Merge branch 'mh/update-ref-errors'
Error handling in the codepaths that updates refs has been
improved.
* mh/update-ref-errors:
lock_ref_for_update(): avoid a symref resolution
lock_ref_for_update(): make error handling more uniform
t1404: add more tests of update-ref error handling
t1404: document function test_update_rejected
t1404: remove "prefix" argument to test_update_rejected
t1404: rename file to t1404-update-ref-errors.sh
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 4dd72b4..1bf6430 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3389,6 +3389,38 @@ static const char *original_update_refname(struct ref_update *update)
}
/*
+ * Check whether the REF_HAVE_OLD and old_oid values stored in update
+ * are consistent with oid, which is the reference's current value. If
+ * everything is OK, return 0; otherwise, write an error message to
+ * err and return -1.
+ */
+static int check_old_oid(struct ref_update *update, struct object_id *oid,
+ struct strbuf *err)
+{
+ if (!(update->flags & REF_HAVE_OLD) ||
+ !hashcmp(oid->hash, update->old_sha1))
+ return 0;
+
+ if (is_null_sha1(update->old_sha1))
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "reference already exists",
+ original_update_refname(update));
+ else if (is_null_oid(oid))
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "reference is missing but expected %s",
+ original_update_refname(update),
+ sha1_to_hex(update->old_sha1));
+ else
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "is at %s but expected %s",
+ original_update_refname(update),
+ oid_to_hex(oid),
+ sha1_to_hex(update->old_sha1));
+
+ return -1;
+}
+
+/*
* Prepare for carrying out update:
* - Lock the reference referred to by update.
* - Read the reference under lock.
@@ -3433,7 +3465,7 @@ static int lock_ref_for_update(struct ref_update *update,
reason = strbuf_detach(err, NULL);
strbuf_addf(err, "cannot lock ref '%s': %s",
- update->refname, reason);
+ original_update_refname(update), reason);
free(reason);
return ret;
}
@@ -3447,28 +3479,17 @@ static int lock_ref_for_update(struct ref_update *update,
* the transaction, so we have to read it here
* to record and possibly check old_sha1:
*/
- if (read_ref_full(update->refname,
- mustexist ? RESOLVE_REF_READING : 0,
+ if (read_ref_full(referent.buf, 0,
lock->old_oid.hash, NULL)) {
if (update->flags & REF_HAVE_OLD) {
strbuf_addf(err, "cannot lock ref '%s': "
- "can't resolve old value",
- update->refname);
- return TRANSACTION_GENERIC_ERROR;
- } else {
- hashclr(lock->old_oid.hash);
+ "error reading reference",
+ original_update_refname(update));
+ return -1;
}
- }
- if ((update->flags & REF_HAVE_OLD) &&
- hashcmp(lock->old_oid.hash, update->old_sha1)) {
- strbuf_addf(err, "cannot lock ref '%s': "
- "is at %s but expected %s",
- update->refname,
- sha1_to_hex(lock->old_oid.hash),
- sha1_to_hex(update->old_sha1));
+ } else if (check_old_oid(update, &lock->old_oid, err)) {
return TRANSACTION_GENERIC_ERROR;
}
-
} else {
/*
* Create a new update for the reference this
@@ -3485,6 +3506,9 @@ static int lock_ref_for_update(struct ref_update *update,
} else {
struct ref_update *parent_update;
+ if (check_old_oid(update, &lock->old_oid, err))
+ return TRANSACTION_GENERIC_ERROR;
+
/*
* If this update is happening indirectly because of a
* symref update, record the old SHA-1 in the parent
