merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 1393 insertions, 0 deletions

diff --git a/third_party/git/t/t1400-update-ref.sh b/third_party/git/t/t1400-update-ref.sh
new file mode 100755
index 000000000000..1fbd94040818
--- /dev/null
+++ b/third_party/git/t/t1400-update-ref.sh
@@ -0,0 +1,1393 @@
+#!/bin/sh
+#
+# Copyright (c) 2006 Shawn Pearce
+#
+
+test_description='Test git update-ref and basic ref logging'
+. ./test-lib.sh
+
+Z=$ZERO_OID
+
+m=refs/heads/master
+n_dir=refs/heads/gu
+n=$n_dir/fixes
+outside=refs/foo
+bare=bare-repo
+
+create_test_commits ()
+{
+	prfx="$1"
+	for name in A B C D E F
+	do
+		test_tick &&
+		T=$(git write-tree) &&
+		sha1=$(echo $name | git commit-tree $T) &&
+		eval $prfx$name=$sha1
+	done
+}
+
+test_expect_success setup '
+	create_test_commits "" &&
+	mkdir $bare &&
+	cd $bare &&
+	git init --bare &&
+	create_test_commits "bare" &&
+	cd -
+'
+
+test_expect_success "create $m" '
+	git update-ref $m $A &&
+	test $A = $(cat .git/$m)
+'
+test_expect_success "create $m with oldvalue verification" '
+	git update-ref $m $B $A &&
+	test $B = $(cat .git/$m)
+'
+test_expect_success "fail to delete $m with stale ref" '
+	test_must_fail git update-ref -d $m $A &&
+	test $B = "$(cat .git/$m)"
+'
+test_expect_success "delete $m" '
+	test_when_finished "rm -f .git/$m" &&
+	git update-ref -d $m $B &&
+	test_path_is_missing .git/$m
+'
+
+test_expect_success "delete $m without oldvalue verification" '
+	test_when_finished "rm -f .git/$m" &&
+	git update-ref $m $A &&
+	test $A = $(cat .git/$m) &&
+	git update-ref -d $m &&
+	test_path_is_missing .git/$m
+'
+
+test_expect_success "fail to create $n" '
+	test_when_finished "rm -f .git/$n_dir" &&
+	touch .git/$n_dir &&
+	test_must_fail git update-ref $n $A
+'
+
+test_expect_success "create $m (by HEAD)" '
+	git update-ref HEAD $A &&
+	test $A = $(cat .git/$m)
+'
+test_expect_success "create $m (by HEAD) with oldvalue verification" '
+	git update-ref HEAD $B $A &&
+	test $B = $(cat .git/$m)
+'
+test_expect_success "fail to delete $m (by HEAD) with stale ref" '
+	test_must_fail git update-ref -d HEAD $A &&
+	test $B = $(cat .git/$m)
+'
+test_expect_success "delete $m (by HEAD)" '
+	test_when_finished "rm -f .git/$m" &&
+	git update-ref -d HEAD $B &&
+	test_path_is_missing .git/$m
+'
+
+test_expect_success "deleting current branch adds message to HEAD's log" '
+	test_when_finished "rm -f .git/$m" &&
+	git update-ref $m $A &&
+	git symbolic-ref HEAD $m &&
+	git update-ref -m delete-$m -d $m &&
+	test_path_is_missing .git/$m &&
+	grep "delete-$m$" .git/logs/HEAD
+'
+
+test_expect_success "deleting by HEAD adds message to HEAD's log" '
+	test_when_finished "rm -f .git/$m" &&
+	git update-ref $m $A &&
+	git symbolic-ref HEAD $m &&
+	git update-ref -m delete-by-head -d HEAD &&
+	test_path_is_missing .git/$m &&
+	grep "delete-by-head$" .git/logs/HEAD
+'
+
+test_expect_success 'update-ref does not create reflogs by default' '
+	test_when_finished "git update-ref -d $outside" &&
+	git update-ref $outside $A &&
+	git rev-parse $A >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	test_must_fail git reflog exists $outside
+'
+
+test_expect_success 'update-ref creates reflogs with --create-reflog' '
+	test_when_finished "git update-ref -d $outside" &&
+	git update-ref --create-reflog $outside $A &&
+	git rev-parse $A >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	git reflog exists $outside
+'
+
+test_expect_success 'creates no reflog in bare repository' '
+	git -C $bare update-ref $m $bareA &&
+	git -C $bare rev-parse $bareA >expect &&
+	git -C $bare rev-parse $m >actual &&
+	test_cmp expect actual &&
+	test_must_fail git -C $bare reflog exists $m
+'
+
+test_expect_success 'core.logAllRefUpdates=true creates reflog in bare repository' '
+	test_when_finished "git -C $bare config --unset core.logAllRefUpdates && \
+		rm $bare/logs/$m" &&
+	git -C $bare config core.logAllRefUpdates true &&
+	git -C $bare update-ref $m $bareB &&
+	git -C $bare rev-parse $bareB >expect &&
+	git -C $bare rev-parse $m >actual &&
+	test_cmp expect actual &&
+	git -C $bare reflog exists $m
+'
+
+test_expect_success 'core.logAllRefUpdates=true does not create reflog by default' '
+	test_config core.logAllRefUpdates true &&
+	test_when_finished "git update-ref -d $outside" &&
+	git update-ref $outside $A &&
+	git rev-parse $A >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	test_must_fail git reflog exists $outside
+'
+
+test_expect_success 'core.logAllRefUpdates=always creates reflog by default' '
+	test_config core.logAllRefUpdates always &&
+	test_when_finished "git update-ref -d $outside" &&
+	git update-ref $outside $A &&
+	git rev-parse $A >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	git reflog exists $outside
+'
+
+test_expect_success 'core.logAllRefUpdates=always creates no reflog for ORIG_HEAD' '
+	test_config core.logAllRefUpdates always &&
+	git update-ref ORIG_HEAD $A &&
+	test_must_fail git reflog exists ORIG_HEAD
+'
+
