3b7a4475b0
When a split-index is in effect, the `$GIT_DIR/index` file needs to contain a "link" extension that contains all the information about the split-index, including the information about the shared index. However, in some cases Git needs to suppress writing that "link" extension (i.e. to fall back to writing a full index) even if the in-memory index structure _has_ a `split_index` configured. This is the case e.g. when "too many not shared" index entries exist. In such instances, the current code sets the `base_oid` field of said `split_index` structure to all-zero to indicate that `do_write_index()` should skip writing the "link" extension. This can lead to problems later on, when the in-memory index is still used to perform other operations and eventually wants to write a split-index, detects the presence of the `split_index` and reuses that, too (under the assumption that it has been initialized correctly and still has a non-null `base_oid`). Let's stop zeroing out the `base_oid` to indicate that the "link" extension should not be written. One might be tempted to simply call `discard_split_index()` instead, under the assumption that Git decided to write a non-split index and therefore the `split_index` structure might no longer be wanted. However, that is not possible because that would release index entries in `split_index->base` that are likely to still be in use. Therefore we cannot do that. The next best thing we _can_ do is to introduce a bit field to indicate specifically which index extensions (not) to write. So that's what we do here. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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| INSTALL | ||
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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