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We have split the CI jobs in GitHub Workflows into two categories:
- Those running on a machine pool directly.
- Those running in a container on the machine pool.
The latter is more flexible because it allows us to freely pick whatever
container image we want to use for a specific job, while the former only
allows us to pick from a handful of different distros. The containerized
jobs do not have any significant downsides to the best of my knowledge:
- They aren't significantly slower to start up. A quick comparison by
Peff shows that the difference is mostly lost in the noise:
job | old | new
--------------------|------|------
linux-TEST-vars 11m30s 10m54s
linux-asan-ubsan 30m26s 31m14s
linux-gcc 9m47s 10m6s
linux-gcc-default 9m47s 9m41s
linux-leaks 25m50s 25m21s
linux-meson 10m36s 10m41s
linux-reftable 10m25s 10m23s
linux-reftable-leaks 27m18s 27m28s
linux-sha256 9m54s 10m31s
Some jobs are a bit faster, some are a bit slower, but there does
not seem to be any significant change.
- Containerized jobs run as root, which keeps a couple of tests from
running. This has been addressed in the preceding commit though,
where we now use setpriv(1) to run tests as a separate user.
- GitHub injects a Node binary into containerized jobs, which is
dynamically linked. This has led to some issues in the past [1], but
only for our 32 bit jobs. The issues have since been resolved.
Overall there seem to be no downsides, but the upside is that we have
more control over the exact image that these jobs use. Convert the Linux
jobs accordingly.
[1]: https://lore.kernel.org/git/20240912094841.GD589828@coredump.intra.peff.net/
Signed-off-by: Patrick Steinhardt <ps@pks.im>
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 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).
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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