+test_expect_success '--no-create-reflog overrides core.logAllRefUpdates=always' '
+	test_config core.logAllRefUpdates true &&
+	test_when_finished "git update-ref -d $outside" &&
+	git update-ref --no-create-reflog $outside $A &&
+	git rev-parse $A >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	test_must_fail git reflog exists $outside
+'
+
+test_expect_success "create $m (by HEAD)" '
+	git update-ref HEAD $A &&
+	test $A = $(cat .git/$m)
+'
+test_expect_success 'pack refs' '
+	git pack-refs --all
+'
+test_expect_success "move $m (by HEAD)" '
+	git update-ref HEAD $B $A &&
+	test $B = $(cat .git/$m)
+'
+test_expect_success "delete $m (by HEAD) should remove both packed and loose $m" '
+	test_when_finished "rm -f .git/$m" &&
+	git update-ref -d HEAD $B &&
+	! grep "$m" .git/packed-refs &&
+	test_path_is_missing .git/$m
+'
+
+cp -f .git/HEAD .git/HEAD.orig
+test_expect_success 'delete symref without dereference' '
+	test_when_finished "cp -f .git/HEAD.orig .git/HEAD" &&
+	git update-ref --no-deref -d HEAD &&
+	test_path_is_missing .git/HEAD
+'
+
+test_expect_success 'delete symref without dereference when the referred ref is packed' '
+	test_when_finished "cp -f .git/HEAD.orig .git/HEAD" &&
+	echo foo >foo.c &&
+	git add foo.c &&
+	git commit -m foo &&
+	git pack-refs --all &&
+	git update-ref --no-deref -d HEAD &&
+	test_path_is_missing .git/HEAD
+'
+
+git update-ref -d $m
+
+test_expect_success 'update-ref -d is not confused by self-reference' '
+	git symbolic-ref refs/heads/self refs/heads/self &&
+	test_when_finished "rm -f .git/refs/heads/self" &&
+	test_path_is_file .git/refs/heads/self &&
+	test_must_fail git update-ref -d refs/heads/self &&
+	test_path_is_file .git/refs/heads/self
+'
+
+test_expect_success 'update-ref --no-deref -d can delete self-reference' '
+	git symbolic-ref refs/heads/self refs/heads/self &&
+	test_when_finished "rm -f .git/refs/heads/self" &&
+	test_path_is_file .git/refs/heads/self &&
+	git update-ref --no-deref -d refs/heads/self &&
+	test_path_is_missing .git/refs/heads/self
+'
+
+test_expect_success 'update-ref --no-deref -d can delete reference to bad ref' '
+	>.git/refs/heads/bad &&
+	test_when_finished "rm -f .git/refs/heads/bad" &&
+	git symbolic-ref refs/heads/ref-to-bad refs/heads/bad &&
+	test_when_finished "rm -f .git/refs/heads/ref-to-bad" &&
+	test_path_is_file .git/refs/heads/ref-to-bad &&
+	git update-ref --no-deref -d refs/heads/ref-to-bad &&
+	test_path_is_missing .git/refs/heads/ref-to-bad
+'
+
+test_expect_success '(not) create HEAD with old sha1' '
+	test_must_fail git update-ref HEAD $A $B
+'
+test_expect_success "(not) prior created .git/$m" '
+	test_when_finished "rm -f .git/$m" &&
+	test_path_is_missing .git/$m
+'
+
+test_expect_success 'create HEAD' '
+	git update-ref HEAD $A
+'
+test_expect_success '(not) change HEAD with wrong SHA1' '
+	test_must_fail git update-ref HEAD $B $Z
+'
+test_expect_success "(not) changed .git/$m" '
+	test_when_finished "rm -f .git/$m" &&
+	! test $B = $(cat .git/$m)
+'
+
+rm -f .git/logs/refs/heads/master
+test_expect_success "create $m (logged by touch)" '
+	test_config core.logAllRefUpdates false &&
+	GIT_COMMITTER_DATE="2005-05-26 23:30" \
+	git update-ref --create-reflog HEAD $A -m "Initial Creation" &&
+	test $A = $(cat .git/$m)
+'
+test_expect_success "update $m (logged by touch)" '
+	test_config core.logAllRefUpdates false &&
+	GIT_COMMITTER_DATE="2005-05-26 23:31" \
+	git update-ref HEAD $B $A -m "Switch" &&
+	test $B = $(cat .git/$m)
+'
+test_expect_success "set $m (logged by touch)" '
+	test_config core.logAllRefUpdates false &&
+	GIT_COMMITTER_DATE="2005-05-26 23:41" \
+	git update-ref HEAD $A &&
+	test $A = $(cat .git/$m)
+'
+
+test_expect_success 'empty directory removal' '
+	git branch d1/d2/r1 HEAD &&
+	git branch d1/r2 HEAD &&
+	test_path_is_file .git/refs/heads/d1/d2/r1 &&
+	test_path_is_file .git/logs/refs/heads/d1/d2/r1 &&
+	git branch -d d1/d2/r1 &&
+	test_path_is_missing .git/refs/heads/d1/d2 &&
+	test_path_is_missing .git/logs/refs/heads/d1/d2 &&
+	test_path_is_file .git/refs/heads/d1/r2 &&
+	test_path_is_file .git/logs/refs/heads/d1/r2
+'
+
+test_expect_success 'symref empty directory removal' '
+	git branch e1/e2/r1 HEAD &&
+	git branch e1/r2 HEAD &&
+	git checkout e1/e2/r1 &&
+	test_when_finished "git checkout master" &&
+	test_path_is_file .git/refs/heads/e1/e2/r1 &&
+	test_path_is_file .git/logs/refs/heads/e1/e2/r1 &&
+	git update-ref -d HEAD &&
+	test_path_is_missing .git/refs/heads/e1/e2 &&
+	test_path_is_missing .git/logs/refs/heads/e1/e2 &&
+	test_path_is_file .git/refs/heads/e1/r2 &&
+	test_path_is_file .git/logs/refs/heads/e1/r2 &&
+	test_path_is_file .git/logs/HEAD
+'
+
+cat >expect <<EOF
+$Z $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	Initial Creation
+$A $B $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150260 +0000	Switch
+$B $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150860 +0000
+EOF
+test_expect_success "verifying $m's log (logged by touch)" '
+	test_when_finished "rm -rf .git/$m .git/logs expect" &&
