In the first case, we already correctly return -1 if fopen() fails to
open. But we should report something so people know what's wrong.

In the second case, config_file == NULL does not necessarily mean "no
config file". Bail out if needed.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 config.c              | 5 ++++-
 t/t1308-config-set.sh | 4 +++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/config.c b/config.c
index b4a3205da3..e54d99d519 100644
--- a/config.c
+++ b/config.c
@@ -1422,7 +1422,7 @@ int git_config_from_file(config_fn_t fn, const char 
*filename, void *data)
        int ret = -1;
        FILE *f;
 
-       f = fopen(filename, "r");
+       f = fopen_or_warn(filename, "r");
        if (f) {
                flockfile(f);
                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, 
filename, f, data);
@@ -2640,6 +2640,9 @@ int git_config_rename_section_in_file(const char 
*config_filename,
        }
 
        if (!(config_file = fopen(config_filename, "rb"))) {
+               ret = warn_on_fopen_errors(config_filename);
+               if (ret)
+                       goto out;
                /* no config file means nothing to rename, no error */
                goto commit_and_out;
        }
diff --git a/t/t1308-config-set.sh b/t/t1308-config-set.sh
index ff50960cca..13e95561f4 100755
--- a/t/t1308-config-set.sh
+++ b/t/t1308-config-set.sh
@@ -187,7 +187,9 @@ test_expect_success POSIXPERM,SANITY 'proper error on 
non-accessible files' '
        chmod -r .git/config &&
        test_when_finished "chmod +r .git/config" &&
        echo "Error (-1) reading configuration file .git/config." >expect &&
-       test_expect_code 2 test-config configset_get_value foo.bar .git/config 
2>actual &&
+       test_expect_code 2 test-config configset_get_value foo.bar .git/config 
2>output &&
+       grep "^warning:" output &&
+       grep "^Error" output >actual &&
        test_cmp expect actual
 '
 
-- 
2.11.0.157.gd943d85

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