The return codes for function calls that write the new URL
configuration are not being checked in `set_url`. As the function
is exposed to the user directly through `git remote set-url` we
want to inform her that we were not able to complete the request
and abort the program.

Signed-off-by: Patrick Steinhardt <p...@pks.im>
---
 builtin/remote.c  | 11 ++++++-----
 t/t5505-remote.sh |  9 +++++++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/builtin/remote.c b/builtin/remote.c
index 2b2ff9b..8b78c3d 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -1583,11 +1583,12 @@ static int set_url(int argc, const char **argv)
        /* Special cases that add new entry. */
        if ((!oldurl && !delete_mode) || add_mode) {
                if (add_mode)
-                       git_config_set_multivar(name_buf.buf, newurl,
-                               "^$", 0);
+                       git_config_set_multivar_or_die(name_buf.buf, newurl,
+                                                      "^$", 0);
                else
-                       git_config_set(name_buf.buf, newurl);
+                       git_config_set_or_die(name_buf.buf, newurl);
                strbuf_release(&name_buf);
+
                return 0;
        }
 
@@ -1608,9 +1609,9 @@ static int set_url(int argc, const char **argv)
        regfree(&old_regex);
 
        if (!delete_mode)
-               git_config_set_multivar(name_buf.buf, newurl, oldurl, 0);
+               git_config_set_multivar_or_die(name_buf.buf, newurl, oldurl, 0);
        else
-               git_config_set_multivar(name_buf.buf, NULL, oldurl, 1);
+               git_config_set_multivar_or_die(name_buf.buf, NULL, oldurl, 1);
        return 0;
 }
 
diff --git a/t/t5505-remote.sh b/t/t5505-remote.sh
index 1a8e3b8..e019f27 100755
--- a/t/t5505-remote.sh
+++ b/t/t5505-remote.sh
@@ -932,6 +932,15 @@ test_expect_success 'get-url on new remote' '
        echo foo | get_url_test --push --all someremote
 '
 
+test_expect_success 'remote set-url with locked config' '
+       test_when_finished "rm -f .git/config.lock" &&
+       git config --get-all remote.someremote.url >expect &&
+       >.git/config.lock &&
+       test_must_fail git remote set-url someremote baz &&
+       git config --get-all remote.someremote.url >actual &&
+       cmp expect actual
+'
+
 test_expect_success 'remote set-url bar' '
        git remote set-url someremote bar &&
        echo bar >expect &&
-- 
2.7.0

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