+	test_cmp expect .git/logs/$m
+'
+
+test_expect_success "create $m (logged by config)" '
+	test_config core.logAllRefUpdates true &&
+	GIT_COMMITTER_DATE="2005-05-26 23:32" \
+	git update-ref HEAD $A -m "Initial Creation" &&
+	test $A = $(cat .git/$m)
+'
+test_expect_success "update $m (logged by config)" '
+	test_config core.logAllRefUpdates true &&
+	GIT_COMMITTER_DATE="2005-05-26 23:33" \
+	git update-ref HEAD'" $B $A "'-m "Switch" &&
+	test $B = $(cat .git/$m)
+'
+test_expect_success "set $m (logged by config)" '
+	test_config core.logAllRefUpdates true &&
+	GIT_COMMITTER_DATE="2005-05-26 23:43" \
+	git update-ref HEAD $A &&
+	test $A = $(cat .git/$m)
+'
+
+cat >expect <<EOF
+$Z $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150320 +0000	Initial Creation
+$A $B $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150380 +0000	Switch
+$B $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150980 +0000
+EOF
+test_expect_success "verifying $m's log (logged by config)" '
+	test_when_finished "rm -f .git/$m .git/logs/$m expect" &&
+	test_cmp expect .git/logs/$m
+'
+
+git update-ref $m $D
+cat >.git/logs/$m <<EOF
+$Z $C $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150320 -0500
+$C $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150350 -0500
+$A $B $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150380 -0500
+$F $Z $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150680 -0500
+$Z $E $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150980 -0500
+EOF
+
+ed="Thu, 26 May 2005 18:32:00 -0500"
+gd="Thu, 26 May 2005 18:33:00 -0500"
+ld="Thu, 26 May 2005 18:43:00 -0500"
+test_expect_success 'Query "master@{May 25 2005}" (before history)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{May 25 2005}" >o 2>e &&
+	test $C = $(cat o) &&
+	test "warning: Log for '\''master'\'' only goes back to $ed." = "$(cat e)"
+'
+test_expect_success 'Query master@{2005-05-25} (before history)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify master@{2005-05-25} >o 2>e &&
+	test $C = $(cat o) &&
+	test "warning: Log for '\''master'\'' only goes back to $ed." = "$(cat e)"
+'
+test_expect_success 'Query "master@{May 26 2005 23:31:59}" (1 second before history)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{May 26 2005 23:31:59}" >o 2>e &&
+	test $C = $(cat o) &&
+	test "warning: Log for '\''master'\'' only goes back to $ed." = "$(cat e)"
+'
+test_expect_success 'Query "master@{May 26 2005 23:32:00}" (exactly history start)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{May 26 2005 23:32:00}" >o 2>e &&
+	test $C = $(cat o) &&
+	test "" = "$(cat e)"
+'
+test_expect_success 'Query "master@{May 26 2005 23:32:30}" (first non-creation change)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{May 26 2005 23:32:30}" >o 2>e &&
+	test $A = $(cat o) &&
+	test "" = "$(cat e)"
+'
+test_expect_success 'Query "master@{2005-05-26 23:33:01}" (middle of history with gap)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{2005-05-26 23:33:01}" >o 2>e &&
+	test $B = $(cat o) &&
+	test_i18ngrep -F "warning: log for ref $m has gap after $gd" e
+'
+test_expect_success 'Query "master@{2005-05-26 23:38:00}" (middle of history)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{2005-05-26 23:38:00}" >o 2>e &&
+	test $Z = $(cat o) &&
+	test "" = "$(cat e)"
+'
+test_expect_success 'Query "master@{2005-05-26 23:43:00}" (exact end of history)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{2005-05-26 23:43:00}" >o 2>e &&
+	test $E = $(cat o) &&
+	test "" = "$(cat e)"
+'
+test_expect_success 'Query "master@{2005-05-28}" (past end of history)' '
+	test_when_finished "rm -f o e" &&
+	git rev-parse --verify "master@{2005-05-28}" >o 2>e &&
+	test $D = $(cat o) &&
+	test_i18ngrep -F "warning: log for ref $m unexpectedly ended on $ld" e
+'
+
+rm -f .git/$m .git/logs/$m expect
+
+test_expect_success 'creating initial files' '
+	test_when_finished rm -f M &&
+	echo TEST >F &&
+	git add F &&
+	GIT_AUTHOR_DATE="2005-05-26 23:30" \
+	GIT_COMMITTER_DATE="2005-05-26 23:30" git commit -m add -a &&
+	h_TEST=$(git rev-parse --verify HEAD) &&
+	echo The other day this did not work. >M &&
+	echo And then Bob told me how to fix it. >>M &&
+	echo OTHER >F &&
+	GIT_AUTHOR_DATE="2005-05-26 23:41" \
+	GIT_COMMITTER_DATE="2005-05-26 23:41" git commit -F M -a &&
+	h_OTHER=$(git rev-parse --verify HEAD) &&
+	GIT_AUTHOR_DATE="2005-05-26 23:44" \
+	GIT_COMMITTER_DATE="2005-05-26 23:44" git commit --amend &&
+	h_FIXED=$(git rev-parse --verify HEAD) &&
+	echo Merged initial commit and a later commit. >M &&
+	echo $h_TEST >.git/MERGE_HEAD &&
+	GIT_AUTHOR_DATE="2005-05-26 23:45" \
+	GIT_COMMITTER_DATE="2005-05-26 23:45" git commit -F M &&
+	h_MERGED=$(git rev-parse --verify HEAD)
+'
+
+cat >expect <<EOF
+$Z $h_TEST $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	commit (initial): add
+$h_TEST $h_OTHER $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150860 +0000	commit: The other day this did not work.
