From: Junio C Hamano <gits...@pobox.com>
strbuf_check_branch_ref() is the central place where many codepaths
see if a proposed name is suitable for the name of a branch. It was
designed to allow us to get stricter than the check_refname_format()
check used for refnames in general, and we already use it to reject
a branch whose name begins with a '-'.
Use it to also reject "HEAD" as a branch name.
Helped-by: Jeff King <p...@peff.net>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Kaartic Sivaraam <kaartic.sivar...@gmail.com>
---
Changes in v2:
* Fixed the issue of .git/HEAD being renamed when trying to do,
$ git branch -m HEAD head
This also allows to rename a branch named HEAD that was created by accident.
cf. <1509209933.2256.4.ca...@gmail.com>
* Added a test to ensure that it is possible to rename a branch named HEAD.
sha1_name.c | 8 +++++++-
t/t1430-bad-ref-name.sh | 29 +++++++++++++++++++++++++++++
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/sha1_name.c b/sha1_name.c
index 9a2d5caf3..657a060cb 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1438,9 +1438,15 @@ int strbuf_check_branch_ref(struct strbuf *sb, const
char *name)
strbuf_branchname(sb, name, INTERPRET_BRANCH_LOCAL);
else
strbuf_addstr(sb, name);
- if (name[0] == '-')
+ if (*name == '-')
return -1;
+
strbuf_splice(sb, 0, 0, "refs/heads/", 11);
+
+ /* HEAD is not to be used as a branch name */
+ if(!strcmp(sb->buf, "refs/heads/HEAD"))
+ return -1;
+
return check_refname_format(sb->buf, 0);
}
diff --git a/t/t1430-bad-ref-name.sh b/t/t1430-bad-ref-name.sh
index e88349c8a..421e80a7a 100755
--- a/t/t1430-bad-ref-name.sh
+++ b/t/t1430-bad-ref-name.sh
@@ -331,4 +331,33 @@ test_expect_success 'update-ref --stdin -z fails delete
with bad ref name' '
grep "fatal: invalid ref format: ~a" err
'
+test_expect_success 'branch rejects HEAD as a branch name' '
+ test_must_fail git branch HEAD HEAD^ &&
+ test_must_fail git show-ref refs/heads/HEAD
+'
+
+test_expect_success 'checkout -b rejects HEAD as a branch name' '
+ test_must_fail git checkout -B HEAD HEAD^ &&
+ test_must_fail git show-ref refs/heads/HEAD
+'
+
+test_expect_success 'update-ref can operate on refs/heads/HEAD' '
+ git update-ref refs/heads/HEAD HEAD^ &&
+ git show-ref refs/heads/HEAD &&
+ git update-ref -d refs/heads/HEAD &&
+ test_must_fail git show-ref refs/heads/HEAD
+'
+
+test_expect_success 'branch -d can remove refs/heads/HEAD' '
+ git update-ref refs/heads/HEAD HEAD^ &&
+ git branch -d HEAD &&
+ test_must_fail git show-ref refs/heads/HEAD
+'
+
+test_expect_success 'branch -m can rename refs/heads/HEAD' '
+ git update-ref refs/heads/HEAD HEAD^ &&
+ git branch -m HEAD head &&
+ test_must_fail git show-ref refs/heads/HEAD
+'
+
test_done
--
2.15.0.rc2.397.geff0134c7.dirty
