run-command: refactor subprocess env preparation

submodule.c has functionality that prepares the environment for running
a subprocess in a new repo. The lazy-fetching code (used in partial
clones) will need this in a subsequent commit, so move it to a more
central location.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/run-command.h b/run-command.h
index d08414a92e..22132536a9 100644
--- a/run-command.h
+++ b/run-command.h
@@ -483,4 +483,14 @@ int run_processes_parallel_tr2(int n, get_next_task_fn, start_failure_fn,
 			       task_finished_fn, void *pp_cb,
 			       const char *tr2_category, const char *tr2_label);
 
+/**
+ * Convenience function which prepares env_array for a command to be run in a
+ * new repo. This adds all GIT_* environment variables to env_array with the
+ * exception of GIT_CONFIG_PARAMETERS and GIT_CONFIG_COUNT (which cause the
+ * corresponding environment variables to be unset in the subprocess) and adds
+ * an environment variable pointing to new_git_dir. See local_repo_env in
+ * cache.h for more information.
+ */
+void prepare_other_repo_env(struct strvec *env_array, const char *new_git_dir);
+
 #endif