+$h_OTHER $h_FIXED $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117151040 +0000	commit (amend): The other day this did not work.
+$h_FIXED $h_MERGED $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117151100 +0000	commit (merge): Merged initial commit and a later commit.
+EOF
+test_expect_success 'git commit logged updates' '
+	test_cmp expect .git/logs/$m
+'
+unset h_TEST h_OTHER h_FIXED h_MERGED
+
+test_expect_success 'git cat-file blob master:F (expect OTHER)' '
+	test OTHER = $(git cat-file blob master:F)
+'
+test_expect_success 'git cat-file blob master@{2005-05-26 23:30}:F (expect TEST)' '
+	test TEST = $(git cat-file blob "master@{2005-05-26 23:30}:F")
+'
+test_expect_success 'git cat-file blob master@{2005-05-26 23:42}:F (expect OTHER)' '
+	test OTHER = $(git cat-file blob "master@{2005-05-26 23:42}:F")
+'
+
+# Test adding and deleting pseudorefs
+
+test_expect_success 'given old value for missing pseudoref, do not create' '
+	test_must_fail git update-ref PSEUDOREF $A $B 2>err &&
+	test_path_is_missing .git/PSEUDOREF &&
+	test_i18ngrep "could not read ref" err
+'
+
+test_expect_success 'create pseudoref' '
+	git update-ref PSEUDOREF $A &&
+	test $A = $(cat .git/PSEUDOREF)
+'
+
+test_expect_success 'overwrite pseudoref with no old value given' '
+	git update-ref PSEUDOREF $B &&
+	test $B = $(cat .git/PSEUDOREF)
+'
+
+test_expect_success 'overwrite pseudoref with correct old value' '
+	git update-ref PSEUDOREF $C $B &&
+	test $C = $(cat .git/PSEUDOREF)
+'
+
+test_expect_success 'do not overwrite pseudoref with wrong old value' '
+	test_must_fail git update-ref PSEUDOREF $D $E 2>err &&
+	test $C = $(cat .git/PSEUDOREF) &&
+	test_i18ngrep "unexpected object ID" err
+'
+
+test_expect_success 'delete pseudoref' '
+	git update-ref -d PSEUDOREF &&
+	test_path_is_missing .git/PSEUDOREF
+'
+
+test_expect_success 'do not delete pseudoref with wrong old value' '
+	git update-ref PSEUDOREF $A &&
+	test_must_fail git update-ref -d PSEUDOREF $B 2>err &&
+	test $A = $(cat .git/PSEUDOREF) &&
+	test_i18ngrep "unexpected object ID" err
+'
+
+test_expect_success 'delete pseudoref with correct old value' '
+	git update-ref -d PSEUDOREF $A &&
+	test_path_is_missing .git/PSEUDOREF
+'
+
+test_expect_success 'create pseudoref with old OID zero' '
+	git update-ref PSEUDOREF $A $Z &&
+	test $A = $(cat .git/PSEUDOREF)
+'
+
+test_expect_success 'do not overwrite pseudoref with old OID zero' '
+	test_when_finished git update-ref -d PSEUDOREF &&
+	test_must_fail git update-ref PSEUDOREF $B $Z 2>err &&
+	test $A = $(cat .git/PSEUDOREF) &&
+	test_i18ngrep "already exists" err
+'
+
+# Test --stdin
+
+a=refs/heads/a
+b=refs/heads/b
+c=refs/heads/c
+E='""'
+F='%s\0'
+pws='path with space'
+
+test_expect_success 'stdin test setup' '
+	echo "$pws" >"$pws" &&
+	git add -- "$pws" &&
+	git commit -m "$pws"
+'
+
+test_expect_success '-z fails without --stdin' '
+	test_must_fail git update-ref -z $m $m $m 2>err &&
+	test_i18ngrep "usage: git update-ref" err
+'
+
+test_expect_success 'stdin works with no input' '
+	>stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse --verify -q $m
+'
+
+test_expect_success 'stdin fails on empty line' '
+	echo "" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: empty command in input" err
+'
+
+test_expect_success 'stdin fails on only whitespace' '
+	echo " " >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: whitespace before command:  " err
+'
+
+test_expect_success 'stdin fails on leading whitespace' '
+	echo " create $a $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: whitespace before command:  create $a $m" err
+'
+
+test_expect_success 'stdin fails on unknown command' '
+	echo "unknown $a" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: unknown command: unknown $a" err
+'
+
+test_expect_success 'stdin fails on unbalanced quotes' '
+	echo "create $a \"master" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: badly quoted argument: \\\"master" err
+'
+
+test_expect_success 'stdin fails on invalid escape' '
+	echo "create $a \"ma\zter\"" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: badly quoted argument: \\\"ma\\\\zter\\\"" err
+'
+
+test_expect_success 'stdin fails on junk after quoted argument' '
+	echo "create \"$a\"master" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: unexpected character after quoted argument: \\\"$a\\\"master" err
+'
+
+test_expect_success 'stdin fails create with no ref' '
+	echo "create " >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: create: missing <ref>" err
+'
+
+test_expect_success 'stdin fails create with no new value' '
+	echo "create $a" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: create $a: missing <newvalue>" err
+'
+
+test_expect_success 'stdin fails create with too many arguments' '
+	echo "create $a $m $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: create $a: extra input:  $m" err
+'
+
+test_expect_success 'stdin fails update with no ref' '
+	echo "update " >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: update: missing <ref>" err
