repack: move `write_cruft_pack()` out of the builtin

In an identical fashion as the previous commit, move the function
`write_cruft_pack()` into its own compilation unit, and make the
function visible through the repack.h API.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/repack.h b/repack.h
index c790c90ef8..3a688a12ee 100644
--- a/repack.h
+++ b/repack.h
@@ -137,4 +137,10 @@ int write_filtered_pack(const struct write_pack_opts *opts,
 			struct existing_packs *existing,
 			struct string_list *names);
 
+int write_cruft_pack(const struct write_pack_opts *opts,
+		     const char *cruft_expiration,
+		     unsigned long combine_cruft_below_size,
+		     struct string_list *names,
+		     struct existing_packs *existing);
+
 #endif /* REPACK_H */