@@ -3495,20 +3519,6 @@ static int lock_ref_for_update(struct ref_update *update,
parent_update = parent_update->parent_update) {
oidcpy(&parent_update->lock->old_oid, &lock->old_oid);
}
-
- if ((update->flags & REF_HAVE_OLD) &&
- hashcmp(lock->old_oid.hash, update->old_sha1)) {
- if (is_null_sha1(update->old_sha1))
- strbuf_addf(err, "cannot lock ref '%s': reference already exists",
- original_update_refname(update));
- else
- strbuf_addf(err, "cannot lock ref '%s': is at %s but expected %s",
- original_update_refname(update),
- sha1_to_hex(lock->old_oid.hash),
- sha1_to_hex(update->old_sha1));
-
- return TRANSACTION_GENERIC_ERROR;
- }
}
if ((update->flags & REF_HAVE_NEW) &&
@@ -3530,7 +3540,7 @@ static int lock_ref_for_update(struct ref_update *update,
*/
update->lock = NULL;
strbuf_addf(err,
- "cannot update the ref '%s': %s",
+ "cannot update ref '%s': %s",
update->refname, write_err);
free(write_err);
return TRANSACTION_GENERIC_ERROR;
diff --git a/t/t1404-update-ref-df-conflicts.sh b/t/t1404-update-ref-df-conflicts.sh
deleted file mode 100755
index 6d869d1..0000000
--- a/t/t1404-update-ref-df-conflicts.sh
+++ /dev/null
@@ -1,181 +0,0 @@
-#!/bin/sh
-
-test_description='Test git update-ref with D/F conflicts'
-. ./test-lib.sh
-
-test_update_rejected () {
- prefix="$1" &&
- before="$2" &&
- pack="$3" &&
- create="$4" &&
- error="$5" &&
- printf "create $prefix/%s $C\n" $before |
- git update-ref --stdin &&
- git for-each-ref $prefix >unchanged &&
- if $pack
- then
- git pack-refs --all
- fi &&
- printf "create $prefix/%s $C\n" $create >input &&
- test_must_fail git update-ref --stdin <input 2>output.err &&
- grep -F "$error" output.err &&
- git for-each-ref $prefix >actual &&
- test_cmp unchanged actual
-}
-
-Q="'"
-
-test_expect_success 'setup' '
-
- git commit --allow-empty -m Initial &&
- C=$(git rev-parse HEAD) &&
- git commit --allow-empty -m Second &&
- D=$(git rev-parse HEAD)
-
-'
-
-test_expect_success 'existing loose ref is a simple prefix of new' '
-
- prefix=refs/1l &&
- test_update_rejected $prefix "a c e" false "b c/x d" \
- "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x$Q"
-
-'
-
-test_expect_success 'existing packed ref is a simple prefix of new' '
-
- prefix=refs/1p &&
- test_update_rejected $prefix "a c e" true "b c/x d" \
- "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x$Q"
-
-'
-
-test_expect_success 'existing loose ref is a deeper prefix of new' '
-
- prefix=refs/2l &&
- test_update_rejected $prefix "a c e" false "b c/x/y d" \
- "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x/y$Q"
-
-'
-
-test_expect_success 'existing packed ref is a deeper prefix of new' '
-
- prefix=refs/2p &&
- test_update_rejected $prefix "a c e" true "b c/x/y d" \
- "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x/y$Q"
-
-'
-
-test_expect_success 'new ref is a simple prefix of existing loose' '
-
- prefix=refs/3l &&
- test_update_rejected $prefix "a c/x e" false "b c d" \
- "$Q$prefix/c/x$Q exists; cannot create $Q$prefix/c$Q"
-
-'
-
-test_expect_success 'new ref is a simple prefix of existing packed' '
-
- prefix=refs/3p &&
- test_update_rejected $prefix "a c/x e" true "b c d" \
- "$Q$prefix/c/x$Q exists; cannot create $Q$prefix/c$Q"
-
-'
-
-test_expect_success 'new ref is a deeper prefix of existing loose' '
-
- prefix=refs/4l &&
- test_update_rejected $prefix "a c/x/y e" false "b c d" \
