pack-bitmap: handle objects at bitmap position zero `bitmap_position()` only returns a negative value when an object is not present in the bitmap index. In `find_objects()`, we have added a check (11d45a6e6a) to avoid processing a root whose reachability is already represented by the base bitmap, but accidentally uses `pos > 0`. Consequently, it never performs the membership test for an object at position zero. If that object has an individual reachability bitmap, we unnecessarily OR that bitmap into the base again. Otherwise, we add the object to the not-mapped list, only for the subsequent pass to recognize that it is already present. The latter pass correctly treats all non-negative positions as valid, so this does not change the resulting object set, but an off-by-one edge case. Treat position zero as valid by changing the condition to `pos >= 0`. The existing pseudo-merge traversal test exercises this case. Its position-zero commit is presented through multiple roots. Before this change, each occurrence is counted as a bitmap hit; afterwards, only the first occurrence is counted. Assert the resulting hit count to cover the boundary condition. Also cover the non-pseudo-merge case by passing `HEAD` twice. The first occurrence initializes the base from its stored bitmap, and the second must recognize that position zero is already present. Helped-by: Taylor Blau <ttaylorr@openai.com> Signed-off-by: David Lin <davidlin@stripe.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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).
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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):