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guess default branch from HEAD

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This is a saner alternative than hardcoding the default branch to be
"master". The add_repo() function will now check for a symbolic ref in
repo_path/HEAD. If there is a suitable one, overwrite repo->defbranch
with it. Note that you'll need to strip the newline from the file (->
len-17).

If HEAD is a symbolic link pointing directly to a branch below
refs/heads/, do a readlink() instead to find the ref name.

Signed-off-by: Julius Plenz <plenz@cis.fu-berlin.de>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
This commit is contained in:
Julius Plenz 2011-04-07 12:59:24 +02:00 committed by Lars Hjemli
parent b0d72da028
commit d711de5528
2 changed files with 38 additions and 1 deletions
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3
cgitrc.5.txt
View File

@ -377,7 +377,8 @@ repo.commit-filter::
repo.defbranch::
The name of the default branch for this repository. If no such branch
exists in the repository, the first branch name (when sorted) is used
as default instead. Default value: "master".
as default instead. Default value: branch pointed to by HEAD, or
"master" if there is no suitable HEAD.
repo.desc::
The value to show as repository description. Default value: none.

36
scan-tree.c
View File

@ -68,6 +68,39 @@ static char *xstrrchr(char *s, char *from, int c)
return from < s ? NULL : from;
}
static char *guess_defbranch(const char *repo_path)
{
int fd, len;
char buffer[256];
char *ref_start;
char *head;
head = fmt("%s/HEAD", repo_path);
fd = open(head, O_RDONLY);
if (fd == -1)
return xstrdup("master");
memset(buffer, 0, sizeof(buffer));
len = read_in_full(fd, buffer, sizeof(buffer)-1);
close(fd);
if(!memcmp(buffer, "ref: refs/heads/", 16))
return xstrndup(buffer+16, len-17);
if(strlen(buffer) == 41) {
/* probably contains a SHA1 sum */
memset(buffer, 0, sizeof(buffer));
if(readlink(head, buffer, sizeof(buffer)-1)) {
ref_start = memmem(buffer, sizeof(buffer)-1, "refs/heads/", 11);
if(ref_start)
return xstrdup(ref_start+11);
}
}
return xstrdup("master");
}
static void add_repo(const char *base, const char *path, repo_config_fn fn)
{
struct stat st;
@ -105,6 +138,9 @@ static void add_repo(const char *base, const char *path, repo_config_fn fn)
*p = '\0';
repo->name = repo->url;
repo->path = xstrdup(path);
repo->defbranch = guess_defbranch(repo->path);
while (!owner) {
if ((pwd = getpwuid(st.st_uid)) == NULL) {
fprintf(stderr, "Error reading owner-info for %s: %s (%d)\n",