the previously configured value might remain intact.
While the same issue exists for the ref storage extension, we don't do
this here. This has been fine for most of the part because it is not
supported to re-initialize a repository with a different ref storage
format anyway. We're about to introduce a new command to migrate ref
storages though, so this is about to become an issue there.
Prepare for this and unset the ref storage format when reinitializing a
repository with the "files" format.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In Python 3.6, unrecognized escape sequences in regular expressions
started to produce a DeprecationWarning [1]. In Python 3.12, this was
upgraded to a SyntaxWarning and will eventually be raised even further
to a SyntaxError. We indirectly hit such unrecognized escape sequences
via Asciidoc, which results in a bunch of warnings:
$ asciidoc -o /dev/null git-cat-file.txt
<unknown>:1: SyntaxWarning: invalid escape sequence '\S'
<unknown>:1: SyntaxWarning: invalid escape sequence '\S'
This in turn causes our "ci/test-documentation.sh" script to fail, as it
checks that stderr of `make doc` is empty.
These escape sequences seem to be part of Asciidoc itself. In the long
term, we should probably consider dropping support for Asciidoc in favor
of Asciidoctor. Upstream also considers itself to be legacy software and
recommends to move away from it [2]:
It is suggested that unless you specifically require the AsciiDoc.py
toolchain, you should find a processor that handles the modern
AsciiDoc syntax.
For now though, let's expand its lifetime a little bit more by filtering
out these new warnings. We should probably reconsider once the warnings
are upgraded to errors by Python.
[1]: https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals
[2]: 6d9f76cff0/README.md (asciidocpy)
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Add another job to execute `make check-docs`, which lints our
documentation and makes sure that expected manpages exist. This job
mirrors the same job that we already have for GitHub Actions.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The "lint-manpages.sh" script does not return an error in case any of
its checks fail. While this is faithful to the implementation that we
had as part of the "check-docs" target before the preceding commit, it
makes it hard to spot any violations of the rules via the corresponding
CI job, which will of course exit successfully, too.
Adapt the script to bubble up errors.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The "check-docs" target of our top-level Makefile fulfills two different
roles. For one it runs the "lint-docs" target of the "Documentation/"
Makefile. And second it performs some checks of whether there are any
manpages that are missing or extraneous via some inline scripts.
The second set of checks feels quite misplaced in the top-level Makefile
as it would fit in much better with our "lint-docs" target. Back when
the checks were introduced in 8c989ec528 (Makefile: $(MAKE) check-docs,
2006-04-13), that target did not yet exist though.
Furthermore, the script makes use of several Makefile variables which
are defined in the top-level Makefile, which makes it hard to access
their contents from elsewhere. There is a trick though that we already
use in "check-builtins.sh" to gain access: we can create an ad-hoc
Makefile that has an extra target to print those variables.
Pull out the script into a separate "lint-manpages.sh" script by using
that trick. Wire up that script via the "lint-docs" target. For one,
normal shell scripts are way easier to reason about than those which are
embedded in a Makefile. Second, it allows one to easily execute the
script standalone without any of the other checks.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The configuration variable stopped doing anything (other than
announcing itself as a variable that does not do anything useful,
when it is used) in Git 2.40.
At this point, it is not even worth giving the warning, which was
meant to be a way to help users notice they are carrying unused
cruft in their configuration files and give them a chance to
clean-up.
Let's remove the warning and documentation for it, and truly stop
paying attention to it.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
Documentation/config/add.txt | 6 ------
builtin/add.c | 6 +-----
t/t3701-add-interactive.sh | 15 ---------------
3 files changed, 1 insertion(+), 26 deletions(-)
51441e64 (stop using HEAD for attributes in bare repository by
default, 2024-05-03) has addressed a recent performance regression
by partially reverting a topic that was merged at 26dd307c (Merge
branch 'jc/attr-tree-config', 2023-10-30). But it forgot to update
the documentation to remove the mention of a special case in bare
repositories.
