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-rw-r--r--builtin-pack-objects.c237
1 files changed, 157 insertions, 80 deletions
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index a8dc225a7..70d2f5d41 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -28,7 +28,8 @@ git-pack-objects [{ -q | --progress | --all-progress }] \n\
[--window=N] [--window-memory=N] [--depth=N] \n\
[--no-reuse-delta] [--no-reuse-object] [--delta-base-offset] \n\
[--threads=N] [--non-empty] [--revs [--unpacked | --all]*] [--reflog] \n\
- [--stdout | base-name] [--include-tag] [--keep-unreachable] \n\
+ [--stdout | base-name] [--include-tag] \n\
+ [--keep-unreachable | --unpack-unreachable] \n\
[<ref-list | <object-list]";
struct object_entry {
@@ -43,6 +44,7 @@ struct object_entry {
*/
void *delta_data; /* cached delta (uncompressed) */
unsigned long delta_size; /* delta data size (uncompressed) */
+ unsigned long z_delta_size; /* delta data size (compressed) */
unsigned int hash; /* name hint hash */
enum object_type type;
enum object_type in_pack_type; /* could be delta */
@@ -65,7 +67,8 @@ static struct pack_idx_entry **written_list;
static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
static int non_empty;
-static int no_reuse_delta, no_reuse_object, keep_unreachable, include_tag;
+static int reuse_delta = 1, reuse_object = 1;
+static int keep_unreachable, unpack_unreachable, include_tag;
static int local;
static int incremental;
static int allow_ofs_delta;
@@ -102,24 +105,53 @@ static uint32_t written, written_delta;
static uint32_t reused, reused_delta;
-static void *delta_against(void *buf, unsigned long size, struct object_entry *entry)
+static void *get_delta(struct object_entry *entry)
{
- unsigned long othersize, delta_size;
+ unsigned long size, base_size, delta_size;
+ void *buf, *base_buf, *delta_buf;
enum object_type type;
- void *otherbuf = read_sha1_file(entry->delta->idx.sha1, &type, &othersize);
- void *delta_buf;
- if (!otherbuf)
+ buf = read_sha1_file(entry->idx.sha1, &type, &size);
+ if (!buf)
+ die("unable to read %s", sha1_to_hex(entry->idx.sha1));
+ base_buf = read_sha1_file(entry->delta->idx.sha1, &type, &base_size);
+ if (!base_buf)
die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
- delta_buf = diff_delta(otherbuf, othersize,
+ delta_buf = diff_delta(base_buf, base_size,
buf, size, &delta_size, 0);
- if (!delta_buf || delta_size != entry->delta_size)
+ if (!delta_buf || delta_size != entry->delta_size)
die("delta size changed");
- free(buf);
- free(otherbuf);
+ free(buf);
+ free(base_buf);
return delta_buf;
}
+static unsigned long do_compress(void **pptr, unsigned long size)
+{
+ z_stream stream;
+ void *in, *out;
+ unsigned long maxsize;
+
+ memset(&stream, 0, sizeof(stream));
+ deflateInit(&stream, pack_compression_level);
+ maxsize = deflateBound(&stream, size);
+
+ in = *pptr;
+ out = xmalloc(maxsize);
+ *pptr = out;
+
+ stream.next_in = in;
+ stream.avail_in = size;
+ stream.next_out = out;
+ stream.avail_out = maxsize;
+ while (deflate(&stream, Z_FINISH) == Z_OK)
+ ; /* nothing */
+ deflateEnd(&stream);
+
+ free(in);
+ return stream.total_out;
+}
+
/*
* The per-object header is a pretty dense thing, which is
* - first byte: low four bits are "size", then three bits of "type",
@@ -222,42 +254,42 @@ static unsigned long write_object(struct sha1file *f,
struct object_entry *entry,
off_t write_offset)
{
- unsigned long size;
- enum object_type type;
+ unsigned long size, limit, datalen;
void *buf;
- unsigned char header[10];
- unsigned char dheader[10];
+ unsigned char header[10], dheader[10];
unsigned hdrlen;
- off_t datalen;
- enum object_type obj_type;
- int to_reuse = 0;
- /* write limit if limited packsize and not first object */
- unsigned long limit = pack_size_limit && nr_written ?
