Subject: [PATCH v2 6/8] commit-graph verify: detect inability to read the graph

From: Ævar Arnfjörð Bjarmason <[email-masked]>
Date: Thu, 14 Mar 2019 22:47:38 +0100

Change "commit-graph verify" to error on open() failures other than
ENOENT. As noted in the third paragraph of 283e68c72f ("commit-graph:
add 'verify' subcommand", 2018-06-27) and the test it added it's
intentional that "commit-graph verify" doesn't error out when the file
doesn't exist.

But let's not be overly promiscuous in what we accept. If we can't
read the file for other reasons, e.g. permission errors, bad file
descriptor etc. we'd like to report an error to the user.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email-masked]>
---
 builtin/commit-graph.c  | 4 +++-
 t/t5318-commit-graph.sh | 6 ++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 8196fdbe9c..537fdfd0f0 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -62,8 +62,10 @@ static int graph_verify(int argc, const char **argv)
 
 	graph_name = get_commit_graph_filename(opts.obj_dir);
 	open_ok = open_commit_graph(graph_name, &fd, &st);
-	if (!open_ok)
+	if (!open_ok && errno == ENOENT)
 		return 0;
+	if (!open_ok)
+		die_errno(_("Could not open commit-graph '%s'"), graph_name);
 	graph = load_commit_graph_one_fd_st(fd, &st);
 	FREE_AND_NULL(graph_name);
 
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index 71d775e313..1cb0355c7e 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -400,6 +400,12 @@ corrupt_graph_and_verify() {
 
 }
 
+test_expect_success POSIXPERM,SANITY 'detect permission problem' '
+	corrupt_graph_setup &&
+	chmod 000 $objdir/info/commit-graph &&
+	corrupt_graph_verify "Could not open"
+'
+
 test_expect_success 'detect too small' '
 	corrupt_graph_setup &&
 	echo "a small graph" >$objdir/info/commit-graph &&
-- 
2.21.0.360.g471c308f928