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Add platform-independent .git "symlink"

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This patch allows .git to be a regular textfile containing the path of
the real git directory (prefixed with "gitdir: "), which can be useful on
platforms lacking support for real symlinks.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Hjemli
2008-02-20 23:13:13 +01:00
committed by Junio C Hamano
parent 2a5fe25458
commit b44ebb19e3
5 changed files with 157 additions and 1 deletions
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47
setup.c
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@ -314,6 +314,44 @@ static int check_repository_format_gently(int *nongit_ok)
return 0;
}
/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
*/
const char *read_gitfile_gently(const char *path)
{
char *buf;
struct stat st;
int fd;
size_t len;
if (stat(path, &st))
return NULL;
if (!S_ISREG(st.st_mode))
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0)
die("Error opening %s: %s", path, strerror(errno));
buf = xmalloc(st.st_size + 1);
len = read_in_full(fd, buf, st.st_size);
close(fd);
if (len != st.st_size)
die("Error reading %s", path);
buf[len] = '\0';
if (prefixcmp(buf, "gitdir: "))
die("Invalid gitfile format: %s", path);
while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
len--;
if (len < 9)
die("No path in gitfile: %s", path);
buf[len] = '\0';
if (!is_git_directory(buf + 8))
die("Not a git repository: %s", buf + 8);
path = make_absolute_path(buf + 8);
free(buf);
return path;
}
/*
* We cannot decide in this function whether we are in the work tree or
* not, since the config can only be read _after_ this function was called.
@ -323,6 +361,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
static char cwd[PATH_MAX+1];
const char *gitdirenv;
const char *gitfile_dir;
int len, offset;
/*
@ -377,8 +416,10 @@ const char *setup_git_directory_gently(int *nongit_ok)
/*
* Test in the following order (relative to the cwd):
* - .git (file containing "gitdir: <path>")
* - .git/
* - ./ (bare)
* - ../.git
* - ../.git/
* - ../ (bare)
* - ../../.git/
@ -386,6 +427,12 @@ const char *setup_git_directory_gently(int *nongit_ok)
*/
offset = len = strlen(cwd);
for (;;) {
gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
if (gitfile_dir) {
if (set_git_dir(gitfile_dir))
die("Repository setup failed");
break;
}
if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
break;
if (is_git_directory(".")) {