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From: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
To: gitster@pobox.com
Cc: git@vger.kernel.org, Jeff King <peff@peff.net>
Subject: [PATCH v2 1/2] branch: forbid refs/heads/HEAD
Date: Tue, 14 Nov 2017 17:12:58 +0530
Message-ID: <20171114114259.8937-1-kaartic.sivaraam@gmail.com> (raw)
In-Reply-To: <20171013051132.3973-1-gitster@pobox.com>

From: Junio C Hamano <gitster@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 <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@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.camel@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


  parent reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-13  5:11 [PATCH 0/3] a small branch API clean-up Junio C Hamano
2017-10-13  5:11 ` [PATCH 1/3] branch: streamline "attr_only" handling in validate_new_branchname() Junio C Hamano
2017-10-13  7:05   ` Eric Sunshine
2017-10-13  5:11 ` [PATCH 2/3] branch: split validate_new_branchname() into two Junio C Hamano
2017-10-21  4:58   ` Kaartic Sivaraam
2017-10-21  9:01     ` Junio C Hamano
2017-10-13  5:11 ` [PATCH 3/3] branch: forbid refs/heads/HEAD Junio C Hamano
2017-10-13 13:15   ` Jeff King
2017-10-14  2:11     ` Junio C Hamano
2017-10-14  2:20       ` Junio C Hamano
2017-10-16 21:38         ` Jeff King
2017-10-21  4:50         ` Kaartic Sivaraam
2017-10-21  8:57           ` Junio C Hamano
2017-10-22  5:00             ` Kaartic Sivaraam
2017-10-21  3:07 ` [PATCH 0/3] a small branch API clean-up Kaartic Sivaraam
2017-10-21  8:52   ` Junio C Hamano
2017-10-22  4:36     ` Kaartic Sivaraam
2017-11-14 11:42 ` Kaartic Sivaraam [this message]
2017-11-14 11:42   ` [PATCH v2 2/2] builtin/branch: remove redundant check for HEAD Kaartic Sivaraam
2017-11-14 12:00   ` [PATCH v2 1/2] branch: forbid refs/heads/HEAD Kaartic Sivaraam
2017-11-14 15:08     ` Junio C Hamano
2017-11-15 16:59       ` Kaartic Sivaraam
2017-11-15 22:14         ` [PATCH 3/4] branch: correctly reject refs/heads/{-dash,HEAD} Junio C Hamano
2017-11-16 13:11           ` Kaartic Sivaraam
2017-11-16 14:57             ` Junio C Hamano
2017-11-16 17:02               ` Kaartic Sivaraam

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