[PATCH] allow commands to be executed in submodules

[Martin Waitz <tali@admingilde.org>]

Add an extra "submodule" field to struct child_process to be able to
easily start commands which are to be executed in a submodule
repository.

Signed-off-by: Martin Waitz <tali@admingilde.org>
---

 run-command.c     |   13 ++++++
 run-command.h     |    1 +
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/run-command.c b/run-command.c
index eff523e..c2475e4 100644
--- a/run-command.c
+++ b/run-command.c
@@ -73,6 +73,19 @@ int start_command(struct child_process *cmd)
 			close(cmd->out);
 		}
 
+		if (cmd->submodule) {
+			int err = chdir(cmd->submodule);
+			if (err) {
+				die("cannot exec %s in %s.",
+					cmd->argv[0], cmd->submodule);
+			}
+			/* don't inherit supermodule environment */
+			unsetenv(GIT_DIR_ENVIRONMENT);
+			unsetenv(DB_ENVIRONMENT);
+			unsetenv(INDEX_ENVIRONMENT);
+			unsetenv(GRAFT_ENVIRONMENT);
+		}
+
 		if (cmd->git_cmd) {
 			execv_git_cmd(cmd->argv);
 		} else {
diff --git a/run-command.h b/run-command.h
index 3680ef9..2940186 100644
--- a/run-command.h
+++ b/run-command.h
@@ -16,6 +16,7 @@ struct child_process {
 	pid_t pid;
 	int in;
 	int out;
+	const char *submodule;
 	unsigned close_in:1;
 	unsigned close_out:1;
 	unsigned no_stdin:1;
-- 
1.5.2.2.g081e


-- 
Martin Waitz