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The compute_generation_numbers() method was introduced by3258c663(commit-graph: compute generation numbers, 2018-05-01) to compute what is now known as "topological levels". These are still stored in the commit-graph file for compatibility sake whilec1a09119(commit-graph: implement corrected commit date, 2021-01-16) updated the method to also compute the new version of generation numbers: corrected commit date. It makes sense why these are grouped. They perform very similar walks of the necessary commits and compute similar maximums over each parent. However, having these two together conflates them in subtle ways that is hard to separate. In particular, the topo_level slab is used to store the topological levels in all cases, but the commit_graph_data_at(c)->generation member stores different values depending on the state of the existing commit-graph file. * If the existing commit-graph file has a "GDAT" chunk, then these values represent corrected commit dates. * If the existing commit-graph file doesn't have a "GDAT" chunk, then these values are actually the topological levels. This issue only occurs only when upgrading an existing commit-graph file into one that has the "GDAT" chunk. The current change does not resolve this upgrade problem, but splitting the implementation into two pieces here helps with that process, which will follow in the next change. The important thing this helps with is the case where the num_generation_data_overflows was being incremented incorrectly, triggering a write of the overflow chunk. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Reviewed-by: Taylor Blau <me@ttaylorr.com> 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