Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
Documentation/technical/pack-format.txt | 5 +++
builtin/midx.c | 7 ++++
midx.c | 56 +++++++++++++++++++++++--
object-store.h | 2 +
t/t5319-midx.sh | 11 +++--
5 files changed, 75 insertions(+), 6 deletions(-)
diff --git a/Documentation/technical/pack-format.txt b/Documentation/technical/pack-format.txt
index 2b37be7b33..29bf87283a 100644
--- a/Documentation/technical/pack-format.txt
+++ b/Documentation/technical/pack-format.txt
@@ -296,6 +296,11 @@ CHUNK LOOKUP:
CHUNK DATA:
+ Packfile Name Lookup (ID: {'P', 'L', 'O', 'O'}) (P * 4 bytes)
+ P * 4 bytes storing the offset in the packfile name chunk for
+ the null-terminated string containing the filename for the
+ ith packfile.
+
Packfile Names (ID: {'P', 'N', 'A', 'M'})
Stores the packfile names as concatenated, null-terminated strings.
Packfiles must be listed in lexicographic order for fast lookups by
diff --git a/builtin/midx.c b/builtin/midx.c
index fe56560853..3a261e9bbf 100644
--- a/builtin/midx.c
+++ b/builtin/midx.c
@@ -16,6 +16,7 @@ static struct opts_midx {
static int read_midx_file(const char *object_dir)
{
+ uint32_t i;
struct midxed_git *m = load_midxed_git(object_dir);
if (!m)
@@ -30,11 +31,17 @@ static int read_midx_file(const char *object_dir)
printf("chunks:");
+ if (m->chunk_pack_lookup)
+ printf(" pack_lookup");
if (m->chunk_pack_names)
printf(" pack_names");
printf("\n");
+ printf("packs:\n");
+ for (i = 0; i < m->num_packs; i++)
+ printf("%s\n", m->pack_names[i]);
+
printf("object_dir: %s\n", m->object_dir);
return 0;
diff --git a/midx.c b/midx.c
index d4f4a01a51..923acda72e 100644
--- a/midx.c
+++ b/midx.c
@@ -13,8 +13,9 @@
#define MIDX_HASH_LEN 20
#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + MIDX_HASH_LEN)
-#define MIDX_MAX_CHUNKS 1
+#define MIDX_MAX_CHUNKS 2
#define MIDX_CHUNK_ALIGNMENT 4
+#define MIDX_CHUNKID_PACKLOOKUP 0x504c4f4f /* "PLOO" */
#define MIDX_CHUNKID_PACKNAMES 0x504e414d /* "PNAM" */
#define MIDX_CHUNKLOOKUP_WIDTH (sizeof(uint32_t) + sizeof(uint64_t))
@@ -85,6 +86,10 @@ struct midxed_git *load_midxed_git(const char *object_dir)
uint64_t chunk_offset = get_be64(m->data + 16 + MIDX_CHUNKLOOKUP_WIDTH * i);
switch (chunk_id) {
+ case MIDX_CHUNKID_PACKLOOKUP:
+ m->chunk_pack_lookup = (uint32_t *)(m->data + chunk_offset);
+ break;
+
case MIDX_CHUNKID_PACKNAMES:
m->chunk_pack_names = m->data + chunk_offset;
break;
@@ -102,9 +107,32 @@ struct midxed_git *load_midxed_git(const char *object_dir)
}
}
+ if (!m->chunk_pack_lookup)
+ die("MIDX missing required pack lookup chunk");
if (!m->chunk_pack_names)
die("MIDX missing required pack-name chunk");
+ m->pack_names = xcalloc(m->num_packs, sizeof(const char *));
+ for (i = 0; i < m->num_packs; i++) {
+ if (i) {
+ if (ntohl(m->chunk_pack_lookup[i]) <= ntohl(m->chunk_pack_lookup[i - 1])) {
+ error("MIDX pack lookup value %d before %d",
+ ntohl(m->chunk_pack_lookup[i - 1]),
+ ntohl(m->chunk_pack_lookup[i]));
+ goto cleanup_fail;
+ }
+ }
+
+ m->pack_names[i] = (const char *)(m->chunk_pack_names + ntohl(m->chunk_pack_lookup[i]));
+
+ if (i && strcmp(m->pack_names[i], m->pack_names[i - 1]) <= 0) {
+ error("MIDX pack names out of order: '%s' before '%s'",
+ m->pack_names[i - 1],
+ m->pack_names[i]);
+ goto cleanup_fail;
+ }
+ }
+
return m;
cleanup_fail:
@@ -162,6 +190,20 @@ static void sort_packs_by_name(char **pack_names, uint32_t nr_packs, uint32_t *p
}
}
+static size_t write_midx_pack_lookup(struct hashfile *f,
+ char **pack_names,
+ uint32_t nr_packs)
+{
+ uint32_t i, cur_len = 0;
+
+ for (i = 0; i < nr_packs; i++) {
+ hashwrite_be32(f, cur_len);
+ cur_len += strlen(pack_names[i]) + 1;
+ }
+
+ return sizeof(uint32_t) * (size_t)nr_packs;
+}
+
static size_t write_midx_pack_names(struct hashfile *f,
char **pack_names,
uint32_t num_packs)
@@ -275,13 +317,17 @@ int write_midx_file(const char *object_dir)
FREE_AND_NULL(midx_name);
cur_chunk = 0;
- num_chunks = 1;
+ num_chunks = 2;
written = write_midx_header(f, num_chunks, nr_packs);
- chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKNAMES;
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKLOOKUP;
chunk_offsets[cur_chunk] = written + (num_chunks + 1) * MIDX_CHUNKLOOKUP_WIDTH;
+ cur_chunk++;
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKNAMES;
+ chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_packs * sizeof(uint32_t);
+
cur_chunk++;
chunk_ids[cur_chunk] = 0;
chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + pack_name_concat_len;
@@ -311,6 +357,10 @@ int write_midx_file(const char *object_dir)
chunk_ids[i]);
switch (chunk_ids[i]) {
+ case MIDX_CHUNKID_PACKLOOKUP:
+ written += write_midx_pack_lookup(f, pack_names, nr_packs);
+ break;
+
case MIDX_CHUNKID_PACKNAMES:
written += write_midx_pack_names(f, pack_names, nr_packs);
break;
diff --git a/object-store.h b/object-store.h
index 199cf4bd44..1ba50459ca 100644
--- a/object-store.h
+++ b/object-store.h
@@ -100,8 +100,10 @@ struct midxed_git {
uint32_t num_packs;
uint32_t num_objects;
+ const uint32_t *chunk_pack_lookup;
const unsigned char *chunk_pack_names;
+ const char **pack_names;
char object_dir[FLEX_ARRAY];
};
diff --git a/t/t5319-midx.sh b/t/t5319-midx.sh
index fdf4f84a90..a31c387c8f 100755
--- a/t/t5319-midx.sh
+++ b/t/t5319-midx.sh
@@ -6,10 +6,15 @@ test_description='multi-pack-indexes'
midx_read_expect() {
NUM_PACKS=$1
cat >expect <<- EOF
- header: 4d494458 1 1 1 $NUM_PACKS
- chunks: pack_names
- object_dir: .
+ header: 4d494458 1 1 2 $NUM_PACKS
+ chunks: pack_lookup pack_names
+ packs:
EOF
+ if [ $NUM_PACKS -ge 1 ]
+ then
+ ls pack/ | grep idx | sort >> expect
+ fi
+ printf "object_dir: .\n" >>expect &&
git midx read --object-dir=. >actual &&
test_cmp expect actual
}
--
2.18.0.rc1