+'
+
+test_expect_success 'stdin fails update with no new value' '
+	echo "update $a" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: update $a: missing <newvalue>" err
+'
+
+test_expect_success 'stdin fails update with too many arguments' '
+	echo "update $a $m $m $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: update $a: extra input:  $m" err
+'
+
+test_expect_success 'stdin fails delete with no ref' '
+	echo "delete " >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: delete: missing <ref>" err
+'
+
+test_expect_success 'stdin fails delete with too many arguments' '
+	echo "delete $a $m $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: delete $a: extra input:  $m" err
+'
+
+test_expect_success 'stdin fails verify with too many arguments' '
+	echo "verify $a $m $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: verify $a: extra input:  $m" err
+'
+
+test_expect_success 'stdin fails option with unknown name' '
+	echo "option unknown" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: option unknown: unknown" err
+'
+
+test_expect_success 'stdin fails with duplicate refs' '
+	cat >stdin <<-EOF &&
+	create $a $m
+	create $b $m
+	create $a $m
+	EOF
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	test_i18ngrep "fatal: multiple updates for ref '"'"'$a'"'"' not allowed" err
+'
+
+test_expect_success 'stdin create ref works' '
+	echo "create $a $m" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin does not create reflogs by default' '
+	test_when_finished "git update-ref -d $outside" &&
+	echo "create $outside $m" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	test_must_fail git reflog exists $outside
+'
+
+test_expect_success 'stdin creates reflogs with --create-reflog' '
+	test_when_finished "git update-ref -d $outside" &&
+	echo "create $outside $m" >stdin &&
+	git update-ref --create-reflog --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $outside >actual &&
+	test_cmp expect actual &&
+	git reflog exists $outside
+'
+
+test_expect_success 'stdin succeeds with quoted argument' '
+	git update-ref -d $a &&
+	echo "create $a \"$m\"" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin succeeds with escaped character' '
+	git update-ref -d $a &&
+	echo "create $a \"ma\\163ter\"" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin update ref creates with zero old value' '
+	echo "update $b $m $Z" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	git update-ref -d $b
+'
+
+test_expect_success 'stdin update ref creates with empty old value' '
+	echo "update $b $m $E" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin create ref works with path with space to blob' '
+	echo "create refs/blobs/pws \"$m:$pws\"" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse "$m:$pws" >expect &&
+	git rev-parse refs/blobs/pws >actual &&
+	test_cmp expect actual &&
+	git update-ref -d refs/blobs/pws
+'
+
+test_expect_success 'stdin update ref fails with wrong old value' '
+	echo "update $c $m $m~1" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$c'"'"'" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin update ref fails with bad old value' '
+	echo "update $c $m does-not-exist" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: update $c: invalid <oldvalue>: does-not-exist" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin create ref fails with bad new value' '
+	echo "create $c does-not-exist" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: create $c: invalid <newvalue>: does-not-exist" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin create ref fails with zero new value' '
+	echo "create $c " >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: create $c: zero <newvalue>" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin update ref works with right old value' '
+	echo "update $b $m~1 $m" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin delete ref fails with wrong old value' '
+	echo "delete $a $m~1" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$a'"'"'" err &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin delete ref fails with zero old value' '
+	echo "delete $a " >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: delete $a: zero <oldvalue>" err &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin update symref works option no-deref' '
+	git symbolic-ref TESTSYMREF $b &&
+	cat >stdin <<-EOF &&
+	option no-deref
+	update TESTSYMREF $a $b
+	EOF
+	git update-ref --stdin <stdin &&
+	git rev-parse TESTSYMREF >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin delete symref works option no-deref' '
+	git symbolic-ref TESTSYMREF $b &&
+	cat >stdin <<-EOF &&
+	option no-deref
+	delete TESTSYMREF $b
+	EOF
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q TESTSYMREF &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin update symref works flag --no-deref' '
+	git symbolic-ref TESTSYMREFONE $b &&
+	git symbolic-ref TESTSYMREFTWO $b &&
+	cat >stdin <<-EOF &&
+	update TESTSYMREFONE $a $b
