branch: allow a no-op "branch -M <current-branch> HEAD"

Overwriting the current branch with a different commit is forbidden, as it
will make the status recorded in the index and the working tree out of
sync with respect to the HEAD. There however is no reason to forbid it if
the current branch is renamed to itself, which admittedly is something
only an insane user would do, but is handy for scripts.

Test script is by Conrad Irwin.

Reported-by: Soeren Sonnenburg <sonne@debian.org>
Reported-by: Josh Chia (谢任中)
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Conrad Irwin <conrad.irwin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/branch.c b/builtin/branch.c
index 51ca6a02d7433f1394de10a7f6ef1aa565ac03e2..24f33b241eb019d6e75485f8a540d5d8123c36d2 100644 (file)
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -568,6 +568,7 @@ static void rename_branch(const char *oldname, const char *newname, int force)
        unsigned char sha1[20];
        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."));
@@ -583,7 +584,13 @@ 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);

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index bc73c2099b5069ab136a1d93aef5a8ab4a0dad1f..76903323af37ed1a96b5a11c27eb1e9d63a0e9ef 100755 (executable)
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -115,6 +115,22 @@ test_expect_success 'git branch -M baz bam should succeed when baz is checked ou
        git branch -M baz bam
 '
 
+test_expect_success 'git branch -M master should work when master is checked out' '
+       git checkout master &&
+       git branch -M master
+'
+
+test_expect_success 'git branch -M master master should work when master is checked out' '
+       git checkout master &&
+       git branch -M master master
+'
+
+test_expect_success 'git branch -M master2 master2 should work when master is checked out' '
+       git checkout master &&
+       git branch master2 &&
+       git branch -M master2 master2
+'
+
 test_expect_success 'git branch -v -d t should work' '
        git branch t &&
        test_path_is_file .git/refs/heads/t &&