3540c71ea5
Add fatal wrappers for setenv() and unsetenv(). Ind7ac12b25d(Add set_git_dir() function, 2007-08-01) we started checking its return value, and since48988c4d0c(set_git_dir: die when setenv() fails, 2018-03-30) we've had set_git_dir_1() die if we couldn't set it. Let's provide a wrapper for both, this will be useful in many other places, a subsequent patch will make another use of xsetenv(). The checking of the return value here is over-eager according to setenv(3) and POSIX. It's documented as returning just -1 or 0, so perhaps we should be checking -1 explicitly. Let's just instead die on any non-zero, if our C library is so broken as to return something else than -1 on error (and perhaps not set errno?) the worst we'll do is die with a nonsensical errno value, but we'll want to die in either case. Let's make these return "void" instead of "int". As far as I can tell there's no other x*() wrappers that needed to make the decision of deviating from the signature in the C library, but since their return value is only used to indicate errors (so we'd die here), we can catch unreachable code such as if (xsetenv(...) < 0) [...]; I think it would be OK skip the NULL check of the "name" here for the calls to die_errno(). Almost all of our setenv() callers are taking a constant string hardcoded in the source as the first argument, and for the rest we can probably assume they've done the NULL check themselves. Even if they didn't, modern C libraries are forgiving about it (e.g. glibc formatting it as "(null)"), on those that aren't, well, we were about to die anyway. But let's include the check anyway for good measure. 1. https://pubs.opengroup.org/onlinepubs/009604499/functions/setenv.html Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@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.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