[PATCH v2] git config: report when trying to modify a non-existing repo config

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It is a pilot error to call `git config section.key value` outside of
any Git worktree. The message

	error: could not lock config file .git/config: No such file or
	directory

is not very helpful in that situation, though. Let's print a helpful
message instead.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 builtin/config.c      | 3 +++
 t/t1308-config-set.sh | 9 +++++++++
 2 files changed, 12 insertions(+)

The commit message was adjusted to reflect that this is not a bug fix
(except for Git for Windows), and a test was added.

Interdiff vs v1:

 diff --git a/t/t1308-config-set.sh b/t/t1308-config-set.sh
 index 91235b7..f62409e 100755
 --- a/t/t1308-config-set.sh
 +++ b/t/t1308-config-set.sh
 @@ -218,4 +218,13 @@ test_expect_success 'check line errors for malformed values' '
  	test_i18ngrep "fatal: .*alias\.br.*\.git/config.*line 2" result
  '
  
 +test_expect_success 'error on modifying repo config without repo' '
 +	mkdir no-repo &&
 +	GIT_CEILING_DIRECTORIES=$(pwd) &&
 +	export GIT_CEILING_DIRECTORIES &&
 +	cd no-repo &&
 +	test_must_fail git config a.b c 2>err &&
 +	grep "not in a git directory" err
 +'
 +
  test_done


diff --git a/builtin/config.c b/builtin/config.c
index adc7727..78aab95 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -352,6 +352,9 @@ static int get_colorbool(const char *var, int print)
 
 static void check_write(void)
 {
+	if (!given_config_source.file && !startup_info->have_repository)
+		die("not in a git directory");
+
 	if (given_config_source.use_stdin)
 		die("writing to stdin is not supported");
 
diff --git a/t/t1308-config-set.sh b/t/t1308-config-set.sh
index 91235b7..f62409e 100755
--- a/t/t1308-config-set.sh
+++ b/t/t1308-config-set.sh
@@ -218,4 +218,13 @@ test_expect_success 'check line errors for malformed values' '
 	test_i18ngrep "fatal: .*alias\.br.*\.git/config.*line 2" result
 '
 
+test_expect_success 'error on modifying repo config without repo' '
+	mkdir no-repo &&
+	GIT_CEILING_DIRECTORIES=$(pwd) &&
+	export GIT_CEILING_DIRECTORIES &&
+	cd no-repo &&
+	test_must_fail git config a.b c 2>err &&
+	grep "not in a git directory" err
+'
+
 test_done
-- 
2.7.2.windows.1.2.gbc859c8
--
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