From 692654dca01dda9951a81de4ecfa958b61b8bc5c Mon Sep 17 00:00:00 2001
From: =?utf8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Tue, 5 Jan 2021 20:42:42 +0100
Subject: [PATCH] mktag tests: test verify_object() with replaced objects
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

Add tests to demonstrate what "mktag" does in the face of replaced
objects.

There was an existing test for replaced objects fed to "mktag" added
in cc400f50112 (mktag: call "check_sha1_signature" with the
replacement sha1, 2009-01-23), but that one only tests a
commit->commit mapping. Not a mapping to a different type as like
we're also testing for here. We could remove the "mktag" test in
t6050-replace.sh now if the created tag wasn't being used by a
subsequent "fsck" test.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t3800-mktag.sh | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/t/t3800-mktag.sh b/t/t3800-mktag.sh
index 1cc382dc8b..8bf0e88115 100755
--- a/t/t3800-mktag.sh
+++ b/t/t3800-mktag.sh
@@ -38,7 +38,11 @@ test_expect_mktag_success() {
 # for the tag.
 test_expect_success 'setup' '
 	test_commit A &&
-	head=$(git rev-parse --verify HEAD)
+	test_commit B &&
+	head=$(git rev-parse --verify HEAD) &&
+	head_parent=$(git rev-parse --verify HEAD~) &&
+	tree=$(git rev-parse HEAD^{tree}) &&
+	blob=$(git rev-parse --verify HEAD:B.t)
 '
 
 ############################################################
@@ -180,6 +184,35 @@ tagger . <> 0 +0000
 
 EOF
 
+check_verify_failure 'verify object (hash/type) check -- mismatched type, valid object' \
+	'^error: char7: could not verify object'
+
+############################################################
+#  9.5. verify object (hash/type) check -- replacement
+
+test_expect_success 'setup replacement of commit -> commit and tree -> blob' '
+	git replace $head_parent $head &&
+	git replace -f $tree $blob
+'
+
+cat >tag.sig <<EOF
+object $head_parent
+type commit
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+test_expect_mktag_success 'tag to a commit replaced by another commit'
+
+cat >tag.sig <<EOF
+object $tree
+type tree
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
 check_verify_failure 'verify object (hash/type) check -- mismatched type, valid object' \
 	'^error: char7: could not verify object'
 
-- 
2.47.2