parse_object: try internal cache before reading object db

diff --git a/builtin/branch.c b/builtin/branch.c
index e1e486e4c51194e09df3779be254cb72855d1103..7095718c13b5c4f39186548f5ed12198a3b9e609 100644 (file)
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -104,6 +104,7 @@ static int branch_merged(int kind, const char *name,
         */
        struct commit *reference_rev = NULL;
        const char *reference_name = NULL;
+       void *reference_name_to_free = NULL;
        int merged;
 
        if (kind == REF_LOCAL_BRANCH) {
@@ -114,11 +115,9 @@ static int branch_merged(int kind, const char *name,
                    branch->merge &&
                    branch->merge[0] &&
                    branch->merge[0]->dst &&
-                   (reference_name =
-                    resolve_ref(branch->merge[0]->dst, sha1, 1, NULL)) != NULL) {
-                       reference_name = xstrdup(reference_name);
+                   (reference_name = reference_name_to_free =
+                    resolve_refdup(branch->merge[0]->dst, sha1, 1, NULL)) != NULL)
                        reference_rev = lookup_commit_reference(sha1);
-               }
        }
        if (!reference_rev)
                reference_rev = head_rev;
@@ -143,7 +142,7 @@ static int branch_merged(int kind, const char *name,
                                "         '%s', even though it is merged to HEAD."),
                                name, reference_name);
        }
-       free((char *)reference_name);
+       free(reference_name_to_free);
        return merged;
 }
 
@@ -253,7 +252,7 @@ static char *resolve_symref(const char *src, const char *prefix)
        int flag;
        const char *dst, *cp;
 
-       dst = resolve_ref(src, sha1, 0, &flag);
+       dst = resolve_ref_unsafe(src, sha1, 0, &flag);
        if (!(dst && (flag & REF_ISSYMREF)))
                return NULL;
        if (prefix && (cp = skip_prefix(dst, prefix)))
@@ -570,6 +569,7 @@ static void rename_branch(const char *oldname, const char *newname, int force)
        struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
        struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
        int recovery = 0;
+       int clobber_head_ok;
 
        if (!oldname)
                die(_("cannot rename the current branch while not on any."));
@@ -585,7 +585,13 @@ static void rename_branch(const char *oldname, const char *newname, int force)
                        die(_("Invalid branch name: '%s'"), oldname);
        }
 
-       validate_new_branchname(newname, &newref, force, 0);
+       /*
+        * A command like "git branch -M currentbranch currentbranch" cannot
+        * cause the worktree to become inconsistent with HEAD, so allow it.
+        */
+       clobber_head_ok = !strcmp(oldname, newname);
+
+       validate_new_branchname(newname, &newref, force, clobber_head_ok);
 
        strbuf_addf(&logmsg, "Branch: renamed %s to %s",
                 oldref.buf, newref.buf);
@@ -731,10 +737,9 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
        track = git_branch_track;
 
-       head = resolve_ref("HEAD", head_sha1, 0, NULL);
+       head = resolve_refdup("HEAD", head_sha1, 0, NULL);
        if (!head)
                die(_("Failed to resolve HEAD as a valid ref."));
-       head = xstrdup(head);
        if (!strcmp(head, "HEAD")) {
                detached = 1;
        } else {
@@ -784,7 +789,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                if (kinds != REF_LOCAL_BRANCH)
                        die(_("-a and -r options to 'git branch' do not make sense with a branch name"));
                create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
-                             force_create, reflog, track);
+                             force_create, reflog, 0, track);
        } else
                usage_with_options(builtin_branch_usage, options);