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Patrick Steinhardt 6d6a3a99c7 refs: implement logic to migrate between ref storage formats With the introduction of the new "reftable" backend, users may want to migrate repositories between the backends without having to recreate the whole repository. Add the logic to do so. The implementation is generic and works with arbitrary ref storage formats so that a backend does not need to implement any migration logic. It does have a few limitations though: - We do not migrate repositories with worktrees, because worktrees have separate ref storages. It makes the overall affair more complex if we have to migrate multiple storages at once. - We do not migrate reflogs, because we have no interfaces to write many reflog entries. - We do not lock the repository for concurrent access, and thus concurrent writes may end up with weird in-between states. There is no way to fully lock the "files" backend for writes due to its format, and thus we punt on this topic altogether and defer to the user to avoid those from happening. In other words, this version is a minimum viable product for migrating a repository's ref storage format. It works alright for bare repos, which often have neither worktrees nor reflogs. But it will not work for many other repositories without some preparations. These limitations are not set into stone though, and ideally we will eventually address them over time. The logic is not yet used by anything, and thus there are no tests for it. Those will be added in the next commit. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2024-06-06 09:04:33 -07:00
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refs	refs: implement removal of ref storages	2024-06-06 09:04:33 -07:00
reftable	reftable: inline `merged_table_release()`	2024-06-06 09:04:32 -07:00
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refs.c	refs: implement logic to migrate between ref storage formats	2024-06-06 09:04:33 -07:00
refs.h	refs: implement logic to migrate between ref storage formats	2024-06-06 09:04:33 -07:00
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worktree.c	worktree: don't store main worktree twice	2024-06-06 09:04:33 -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 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