Merge branch 'mh/ref-locking-fix'

Transactions to update multiple references that involves a deletion
was quite broken in an error codepath and did not abort everything
correctly.

* mh/ref-locking-fix:
files_transaction_prepare(): fix handling of ref lock failure
t1404: add a bunch of tests of D/F conflicts

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 014dabb0bf3647b9392d6087ebf6c40e1bc68108..8cc1e07fdb7204d13c99826304317c66d4249cf5 100644 (file)
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2570,7 +2570,7 @@ static int files_transaction_prepare(struct ref_store *ref_store,
                ret = lock_ref_for_update(refs, update, transaction,
                                          head_ref, &affected_refnames, err);
                if (ret)
-                       break;
+                       goto cleanup;
 
                if (update->flags & REF_DELETING &&
                    !(update->flags & REF_LOG_ONLY) &&

diff --git a/t/t1404-update-ref-errors.sh b/t/t1404-update-ref-errors.sh
index 100d50e3623c2eb4b3498dd87f95402617c6d737..3a887b511340b50a0cadcf1968a8c0986d67d66c 100755 (executable)
--- a/t/t1404-update-ref-errors.sh
+++ b/t/t1404-update-ref-errors.sh
@@ -34,6 +34,81 @@ test_update_rejected () {
 
 Q="'"
 
+# Test adding and deleting D/F-conflicting references in a single
+# transaction.
+df_test() {
+       prefix="$1"
+       pack=: symadd=false symdel=false add_del=false addref= delref=
+       shift
+       while test $# -gt 0
+       do
+               case "$1" in
+               --pack)
+                       pack="git pack-refs --all"
+                       shift
+                       ;;
+               --sym-add)
+                       # Perform the add via a symbolic reference
+                       symadd=true
+                       shift
+                       ;;
+               --sym-del)
+                       # Perform the del via a symbolic reference
+                       symdel=true
+                       shift
+                       ;;
+               --del-add)
+                       # Delete first reference then add second
+                       add_del=false
+                       delref="$prefix/r/$2"
+                       addref="$prefix/r/$3"
+                       shift 3
+                       ;;
+               --add-del)
+                       # Add first reference then delete second
+                       add_del=true
+                       addref="$prefix/r/$2"
+                       delref="$prefix/r/$3"
+                       shift 3
+                       ;;
+               *)
+                       echo 1>&2 "Extra args to df_test: $*"
+                       return 1
+                       ;;
+               esac
+       done
+       git update-ref "$delref" $C &&
+       if $symadd
+       then
+               addname="$prefix/s/symadd" &&
+               git symbolic-ref "$addname" "$addref"
+       else
+               addname="$addref"
+       fi &&
+       if $symdel
+       then
+               delname="$prefix/s/symdel" &&
+               git symbolic-ref "$delname" "$delref"
+       else
+               delname="$delref"
+       fi &&
+       cat >expected-err <<-EOF &&
+       fatal: cannot lock ref $Q$addname$Q: $Q$delref$Q exists; cannot create $Q$addref$Q
+       EOF
+       $pack &&
+       if $add_del
+       then
+               printf "%s\n" "create $addname $D" "delete $delname"
+       else
+               printf "%s\n" "delete $delname" "create $addname $D"
+       fi >commands &&
+       test_must_fail git update-ref --stdin <commands 2>output.err &&
+       test_cmp expected-err output.err &&
+       printf "%s\n" "$C $delref" >expected-refs &&
+       git for-each-ref --format="%(objectname) %(refname)" $prefix/r >actual-refs &&
+       test_cmp expected-refs actual-refs
+}
+
 test_expect_success 'setup' '
 
        git commit --allow-empty -m Initial &&
@@ -188,6 +263,72 @@ test_expect_success 'empty directory should not fool 1-arg delete' '
        git update-ref --stdin
 '
 
+test_expect_success 'D/F conflict prevents add long + delete short' '
+       df_test refs/df-al-ds --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents add short + delete long' '
+       df_test refs/df-as-dl --add-del foo foo/bar
+'
+
+test_expect_success 'D/F conflict prevents delete long + add short' '
+       df_test refs/df-dl-as --del-add foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents delete short + add long' '
+       df_test refs/df-ds-al --del-add foo foo/bar
+'
+
+test_expect_success 'D/F conflict prevents add long + delete short packed' '
+       df_test refs/df-al-dsp --pack --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents add short + delete long packed' '
+       df_test refs/df-as-dlp --pack --add-del foo foo/bar
+'
+
+test_expect_success 'D/F conflict prevents delete long packed + add short' '
+       df_test refs/df-dlp-as --pack --del-add foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents delete short packed + add long' '
+       df_test refs/df-dsp-al --pack --del-add foo foo/bar
+'
+
+# Try some combinations involving symbolic refs...
+
+test_expect_success 'D/F conflict prevents indirect add long + delete short' '
+       df_test refs/df-ial-ds --sym-add --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents indirect add long + indirect delete short' '
+       df_test refs/df-ial-ids --sym-add --sym-del --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents indirect add short + indirect delete long' '
+       df_test refs/df-ias-idl --sym-add --sym-del --add-del foo foo/bar
+'
+
+test_expect_success 'D/F conflict prevents indirect delete long + indirect add short' '
+       df_test refs/df-idl-ias --sym-add --sym-del --del-add foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents indirect add long + delete short packed' '
+       df_test refs/df-ial-dsp --sym-add --pack --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents indirect add long + indirect delete short packed' '
+       df_test refs/df-ial-idsp --sym-add --sym-del --pack --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents add long + indirect delete short packed' '
+       df_test refs/df-al-idsp --sym-del --pack --add-del foo/bar foo
+'
+
+test_expect_success 'D/F conflict prevents indirect delete long packed + indirect add short' '
+       df_test refs/df-idlp-ias --sym-add --sym-del --pack --del-add foo/bar foo
+'
+
 # Test various errors when reading the old values of references...
 
 test_expect_success 'missing old value blocks update' '