[PATCH v4 17/25] t/helper/test-read-midx.c: add --checksum mode

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Subsequent tests will want to check for the existence of a multi-pack
bitmap which matches the multi-pack-index stored in the pack directory.

The multi-pack bitmap includes the hex checksum of the MIDX it
corresponds to in its filename (for example,
'$packdir/multi-pack-index-<checksum>.bitmap'). As a result, some tests
want a way to learn what '<checksum>' is.

This helper addresses that need by printing the checksum of the
repository's multi-pack-index.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 t/helper/test-read-midx.c | 16 +++++++++++++++-
 t/lib-bitmap.sh           |  4 ++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/t/helper/test-read-midx.c b/t/helper/test-read-midx.c
index 7c2eb11a8e..cb0d27049a 100644
--- a/t/helper/test-read-midx.c
+++ b/t/helper/test-read-midx.c
@@ -60,12 +60,26 @@ static int read_midx_file(const char *object_dir, int show_objects)
 	return 0;
 }
 
+static int read_midx_checksum(const char *object_dir)
+{
+	struct multi_pack_index *m;
+
+	setup_git_directory();
+	m = load_multi_pack_index(object_dir, 1);
+	if (!m)
+		return 1;
+	printf("%s\n", hash_to_hex(get_midx_checksum(m)));
+	return 0;
+}
+
 int cmd__read_midx(int argc, const char **argv)
 {
 	if (!(argc == 2 || argc == 3))
-		usage("read-midx [--show-objects] <object-dir>");
+		usage("read-midx [--show-objects|--checksum] <object-dir>");
 
 	if (!strcmp(argv[1], "--show-objects"))
 		return read_midx_file(argv[2], 1);
+	else if (!strcmp(argv[1], "--checksum"))
+		return read_midx_checksum(argv[2]);
 	return read_midx_file(argv[1], 0);
 }
diff --git a/t/lib-bitmap.sh b/t/lib-bitmap.sh
index 77464da6fd..21d0392dda 100644
--- a/t/lib-bitmap.sh
+++ b/t/lib-bitmap.sh
@@ -260,3 +260,7 @@ have_delta () {
 	echo $1 | git cat-file --batch-check="%(deltabase)" >actual &&
 	test_cmp expect actual
 }
+
+midx_checksum () {
+	test-tool read-midx --checksum "$1"
+}
-- 
2.31.1.163.ga65ce7f831




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