- "$Q$prefix/c/x/y$Q exists; cannot create $Q$prefix/c$Q"
-
-'
-
-test_expect_success 'new ref is a deeper prefix of existing packed' '
-
- prefix=refs/4p &&
- test_update_rejected $prefix "a c/x/y e" true "b c d" \
- "$Q$prefix/c/x/y$Q exists; cannot create $Q$prefix/c$Q"
-
-'
-
-test_expect_success 'one new ref is a simple prefix of another' '
-
- prefix=refs/5 &&
- test_update_rejected $prefix "a e" false "b c c/x d" \
- "cannot process $Q$prefix/c$Q and $Q$prefix/c/x$Q at the same time"
-
-'
-
-test_expect_success 'empty directory should not fool rev-parse' '
- prefix=refs/e-rev-parse &&
- git update-ref $prefix/foo $C &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- echo "$C" >expected &&
- git rev-parse $prefix/foo >actual &&
- test_cmp expected actual
-'
-
-test_expect_success 'empty directory should not fool for-each-ref' '
- prefix=refs/e-for-each-ref &&
- git update-ref $prefix/foo $C &&
- git for-each-ref $prefix >expected &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- git for-each-ref $prefix >actual &&
- test_cmp expected actual
-'
-
-test_expect_success 'empty directory should not fool create' '
- prefix=refs/e-create &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- printf "create %s $C\n" $prefix/foo |
- git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool verify' '
- prefix=refs/e-verify &&
- git update-ref $prefix/foo $C &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- printf "verify %s $C\n" $prefix/foo |
- git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 1-arg update' '
- prefix=refs/e-update-1 &&
- git update-ref $prefix/foo $C &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- printf "update %s $D\n" $prefix/foo |
- git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 2-arg update' '
- prefix=refs/e-update-2 &&
- git update-ref $prefix/foo $C &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- printf "update %s $D $C\n" $prefix/foo |
- git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 0-arg delete' '
- prefix=refs/e-delete-0 &&
- git update-ref $prefix/foo $C &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- printf "delete %s\n" $prefix/foo |
- git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 1-arg delete' '
- prefix=refs/e-delete-1 &&
- git update-ref $prefix/foo $C &&
- git pack-refs --all &&
- mkdir -p .git/$prefix/foo/bar/baz &&
- printf "delete %s $C\n" $prefix/foo |
- git update-ref --stdin
-'
-
-test_done
diff --git a/t/t1404-update-ref-errors.sh b/t/t1404-update-ref-errors.sh
new file mode 100755
index 0000000..c34ece4
--- /dev/null
+++ b/t/t1404-update-ref-errors.sh
@@ -0,0 +1,407 @@
+#!/bin/sh
+
+test_description='Test git update-ref error handling'
+. ./test-lib.sh
+
+# Create some references, perhaps run pack-refs --all, then try to
+# create some more references. Ensure that the second creation fails
+# with the correct error message.
+# Usage: test_update_rejected <before> <pack> <create> <error>
+# <before> is a ws-separated list of refs to create before the test
+# <pack> (true or false) tells whether to pack the refs before the test
+# <create> is a list of variables to attempt creating
+# <error> is a string to look for in the stderr of update-ref.
+# All references are created in the namespace specified by the current
+# value of $prefix.
