Merge branch 'ps/completion-with-reftable-fix'

Completion update to prepare for reftable

* ps/completion-with-reftable-fix:
  completion: treat dangling symrefs as existing pseudorefs
  completion: silence pseudoref existence check
  completion: improve existence check for pseudo-refs
  t9902: verify that completion does not print anything
  completion: discover repo path in `__git_pseudoref_exists ()`

contrib/completion/git-completion.bash

@@ -137,6 +137,9 @@ __git_eread ()
 __git_pseudoref_exists ()
 {
 	local ref=$1
+	local head
+
+	__git_find_repo_path
 
 	# If the reftable is in use, we have to shell out to 'git rev-parse'
 	# to determine whether the ref exists instead of looking directly in
@@ -144,9 +147,8 @@ __git_pseudoref_exists ()
 	# Bash builtins since executing Git commands are expensive on some
 	# platforms.
 	if __git_eread "$__git_repo_path/HEAD" head; then
-		b="${head#ref: }"
-		if [ "$b" == "refs/heads/.invalid" ]; then
-			__git -C "$__git_repo_path" rev-parse --verify --quiet "$ref" 2>/dev/null
+		if [ "$head" == "ref: refs/heads/.invalid" ]; then
+			__git show-ref --exists "$ref"
 			return $?
 		fi
 	fi
@@ -1656,7 +1658,6 @@ __git_cherry_pick_inprogress_options=$__git_sequencer_inprogress_options
 
 _git_cherry_pick ()
 {
-	__git_find_repo_path
 	if __git_pseudoref_exists CHERRY_PICK_HEAD; then
 		__gitcomp "$__git_cherry_pick_inprogress_options"
 		return
@@ -2966,7 +2967,6 @@ _git_reset ()
 
 _git_restore ()
 {
-	__git_find_repo_path
 	case "$prev" in
 	-s)
 		__git_complete_refs
@@ -2995,7 +2995,6 @@ __git_revert_inprogress_options=$__git_sequencer_inprogress_options
 
 _git_revert ()
 {
-	__git_find_repo_path
 	if __git_pseudoref_exists REVERT_HEAD; then
 		__gitcomp "$__git_revert_inprogress_options"
 		return

t/t9902-completion.sh

@@ -5,6 +5,12 @@
 
 test_description='test bash completion'
 
+# The Bash completion scripts must not print anything to either stdout or
+# stderr, which we try to verify. When tracing is enabled without support for
+# BASH_XTRACEFD this assertion will fail, so we have to mark the test as
+# untraceable with such ancient Bash versions.
+test_untraceable=UnfortunatelyYes
+
 . ./lib-bash.sh
 
 complete ()
@@ -87,9 +93,11 @@ test_completion ()
 	else
 		sed -e 's/Z$//' |sort >expected
 	fi &&
-	run_completion "$1" &&
+	run_completion "$1" >"$TRASH_DIRECTORY"/bash-completion-output 2>&1 &&
 	sort out >out_sorted &&
-	test_cmp expected out_sorted
+	test_cmp expected out_sorted &&
+	test_must_be_empty "$TRASH_DIRECTORY"/bash-completion-output &&
+	rm "$TRASH_DIRECTORY"/bash-completion-output
 }
 
 # Test __gitcomp.
@@ -1925,6 +1933,14 @@ test_expect_success 'git checkout - --orphan with branch already provided comple
 	EOF
 '
 
+test_expect_success 'git restore completes modified files' '
+	test_commit A a.file &&
+	echo B >a.file &&
+	test_completion "git restore a." <<-\EOF
+	a.file
+	EOF
+'
+
 test_expect_success 'teardown after ref completion' '
 	git branch -d matching-branch &&
 	git tag -d matching-tag &&
@@ -2720,4 +2736,31 @@ test_expect_success '__git_complete' '
 	test_must_fail __git_complete ga missing
 '
 
+test_expect_success '__git_pseudoref_exists' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		sane_unset __git_repo_path &&
+
+		# HEAD should exist, even if it points to an unborn branch.
+		__git_pseudoref_exists HEAD >output 2>&1 &&
+		test_must_be_empty output &&
+
+		# HEAD points to an existing branch, so it should exist.
+		test_commit A &&
+		__git_pseudoref_exists HEAD >output 2>&1 &&
+		test_must_be_empty output &&
+
+		# CHERRY_PICK_HEAD does not exist, so the existence check should fail.
+		! __git_pseudoref_exists CHERRY_PICK_HEAD >output 2>&1 &&
+		test_must_be_empty output &&
+
+		# CHERRY_PICK_HEAD points to a commit, so it should exist.
+		git update-ref CHERRY_PICK_HEAD A &&
+		__git_pseudoref_exists CHERRY_PICK_HEAD >output 2>&1 &&
+		test_must_be_empty output
+	)
+'
+
 test_done