When validating that a commit-graph has either all zero, or all non-zero
generation numbers, we emit a warning on both the rising and falling
edge of transitioning between the two.
So if we are unfortunate enough to see a commit-graph which has a
repeating sequence of zero, then non-zero generation numbers, we'll
generate many warnings that contain more or less the same information.
Avoid this by keeping track of a single example for a commit with zero-
and non-zero generation, and emit a single warning at the end of
verification if both are non-NULL.
Co-authored-by: Jeff King <peff@peff.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The second test called "detect incorrect generation number" asserts that
we correctly warn during an fsck when we see a non-zero generation
number after seeing a zero beforehand.
The other transition (going from non-zero to zero) was previously
untested. Test both directions, and rename the existing test to make
clear which direction it is exercising.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In verify_one_commit_graph(), we have code that complains when a commit
is found with a generation number of zero, and then later with a
non-zero number. It works like this:
1. When we see an entry with generation zero, we set the
generation_zero flag to GENERATION_ZERO_EXISTS.
2. When we later see an entry with a non-zero generation, we complain
if the flag is GENERATION_ZERO_EXISTS.
There's a matching GENERATION_NUMBER_EXISTS value, which in theory would
be used to find the case that we see the entries in the opposite order:
1. When we see an entry with a non-zero generation, we set the
generation_zero flag to GENERATION_NUMBER_EXISTS.
2. When we later see an entry with a zero generation, we complain if
the flag is GENERATION_NUMBER_EXISTS.
But that doesn't work; step 2 is implemented, but there is no step 1. We
never use NUMBER_EXISTS at all, and Coverity rightly complains that step
2 is dead code.
We can fix that by implementing that step 1.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In 2ee11f7261 (commit-graph: return generation from memory, 2023-03-20),
the `commit_graph_generation()` function stopped returning zeros when
asked to locate the generation number of a given commit.
This was done at the time to prepare for a later change which set
generation values in memory, meaning that we could no longer rely on
`graph_pos` alone to tell us whether or not to trust the generation
number returned by this function.
In 2ee11f7261, it was noted that this change only impacted very old
commit-graphs, which were written with all commits having generation
number 0. Indeed, zero is not a valid generation number, so we should
never expect to see that value outside of the aforementioned case.
The test fallout in 2ee11f7261 indicated that we were no longer able to
fsck a specific old case of commit-graph corruption, where we see a
non-zero generation number after having seen a generation number of 0
earlier.
Introduce a variant of `commit_graph_generation()` which behaves like
that function did prior to 2ee11f7261, known as
`commit_graph_generation_from_graph()`. Then use this function in the
context of `verify_one_commit_graph()`, where we only want to trust the
values from the graph.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Leakfixes.
* ew/sha256-gcrypt-leak-fixes:
sha256/gcrypt: die on gcry_md_open failures
sha256/gcrypt: fix memory leak with SHA-256 repos
sha256/gcrypt: fix build with SANITIZE=leak
Tone down the warning on SHA-256 repositories being an experimental
curiosity. We do not have support for them to interoperate with
traditional SHA-1 repositories, but at this point, we do not plan
to make breaking changes to SHA-256 repositories and there is no
longer need for such a strongly phrased warning.
* am/doc-sha256:
doc: sha256 is no longer experimental
"git branch -f X" to repoint the branch X said that X was "checked
out" in another worktree, even when branch X was not and instead
being bisected or rebased. The message was reworded to say the
branch was "in use".
* jc/branch-in-use-error-message:
branch: update the message to refuse touching a branch in-use
"git blame --contents=file" has been taught to work in a bare
repository.
* hy/blame-in-bare-with-contents:
blame: allow --contents to work with bare repo
Command line parser fix, and a small parse-options API update.
* jc/parse-options-short-help:
short help: allow a gap smaller than USAGE_GAP
remote: simplify "remote add --tags" help text
short help: allow multi-line opthelp
Clarify how to pick a starting point for a new topic in the
SubmittingPatches document.
* la/doc-choose-starting-point-fixup:
SubmittingPatches: use of older maintenance tracks is an exception
SubmittingPatches: explain why 'next' and above are inappropriate base
SubmittingPatches: choice of base for fixing an older maintenance track
Rewrite the description of giving a custom command to the
submodule.<name>.update configuration variable.
* pv/doc-submodule-update-settings:
doc: highlight that .gitmodules does not support !command
Fix tests with unportable regex patterns.
* ja/worktree-orphan-fix:
t2400: rewrite regex to avoid unintentional PCRE
builtin/worktree.c: convert tab in advice to space
t2400: drop no-op `--sq` from rev-parse call
The implementation of "get_sha1_hex()" that reads a hexadecimal
string that spells a full object name has been extended to cope
with any hash function used in the repository, but the "sha1" in
its name survived. Rename it to get_hash_hex(), a name that is
more consistent within its friends like get_hash_hex_algop().
