git-svn: correctly track diff-less copies with do_switch

diff --git a/builtin-branch.c b/builtin-branch.c
index 487965b54070c3b9313f2b843a5194bae913e084..d0179b00a2f78ddf875cf7ea98e712b152664e94 100644 (file)
--- a/builtin-branch.c
+++ b/builtin-branch.c
@@ -59,7 +59,7 @@ int git_branch_config(const char *var, const char *value)
                branch_use_color = git_config_colorbool(var, value);
                return 0;
        }
-       if (!strncmp(var, "color.branch.", 13)) {
+       if (!prefixcmp(var, "color.branch.")) {
                int slot = parse_branch_color_slot(var, 13);
                color_parse(value, var, branch_colors[slot]);
                return 0;
@@ -134,7 +134,7 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
                 */
 
                if (!force &&
-                   !in_merge_bases(rev, head_rev)) {
+                   !in_merge_bases(rev, &head_rev, 1)) {
                        error("The branch '%s' is not a strict subset of "
                                "your current HEAD.\n"
                                "If you are sure you want to delete it, "
@@ -178,13 +178,13 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
        int len;
 
        /* Detect kind */
-       if (!strncmp(refname, "refs/heads/", 11)) {
+       if (!prefixcmp(refname, "refs/heads/")) {
                kind = REF_LOCAL_BRANCH;
                refname += 11;
-       } else if (!strncmp(refname, "refs/remotes/", 13)) {
+       } else if (!prefixcmp(refname, "refs/remotes/")) {
                kind = REF_REMOTE_BRANCH;
                refname += 13;
-       } else if (!strncmp(refname, "refs/tags/", 10)) {
+       } else if (!prefixcmp(refname, "refs/tags/")) {
                kind = REF_TAG;
                refname += 10;
        }
@@ -308,13 +308,15 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
        free_ref_list(&ref_list);
 }
 
-static void create_branch(const char *name, const char *start,
+static void create_branch(const char *name, const char *start_name,
+                         unsigned char *start_sha1,
                          int force, int reflog)
 {
        struct ref_lock *lock;
        struct commit *commit;
        unsigned char sha1[20];
        char ref[PATH_MAX], msg[PATH_MAX + 20];
+       int forcing = 0;
 
        snprintf(ref, sizeof ref, "refs/heads/%s", name);
        if (check_ref_format(ref))
@@ -323,23 +325,34 @@ static void create_branch(const char *name, const char *start,
        if (resolve_ref(ref, sha1, 1, NULL)) {
                if (!force)
                        die("A branch named '%s' already exists.", name);
-               else if (!strcmp(head, name))
+               else if (!is_bare_repository() && !strcmp(head, name))
                        die("Cannot force update the current branch.");
+               forcing = 1;
        }
 
-       if (get_sha1(start, sha1) ||
-           (commit = lookup_commit_reference(sha1)) == NULL)
-               die("Not a valid branch point: '%s'.", start);
+       if (start_sha1)
+               /* detached HEAD */
+               hashcpy(sha1, start_sha1);
+       else if (get_sha1(start_name, sha1))
+               die("Not a valid object name: '%s'.", start_name);
+
+       if ((commit = lookup_commit_reference(sha1)) == NULL)
+               die("Not a valid branch point: '%s'.", start_name);
        hashcpy(sha1, commit->object.sha1);
 
        lock = lock_any_ref_for_update(ref, NULL);
        if (!lock)
                die("Failed to lock ref for update: %s.", strerror(errno));
 
-       if (reflog) {
+       if (reflog)
                log_all_ref_updates = 1;
-               snprintf(msg, sizeof msg, "branch: Created from %s", start);
-       }
+
+       if (forcing)
+               snprintf(msg, sizeof msg, "branch: Reset from %s",
+                        start_name);
+       else
+               snprintf(msg, sizeof msg, "branch: Created from %s",
+                        start_name);
 
        if (write_ref_sha1(lock, sha1, msg) < 0)
                die("Failed to write ref: %s.", strerror(errno));
@@ -350,6 +363,9 @@ static void rename_branch(const char *oldname, const char *newname, int force)
        char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
        unsigned char sha1[20];
 
+       if (!oldname)
+               die("cannot rename the current branch while not on any.");
+
        if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
                die("Old branchname too long");
 
@@ -371,7 +387,8 @@ static void rename_branch(const char *oldname, const char *newname, int force)
        if (rename_ref(oldref, newref, logmsg))
                die("Branch rename failed");
 
-       if (!strcmp(oldname, head) && create_symref("HEAD", newref))
+       /* no need to pass logmsg here as HEAD didn't really move */
+       if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
                die("Branch renamed to %s, but HEAD is not updated!", newname);
 }
 
@@ -384,7 +401,6 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
        int kinds = REF_LOCAL_BRANCH;
        int i;
 
-       setup_ident();
        git_config(git_branch_config);
 
        for (i = 1; i < argc; i++) {
@@ -430,7 +446,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                        reflog = 1;
                        continue;
                }
-               if (!strncmp(arg, "--abbrev=", 9)) {
+               if (!prefixcmp(arg, "--abbrev=")) {
                        abbrev = atoi(arg+9);
                        continue;
                }
@@ -460,7 +476,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                detached = 1;
        }
        else {
-               if (strncmp(head, "refs/heads/", 11))
+               if (prefixcmp(head, "refs/heads/"))
                        die("HEAD not found below refs/heads!");
                head += 11;
        }
@@ -474,9 +490,9 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
        else if (rename && (i == argc - 2))
                rename_branch(argv[i], argv[i + 1], force_rename);
        else if (i == argc - 1)
-               create_branch(argv[i], head, force_create, reflog);
+               create_branch(argv[i], head, head_sha1, force_create, reflog);
        else if (i == argc - 2)
-               create_branch(argv[i], argv[i + 1], force_create, reflog);
+               create_branch(argv[i], argv[i+1], NULL, force_create, reflog);
        else
                usage(builtin_branch_usage);