[PATCH v2 4/4] built-in rebase: set ORIG_HEAD just once, before the rebase
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Technically, the scripted version set ORIG_HEAD only in two spots (which really could have been one, because it called `git checkout $onto^0` to start the rebase and also if it could take a shortcut, and in both cases it called `git update-ref $orig_head`).
Practically, it *implicitly* reset ORIG_HEAD whenever `git reset --hard` was called.
However, what we really want is that it is set exactly once, at the beginning of the rebase.
So let's do that.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
builtin/rebase.c | 31 ++++++++++++++++++-------------
t/t3400-rebase.sh | 2 +-
2 files changed, 19 insertions(+), 14 deletions(-)
Show changes to 2 files +19 −14
builtin/rebase.c, t/t3400-rebase.sh
diff --git a/builtin/rebase.c b/builtin/rebase.c
index aa469ec964..0f4e1ead49 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -369,6 +369,7 @@ static void add_var(struct strbuf *buf, const char *name, const char *value)
#define RESET_HEAD_DETACH (1<<0)
#define RESET_HEAD_HARD (1<<1)
#define RESET_HEAD_REFS_ONLY (1<<2)
+#define RESET_ORIG_HEAD (1<<3)
static int reset_head(struct object_id *oid, const char *action,
const char *switch_to_branch, unsigned flags,
@@ -377,6 +378,7 @@ static int reset_head(struct object_id *oid, const char *action,
unsigned detach_head = flags & RESET_HEAD_DETACH;
unsigned reset_hard = flags & RESET_HEAD_HARD;
unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
+ unsigned update_orig_head = flags & RESET_ORIG_HEAD;
struct object_id head_oid;
struct tree_desc desc[2] = { { NULL }, { NULL } };
struct lock_file lock = LOCK_INIT;
@@ -453,18 +455,21 @@ static int reset_head(struct object_id *oid, const char *action,
strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
prefix_len = msg.len;
- if (!get_oid("ORIG_HEAD", &oid_old_orig))
- old_orig = &oid_old_orig;
- if (!get_oid("HEAD", &oid_orig)) {
- orig = &oid_orig;
- if (!reflog_orig_head) {
- strbuf_addstr(&msg, "updating ORIG_HEAD");
- reflog_orig_head = msg.buf;
- }
- update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
- UPDATE_REFS_MSG_ON_ERR);
- } else if (old_orig)
- delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
+ 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 (!reflog_orig_head) {
+ strbuf_addstr(&msg, "updating ORIG_HEAD");
+ reflog_orig_head = msg.buf;
+ }
+ update_ref(reflog_orig_head, "ORIG_HEAD", orig,
+ old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
+ } else if (old_orig)
+ delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
+ }
+
if (!reflog_head) {
strbuf_setlen(&msg, prefix_len);
strbuf_addstr(&msg, "updating HEAD");
@@ -1725,7 +1730,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
strbuf_addf(&msg, "%s: checkout %s",
getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
if (reset_head(&options.onto->object.oid, "checkout", NULL,
- RESET_HEAD_DETACH, NULL, msg.buf))
+ RESET_HEAD_DETACH | RESET_ORIG_HEAD, NULL, msg.buf))
die(_("Could not detach HEAD"));
strbuf_release(&msg);
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 7e8d5bb200..460d0523be 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -59,7 +59,7 @@ test_expect_success 'rebase against master' '
git rebase master
'
-test_expect_failure 'rebase sets ORIG_HEAD to pre-rebase state' '
+test_expect_success 'rebase sets ORIG_HEAD to pre-rebase state' '
git checkout -b orig-head topic &&
pre="$(git rev-parse --verify HEAD)" &&
git rebase master &&
--
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