Let's update the document before the update hits the next release.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In insert_recursive_pattern(), we create a new pattern_entry to insert
into the parent_hashmap. If we find that the same entry already exists
in the hashmap, we skip adding the new one. But we forget to free the new
one, creating a leak.
We can fix it by cleaning up the discarded entry. It would probably be
possible to avoid creating it in the first place, but it's non-trivial.
We'd have to define a "keydata" struct that lets us compare the existing
entries to the broken-out fields. It's probably not worth the
complexity, so we'll punt on that for now.
There is one subtlety here: our insertion is happening in a loop, with
each iteration looking at the pattern we just inserted (hence the
"recursive" in the name). So if we skip insertion, what do we look at?
The obvious answer is that we should remember the existing duplicate we
found and use that. But I _think_ in that case, we probably already have
all of the recursive bits already (from when the original entry was
added). And so just breaking out of the loop would be correct. But I'm
not 100% sure on that; after all, the original leaky code could have
done the same break, but it didn't.
So I went with the "obvious answer" above, which has no chance of
changing the behavior aside from fixing the leak.
With this patch, t1091 can now be marked leak-free.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In sparse_checkout_list(), we put the hashmap entries into a string_list
so we can sort them. But after printing, we forget to free the list.
This patch drops 5 leaks from t1091.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In sparse_checkout_list(), we create a pattern_list that needs to
eventually be cleared. We remember to do so in the regular code path,
but the cone-mode path does an early return, and forgets to clean up.
We could fix the leak by adding a new call to clear_pattern_list(). But
we can simplify even further by just skipping the early return, pushing
the other code path (which consists now of only one line!) into an else
block. That also matches the same cone/non-cone if/else used in some
other functions.
This fixes 15 leaks found in t1091.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We allocate a heap buffer via get_sparse_checkout_filename(). Most calls
remember to free it, but sparse_checkout_init() forgets to, causing a
leak. Ironically, it remembers to do so in the error return paths, but
not in the path that makes it all the way to the function end!
Fixing this clears up 6 leaks from t1091.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In update_working_directory(), we take in a pattern_list, attach it to
the repository index by assigning it to index->sparse_checkout_patterns,
and then call unpack_trees. Afterwards, we remove it by setting
index->sparse_checkout_patterns back to NULL.
But there are two possible leaks here:
1. If the index already had a populated sparse_checkout_patterns,
we've obliterated it. We can fix this by saving and restoring it,
rather than always setting it back to NULL.
2. We may call the function with a NULL pattern_list, expecting it to
use the on-disk sparse file. In that case, the index routines will
lazy-load the sparse patterns automatically. But now at the end of
the function when we restore the patterns, we'll leak those
lazy-loaded ones!
We can fix this by freeing the pattern list before overwriting its
pointer whenever it does not match what was passed in (in practice
this should only happen when the passed-in list is NULL, but this
is erring on the defensive side).
Together these remove 48 indirect leaks found in t1091.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In add_patterns_from_input(), we may read lines from a file with a loop
like this:
while (!strbuf_getline(&line, file)) {
...
strbuf_to_cone_pattern(&line, pl);
}
/* we don't strbuf_release(&line) here! */
This generally is OK because strbuf_to_cone_pattern() consumes the
buffer via strbuf_detach(). But we can leak in a few cases:
1. We don't always consume the buffer! If the line ends up empty after
trimming, we leave strbuf_to_cone_pattern() without detaching. In
most cases this is OK, because a subsequent getline() call will use
the same buffer. But if you had an empty line at the end of file,
for example, it would leak.
2. Even if strbuf_to_cone_pattern() always consumed the buffer,
there's a subtle issue with strbuf_getline(). As we saw in
94e2aa555e (strbuf: fix leak when `appendwholeline()` fails with
EOF, 2024-05-27), it's possible for it to return EOF with an
allocated buffer (e.g., if the underlying getdelim() call saw an
error). So we should always strbuf_release() after finishing a read
loop like this.
