fast-import: prevent producing bad delta

diff --git a/branch.c b/branch.c
index 9e1f63ed8dbe8b087f99292880059642d9744697..c0c865a4b1b0fca038f32b77f2239d7987438ff5 100644 (file)
--- a/branch.c
+++ b/branch.c
@@ -159,7 +159,7 @@ void create_branch(const char *head,
                        dont_change_ref = 1;
                else if (!force)
                        die("A branch named '%s' already exists.", name);
-               else if (!is_bare_repository() && !strcmp(head, name))
+               else if (!is_bare_repository() && head && !strcmp(head, name))
                        die("Cannot force update the current branch.");
                forcing = 1;
        }
@@ -175,9 +175,14 @@ void create_branch(const char *head,
                        die("Cannot setup tracking information; starting point is not a branch.");
                break;
        case 1:
-               /* Unique completion -- good, only if it is a real ref */
-               if (explicit_tracking && !strcmp(real_ref, "HEAD"))
-                       die("Cannot setup tracking information; starting point is not a branch.");
+               /* Unique completion -- good, only if it is a real branch */
+               if (prefixcmp(real_ref, "refs/heads/") &&
+                   prefixcmp(real_ref, "refs/remotes/")) {
+                       if (explicit_tracking)
+                               die("Cannot setup tracking information; starting point is not a branch.");
+                       else
+                               real_ref = NULL;
+               }
                break;
        default:
                die("Ambiguous object name: '%s'.", start_name);
@@ -198,7 +203,7 @@ void create_branch(const char *head,
                log_all_ref_updates = 1;
 
        if (forcing)
-               snprintf(msg, sizeof msg, "branch: Reset from %s",
+               snprintf(msg, sizeof msg, "branch: Reset to %s",
                         start_name);
        else if (!dont_change_ref)
                snprintf(msg, sizeof msg, "branch: Created from %s",
@@ -217,6 +222,7 @@ void create_branch(const char *head,
 
 void remove_branch_state(void)
 {
+       unlink(git_path("CHERRY_PICK_HEAD"));
        unlink(git_path("MERGE_HEAD"));
        unlink(git_path("MERGE_RR"));
        unlink(git_path("MERGE_MSG"));