* jc/retire-get-sha1-hex:
hex: retire get_sha1_hex()
Clarify how to choose the starting point for a new topic in
developer guidance document.
* la/doc-choose-starting-point:
SubmittingPatches: simplify guidance for choosing a starting point
SubmittingPatches: emphasize need to communicate non-default starting points
SubmittingPatches: de-emphasize branches as starting points
SubmittingPatches: discuss subsystems separately from git.git
SubmittingPatches: reword awkward phrasing
Fix a typo introduced in aa9166bcc0 (The ninth batch, 2023-07-08).
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git branch --list --format=<format>" and friends are taught
a new "%(describe)" placeholder.
* ks/ref-filter-describe:
ref-filter: add new "describe" atom
ref-filter: add multiple-option parsing functions
When the user edits "rebase -i" todo file so that it starts with a
"fixup", which would make it invalid, the command truncated the
rest of the file before giving an error and returning the control
back to the user. Stop truncating to make it easier to correct
such a malformed todo file.
* ah/sequencer-rewrite-todo-fix:
sequencer: finish parsing the todo list despite an invalid first line
Instead of inventing a custom counter variables for debugging,
use existing trace2 facility in the fsync customization codepath.
* bb/use-trace2-counters-for-fsync-stats:
wrapper: use trace2 counters to collect fsync stats
"./configure --with-expat=no" did not work as a way to refuse use
of the expat library on a system with the library installed, which
has been corrected.
* ah/autoconf-fixes:
configure.ac: always save NO_ICONV to config.status
configure.ac: don't overwrite NO_CURL option
configure.ac: don't overwrite NO_EXPAT option
Code simplification.
* jc/tree-walk-drop-base-offset:
tree-walk: drop unused base_offset from do_match()
tree-walk: lose base_offset that is never used in tree_entry_interesting
Remove scary wording that basically stops people using sha256
repositories not because of interoperability issues with sha1
repositories, but from fear that their work will suddenly become
incompatible in some future version of git.
We should be clear that currently sha256 repositories will not work with
sha1 repositories but stop the scary words.
Signed-off-by: Adam Majer <adamm@zombino.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
`gcry_md_open' allocates memory and must (like all allocation
functions) be checked for failure.
Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
`gcry_md_open' needs to be paired with `gcry_md_close' to ensure
resources are released. Since our internal APIs don't have
separate close/release callbacks, sticking it into the finalization
callback seems appropriate.
Building with SANITIZE=leak and running `git fsck' on a SHA-256
repository no longer reports leaks.
Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Non-static functions cause `undefined reference' errors when
building with `SANITIZE=leak' due to the lack of prototypes.
Mark all these functions as `static inline' as we do in
sha256/nettle.h to avoid the need to maintain prototypes.
Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git bundle" passes the progress control options to "git pack-objects"
by parsing and then recreating them explicitly. Simplify that process
by using OPT_PASSTHRU_ARGV instead.
This also fixes --no-quiet, which has been doing the same as --quiet
since its introduction by 79862b6b77 (bundle-create: progress output
control, 2019-11-10) because it had been defined using OPT_SET_INT with
a value of 0, which sets 0 when negated as well.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Finding mistakes in and improving your own patches is a good idea,
but doing so too quickly is being inconsiderate to reviewers who
have just seen the initial iteration and taking their time to review
it. Encourage new developers to perform such a self review before
they send out their patches, not after. After sending a patch that
they immediately found mistakes in, they are welcome to comment on
them, mentioning what and how they plan to improve them in an
updated version, before sending out their updates.
Helped-by: Torsten Bögershausen <tboegi@web.de>
Helped-by: Linus Arver <linusa@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Command line parser fixes.
* jc/parse-options-show-branch:
show-branch: reject --[no-](topo|date)-order
show-branch: --no-sparse should give dense output
While we could technically fix each and every bug on top of the
commit that introduced it, it is not necessarily practical. For
trivial and low-value bugfixes, it often is simpler and sufficient
to just fix it in the current maintenance track, leaving the bug
unfixed in the older maintenance tracks.
Demote the "use older maintenance track to fix old bugs" as a side
note, and explain that the choice is used only in exceptional cases.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The 'next' branch is primarily meant to be a testing ground to make
sure that topics that are reasonably well done work well together.
Building a new work on it would mean everything that was already in
'next' must have graduated to 'master' before the new work can also
be merged to 'master', and that is why we do not encourage basing
new work on 'next'.
Helped-by: Linus Arver <linusa@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Replace all cases of `\s` with ` ` as it is not part of POSIX BRE or ERE
and therefore not all versions of grep handle it.
For the same reason all cases of `\S` are replaced with `[^ ]`. It is
not an exact replacement but it is close enough for this use case.
Also, do not write `\+` in BRE and expect it to mean 1 or more;
it is a GNU extension that may not work everywhere.
Remove `.*` from the end of a pattern that is not right-anchored.
Signed-off-by: Jacob Abel <jacobabel@nullpo.dev>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