+	update TESTSYMREFTWO $a $b
+	EOF
+	git update-ref --no-deref --stdin <stdin &&
+	git rev-parse TESTSYMREFONE TESTSYMREFTWO >expect &&
+	git rev-parse $a $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin delete symref works flag --no-deref' '
+	git symbolic-ref TESTSYMREFONE $b &&
+	git symbolic-ref TESTSYMREFTWO $b &&
+	cat >stdin <<-EOF &&
+	delete TESTSYMREFONE $b
+	delete TESTSYMREFTWO $b
+	EOF
+	git update-ref --no-deref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q TESTSYMREFONE &&
+	test_must_fail git rev-parse --verify -q TESTSYMREFTWO &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin delete ref works with right old value' '
+	echo "delete $b $m~1" >stdin &&
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q $b
+'
+
+test_expect_success 'stdin update/create/verify combination works' '
+	cat >stdin <<-EOF &&
+	update $a $m
+	create $b $m
+	verify $c
+	EOF
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin verify succeeds for correct value' '
+	git rev-parse $m >expect &&
+	echo "verify $m $m" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin verify succeeds for missing reference' '
+	echo "verify refs/heads/missing $Z" >stdin &&
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin verify treats no value as missing' '
+	echo "verify refs/heads/missing" >stdin &&
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin verify fails for wrong value' '
+	git rev-parse $m >expect &&
+	echo "verify $m $m~1" >stdin &&
+	test_must_fail git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin verify fails for mistaken null value' '
+	git rev-parse $m >expect &&
+	echo "verify $m $Z" >stdin &&
+	test_must_fail git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin verify fails for mistaken empty value' '
+	M=$(git rev-parse $m) &&
+	test_when_finished "git update-ref $m $M" &&
+	git rev-parse $m >expect &&
+	echo "verify $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin update refs works with identity updates' '
+	cat >stdin <<-EOF &&
+	update $a $m $m
+	update $b $m $m
+	update $c $Z $E
+	EOF
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin update refs fails with wrong old value' '
+	git update-ref $c $m &&
+	cat >stdin <<-EOF &&
+	update $a $m $m
+	update $b $m $m
+	update $c  ''
+	EOF
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$c'"'"'" err &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	git rev-parse $c >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin delete refs works with packed and loose refs' '
+	git pack-refs --all &&
+	git update-ref $c $m~1 &&
+	cat >stdin <<-EOF &&
+	delete $a $m
+	update $b $Z $m
+	update $c $E $m~1
+	EOF
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q $a &&
+	test_must_fail git rev-parse --verify -q $b &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z works on empty input' '
+	>stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse --verify -q $m
+'
+
+test_expect_success 'stdin -z fails on empty line' '
+	echo "" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: whitespace before command: " err
+'
+
+test_expect_success 'stdin -z fails on empty command' '
+	printf $F "" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: empty command in input" err
+'
+
+test_expect_success 'stdin -z fails on only whitespace' '
+	printf $F " " >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: whitespace before command:  " err
+'
+
+test_expect_success 'stdin -z fails on leading whitespace' '
+	printf $F " create $a" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: whitespace before command:  create $a" err
+'
+
+test_expect_success 'stdin -z fails on unknown command' '
+	printf $F "unknown $a" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: unknown command: unknown $a" err
+'
+
+test_expect_success 'stdin -z fails create with no ref' '
+	printf $F "create " >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: create: missing <ref>" err
+'
+
+test_expect_success 'stdin -z fails create with no new value' '
+	printf $F "create $a" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: create $a: unexpected end of input when reading <newvalue>" err
+'
+
+test_expect_success 'stdin -z fails create with too many arguments' '
+	printf $F "create $a" "$m" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: unknown command: $m" err
+'
+
+test_expect_success 'stdin -z fails update with no ref' '
+	printf $F "update " >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: update: missing <ref>" err
+'
+
+test_expect_success 'stdin -z fails update with too few args' '
+	printf $F "update $a" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: update $a: unexpected end of input when reading <oldvalue>" err
+'
+
+test_expect_success 'stdin -z emits warning with empty new value' '
+	git update-ref $a $m &&
+	printf $F "update $a" "" "" >stdin &&
+	git update-ref -z --stdin <stdin 2>err &&
+	grep "warning: update $a: missing <newvalue>, treating as zero" err &&
+	test_must_fail git rev-parse --verify -q $a
