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Taylor Blau 27be76b230 refs.c: remove empty '--exclude' patterns In `59c35fac54` (refs/packed-backend.c: implement jump lists to avoid excluded pattern(s), 2023-07-10), the packed-refs backend learned how to construct "jump lists" to avoid enumerating sections of the packed-refs file that we know the caller is going to throw out anyway. This process works by finding the start- and end-points (that is, where in the packed-refs file corresponds to the range we're going to ignore) for each exclude pattern, then constructing a jump list based on that. At enumeration time we'll consult the jump list to skip past everything in the range(s) found in the previous step, saving time when excluding a large portion of references. But when there is a --exclude pattern which is just the empty string, the behavior is a little funky. When we try and exclude the empty string, the matched range covers the entire packed-refs file, meaning that we won't output any packed references. But the empty pattern doesn't actually match any references to begin with! For example, on my copy of git.git I can do: $ git for-each-ref '' \| wc -l 0 So "git for-each-ref --exclude=''" shouldn't actually remove anything from the output, and ought to be equivalent to "git for-each-ref". But it's not, and in fact: $ git for-each-ref \| wc -l 2229 $ git for-each-ref --exclude='' \| wc -l 480 But why does the '--exclude' version output only some of the references in the repository? Here's a hint: $ find .git/refs -type f \| wc -l 480 Indeed, because the files backend doesn't implement[^1] the same jump list concept as the packed backend we get the correct result for the loose references, but none of the packed references. Since the empty string exclude pattern doesn't match anything, we can discard them before the packed-refs backend has a chance to even see it (and likewise for reftable, which also implements a similar concept since `1869525066` (refs/reftable: wire up support for exclude patterns, 2024-09-16)). This approach (copying only some of the patterns into a strvec at the refs.c layer) may seem heavy-handed, but it's setting us up to fix another bug in the following commit where the fix will involve modifying the incoming patterns. [^1]: As noted in `59c35fac54`. We technically could avoid opening and enumerating the contents of, for e.g., "$GIT_DIR/refs/heads/foo/" if we knew that we were excluding anything under the 'refs/heads/foo' hierarchy. But the --exclude stuff is all best-effort anyway, since the caller is expected to cull out any results that they don't want. Noticed-by: Jeff King <peff@peff.net> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2025-03-06 09:11:04 -08:00
.github	Sync with 2.44.3	2024-11-26 22:15:00 +01:00
Documentation	Git 2.46.3	2024-11-26 22:15:01 +01:00
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builtin	Merge branch 'bl/trailers-and-incomplete-last-line-fix' into maint-2.46	2024-09-23 10:33:00 -07:00
ci	ci: add Ubuntu 16.04 job to GitLab CI	2024-09-13 09:02:30 -07:00
compat	Sync with 2.43.6	2024-11-26 22:14:59 +01:00
contrib	Merge branch 'jk/osxkeychain-username-is-nul-terminated' into maint-2.46	2024-08-26 11:10:17 -07:00
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po	l10n: zh_CN: updated translation for 2.46	2024-07-28 19:52:41 +08:00
refs	Merge branch 'ss/packed-ref-store-leakfix' into maint-2.46	2024-08-26 11:10:22 -07:00
reftable	Merge branch 'cp/unit-test-reftable-record'	2024-07-15 10:11:44 -07:00
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t	refs.c: remove empty '--exclude' patterns	2025-03-06 09:11:04 -08:00
templates	…
trace2	…
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.clang-format	Merge branch 'rs/clang-format-updates'	2024-07-15 10:11:42 -07:00
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.gitlab-ci.yml	ci: add Ubuntu 16.04 job to GitLab CI	2024-09-13 09:02:30 -07:00
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GIT-VERSION-GEN	Git 2.46.3	2024-11-26 22:15:01 +01:00
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LGPL-2.1	…
Makefile	Merge branch 'cp/unit-test-reftable-record'	2024-07-15 10:11:44 -07:00
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RelNotes	Git 2.46.3	2024-11-26 22:15:01 +01:00
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add-patch.c	Merge branch 'pw/add-patch-with-suppress-blank-empty' into maint-2.46	2024-08-16 12:50:54 -07:00
