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[PATCH] config: complain about --local outside of a git repo

On Fri, May 12, 2017 at 10:19:59AM -0400, Josh Hagins wrote:

> Since upgrading to Git 2.13.0 I'm seeing this error message whenever
> `git config --local <whatever>` is called outside a Git repository.
> For example, note the difference in behavior between Git 2.13 and
> Apple Git:
>     $ pwd
>     /Users/jhagins
>     $ /usr/bin/git --version
>     git version 2.11.0 (Apple Git-81)
>     $ /usr/bin/git config --local --get user.name
>     $ /usr/local/bin/git --version
>     git version 2.13.0
>     $ /usr/local/bin/git config --local --get user.name
>     fatal: BUG: setup_git_env called without repository
> Apple Git outputs nothing, as expected. The summarized release notes
> published by GitHub specifically mentioned that instances of this
> error message should be reported, so here you go!

Thanks for reporting. All the developers have been running with this
change for months, but I knew as soon as it was released into the wild
that somebody would find a new corner case. :)

I think dying is the right thing here; you are asking for "--local" but
there is no local repository. But we should never hit a BUG assertion.
Patch is below.

I'm not sure exactly what you wanted to accomplish with --local. If you
just want to know if user.name is set anywhere (and you may or may not
be in a git repo), then just "git config --get user.name" would work. If
you want to know if you're in a local repo and if so whether the
variable is set, you'd need to use two commands, like:

  git rev-parse --git-dir >/dev/null 2>&1 &&
  git config --local --get user.name

-- >8 --
Subject: [PATCH] config: complain about --local outside of a git repo

The "--local" option instructs git-config to read or modify
the repository-level config. This doesn't make any sense if
you're not actually in a repository.

Older versions of Git would blindly try to read or write
".git/config". For reading, this would result in a quiet
failure, since there was no config to read (and thus no
matching config value). Writing would generally fail
noisily, since ".git" was unlikely to exist. But since
b1ef400ee (setup_git_env: avoid blind fall-back to ".git",
2016-10-20), we catch this in the call to git_pathdup() and

Dying is the right thing to do, but we should catch the
problem early and give a more human-friendly error message.

Note that even without --local, git-config will sometimes
default to using local repository config. These cases are
already protected by a similar check.

Signed-off-by: Jeff King <peff@xxxxxxxx>
 builtin/config.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/builtin/config.c b/builtin/config.c
index 3a554ad50..ad7c6a19c 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -496,6 +496,9 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 		usage_with_options(builtin_config_usage, builtin_config_options);
+	if (use_local_config && nongit)
+		die(_("--local only be used inside a git repository"));
 	if (given_config_source.file &&
 			!strcmp(given_config_source.file, "-")) {
 		given_config_source.file = NULL;