+test_update_rejected () {
+ before="$1" &&
+ pack="$2" &&
+ create="$3" &&
+ error="$4" &&
+ printf "create $prefix/%s $C\n" $before |
+ git update-ref --stdin &&
+ git for-each-ref $prefix >unchanged &&
+ if $pack
+ then
+ git pack-refs --all
+ fi &&
+ printf "create $prefix/%s $C\n" $create >input &&
+ test_must_fail git update-ref --stdin <input 2>output.err &&
+ grep -F "$error" output.err &&
+ git for-each-ref $prefix >actual &&
+ test_cmp unchanged actual
+}
+
+Q="'"
+
+test_expect_success 'setup' '
+
+ git commit --allow-empty -m Initial &&
+ C=$(git rev-parse HEAD) &&
+ git commit --allow-empty -m Second &&
+ D=$(git rev-parse HEAD) &&
+ git commit --allow-empty -m Third &&
+ E=$(git rev-parse HEAD)
+'
+
+test_expect_success 'existing loose ref is a simple prefix of new' '
+
+ prefix=refs/1l &&
+ test_update_rejected "a c e" false "b c/x d" \
+ "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x$Q"
+
+'
+
+test_expect_success 'existing packed ref is a simple prefix of new' '
+
+ prefix=refs/1p &&
+ test_update_rejected "a c e" true "b c/x d" \
+ "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x$Q"
+
+'
+
+test_expect_success 'existing loose ref is a deeper prefix of new' '
+
+ prefix=refs/2l &&
+ test_update_rejected "a c e" false "b c/x/y d" \
+ "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x/y$Q"
+
+'
+
+test_expect_success 'existing packed ref is a deeper prefix of new' '
+
+ prefix=refs/2p &&
+ test_update_rejected "a c e" true "b c/x/y d" \
+ "$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x/y$Q"
+
+'
+
+test_expect_success 'new ref is a simple prefix of existing loose' '
+
+ prefix=refs/3l &&
+ test_update_rejected "a c/x e" false "b c d" \
+ "$Q$prefix/c/x$Q exists; cannot create $Q$prefix/c$Q"
+
+'
+
+test_expect_success 'new ref is a simple prefix of existing packed' '
+
+ prefix=refs/3p &&
+ test_update_rejected "a c/x e" true "b c d" \
+ "$Q$prefix/c/x$Q exists; cannot create $Q$prefix/c$Q"
+
+'
+
+test_expect_success 'new ref is a deeper prefix of existing loose' '
+
+ prefix=refs/4l &&
+ test_update_rejected "a c/x/y e" false "b c d" \
+ "$Q$prefix/c/x/y$Q exists; cannot create $Q$prefix/c$Q"
+
+'
+
+test_expect_success 'new ref is a deeper prefix of existing packed' '
+
+ prefix=refs/4p &&
+ test_update_rejected "a c/x/y e" true "b c d" \
+ "$Q$prefix/c/x/y$Q exists; cannot create $Q$prefix/c$Q"
+
+'
+
+test_expect_success 'one new ref is a simple prefix of another' '
+
+ prefix=refs/5 &&
+ test_update_rejected "a e" false "b c c/x d" \
+ "cannot process $Q$prefix/c$Q and $Q$prefix/c/x$Q at the same time"
+
+'
+
+test_expect_success 'empty directory should not fool rev-parse' '
+ prefix=refs/e-rev-parse &&
+ git update-ref $prefix/foo $C &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ echo "$C" >expected &&
+ git rev-parse $prefix/foo >actual &&
+ test_cmp expected actual
+'
+
+test_expect_success 'empty directory should not fool for-each-ref' '
+ prefix=refs/e-for-each-ref &&
+ git update-ref $prefix/foo $C &&
+ git for-each-ref $prefix >expected &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ git for-each-ref $prefix >actual &&
+ test_cmp expected actual
+'
+
+test_expect_success 'empty directory should not fool create' '
+ prefix=refs/e-create &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ printf "create %s $C\n" $prefix/foo |
+ git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool verify' '
+ prefix=refs/e-verify &&
+ git update-ref $prefix/foo $C &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ printf "verify %s $C\n" $prefix/foo |
+ git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 1-arg update' '
+ prefix=refs/e-update-1 &&
+ git update-ref $prefix/foo $C &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ printf "update %s $D\n" $prefix/foo |
+ git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 2-arg update' '
+ prefix=refs/e-update-2 &&
+ git update-ref $prefix/foo $C &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ printf "update %s $D $C\n" $prefix/foo |
+ git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 0-arg delete' '
+ prefix=refs/e-delete-0 &&
+ git update-ref $prefix/foo $C &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ printf "delete %s\n" $prefix/foo |
+ git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 1-arg delete' '
+ prefix=refs/e-delete-1 &&
+ git update-ref $prefix/foo $C &&
+ git pack-refs --all &&
+ mkdir -p .git/$prefix/foo/bar/baz &&
+ printf "delete %s $C\n" $prefix/foo |
+ git update-ref --stdin
+'
+
+# Test various errors when reading the old values of references...
