t9300: factor out portable "head -c" replacement

diff --git a/patch-ids.h b/patch-ids.h
index c8c7ca110ad34def12a3594a1560b3c3052eb701..eeb56b307f602773a41ea3b8cb22d89959c4f9d9 100644 (file)
--- a/patch-ids.h
+++ b/patch-ids.h
@@ -13,6 +13,8 @@ struct patch_ids {
        struct patch_id_bucket *patches;
 };
 
+int commit_patch_id(struct commit *commit, struct diff_options *options,
+                   unsigned char *sha1);
 int init_patch_ids(struct patch_ids *);
 int free_patch_ids(struct patch_ids *);
 struct patch_id *add_commit_patch_id(struct commit *, struct patch_ids *);