Merge branch 'jh/maint-config-file-prefix' into maint

* jh/maint-config-file-prefix:
builtin-config: Fix crash when using "-f <relative path>" from non-root dir

diff --combined builtin-config.c
index a2d656edb383da47fb3622f1f7c2d1524285ac00,5a5d214bb84c8eefa7ce9a1ca55c5689ce698af5..78724fbf7dd8e2174ac8cc199241641289383c7f
--- 1/builtin-config.c
--- 2/builtin-config.c
+++ b/builtin-config.c
@@@ -316,8 -316,7 +316,8 @@@ int cmd_config(int argc, const char **a
  
        config_exclusive_filename = getenv(CONFIG_ENVIRONMENT);
  
 -      argc = parse_options(argc, argv, builtin_config_options, builtin_config_usage,
 +      argc = parse_options(argc, argv, prefix, builtin_config_options,
 +                           builtin_config_usage,
                             PARSE_OPT_STOP_AT_NON_OPTION);
  
        if (use_global_config + use_system_config + !!given_config_file > 1) {
@@@ -340,7 -339,7 +340,7 @@@
                if (!is_absolute_path(given_config_file) && prefix)
                        config_exclusive_filename = prefix_filename(prefix,
                                                                    strlen(prefix),
-                                                                   argv[2]);
+                                                                   given_config_file);
                else
                        config_exclusive_filename = given_config_file;
        }
@@@ -383,8 -382,8 +383,8 @@@
                check_argc(argc, 0, 0);
                if (git_config(show_all_config, NULL) < 0) {
                        if (config_exclusive_filename)
 -                              die("unable to read config file %s: %s",
 -                                  config_exclusive_filename, strerror(errno));
 +                              die_errno("unable to read config file '%s'",
 +                                        config_exclusive_filename);
                        else
                                die("error processing config file(s)");
                }

diff --combined t/t1300-repo-config.sh
index 83b7294010cd59d5438b6020868c699c01105595,c81ccf2e56659b41787b9da69acbb3bf9f44f984..9e74b1f1415822c758ccc81bd4f12dc15a16eaee
--- 1/t/t1300-repo-config.sh
--- 2/t/t1300-repo-config.sh
+++ b/t/t1300-repo-config.sh
@@@ -398,6 -398,17 +398,17 @@@ test_expect_success 'alternative GIT_CO
  test_expect_success 'alternative GIT_CONFIG (--file)' \
        'git config --file other-config -l > output && cmp output expect'
  
+ test_expect_success 'refer config from subdirectory' '
+       mkdir x &&
+       (
+               cd x &&
+               echo strasse >expect
+               git config --get --file ../other-config ein.bahn >actual &&
+               test_cmp expect actual
+       )
+ 
+ '
+ 
  GIT_CONFIG=other-config git config anwohner.park ausweis
  
  cat > expect << EOF
@@@ -459,28 -470,6 +470,28 @@@ EO
  
  test_expect_success "rename succeeded" "test_cmp expect .git/config"
  
 +cat >> .git/config << EOF
 +[branch "vier"] z = 1
 +EOF
 +
 +test_expect_success "rename a section with a var on the same line" \
 +      'git config --rename-section branch.vier branch.zwei'
 +
 +cat > expect << EOF
 +# Hallo
 +      #Bello
 +[branch "zwei"]
 +      x = 1
 +[branch "zwei"]
 +      y = 1
 +[branch "drei"]
 +weird
 +[branch "zwei"]
 +      z = 1
 +EOF
 +
 +test_expect_success "rename succeeded" "test_cmp expect .git/config"
 +
  cat >> .git/config << EOF
    [branch "zwei"] a = 1 [branch "vier"]
  EOF
@@@ -755,11 -744,6 +766,11 @@@ echo >>resul
  
  test_expect_success '--null --get-regexp' 'cmp result expect'
  
 +test_expect_success 'inner whitespace kept verbatim' '
 +      git config section.val "foo       bar" &&
 +      test "z$(git config section.val)" = "zfoo         bar"
 +'
 +
  test_expect_success SYMLINKS 'symlinked configuration' '
  
        ln -s notyet myconfig &&