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When a lock file is held, it can be helpful to know which process owns it, especially when debugging stale locks left behind by crashed processes. Add an optional feature that creates a companion PID file alongside each lock file, containing the PID of the lock holder. For a lock file "foo.lock", the PID file is named "foo~pid.lock". The tilde character is forbidden in refnames and allowed in Windows filenames, which guarantees no collision with the refs namespace (e.g., refs "foo" and "foo~pid" cannot both exist). The file contains a single line in the format "pid <value>" followed by a newline. The PID file is created when a lock is acquired (if enabled), and automatically cleaned up when the lock is released (via commit or rollback). The file is registered as a tempfile so it gets cleaned up by signal and atexit handlers if the process terminates abnormally. When a lock conflict occurs, the code checks for an existing PID file and, if found, uses kill(pid, 0) to determine if the process is still running. This allows providing context-aware error messages: Lock is held by process 12345. Wait for it to finish, or remove the lock file to continue. Or for a stale lock: Lock was held by process 12345, which is no longer running. Remove the stale lock file to continue. The feature is controlled via core.lockfilePid configuration (boolean). Defaults to false. When enabled, PID files are created for all lock operations. Existing PID files are always read when displaying lock errors, regardless of the core.lockfilePid setting. This ensures helpful diagnostics even when the feature was previously enabled and later disabled. Signed-off-by: Paulo Casaretto <pcasaretto@gmail.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.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).
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