babe131bd7
When writing a cruft pack with an expiration, pack-objects first collects the recent objects and then walks from them to rescue whatever they reach, expired or not. A pack the caller did not list is marked kept while collecting, so that its objects are not copied into the cruft pack, and unmarked before the walk, so that the walk can go through it. The walk does not see the unmarking. Whether an object sits in a kept pack is answered from a cache that is built on first use and only dropped when asked about a different kind of kept pack. Collecting builds it while the unlisted pack is still marked, the walk asks the same kind of question, and so the unlisted pack stays in it: the walk stops there, and whatever lies beyond it in an expired pack is left out of the cruft pack, to go when that pack is deleted. This went unnoticed because of "--honor-pack-keep". repack passes it, and when there is a ".keep" file it makes the collecting side ask about on-disk and in-core kept packs together while the walk asks about in-core ones alone; the cache is rebuilt each time the question changes, and by accident the walk sees the current marks. Take the ".keep" file away and the objects are lost today. A later commit stops repack from passing "--honor-pack-keep" at all, so fix this first. Drop the cache after re-marking. The loop over the object sources that does so lives in packfile.c, as repo_invalidate_kept_pack_caches(), next to has_object_kept_pack() which reads the cache. Like it, the loop assumes every source is a files backend; keeping that assumption in packfile.c rather than adding it to pack-objects means the two can move together once packfile management is pushed down into that backend. The test builds an unreachable chain whose middle commit sits in a pack pack-objects is not told about and whose oldest objects have expired; without the fix the cruft pack holds only the recent tip. Signed-off-by: Qin ShiCheng <qeesung@live.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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| Documentation | ||
| bin-wrappers | ||
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| builtin | ||
| ci | ||
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| compiler-tricks | ||
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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.adoc to get started, then see
Documentation/giteveryday.adoc for a useful minimum set of commands, and
Documentation/git-<commandname>.adoc 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.adoc
(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