t9301: Add 2nd testcase exposing bugs in fast-import's notes fanout handling

diff --git a/branch.c b/branch.c
index d62cc0132cbff6de04b69864279d6c92f9e95e0a..025a97be0281b9fd3ccff2b36c03495b005ac4fe 100644 (file)
--- a/branch.c
+++ b/branch.c
@@ -3,6 +3,7 @@
 #include "refs.h"
 #include "remote.h"
 #include "commit.h"
+#include "sequencer.h"
 
 struct tracking {
        struct refspec spec;
@@ -135,6 +136,28 @@ static int setup_tracking(const char *new_ref, const char *orig_ref,
        return 0;
 }
 
+int validate_new_branchname(const char *name, struct strbuf *ref,
+                           int force, int attr_only)
+{
+       if (strbuf_check_branch_ref(ref, name))
+               die("'%s' is not a valid branch name.", name);
+
+       if (!ref_exists(ref->buf))
+               return 0;
+       else if (!force && !attr_only)
+               die("A branch named '%s' already exists.", ref->buf + strlen("refs/heads/"));
+
+       if (!attr_only) {
+               const char *head;
+               unsigned char sha1[20];
+
+               head = resolve_ref("HEAD", sha1, 0, NULL);
+               if (!is_bare_repository() && head && !strcmp(head, ref->buf))
+                       die("Cannot force update the current branch.");
+       }
+       return 1;
+}
+
 void create_branch(const char *head,
                   const char *name, const char *start_name,
                   int force, int reflog, enum branch_track track)
@@ -151,17 +174,12 @@ void create_branch(const char *head,
        if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
                explicit_tracking = 1;
 
-       if (strbuf_check_branch_ref(&ref, name))
-               die("'%s' is not a valid branch name.", name);
-
-       if (resolve_ref(ref.buf, sha1, 1, NULL)) {
-               if (!force && track == BRANCH_TRACK_OVERRIDE)
+       if (validate_new_branchname(name, &ref, force,
+                                   track == BRANCH_TRACK_OVERRIDE)) {
+               if (!force)
                        dont_change_ref = 1;
-               else if (!force)
-                       die("A branch named '%s' already exists.", name);
-               else if (!is_bare_repository() && head && !strcmp(head, name))
-                       die("Cannot force update the current branch.");
-               forcing = 1;
+               else
+                       forcing = 1;
        }
 
        real_ref = NULL;
@@ -223,9 +241,11 @@ void create_branch(const char *head,
 void remove_branch_state(void)
 {
        unlink(git_path("CHERRY_PICK_HEAD"));
+       unlink(git_path("REVERT_HEAD"));
        unlink(git_path("MERGE_HEAD"));
        unlink(git_path("MERGE_RR"));
        unlink(git_path("MERGE_MSG"));
        unlink(git_path("MERGE_MODE"));
        unlink(git_path("SQUASH_MSG"));
+       remove_sequencer_state(0);
 }