Note that even the code to read patterns from argv has the same problem.
Because that also uses strbuf_to_cone_pattern(), we stuff each argv
entry into a strbuf. It uses the same "line" strbuf as the getline code,
but we should position the strbuf_release() to cover both code paths.
This fixes at least 9 leaks found in t1091.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we read patterns from --stdin, we loop on strbuf_getline(), and
detach each line we read to pass into add_pattern(). This used to be
necessary because add_pattern() required that the pattern strings remain
valid while the pattern_list was in use. But it also created a leak,
since we didn't record the detached buffers anywhere else.
Now that add_pattern() has been modified to make its own copy of the
strings, we can stop detaching and fix the leak. This fixes 4 leaks
detected in t1091.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The add_pattern() function has a subtle and undocumented gotcha: the
pattern string you pass in must remain valid as long as the pattern_list
is in use (and nor do we take ownership of it). This is easy to get
wrong, causing either subtle bugs (because you free or reuse the string
buffer) or leaks (because you copy the string, but don't track ownership
separately).
All of this "pattern" code was originally the "exclude" mechanism. So
this _usually_ works OK because you add entries in one of two ways:
1. From the command-line (e.g., "--exclude"), in which case we're
pointing to an argv entry which remains valid for the lifetime of
the program.
2. From a file (e.g., ".gitignore"), in which case we read the whole
file into a buffer, attach it to the pattern_list's "filebuf"
entry, then parse the buffer in-place (adding NULs). The strings
point into the filebuf, which is cleaned up when the whole
pattern_list goes away.
But other code, like sparse-checkout, reads individual lines from stdin
and passes them one by one to add_pattern(), leaking each. We could fix
this by refactoring it to take in the whole buffer at once, like (2)
above, and stuff it in "filebuf". But given how subtle the interface is,
let's just fix it to always copy the string.
That seems at first like we'd be wasting extra memory, but we can
mitigate that:
a. The path_pattern struct already uses a FLEXPTR, since we sometimes
make a copy (when we see "foo/", we strip off the trailing slash,
requiring a modifiable copy of the string).
Since we'll now always embed the string inside the struct, we can
switch to the regular FLEX_ARRAY pattern, saving us 8 bytes of
pointer. So patterns with a trailing slash and ones under 8 bytes
actually get smaller.
b. Now that we don't need the original string to hang around, we can
get rid of the "filebuf" mechanism entirely, and just free the file
contents after parsing. Since files are the sources we'd expect to
have the largest pattern sets, we should mostly break even on
stuffing the same data into the individual structs.
This patch just adjusts the add_pattern() interface; it doesn't fix any
leaky callers yet.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In a2bc523e1e (dir.c: skip .gitignore, etc larger than INT_MAX,
2024-05-31) we put capped the size of some files whose parsing code and
data structures used ints. Setting the limit to INT_MAX was a natural
spot, since we know the parsing code would misbehave above that.
But it also leaves the possibility of overflow errors when we multiply
that limit to allocate memory. For instance, a file consisting only of
"a\na\n..." could have INT_MAX/2 entries. Allocating an array of
pointers for each would need INT_MAX*4 bytes on a 64-bit system, enough
to overflow a 32-bit int.
So let's give ourselves a bit more safety margin by giving a much
smaller limit. The size 100MB is somewhat arbitrary, but is based on the
similar value for attribute files added by 3c50032ff5 (attr: ignore
overly large gitattributes files, 2022-12-01).
There's no particular reason these have to be the same, but the idea is
that they are in the ballpark of "so huge that nobody would care, but
small enough to avoid malicious overflow". So lacking a better guess, it
makes sense to use the same value. The implementation here doesn't share
the same constant, but we could change that later (or even give it a
runtime config knob, though nobody has complained yet about the
attribute limit).
