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c375a7efa3
We call getaddrinfo() to try to convert a short hostname
into a fully-qualified one (to use it as an email domain).
If there isn't a canonical name, getaddrinfo() will
generally return either a NULL addrinfo list, or one in
which ai->ai_canonname is a copy of the original name.
However, if the result of gethostname() looks like an IP
address, then getaddrinfo() behaves differently on some
systems. On OS X, it will return a "struct addrinfo" with a
NULL ai_canonname, and we segfault feeding it to strchr().
This is hard to test reliably because it involves not only a
system where we we have to fallback to gethostname() to come
up with an ident, but also where the hostname is a number
with no dots. But I was able to replicate the bug by faking
a hostname, like:
diff --git a/ident.c b/ident.c
index e20a772..b790d28 100644
--- a/ident.c
+++ b/ident.c
@@ -128,6 +128,7 @@ static void add_domainname(struct strbuf *out, int *is_bogus)
*is_bogus = 1;
return;
}
+ xsnprintf(buf, sizeof(buf), "1");
if (strchr(buf, '.'))
strbuf_addstr(out, buf);
else if (canonical_name(buf, out) < 0) {
and running "git var GIT_AUTHOR_IDENT" on an OS X system.
Before this patch it segfaults, and after we correctly
complain of the bogus "user@1.(none)" address (though this
bogus address would be suitable for non-object uses like
writing reflogs).
Reported-by: Jonas Thiel <jonas.lierschied@gmx.de>
Diagnosed-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Jeff King <peff@peff.net>
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 http://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 http://news.gmane.org/gmane.comp.version-control.git/, http://marc.info/?l=git and other archival sites.
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