run_external_diff: use an argv_array for the command line

diff --git a/commit.h b/commit.h
index 8d97a5caa3bd3ff5686f68998102527a3876bc4f..a9f177ba488a7002409eb2cdee1f7e9c3673529f 100644 (file)
--- a/commit.h
+++ b/commit.h
@@ -209,7 +209,7 @@ extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
 extern void setup_alternate_shallow(struct lock_file *shallow_lock,
                                    const char **alternate_shallow_file,
                                    const struct sha1_array *extra);
-extern char *setup_temporary_shallow(const struct sha1_array *extra);
+extern const char *setup_temporary_shallow(const struct sha1_array *extra);
 extern void advertise_shallow_grafts(int);
 
 struct shallow_info {