mirror of
https://github.com/git/git.git
synced 2025-03-21 12:13:31 +00:00
ad66df2df1
Substitute the function path_relative in quote.c with the function
relative_path. Function relative_path can be treated as an enhanced
and more robust version of path_relative.
Outputs of path_relative and it's replacement (relative_path) are the
same for the following cases:
path prefix output of path_relative output of relative_path
======== ========= ======================= =======================
/a/b/c/ /a/b/ c/ c/
/a/b/c /a/b/ c c
/a/ /a/b/ ../ ../
/ /a/b/ ../../ ../../
/a/c /a/b/ ../c ../c
/x/y /a/b/ ../../x/y ../../x/y
a/b/c/ a/b/ c/ c/
a/ a/b/ ../ ../
x/y a/b/ ../../x/y ../../x/y
/a/b (empty) /a/b /a/b
/a/b (null) /a/b /a/b
a/b (empty) a/b a/b
a/b (null) a/b a/b
But if both of the path and the prefix are the same, or the returned
relative path should be the current directory, the outputs of both
functions are different. Function relative_path returns "./", while
function path_relative returns empty string.
path prefix output of path_relative output of relative_path
======== ========= ======================= =======================
/a/b/ /a/b/ (empty) ./
a/b/ a/b/ (empty) ./
(empty) (null) (empty) ./
(empty) (empty) (empty) ./
But the callers of path_relative can handle such cases, or never
encounter this issue at all, because:
* In function quote_path_relative, if the output of path_relative is
empty, append "./" to it, like:
if (!out->len)
strbuf_addstr(out, "./");
* Another caller is write_name_quoted_relative, which is only used
by builtin/ls-files.c. git-ls-files only show files, so path of
files will never be identical with the prefix of a directory.
The following differences show that path_relative does not handle
extra slashes properly:
path prefix output of path_relative output of relative_path
======== ========= ======================= =======================
/a//b//c/ //a/b// ../../../../a//b//c/ c/
a/b//c a//b ../b//c c
And if prefix has no trailing slash, path_relative does not work
properly either. But since prefix always has a trailing slash, it's
not a problem.
path prefix output of path_relative output of relative_path
======== ========= ======================= =======================
/a/b/c/ /a/b b/c/ c/
/a/b /a/b b ./
/a/b/ /a/b b/ ./
/a /a/b/ ../../a ../
a/b/c/ a/b b/c/ c/
a/b/ a/b b/ ./
a a/b ../a ../
x/y a/b/ ../x/y ../../x/y
a/c a/b c ../c
/a/ /a/b (empty) ../
(empty) /a/b ../../ ./
One tricky part in this conversion is write_name() function in
ls-files.c. It takes a counted string, <name, len>, that is to be
made relative to <prefix, prefix_len> and then quoted. Because
write_name_quoted_relative() still takes these two parameters as
counted string, but ignores the count and treat these two as
NUL-terminated strings, this conversion needs to be audited for its
callers:
- For <name, len>, all three callers of write_name() passes a
NUL-terminated string and its true length, so this patch makes
"len" unused.
- For <prefix, prefix_len>, prefix could be a string that is longer
than empty while prefix_len could be 0 when "--full-name" option
is used. This is fixed by checking prefix_len in write_name()
and calling write_name_quoted_relative() with NULL when
prefix_len is set to 0. Again, this makes "prefix_len" given to
write_name_quoted_relative() unused, without introducing a bug.
Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
////////////////////////////////////////////////////////////////
Git - the stupid content tracker
////////////////////////////////////////////////////////////////
"git" can mean anything, 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
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.
See Documentation/gittutorial.txt to get started, then see
Documentation/everyday.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).
Many Git online resources are accessible from http://git-scm.com/
including full documentation and Git related tools.
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.