- pack_size_limit - write_offset : 0;
- /* no if no delta */
- int usable_delta = !entry->delta ? 0 :
- /* yes if unlimited packfile */
- !pack_size_limit ? 1 :
- /* no if base written to previous pack */
- entry->delta->idx.offset == (off_t)-1 ? 0 :
- /* otherwise double-check written to this
- * pack, like we do below
- */
- entry->delta->idx.offset ? 1 : 0;
+ enum object_type type;
+ int usable_delta, to_reuse;
if (!pack_to_stdout)
crc32_begin(f);
- obj_type = entry->type;
- if (no_reuse_object)
+ type = entry->type;
+
+ /* write limit if limited packsize and not first object */
+ limit = pack_size_limit && nr_written ?
+ pack_size_limit - write_offset : 0;
+
+ if (!entry->delta)
+ usable_delta = 0; /* no delta */
+ else if (!pack_size_limit)
+ usable_delta = 1; /* unlimited packfile */
+ else if (entry->delta->idx.offset == (off_t)-1)
+ usable_delta = 0; /* base was written to another pack */
+ else if (entry->delta->idx.offset)
+ usable_delta = 1; /* base already exists in this pack */
+ else
+ usable_delta = 0; /* base could end up in another pack */
+
+ if (!reuse_object)
to_reuse = 0; /* explicit */
else if (!entry->in_pack)
to_reuse = 0; /* can't reuse what we don't have */
- else if (obj_type == OBJ_REF_DELTA || obj_type == OBJ_OFS_DELTA)
+ else if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA)
/* check_object() decided it for us ... */
to_reuse = usable_delta;
/* ... but pack split may override that */
- else if (obj_type != entry->in_pack_type)
+ else if (type != entry->in_pack_type)
to_reuse = 0; /* pack has delta which is unusable */
else if (entry->delta)
to_reuse = 0; /* we want to pack afresh */
@@ -267,50 +299,42 @@ static unsigned long write_object(struct sha1file *f,
*/
if (!to_reuse) {
- z_stream stream;
- unsigned long maxsize;
- void *out;
if (!usable_delta) {
- buf = read_sha1_file(entry->idx.sha1, &obj_type, &size);
+ buf = read_sha1_file(entry->idx.sha1, &type, &size);
if (!buf)
die("unable to read %s", sha1_to_hex(entry->idx.sha1));
+ /*
+ * make sure no cached delta data remains from a
+ * previous attempt before a pack split occured.
+ */
+ free(entry->delta_data);
+ entry->delta_data = NULL;
+ entry->z_delta_size = 0;
} else if (entry->delta_data) {
size = entry->delta_size;
buf = entry->delta_data;
entry->delta_data = NULL;
- obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
+ type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
} else {
- buf = read_sha1_file(entry->idx.sha1, &type, &size);
- if (!buf)
- die("unable to read %s", sha1_to_hex(entry->idx.sha1));
- buf = delta_against(buf, size, entry);
+ buf = get_delta(entry);
size = entry->delta_size;
- obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
+ type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
}
- /* compress the data to store and put compressed length in datalen */
- memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, pack_compression_level);
- maxsize = deflateBound(&stream, size);
- out = xmalloc(maxsize);
- /* Compress it */
- stream.next_in = buf;
- stream.avail_in = size;
- stream.next_out = out;
- stream.avail_out = maxsize;
- while (deflate(&stream, Z_FINISH) == Z_OK)
- /* nothing */;
- deflateEnd(&stream);
- datalen = stream.total_out;
+
+ if (entry->z_delta_size)
+ datalen = entry->z_delta_size;
+ else
+ datalen = do_compress(&buf, size);
/*
* The object header is a byte of 'type' followed by zero or
* more bytes of length.
*/
- hdrlen = encode_header(obj_type, size, header);
+ hdrlen = encode_header(type, size, header);
- if (obj_type == OBJ_OFS_DELTA) {
+ if (type == OBJ_OFS_DELTA) {
/*
* Deltas with relative base contain an additional
* encoding of the relative offset for the delta
@@ -322,20 +346,18 @@ static unsigned long write_object(struct sha1file *f,
while (ofs >>= 7)
dheader[--pos] = 128 | (--ofs & 127);
if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
- free(out);
free(buf);
return 0;
}
sha1write(f, header, hdrlen);
sha1write(f, dheader + pos, sizeof(dheader) - pos);
hdrlen += sizeof(dheader) - pos;
- } else if (obj_type == OBJ_REF_DELTA) {
+ } else if (type == OBJ_REF_DELTA) {
/*
* Deltas with a base reference contain
* an additional 20 bytes for the base sha1.
