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 <redacted>
---
 run-command.c | 12 ++++++++++++
 run-command.h | 10 ++++++++++
 submodule.c   | 18 ++----------------
 3 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/run-command.c b/run-command.c
index be6bc128cd..549a94a6a4 100644
--- a/run-command.c
+++ b/run-command.c

@@ -1892,3 +1892,15 @@ int run_auto_maintenance(int quiet)

        return run_command(&maint);
 }
+
+void prepare_other_repo_env(struct strvec *env_array, const char *new_git_dir)
+{
+       const char * const *var;
+
+       for (var = local_repo_env; *var; var++) {
+               if (strcmp(*var, CONFIG_DATA_ENVIRONMENT) &&
+                   strcmp(*var, CONFIG_COUNT_ENVIRONMENT))
+                       strvec_push(env_array, *var);
+       }
+       strvec_pushf(env_array, "%s=%s", GIT_DIR_ENVIRONMENT, new_git_dir);
+}

diff --git a/run-command.h b/run-command.h
index d08414a92e..92f1c00b11 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 (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

diff --git a/submodule.c b/submodule.c
index f09031e397..8e611fe1db 100644
--- a/submodule.c
+++ b/submodule.c

@@ -484,28 +484,14 @@ static void print_submodule_diff_summary(struct repository *r, struct rev_info *
        strbuf_release(&sb);
 }

-static void prepare_submodule_repo_env_no_git_dir(struct strvec *out)
-{
-       const char * const *var;
-
-       for (var = local_repo_env; *var; var++) {
-               if (strcmp(*var, CONFIG_DATA_ENVIRONMENT) &&
-                   strcmp(*var, CONFIG_COUNT_ENVIRONMENT))
-                       strvec_push(out, *var);
-       }
-}
-
 void prepare_submodule_repo_env(struct strvec *out)
 {
-       prepare_submodule_repo_env_no_git_dir(out);
-       strvec_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
-                    DEFAULT_GIT_DIR_ENVIRONMENT);
+       prepare_other_repo_env(out, DEFAULT_GIT_DIR_ENVIRONMENT);
 }

 static void prepare_submodule_repo_env_in_gitdir(struct strvec *out)
 {
-       prepare_submodule_repo_env_no_git_dir(out);
-       strvec_pushf(out, "%s=.", GIT_DIR_ENVIRONMENT);
+       prepare_other_repo_env(out, ".");
 }

 /*
--

2.32.0.rc1.229.g3e70b5a671-goog