And likewise, let's add a few tests that exercise the limits, based on
the attr ones. In this case, though, we never read .gitignore from the
index; the blob code is exercised only for sparse filters. So we'll
trigger it that way.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We call the tips of branches "heads", but this command calls the
option to show only branches "--heads", which confuses the branches
themselves and the tips of branches.
Straighten the terminology by introducing "--branches" option that
limits the output to branches, and deprecate "--heads" option used
that way.
We do not plan to remove "--heads" or "-h" yet; we may want to do so
at Git 3.0, in which case, we may need to start advertising upcoming
removal with an extra warning when they are used.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We call the tips of branches "heads", but this command calls the
option to show only branches "--heads", which confuses the branches
themselves and the tips of branches.
Straighten the terminology by introducing "--branches" option that
limits the output to branches, and deprecate "--heads" option used
that way.
We do not plan to remove "--heads" or "-h" yet; we may want to do so
at Git 3.0, in which case, we may need to start advertising upcoming
removal with an extra warning when they are used.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
These things in refs/heads/ hierarchy are called "branches" in human
parlance. Replace REF_HEADS with REF_BRANCHES to make it clearer.
No end-user visible change intended at this step.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
EVen with the minimum "no-op" invocation t1517 makes, "git imap-send"
leaks an empty strbuf it used to read a 0-byte string into.
There are a few other topics cooking in 'next' that plugs many
other leaks in this program, so let's minimally fix this one, barely
enough to make CI pass, leaving the rest for the other topic.
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In add_pattern_to_hashsets(), we remove entries from the
recursive_hashmap when adding similar ones to the parent_hashmap. I
won't pretend to understand all of what's going on here, but there's an
obvious leak: whatever we removed from recursive_hashmap is not
referenced anywhere else, and is never free()d.
We can easily fix this by asking the hashmap to return a pointer to the
old entry. This makes t7002 now completely leak-free.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In sparse_checkout_init(), we first try to load patterns from an
existing file. If we found any, we return immediately, but end up
leaking the patterns we parsed. Fixing this reduces the number of leaks
in t7002 from 9 down to 5.
Note that there are two other exits from the function, but they don't
need the same treatment:
- if we can't resolve HEAD, we write out a hard-coded sparse file and
return. But we know the pattern list is empty there, since we didn't
find any in the on-disk file and we haven't yet added any of our
own.
- otherwise, we do populate the list and then tail-call into
write_patterns_and_update(). But that function frees the
pattern_list itself, so we don't need to.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The pattern_list structs used for cone-mode sparse lookups use a few
extra hashmaps. These store pattern_entry structs, each of which has its
own heap-allocated pattern string. When we clean up the hashmaps, we
free the individual pattern_entry structs, but forget to clean up the
embedded strings, causing memory leaks.
We can fix this by iterating over the hashmaps to free the extra
strings. This reduces the numbers of leaks in t7002 from 22 to 9.
One alternative here would be to make the string a FLEX_ARRAY member of
the pattern_entry. Then there's no extra free() required, and as a bonus
it would be a little more efficient. However, some of the refactoring
gets awkward, as we are often assigning strings allocated by helper
functions. So let's just fix the leak for now, and we can explore bigger
refactoring separately.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The add_pattern() function takes a pattern string, but neither makes a
copy of it nor takes ownership of the memory. So it is the caller's
responsibility to make sure the string hangs around as long as the
pattern_list which references it.
There are a few cases in sparse-checkout where we use string literal
patterns by stuffing them into a strbuf, detaching the buffer, and then
passing the result into add_pattern(). This creates a leak when the
pattern_list is eventually cleared, since we don't retain a copy of the
detached buffer to free.
But we can observe that the whole strbuf dance is unnecessary. The point
was presumably[1] to satisfy the lifetime requirement of the string. But
string literals have static duration; we can count on them lasting for
the whole program.
