Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
Documentation/technical/pack-format.txt | 4 ++
builtin/midx.c | 2 +
midx.c | 50 +++++++++++++++++++++++--
object-store.h | 1 +
t/t5319-midx.sh | 4 +-
5 files changed, 55 insertions(+), 6 deletions(-)
diff --git a/Documentation/technical/pack-format.txt
b/Documentation/technical/pack-format.txt
index 29bf87283a..de9ac778b6 100644
--- a/Documentation/technical/pack-format.txt
+++ b/Documentation/technical/pack-format.txt
@@ -307,6 +307,10 @@ CHUNK DATA:
name. This is the only chunk not guaranteed to be a multiple of four
bytes in length, so should be the last chunk for alignment reasons.
+ OID Lookup (ID: {'O', 'I', 'D', 'L'}) (N * H bytes)
+ The OIDs for all objects in the MIDX are stored in lexicographic
+ order in this chunk.
+
(This section intentionally left incomplete.)
TRAILER:
diff --git a/builtin/midx.c b/builtin/midx.c
index 3a261e9bbf..86edd30174 100644
--- a/builtin/midx.c
+++ b/builtin/midx.c
@@ -35,6 +35,8 @@ static int read_midx_file(const char *object_dir)
printf(" pack_lookup");
if (m->chunk_pack_names)
printf(" pack_names");
+ if (m->chunk_oid_lookup)
+ printf(" oid_lookup");
printf("\n");
diff --git a/midx.c b/midx.c
index b20d52713c..d06bc6876a 100644
--- a/midx.c
+++ b/midx.c
@@ -14,10 +14,11 @@
#define MIDX_HASH_LEN 20
#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + MIDX_HASH_LEN)
-#define MIDX_MAX_CHUNKS 2
+#define MIDX_MAX_CHUNKS 3
#define MIDX_CHUNK_ALIGNMENT 4
#define MIDX_CHUNKID_PACKLOOKUP 0x504c4f4f /* "PLOO" */
#define MIDX_CHUNKID_PACKNAMES 0x504e414d /* "PNAM" */
+#define MIDX_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
#define MIDX_CHUNKLOOKUP_WIDTH (sizeof(uint32_t) + sizeof(uint64_t))
static char *get_midx_filename(const char *object_dir)
@@ -95,6 +96,10 @@ struct midxed_git *load_midxed_git(const char *object_dir)
m->chunk_pack_names = m->data + chunk_offset;
break;
+ case MIDX_CHUNKID_OIDLOOKUP:
+ m->chunk_oid_lookup = m->data + chunk_offset;
+ break;
+
case 0:
die("terminating MIDX chunk id appears earlier
than expected");
break;
@@ -112,6 +117,8 @@ struct midxed_git *load_midxed_git(const char *object_dir)
die("MIDX missing required pack lookup chunk");
if (!m->chunk_pack_names)
die("MIDX missing required pack-name chunk");
+ if (!m->chunk_oid_lookup)
+ die("MIDX missing required OID lookup chunk");
m->pack_names = xcalloc(m->num_packs, sizeof(const char *));
for (i = 0; i < m->num_packs; i++) {
@@ -370,6 +377,32 @@ static size_t write_midx_pack_names(struct hashfile *f,
return written;
}
+static size_t write_midx_oid_lookup(struct hashfile *f, unsigned char hash_len,
+ struct pack_midx_entry *objects,
+ uint32_t nr_objects)
+{
+ struct pack_midx_entry *list = objects;
+ uint32_t i;
+ size_t written = 0;
+
+ for (i = 0; i < nr_objects; i++) {
+ struct pack_midx_entry *obj = list++;
+
+ if (i < nr_objects - 1) {
+ struct pack_midx_entry *next = list;
+ if (oidcmp(&obj->oid, &next->oid) >= 0)
+ BUG("OIDs not in order: %s >= %s",
+ oid_to_hex(&obj->oid),
+ oid_to_hex(&next->oid));
+ }
+
+ hashwrite(f, obj->oid.hash, (int)hash_len);
+ written += hash_len;
+ }
+
+ return written;
+}
+
int write_midx_file(const char *object_dir)
{
unsigned char cur_chunk, num_chunks = 0;
@@ -389,6 +422,7 @@ int write_midx_file(const char *object_dir)
uint64_t written = 0;
uint32_t chunk_ids[MIDX_MAX_CHUNKS + 1];
uint64_t chunk_offsets[MIDX_MAX_CHUNKS + 1];
+ struct pack_midx_entry *entries;
uint32_t nr_entries;
midx_name = get_midx_filename(object_dir);
@@ -448,14 +482,14 @@ int write_midx_file(const char *object_dir)
ALLOC_ARRAY(pack_perm, nr_packs);
sort_packs_by_name(pack_names, nr_packs, pack_perm);
- get_sorted_entries(packs, pack_perm, nr_packs, &nr_entries);
+ entries = get_sorted_entries(packs, pack_perm, nr_packs, &nr_entries);
hold_lock_file_for_update(&lk, midx_name, LOCK_DIE_ON_ERROR);
f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
FREE_AND_NULL(midx_name);
cur_chunk = 0;
- num_chunks = 2;
+ num_chunks = 3;
written = write_midx_header(f, num_chunks, nr_packs);
@@ -467,9 +501,13 @@ int write_midx_file(const char *object_dir)
chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_packs *
sizeof(uint32_t);
cur_chunk++;
- chunk_ids[cur_chunk] = 0;
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDLOOKUP;
chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] +
pack_name_concat_len;
+ cur_chunk++;
+ chunk_ids[cur_chunk] = 0;
+ chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries *
MIDX_HASH_LEN;
+
for (i = 0; i <= num_chunks; i++) {
if (i && chunk_offsets[i] < chunk_offsets[i - 1])
BUG("incorrect chunk offsets: %"PRIu64" before %"PRIu64,
@@ -503,6 +541,10 @@ int write_midx_file(const char *object_dir)
written += write_midx_pack_names(f, pack_names,
nr_packs);
break;
+ case MIDX_CHUNKID_OIDLOOKUP:
+ written += write_midx_oid_lookup(f,
MIDX_HASH_LEN, entries, nr_entries);
+ break;
+
default:
BUG("trying to write unknown chunk id %"PRIx32,
chunk_ids[i]);
diff --git a/object-store.h b/object-store.h
index 1ba50459ca..7d14d3586e 100644
--- a/object-store.h
+++ b/object-store.h
@@ -102,6 +102,7 @@ struct midxed_git {
const uint32_t *chunk_pack_lookup;
const unsigned char *chunk_pack_names;
+ const unsigned char *chunk_oid_lookup;
const char **pack_names;
char object_dir[FLEX_ARRAY];
diff --git a/t/t5319-midx.sh b/t/t5319-midx.sh
index a31c387c8f..e71aa52b80 100755
--- a/t/t5319-midx.sh
+++ b/t/t5319-midx.sh
@@ -6,8 +6,8 @@ test_description='multi-pack-indexes'
midx_read_expect() {
NUM_PACKS=$1
cat >expect <<- EOF
- header: 4d494458 1 1 2 $NUM_PACKS
- chunks: pack_lookup pack_names
+ header: 4d494458 1 1 3 $NUM_PACKS
+ chunks: pack_lookup pack_names oid_lookup
packs:
EOF
if [ $NUM_PACKS -ge 1 ]
--
2.18.0.rc1