+'
+
+test_expect_success 'stdin -z fails update with no new value' '
+	printf $F "update $a" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: update $a: unexpected end of input when reading <newvalue>" err
+'
+
+test_expect_success 'stdin -z fails update with no old value' '
+	printf $F "update $a" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: update $a: unexpected end of input when reading <oldvalue>" err
+'
+
+test_expect_success 'stdin -z fails update with too many arguments' '
+	printf $F "update $a" "$m" "$m" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: unknown command: $m" err
+'
+
+test_expect_success 'stdin -z fails delete with no ref' '
+	printf $F "delete " >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: delete: missing <ref>" err
+'
+
+test_expect_success 'stdin -z fails delete with no old value' '
+	printf $F "delete $a" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: delete $a: unexpected end of input when reading <oldvalue>" err
+'
+
+test_expect_success 'stdin -z fails delete with too many arguments' '
+	printf $F "delete $a" "$m" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: unknown command: $m" err
+'
+
+test_expect_success 'stdin -z fails verify with too many arguments' '
+	printf $F "verify $a" "$m" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: unknown command: $m" err
+'
+
+test_expect_success 'stdin -z fails verify with no old value' '
+	printf $F "verify $a" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: verify $a: unexpected end of input when reading <oldvalue>" err
+'
+
+test_expect_success 'stdin -z fails option with unknown name' '
+	printf $F "option unknown" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: option unknown: unknown" err
+'
+
+test_expect_success 'stdin -z fails with duplicate refs' '
+	printf $F "create $a" "$m" "create $b" "$m" "create $a" "$m" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	test_i18ngrep "fatal: multiple updates for ref '"'"'$a'"'"' not allowed" err
+'
+
+test_expect_success 'stdin -z create ref works' '
+	printf $F "create $a" "$m" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z update ref creates with zero old value' '
+	printf $F "update $b" "$m" "$Z" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	git update-ref -d $b
+'
+
+test_expect_success 'stdin -z update ref creates with empty old value' '
+	printf $F "update $b" "$m" "" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z create ref works with path with space to blob' '
+	printf $F "create refs/blobs/pws" "$m:$pws" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse "$m:$pws" >expect &&
+	git rev-parse refs/blobs/pws >actual &&
+	test_cmp expect actual &&
+	git update-ref -d refs/blobs/pws
+'
+
+test_expect_success 'stdin -z update ref fails with wrong old value' '
+	printf $F "update $c" "$m" "$m~1" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$c'"'"'" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z update ref fails with bad old value' '
+	printf $F "update $c" "$m" "does-not-exist" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: update $c: invalid <oldvalue>: does-not-exist" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z create ref fails when ref exists' '
+	git update-ref $c $m &&
+	git rev-parse "$c" >expect &&
+	printf $F "create $c" "$m~1" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$c'"'"'" err &&
+	git rev-parse "$c" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z create ref fails with bad new value' '
+	git update-ref -d "$c" &&
+	printf $F "create $c" "does-not-exist" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: create $c: invalid <newvalue>: does-not-exist" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z create ref fails with empty new value' '
+	printf $F "create $c" "" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: create $c: missing <newvalue>" err &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z update ref works with right old value' '
+	printf $F "update $b" "$m~1" "$m" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z delete ref fails with wrong old value' '
+	printf $F "delete $a" "$m~1" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$a'"'"'" err &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z delete ref fails with zero old value' '
+	printf $F "delete $a" "$Z" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: delete $a: zero <oldvalue>" err &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z update symref works option no-deref' '
+	git symbolic-ref TESTSYMREF $b &&
+	printf $F "option no-deref" "update TESTSYMREF" "$a" "$b" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse TESTSYMREF >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z delete symref works option no-deref' '
+	git symbolic-ref TESTSYMREF $b &&
+	printf $F "option no-deref" "delete TESTSYMREF" "$b" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q TESTSYMREF &&
+	git rev-parse $m~1 >expect &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z delete ref works with right old value' '
