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grep_source(), which performs much of the work for Git's grep library, allows passing an arbitrary struct grep_source which represents the text which grep_source() should search to match a pattern in the provided struct grep_opt. In most callers, the grep_source::name field is set to an appropriate prefix to print before a colon when a result matches: README:Git is an Open Source project covered by the GNU General One caller, grep_buffer(), leaves the grep_source::name field set to NULL because there isn't enough context to determine an appropriate name for this kind of output line. In practice, this has been fine: the only caller of grep_buffer() is "git log --grep", and that caller sets grep_opt::status_only, which disables output and only checks whether a match exists. But this is brittle: a future caller can call grep_buffer() without grep_opt::status_only set, and as soon as it hits a match, grep_source() will try to print the match and segfault: (null):Git is an Open Source project covered by the GNU General For example, a future caller might want to print all matching lines from commits which match a regex. Futureproof by diagnosing early a use of the API that could trigger that condition, before we know whether the pattern matches: BUG: grep.c:1783: grep call which could print a name requires grep_source.name be non-NULL Aborted This way, the caller's author gets an indication of how to fix the issue - by providing grep_source::name or setting grep_opt::status_only - and they are warned of the potential for a segfault unconditionally, rather than only if there is a match. Noticed while adding such a call to a tutorial on revision walks. Signed-off-by: Emily Shaffer <emilyshaffer@google.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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-.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). To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at https://public-inbox.org/git/, http://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