So we can fix the leak by just passing them directly. And as a bonus,
that simplifies the code. The leaks can be seen in t7002, which drops
from 25 leaks to 22 with this patch. It also makes t3602 and t1090
leak-free.
In the long run, we will also want to clean up this (undocumented!)
memory lifetime requirement of add_pattern(). But that can come in a
later patch; passing the string literals directly will be the right
thing either way.
[1] The code in question comes from 416adc8711 (sparse-checkout: update
working directory in-process for 'init', 2019-11-21) and 99dfa6f970
(sparse-checkout: use in-process update for disable subcommand,
2019-11-21), but I didn't see anything in their commit messages or
on the list explaining the strbufs.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We use a string list to hold sorted and de-duped patterns, but don't
free it before leaving the function, causing a leak.
This drops the number of leaks found in t7002 from 27 to 25.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When "git push" notices that the commit at the tip of the ref on
the other side it is about to overwrite does not exist locally, it
used to first try fetching it if the local repository is a partial
clone. The command has been taught not to do so and immediately
fail instead.
* th/push-local-ff-check-without-lazy-fetch:
push: don't fetch commit object when checking existence
"git init" in an already created directory, when the user
configuration has includeif.onbranch, started to fail recently,
which has been corrected.
* ps/fix-reinit-includeif-onbranch:
setup: fix bug with "includeIf.onbranch" when initializing dir
This adds a trace point in start_command so we can see the full
command invocation without having to resort to strace/code inspection.
For example:
$ GIT_TRACE=1 git test foo
git.c:755 trace: exec: git-test foo
run-command.c:657 trace: run_command: git-test foo
run-command.c:657 trace: run_command: 'echo $*' foo
run-command.c:749 trace: start_command: /bin/sh -c 'echo $* "$@"' 'echo $*' foo
Prior changes have made the documentation around the internals of the
alias command execution clearer, but I have still found this detailed
view of the aliased command being run helpful for debugging purposes.
A test case is added to ensure the full command output is present in
the execution flow.
Signed-off-by: Ian Wienand <iwienand@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When writing inline shell for shell-expansion aliases (i.e. prefixed
with "!"), there are some caveats around argument parsing to be aware
of. This series of notes attempts to explain what is happening more
clearly.
Signed-off-by: Ian Wienand <iwienand@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We use add_patterns() to read .gitignore, .git/info/exclude, etc, as
well as other pattern-like files like sparse-checkout. The parser for
these uses an "int" as an index, meaning that files over 2GB will
generally cause signed integer overflow and out-of-bounds access.
This is unlikely to happen in any real files, but we do read .gitignore
files from the tree. A malicious tree could cause an out-of-bounds read
and segfault (we also write NULs over newlines, so in theory it could be
an out-of-bounds write, too, but as we go char-by-char, the first thing
that happens is trying to read a negative 2GB offset).
We could fix the most obvious issue by replacing one "int" with a
"size_t". But there are tons of "int" sprinkled throughout this code for
things like pattern lengths, number of patterns, and so on. Since nobody
would actually want a 2GB .gitignore file, an easy defensive measure is
to just refuse to parse them.
The "int" in question is in add_patterns_from_buffer(), so we could
catch it there. But by putting the checks in its two callers, we can
produce more useful error messages.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge down a handful of topics to adjust tests and CI to make them
work better, without changing Git itself, and a bit of developer
docs update:
* Tests that try to corrupt in-repository files in chunked format did
not work well on macOS due to its broken "mv", which has been
worked around.
* Unbreak CI jobs so that we do not attempt to use Python 2 that has
been removed from the platform.
* Git 2.43 started using the tree of HEAD as the source of attributes
in a bare repository, which has severe performance implications.
For now, revert the change, without ripping out a more explicit
support for the attr.tree configuration variable.
* Windows CI running in GitHub Actions started complaining about the
order of arguments given to calloc(); the imported regex code uses
the wrong order almost consistently, which has been corrected.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
