ae1db7b31c
In directory rename detection (when a directory is removed on one side of history and the other side adds new files to that directory), we work to find where the greatest number of files within that directory were renamed to so that the new files can be moved with the majority of the files. Naively, we can just do this by detecting renames for *all* files within the removed/renamed directory, looking at all the destination directories where files within that directory were moved, and if there is more than one such directory then taking the one with the greatest number of files as the directory where the old directory was renamed to. However, sometimes there are enough renames from exact rename detection or basename-guided rename detection that we have enough information to determine the majority winner already. Add a function meant to compute whether particular renames are still needed based on this majority rules check. The next several commits will then add the necessary infrastructure to get the information we need to compute which additional rename sources we can skip. An important side note for future further optimization: There is a possible improvement to this optimization that I have not yet attempted and will not be included in this series of patches: we could first check whether exact renames provide enough information for us to determine directory renames, and avoid doing basename-guided rename detection on some or all of the RELEVANT_LOCATION files within those directories. In effect, this variant would mean doing the handle_early_known_dir_renames() both after exact rename detection and again after basename-guided rename detection, though it would also mean decrementing the number of "unknown" renames for each rename we found from basename-guided rename detection. Adding this additional check for skippable renames right after exact rename detection might turn out to be valuable, especially for partial clones where it might allow us to download certain source files entirely. However, this particular optimization was actually the last one I did in original implementation order, and by the time I implemented this idea, every testcase I had was sufficiently fast that further optimization was unwarranted. If future testcases arise that tax rename detection more heavily (or perhaps partial clones can benefit from avoiding loading more objects), it may be worth implementing this more involved variant. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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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). 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