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clone: leverage refspec transform

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This commit is contained in:
nulltoken 2012-09-26 19:22:21 +02:00
parent 3e012fca77
commit d280c71b8e
1 changed files with 74 additions and 19 deletions
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93
src/clone.c
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@ -73,21 +73,47 @@ struct head_info {
git_repository *repo;
git_oid remote_head_oid;
git_buf branchname;
const git_refspec *refspec;
};
static int reference_matches_remote_head(const char *head_name, void *payload)
static int reference_matches_remote_head(
const char *reference_name,
void *payload)
{
struct head_info *head_info = (struct head_info *)payload;
git_oid oid;
/* Stop looking if we've already found a match */
if (git_buf_len(&head_info->branchname) > 0) return 0;
/* TODO: Should we guard against references
* which name doesn't start with refs/heads/ ?
*/
if (!git_reference_name_to_oid(&oid, head_info->repo, head_name) &&
!git_oid_cmp(&head_info->remote_head_oid, &oid)) {
git_buf_puts(&head_info->branchname,
head_name+strlen(GIT_REFS_REMOTES_DIR "origin/"));
/* Stop looking if we've already found a match */
if (git_buf_len(&head_info->branchname) > 0)
return 0;
if (git_reference_name_to_oid(
&oid,
head_info->repo,
reference_name) < 0) {
/* TODO: How to handle not found references?
*/
return -1;
}
if (git_oid_cmp(&head_info->remote_head_oid, &oid) == 0) {
/* Determine the local reference name from the remote tracking one */
if (git_refspec_transform_l(
&head_info->branchname,
head_info->refspec,
reference_name) < 0)
return -1;
if (git_buf_sets(
&head_info->branchname,
git_buf_cstr(&head_info->branchname) + strlen(GIT_REFS_HEADS_DIR)) < 0)
return -1;
}
return 0;
}
@ -108,31 +134,60 @@ static int update_head_to_new_branch(git_repository *repo, const git_oid *target
static int update_head_to_remote(git_repository *repo, git_remote *remote)
{
int retcode = GIT_ERROR;
int retcode = -1;
git_remote_head *remote_head;
git_oid oid;
struct head_info head_info;
git_buf remote_master_name = GIT_BUF_INIT;
/* Get the remote's HEAD. This is always the first ref in remote->refs. */
remote_head = remote->refs.contents[0];
git_oid_cpy(&head_info.remote_head_oid, &remote_head->oid);
git_buf_init(&head_info.branchname, 16);
head_info.repo = repo;
head_info.refspec = git_remote_fetchspec(remote);
/* Determine the remote tracking reference name from the local master */
if (git_refspec_transform_r(
&remote_master_name,
head_info.refspec,
GIT_REFS_HEADS_MASTER_FILE) < 0)
return -1;
/* Check to see if "master" matches the remote head */
if (!git_reference_name_to_oid(&oid, repo, GIT_REFS_REMOTES_DIR "origin/master") &&
!git_oid_cmp(&remote_head->oid, &oid)) {
retcode = update_head_to_new_branch(repo, &oid, "master");
/* Check to see if the remote HEAD points to the remote master */
if (reference_matches_remote_head(git_buf_cstr(&remote_master_name), &head_info) < 0)
goto cleanup;
if (git_buf_len(&head_info.branchname) > 0) {
retcode = update_head_to_new_branch(
repo,
&head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
goto cleanup;
}
/* Not master. Check all the other refs. */
else if (!git_reference_foreach(repo, GIT_REF_LISTALL,
reference_matches_remote_head,
&head_info) &&
git_buf_len(&head_info.branchname) > 0) {
retcode = update_head_to_new_branch(repo, &head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
if (git_reference_foreach(
repo,
GIT_REF_LISTALL,
reference_matches_remote_head,
&head_info) < 0)
goto cleanup;
if (git_buf_len(&head_info.branchname) > 0) {
retcode = update_head_to_new_branch(
repo,
&head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
goto cleanup;
} else {
/* TODO: What should we do if nothing has been found?
*/
}
cleanup:
git_buf_free(&remote_master_name);
git_buf_free(&head_info.branchname);
return retcode;
}