environment: move access to "core.hooksPath" into repo settings

The "core.hooksPath" setting is stored in a global variable and
populated via the `git_default_core_config`. This may cause issues in
the case where one is handling multiple different repositories in a
single process with different values for that config key, as we may or
may not see the correct value in that case. Furthermore, global state
blocks our path towards libification.

Refactor the code so that we instead store the value in `struct
repo_settings`. The value is computed as-needed and cached. The result
should be functionally the same as there aren't ever any code paths
where we'd execute hooks outside the context of a repository.

Note that this requires us to change the passed-in repository in the
`repo_git_path()` family of functions to be non-constant, as we call
`adjust_git_path()` there.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

repo-settings.c

@@ -146,6 +146,7 @@ void repo_settings_clear(struct repository *r)
 {
 	struct repo_settings empty = REPO_SETTINGS_INIT;
 	FREE_AND_NULL(r->settings.fsmonitor);
+	FREE_AND_NULL(r->settings.hooks_path);
 	r->settings = empty;
 }
 
@@ -173,3 +174,10 @@ int repo_settings_get_warn_ambiguous_refs(struct repository *repo)
 			      &repo->settings.warn_ambiguous_refs, 1);
 	return repo->settings.warn_ambiguous_refs;
 }
+
+const char *repo_settings_get_hooks_path(struct repository *repo)
+{
+	if (!repo->settings.hooks_path)
+		repo_config_get_pathname(repo, "core.hookspath", &repo->settings.hooks_path);
+	return repo->settings.hooks_path;
+}