This is effective when a ref is updated from the super repository as
well as all linked repositories because "repos" directory is shared
between all repos.
We could even forbid a ref update if it's some repo's HEAD. But I'd
rather see a generic, permanent ref locking mechanism in place first
and make use of it.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
refs.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/refs.c b/refs.c
index 3691ef5..d856b1a 100644
--- a/refs.c
+++ b/refs.c
@@ -2462,6 +2462,41 @@ static int repack_without_ref(const char *refname)
return repack_without_refs(&refname, 1);
}
+static void detach_repos_refs(const char *refname, const unsigned char *sha1)
+{
+ struct dirent *d;
+ DIR *dir;
+
+ if (!strncmp(refname, "repos/", 6) ||
+ !strchr(refname, '/') ||
+ (dir = opendir(git_path("repos"))) == NULL)
+ return;
+
+ while ((d = readdir(dir)) != NULL) {
+ struct strbuf sb_ref = STRBUF_INIT;
+ unsigned char ref_sha1[20];
+ const char *ref;
+ int flags;
+
+ if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+ continue;
+ strbuf_addf(&sb_ref, "repos/%s/HEAD", d->d_name);
+ ref = resolve_ref_unsafe(sb_ref.buf, ref_sha1, 1, &flags);
+ if (flags & REF_ISSYMREF && ref && !strcmp(ref, refname)) {
+ struct strbuf msg = STRBUF_INIT;
+ strbuf_addf(&msg, "repos: detach from %s by %s",
+ ref, real_path(get_git_dir()));
+ update_ref(msg.buf, sb_ref.buf, sha1, NULL,
+ REF_NODEREF, DIE_ON_ERR);
+ strbuf_release(&msg);
+ warning(_("detach HEAD of linked repository %s from %s"),
+ d->d_name, refname);
+ }
+ strbuf_release(&sb_ref);
+ }
+ closedir(dir);
+}
+
static int delete_ref_loose(struct ref_lock *lock, int flag)
{
if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
@@ -2485,6 +2520,7 @@ int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag);
if (!lock)
return 1;
+ detach_repos_refs(lock->ref_name, lock->old_sha1);
ret |= delete_ref_loose(lock, flag);
/* removing the loose one could have resurrected an earlier
@@ -2790,6 +2826,7 @@ int write_ref_sha1(struct ref_lock *lock,
unlock_ref(lock);
return -1;
}
+ detach_repos_refs(lock->ref_name, lock->old_sha1);
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
write_in_full(lock->lock_fd, &term, 1) != 1
|| close_ref(lock) < 0) {
--
1.8.5.1.77.g42c48fa
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