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Add support for GIT_CEILING_DIRECTORIES

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Make git recognize a new environment variable that prevents it from
chdir'ing up into specified directories when looking for a GIT_DIR.
Useful for avoiding slow network directories.

For example, I use git in an environment where homedirs are automounted
and "ls /home/nonexistent" takes about 9 seconds.  Setting
GIT_CEILING_DIRS="/home" allows "git help -a" (for bash completion) and
"git symbolic-ref" (for my shell prompt) to run in a reasonable time.

Signed-off-by: David Reiss <dreiss@facebook.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Reiss
2008-05-19 23:49:26 -07:00
committed by Junio C Hamano
parent d553e73789
commit 0454dd93bf
8 changed files with 282 additions and 11 deletions
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24
setup.c
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@ -359,10 +359,11 @@ const char *read_gitfile_gently(const char *path)
const char *setup_git_directory_gently(int *nongit_ok)
{
const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
static char cwd[PATH_MAX+1];
const char *gitdirenv;
const char *gitfile_dir;
int len, offset;
int len, offset, ceil_offset;
/*
* Let's assume that we are in a git repository.
@ -414,6 +415,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
if (!getcwd(cwd, sizeof(cwd)-1))
die("Unable to read current working directory");
ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
/*
* Test in the following order (relative to the cwd):
* - .git (file containing "gitdir: <path>")
@ -444,17 +447,16 @@ const char *setup_git_directory_gently(int *nongit_ok)
return NULL;
}
chdir("..");
do {
if (!offset) {
if (nongit_ok) {
if (chdir(cwd))
die("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
die("Not a git repository");
while (--offset > ceil_offset && cwd[offset] != '/');
if (offset <= ceil_offset) {
if (nongit_ok) {
if (chdir(cwd))
die("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
} while (cwd[--offset] != '/');
die("Not a git repository");
}
}
inside_git_dir = 0;