rebase: pass correct arguments to post-checkout hook
If a rebase started with "rebase [--apply|--merge] <upstream> <branch>"
detects that <upstream> is an ancestor of <branch> then it fast-forwards
and checks out <branch>. Unfortunately in that case it passed the null
oid as the first argument to the post-checkout hook rather than the oid
of HEAD.
A side effect of this change is that the call to update_ref() which
updates HEAD now always receives the old value of HEAD. This provides
protection against another process updating HEAD during the checkout.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/reset.c b/reset.c
index f214df3..315fef9 100644
--- a/reset.c
+++ b/reset.c
@@ -18,7 +18,7 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
unsigned update_orig_head = flags & RESET_ORIG_HEAD;
- struct object_id head_oid;
+ struct object_id *head = NULL, head_oid;
struct tree_desc desc[2] = { { NULL }, { NULL } };
struct lock_file lock = LOCK_INIT;
struct unpack_trees_options unpack_tree_opts = { 0 };
@@ -26,8 +26,7 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
const char *reflog_action;
struct strbuf msg = STRBUF_INIT;
size_t prefix_len;
- struct object_id *orig = NULL, oid_orig,
- *old_orig = NULL, oid_old_orig;
+ struct object_id *old_orig = NULL, oid_old_orig;
int ret = 0, nr = 0;
if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
@@ -38,7 +37,9 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
goto leave_reset_head;
}
- if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
+ if (!get_oid("HEAD", &head_oid)) {
+ head = &head_oid;
+ } else if (!oid || !reset_hard) {
ret = error(_("could not determine HEAD revision"));
goto leave_reset_head;
}
@@ -98,13 +99,12 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
if (update_orig_head) {
if (!get_oid("ORIG_HEAD", &oid_old_orig))
old_orig = &oid_old_orig;
- if (!get_oid("HEAD", &oid_orig)) {
- orig = &oid_orig;
+ if (head) {
if (!reflog_orig_head) {
strbuf_addstr(&msg, "updating ORIG_HEAD");
reflog_orig_head = msg.buf;
}
- update_ref(reflog_orig_head, "ORIG_HEAD", orig,
+ update_ref(reflog_orig_head, "ORIG_HEAD", head,
old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
} else if (old_orig)
delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
@@ -116,7 +116,7 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
reflog_head = msg.buf;
}
if (!switch_to_branch)
- ret = update_ref(reflog_head, "HEAD", oid, orig,
+ ret = update_ref(reflog_head, "HEAD", oid, head,
detach_head ? REF_NO_DEREF : 0,
UPDATE_REFS_MSG_ON_ERR);
else {
@@ -128,7 +128,7 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
}
if (run_hook)
run_hook_le(NULL, "post-checkout",
- oid_to_hex(orig ? orig : null_oid()),
+ oid_to_hex(head ? head : null_oid()),
oid_to_hex(oid), "1", NULL);
leave_reset_head:
