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Jonathan Tan 4d4e49fff1 commit,shallow: unparse commits if grafts changed When a commit is parsed, it pretends to have a different (possibly empty) list of parents if there is graft information for that commit. But there is a bug that could occur when a commit is parsed, the graft information is updated (for example, when a shallow file is rewritten), and the same commit is subsequently used: the parents of the commit do not conform to the updated graft information, but the information at the time of parsing. This is usually not an issue, as a commit is usually introduced into the repository at the same time as its graft information. That means that when we try to parse that commit, we already have its graft information. But it is an issue when fetching a shallow point directly into a repository with submodules. The function assign_shallow_commits_to_refs() parses all sought objects (including the shallow point, which we are directly fetching). In update_shallow() in fetch-pack.c, assign_shallow_commits_to_refs() is called before commit_shallow_file(), which means that the shallow point would have been parsed before graft information is updated. Once a commit is parsed, it is no longer sensitive to any graft information updates. This parsed commit is subsequently used when we do a revision walk to search for submodules to fetch, meaning that the commit is considered to have parents even though it is a shallow point (and therefore should be treated as having no parents). Therefore, whenever graft information is updated, mark the commits that were previously grafts and the commits that are newly grafts as unparsed. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2022-06-06 11:50:34 -07:00
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shallow.c	commit,shallow: unparse commits if grafts changed	2022-06-06 11:50:34 -07:00
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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 with just "subscribe git" in the body to majordomo@vger.kernel.org (not the Git list). The mailing list archives are available at https://lore.kernel.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