advice.c	Merge branch 'ds/advice-sparse-index-expansion'	2024-07-16 11:18:56 -07:00
advice.h	Merge branch 'ds/advice-sparse-index-expansion'	2024-07-16 11:18:56 -07:00
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apply.c	Merge branch 'jk/apply-patch-mode-check-fix' into maint-2.46	2024-09-12 11:02:15 -07:00
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bundle.c	bundle: default to SHA1 when reading bundle headers	2024-08-13 10:26:44 -07:00
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config.c	Merge branch 'tb/config-fixed-value-with-valueless-true' into maint-2.46	2024-08-26 11:10:18 -07:00
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config.mak.dev	Merge branch 'tb/dev-build-pedantic-fix'	2024-07-15 10:11:42 -07:00
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config.mak.uname	Merge branch 'rj/cygwin-has-dev-tty' into maint-2.46	2024-09-23 10:32:59 -07:00
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credential.c	Sync with 2.45.3	2024-11-26 22:15:01 +01:00
credential.h	Sync with 2.45.3	2024-11-26 22:15:01 +01:00
csum-file.c	csum-file: introduce discard_hashfile()	2024-07-26 09:04:02 -07:00
csum-file.h	csum-file: introduce discard_hashfile()	2024-07-26 09:04:02 -07:00
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git-send-email.perl	Merge branch 'cb/send-email-sanitize-trailer-addresses'	2024-07-16 11:18:56 -07:00
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http.c	Merge branch 'jc/http-cookiefile'	2024-07-17 10:47:26 -07:00
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log-tree.c	Merge branch 'rs/use-decimal-width' into maint-2.46	2024-08-26 11:10:23 -07:00
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mailmap.c	mailmap: plug memory leak in read_mailmap_blob()	2024-07-26 08:00:09 -07:00
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merge-ort.c	Merge branch 'en/ort-inner-merge-error-fix'	2024-07-16 11:18:55 -07:00
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midx-write.c	Merge branch 'ds/midx-write-repack-fix'	2024-07-23 16:54:33 -07:00
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read-cache.c	csum-file: introduce discard_hashfile()	2024-07-26 09:04:02 -07:00
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ref-filter.c	set errno=0 before strtoX calls	2024-08-05 10:59:20 -07:00
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reflog-walk.c	…
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reflog.c	Merge branch 'jc/reflog-expire-lookup-commit-fix' into maint-2.46	2024-08-26 11:10:21 -07:00
reflog.h	…
refs.c	refs.c: remove empty '--exclude' patterns	2025-03-06 09:11:04 -08:00
refs.h	Merge branch 'ch/refs-without-the-repository-fix'	2024-07-18 08:30:25 -07:00
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revision.c	Merge branch 'jk/free-commit-buffer-of-skipped-commits' into maint-2.46	2024-09-13 15:26:49 -07:00
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send-pack.c	Merge branch 'jc/disable-push-nego-for-deletion'	2024-07-15 10:11:43 -07:00
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setup.c	safe.directory: normalize the configured path	2024-07-30 11:47:59 -07:00
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sparse-index.c	Merge branch 'ds/advice-sparse-index-expansion'	2024-07-16 11:18:56 -07:00
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strbuf.c	Sync with 2.45.3	2024-11-26 22:15:01 +01:00
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README.md

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-<commandname>.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

CVS users may also want to read Documentation/gitcvs-migration.txt (man gitcvs-migration or git help cvs-migration if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission and Documentation/CodingGuidelines).

Those wishing to help with error message, usage and informational message string translations (localization l10) should see po/README.md (a po file is a Portable Object file that holds the translations).

To subscribe to the list, send an email to git+subscribe@vger.kernel.org (see https://subspace.kernel.org/subscribing.html for details). The mailing list archives are available at https://lore.kernel.org/git/, https://marc.info/?l=git and other archival sites.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):

random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
"global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
"goddamn idiotic truckload of sh*t": when it breaks