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When a ref maps to a commit that is neither rewritten nor kept by filter-branch (e.g., because it was eliminated by rev-list's pathspec selection), we rewrite it to its nearest ancestor. Since the initial commit in6f6826c52b(Add git-filter-branch, 2007-06-03), we have warned when there are multiple such ancestors in the map file. However, the warning code is impossible to trigger these days. Sincea0e46390d3(filter-branch: fix ref rewriting with --subdirectory-filter, 2008-08-12), we find the ancestor using "rev-list -1", so it can only ever have a single value. This code is made doubly confusing by the fact that we append to the map file when mapping ancestors. However, this can never yield multiple values because: - we explicitly check whether the map already exists, and if so, do nothing (so our "append" will always be to a file that does not exist) - even if we were to try mapping twice, the process to do so is deterministic. I.e., we'd always end up with the same ancestor for a given sha1. So warning about it would be pointless; there is no ambiguity. So swap out the warning code for a BUG (which we'll simplify further in the next commit). And let's stop using the append operator to make the ancestor-mapping code less confusing. Signed-off-by: Jeff King <peff@peff.net> 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-<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). 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://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