+
+test_expect_success 'missing old value blocks update' '
+ prefix=refs/missing-update &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q
+ EOF
+ printf "%s\n" "update $prefix/foo $E $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'incorrect old value blocks update' '
+ prefix=refs/incorrect-update &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: is at $C but expected $D
+ EOF
+ printf "%s\n" "update $prefix/foo $E $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'existing old value blocks create' '
+ prefix=refs/existing-create &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: reference already exists
+ EOF
+ printf "%s\n" "create $prefix/foo $E" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'incorrect old value blocks delete' '
+ prefix=refs/incorrect-delete &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: is at $C but expected $D
+ EOF
+ printf "%s\n" "delete $prefix/foo $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'missing old value blocks indirect update' '
+ prefix=refs/missing-indirect-update &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q
+ EOF
+ printf "%s\n" "update $prefix/symref $E $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'incorrect old value blocks indirect update' '
+ prefix=refs/incorrect-indirect-update &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+ EOF
+ printf "%s\n" "update $prefix/symref $E $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'existing old value blocks indirect create' '
+ prefix=refs/existing-indirect-create &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: reference already exists
+ EOF
+ printf "%s\n" "create $prefix/symref $E" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'incorrect old value blocks indirect delete' '
+ prefix=refs/incorrect-indirect-delete &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+ EOF
+ printf "%s\n" "delete $prefix/symref $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'missing old value blocks indirect no-deref update' '
+ prefix=refs/missing-noderef-update &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: reference is missing but expected $D
+ EOF
+ printf "%s\n" "option no-deref" "update $prefix/symref $E $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'incorrect old value blocks indirect no-deref update' '
+ prefix=refs/incorrect-noderef-update &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+ EOF
+ printf "%s\n" "option no-deref" "update $prefix/symref $E $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'existing old value blocks indirect no-deref create' '
+ prefix=refs/existing-noderef-create &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: reference already exists
+ EOF
+ printf "%s\n" "option no-deref" "create $prefix/symref $E" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'incorrect old value blocks indirect no-deref delete' '
+ prefix=refs/incorrect-noderef-delete &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ git update-ref $prefix/foo $C &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+ EOF
+ printf "%s\n" "option no-deref" "delete $prefix/symref $D" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'non-empty directory blocks create' '
+ prefix=refs/ne-create &&
+ mkdir -p .git/$prefix/foo/bar &&
+ : >.git/$prefix/foo/bar/baz.lock &&
+ test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: there is a non-empty directory $Q.git/$prefix/foo$Q blocking reference $Q$prefix/foo$Q
+ EOF
+ printf "%s\n" "update $prefix/foo $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q
+ EOF
+ printf "%s\n" "update $prefix/foo $D $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'broken reference blocks create' '
+ prefix=refs/broken-create &&
+ mkdir -p .git/$prefix &&
+ echo "gobbledigook" >.git/$prefix/foo &&
+ test_when_finished "rm -f .git/$prefix/foo" &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+ EOF
+ printf "%s\n" "update $prefix/foo $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+ EOF
+ printf "%s\n" "update $prefix/foo $D $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'non-empty directory blocks indirect create' '
+ prefix=refs/ne-indirect-create &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ mkdir -p .git/$prefix/foo/bar &&
+ : >.git/$prefix/foo/bar/baz.lock &&
+ test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: there is a non-empty directory $Q.git/$prefix/foo$Q blocking reference $Q$prefix/foo$Q
+ EOF
+ printf "%s\n" "update $prefix/symref $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q
+ EOF
+ printf "%s\n" "update $prefix/symref $D $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_expect_success 'broken reference blocks indirect create' '
+ prefix=refs/broken-indirect-create &&
+ git symbolic-ref $prefix/symref $prefix/foo &&
+ echo "gobbledigook" >.git/$prefix/foo &&
+ test_when_finished "rm -f .git/$prefix/foo" &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+ EOF
+ printf "%s\n" "update $prefix/symref $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err &&
+ cat >expected <<-EOF &&
+ fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+ EOF
+ printf "%s\n" "update $prefix/symref $D $C" |
+ test_must_fail git update-ref --stdin 2>output.err &&
+ test_cmp expected output.err
+'
+
+test_done
