check_connected: accept an env argument

This lets callers influence the environment seen by
rev-list, which will be useful when we start providing
quarantined objects.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

connected.c

@@ -63,6 +63,7 @@ int check_connected(sha1_iterate_fn fn, void *cb_data,
 				 _("Checking connectivity"));
 
 	rev_list.git_cmd = 1;
+	rev_list.env = opt->env;
 	rev_list.in = -1;
 	rev_list.no_stdout = 1;
 	if (opt->err_fd)

connected.h

@@ -33,6 +33,11 @@ struct check_connected_options {
 
 	/* If non-zero, show progress as we traverse the objects. */
 	int progress;
+
+	/*
+	 * Insert these variables into the environment of the child process.
+	 */
+	const char **env;
 };
 
 #define CHECK_CONNECTED_INIT { 0 }