[PATCH v3 1/3] midx: teach "git multi-pack-index repack" honor "git repack" configurations

["Son Luong Ngoc via GitGitGadget" <gitgitgadget@gmail.com>]

From: Son Luong Ngoc <sluongng@gmail.com>

Previously, when the "repack" subcommand of "git multi-pack-index" command
creates new packfile(s), it does not call the "git repack" command but
instead directly calls the "git pack-objects" command, and the
configuration variables meant for the "git repack" command, like
"repack.usedaeltabaseoffset", are ignored.

This patch ensured "git multi-pack-index" checks the configuration
variables used by "git repack" and passes the corresponding options to
the underlying "git pack-objects" command.

Note that `repack.writeBitmaps` configuration is ignored, as the
pack bitmap facility is useful only with a single packfile.

Signed-off-by: Son Luong Ngoc <sluongng@gmail.com>
---
 midx.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/midx.c b/midx.c
index 9a61d3b37d9..1e76be56826 100644
--- a/midx.c
+++ b/midx.c
@@ -1369,6 +1369,8 @@ int midx_repack(struct repository *r, const char *object_dir, size_t batch_size,
 	struct child_process cmd = CHILD_PROCESS_INIT;
 	struct strbuf base_name = STRBUF_INIT;
 	struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
+	int delta_base_offset = 1;
+	int use_delta_islands = 0;
 
 	if (!m)
 		return 0;
@@ -1381,12 +1383,20 @@ int midx_repack(struct repository *r, const char *object_dir, size_t batch_size,
 	} else if (fill_included_packs_all(m, include_pack))
 		goto cleanup;
 
+	repo_config_get_bool(r, "repack.usedeltabaseoffset", &delta_base_offset);
+	repo_config_get_bool(r, "repack.usedeltaislands", &use_delta_islands);
+
 	argv_array_push(&cmd.args, "pack-objects");
 
 	strbuf_addstr(&base_name, object_dir);
 	strbuf_addstr(&base_name, "/pack/pack");
 	argv_array_push(&cmd.args, base_name.buf);
 
+	if (delta_base_offset)
+		argv_array_push(&cmd.args, "--delta-base-offset");
+	if (use_delta_islands)
+		argv_array_push(&cmd.args, "--delta-islands");
+
 	if (flags & MIDX_PROGRESS)
 		argv_array_push(&cmd.args, "--progress");
 	else
-- 
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