Re: [PATCH 2/2] rebase.c: make sure current branch isn't moved when autostashing

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Hi Ben

I need to have a longer look at this (I don't understand why we're calling reset --hard after we've stashed the changes) but I notice that the test lines you're changing predate the switch to the builtin rebase so those changes are not related to the branch switching problem.

Best Wishes

Phillip

On 18/08/2019 10:53, Ben Wijen wrote:
The rebase --autostash incorrectly moved the current branch to orig_head, where
orig_head -- commit object name of tip of the branch before rebasing

It seems this was incorrectly taken over from git-legacy-rebase.sh

Signed-off-by: Ben Wijen <ben@xxxxxxxxx>
---
  builtin/rebase.c            | 18 ++++++------------
  t/t3420-rebase-autostash.sh |  4 ----
  2 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 670096c065..a928f44941 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1968,9 +1968,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  				state_dir_path("autostash", &options);
  			struct child_process stash = CHILD_PROCESS_INIT;
  			struct object_id oid;
-			struct commit *head =
-				lookup_commit_reference(the_repository,
-							&options.orig_head);
argv_array_pushl(&stash.args,
  					 "stash", "create", "autostash", NULL);
@@ -1991,17 +1988,14 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
  				    options.state_dir);
  			write_file(autostash, "%s", oid_to_hex(&oid));
  			printf(_("Created autostash: %s\n"), buf.buf);
-			if (reset_head(&head->object.oid, "reset --hard",
+
+			/*
+			 * We might not be on orig_head yet:
+			 * Make sure to reset w/o switching branches...
+			 */
+			if (reset_head(NULL, "reset --hard",
  				       NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
  				die(_("could not reset --hard"));
-			printf(_("HEAD is now at %s"),
-			       find_unique_abbrev(&head->object.oid,
-						  DEFAULT_ABBREV));
-			strbuf_reset(&buf);
-			pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
-			if (buf.len > 0)
-				printf(" %s", buf.buf);
-			putchar('\n');
if (discard_index(the_repository->index) < 0 ||
  				repo_read_index(the_repository) < 0)
diff --git a/t/t3420-rebase-autostash.sh b/t/t3420-rebase-autostash.sh
index 867e4e0b17..2ea1909881 100755
--- a/t/t3420-rebase-autostash.sh
+++ b/t/t3420-rebase-autostash.sh
@@ -37,7 +37,6 @@ test_expect_success setup '
  create_expected_success_am () {
  	cat >expected <<-EOF
  	$(grep "^Created autostash: [0-9a-f][0-9a-f]*\$" actual)
-	HEAD is now at $(git rev-parse --short feature-branch) third commit
  	First, rewinding head to replay your work on top of it...
  	Applying: second commit
  	Applying: third commit
@@ -48,7 +47,6 @@ create_expected_success_am () {
  create_expected_success_interactive () {
  	q_to_cr >expected <<-EOF
  	$(grep "^Created autostash: [0-9a-f][0-9a-f]*\$" actual)
-	HEAD is now at $(git rev-parse --short feature-branch) third commit
  	Applied autostash.
  	Successfully rebased and updated refs/heads/rebased-feature-branch.
  	EOF
@@ -57,7 +55,6 @@ create_expected_success_interactive () {
  create_expected_failure_am () {
  	cat >expected <<-EOF
  	$(grep "^Created autostash: [0-9a-f][0-9a-f]*\$" actual)
-	HEAD is now at $(git rev-parse --short feature-branch) third commit
  	First, rewinding head to replay your work on top of it...
  	Applying: second commit
  	Applying: third commit
@@ -70,7 +67,6 @@ create_expected_failure_am () {
  create_expected_failure_interactive () {
  	cat >expected <<-EOF
  	$(grep "^Created autostash: [0-9a-f][0-9a-f]*\$" actual)
-	HEAD is now at $(git rev-parse --short feature-branch) third commit
  	Applying autostash resulted in conflicts.
  	Your changes are safe in the stash.
  	You can run "git stash pop" or "git stash drop" at any time.




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