+	printf $F "delete $b" "$m~1" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q $b
+'
+
+test_expect_success 'stdin -z update/create/verify combination works' '
+	printf $F "update $a" "$m" "" "create $b" "$m" "verify $c" "" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z verify succeeds for correct value' '
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "$m" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z verify succeeds for missing reference' '
+	printf $F "verify refs/heads/missing" "$Z" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin -z verify treats no value as missing' '
+	printf $F "verify refs/heads/missing" "" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin -z verify fails for wrong value' '
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "$m~1" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z verify fails for mistaken null value' '
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "$Z" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z verify fails for mistaken empty value' '
+	M=$(git rev-parse $m) &&
+	test_when_finished "git update-ref $m $M" &&
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z update refs works with identity updates' '
+	printf $F "update $a" "$m" "$m" "update $b" "$m" "$m" "update $c" "$Z" "" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'stdin -z update refs fails with wrong old value' '
+	git update-ref $c $m &&
+	printf $F "update $a" "$m" "$m" "update $b" "$m" "$m" "update $c" "$m" "$Z" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin 2>err &&
+	grep "fatal: cannot lock ref '"'"'$c'"'"'" err &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual &&
+	git rev-parse $b >actual &&
+	test_cmp expect actual &&
+	git rev-parse $c >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z delete refs works with packed and loose refs' '
+	git pack-refs --all &&
+	git update-ref $c $m~1 &&
+	printf $F "delete $a" "$m" "update $b" "$Z" "$m" "update $c" "" "$m~1" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q $a &&
+	test_must_fail git rev-parse --verify -q $b &&
+	test_must_fail git rev-parse --verify -q $c
+'
+
+test_expect_success 'fails with duplicate HEAD update' '
+	git branch target1 $A &&
+	git checkout target1 &&
+	cat >stdin <<-EOF &&
+	update refs/heads/target1 $C
+	option no-deref
+	update HEAD $B
+	EOF
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	test_i18ngrep "fatal: multiple updates for '\''HEAD'\'' (including one via its referent .refs/heads/target1.) are not allowed" err &&
+	echo "refs/heads/target1" >expect &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
+	echo "$A" >expect &&
+	git rev-parse refs/heads/target1 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'fails with duplicate ref update via symref' '
+	git branch target2 $A &&
+	git symbolic-ref refs/heads/symref2 refs/heads/target2 &&
+	cat >stdin <<-EOF &&
+	update refs/heads/target2 $C
+	update refs/heads/symref2 $B
+	EOF
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	test_i18ngrep "fatal: multiple updates for '\''refs/heads/target2'\'' (including one via symref .refs/heads/symref2.) are not allowed" err &&
+	echo "refs/heads/target2" >expect &&
+	git symbolic-ref refs/heads/symref2 >actual &&
+	test_cmp expect actual &&
+	echo "$A" >expect &&
+	git rev-parse refs/heads/target2 >actual &&
+	test_cmp expect actual
+'
+
+run_with_limited_open_files () {
+	(ulimit -n 32 && "$@")
+}
+
+test_lazy_prereq ULIMIT_FILE_DESCRIPTORS '
+	test_have_prereq !MINGW,!CYGWIN &&
+	run_with_limited_open_files true
+'
+
+test_expect_success ULIMIT_FILE_DESCRIPTORS 'large transaction creating branches does not burst open file limit' '
+(
+	for i in $(test_seq 33)
+	do
+		echo "create refs/heads/$i HEAD"
+	done >large_input &&
+	run_with_limited_open_files git update-ref --stdin <large_input &&
+	git rev-parse --verify -q refs/heads/33
+)
+'
+
+test_expect_success ULIMIT_FILE_DESCRIPTORS 'large transaction deleting branches does not burst open file limit' '
+(
+	for i in $(test_seq 33)
+	do
+		echo "delete refs/heads/$i HEAD"
+	done >large_input &&
+	run_with_limited_open_files git update-ref --stdin <large_input &&
+	test_must_fail git rev-parse --verify -q refs/heads/33
+)
+'
+
+test_expect_success 'handle per-worktree refs in refs/bisect' '
+	git commit --allow-empty -m "initial commit" &&
+	git worktree add -b branch worktree &&
+	(
+		cd worktree &&
+		git commit --allow-empty -m "test commit"  &&
+		git for-each-ref >for-each-ref.out &&
+		! grep refs/bisect for-each-ref.out &&
+		git update-ref refs/bisect/something HEAD &&
+		git rev-parse refs/bisect/something >../worktree-head &&
+		git for-each-ref | grep refs/bisect/something
+	) &&
+	test_path_is_missing .git/refs/bisect &&
+	test_must_fail git rev-parse refs/bisect/something &&
+	git update-ref refs/bisect/something HEAD &&
+	git rev-parse refs/bisect/something >main-head &&
+	! test_cmp main-head worktree-head
+'
+
+test_done