*/
if (limit && hdrlen + 20 + datalen + 20 >= limit) {
- free(out);
free(buf);
return 0;
}
@@ -344,14 +366,12 @@ static unsigned long write_object(struct sha1file *f,
hdrlen += 20;
} else {
if (limit && hdrlen + datalen + 20 >= limit) {
- free(out);
free(buf);
return 0;
}
sha1write(f, header, hdrlen);
}
- sha1write(f, out, datalen);
- free(out);
+ sha1write(f, buf, datalen);
free(buf);
}
else {
@@ -361,11 +381,11 @@ static unsigned long write_object(struct sha1file *f,
off_t offset;
if (entry->delta) {
- obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
+ type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
reused_delta++;
}
- hdrlen = encode_header(obj_type, entry->size, header);
+ hdrlen = encode_header(type, entry->size, header);
offset = entry->in_pack_offset;
revidx = find_pack_revindex(p, offset);
datalen = revidx[1].offset - offset;
@@ -374,7 +394,7 @@ static unsigned long write_object(struct sha1file *f,
die("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
offset += entry->in_pack_header_size;
datalen -= entry->in_pack_header_size;
- if (obj_type == OBJ_OFS_DELTA) {
+ if (type == OBJ_OFS_DELTA) {
off_t ofs = entry->idx.offset - entry->delta->idx.offset;
unsigned pos = sizeof(dheader) - 1;
dheader[pos] = ofs & 127;
@@ -385,7 +405,7 @@ static unsigned long write_object(struct sha1file *f,
sha1write(f, header, hdrlen);
sha1write(f, dheader + pos, sizeof(dheader) - pos);
hdrlen += sizeof(dheader) - pos;
- } else if (obj_type == OBJ_REF_DELTA) {
+ } else if (type == OBJ_REF_DELTA) {
if (limit && hdrlen + 20 + datalen + 20 >= limit)
return 0;
sha1write(f, header, hdrlen);
@@ -452,11 +472,10 @@ static void write_pack_file(void)
struct sha1file *f;
off_t offset, offset_one, last_obj_offset = 0;
struct pack_header hdr;
- int do_progress = progress >> pack_to_stdout;
uint32_t nr_remaining = nr_result;
time_t last_mtime = 0;
- if (do_progress)
+ if (progress > pack_to_stdout)
progress_state = start_progress("Writing objects", nr_result);
written_list = xmalloc(nr_objects * sizeof(*written_list));
@@ -1022,7 +1041,7 @@ static void check_object(struct object_entry *entry)
unuse_pack(&w_curs);
return;
case OBJ_REF_DELTA:
- if (!no_reuse_delta && !entry->preferred_base)
+ if (reuse_delta && !entry->preferred_base)
base_ref = use_pack(p, &w_curs,
entry->in_pack_offset + used, NULL);
entry->in_pack_header_size = used + 20;
@@ -1045,7 +1064,7 @@ static void check_object(struct object_entry *entry)
die("delta base offset out of bound for %s",
sha1_to_hex(entry->idx.sha1));
ofs = entry->in_pack_offset - ofs;
- if (!no_reuse_delta && !entry->preferred_base) {
+ if (reuse_delta && !entry->preferred_base) {
struct revindex_entry *revidx;
revidx = find_pack_revindex(p, ofs);
base_ref = nth_packed_object_sha1(p, revidx->nr);
@@ -1233,7 +1252,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
* We do not bother to try a delta that we discarded
* on an earlier try, but only when reusing delta data.
*/
- if (!no_reuse_delta && trg_entry->in_pack &&
+ if (reuse_delta && trg_entry->in_pack &&
trg_entry->in_pack == src_entry->in_pack &&
trg_entry->in_pack_type != OBJ_REF_DELTA &&
trg_entry->in_pack_type != OBJ_OFS_DELTA)
@@ -1441,11 +1460,34 @@ static void find_deltas(struct object_entry **list, unsigned *list_size,
best_base = other_idx;
}
+ /*
+ * If we decided to cache the delta data, then it is best
+ * to compress it right away. First because we have to do
+ * it anyway, and doing it here while we're threaded will
+ * save a lot of time in the non threaded write phase,
+ * as well as allow for caching more deltas within
+ * the same cache size limit.
+ * ...
+ * But only if not writing to stdout, since in that case
+ * the network is most likely throttling writes anyway,
+ * and therefore it is best to go to the write phase ASAP
+ * instead, as we can afford spending more time compressing
+ * between writes at that moment.
+ */
+ if (entry->delta_data && !pack_to_stdout) {
+ entry->z_delta_size = do_compress(&entry->delta_data,
+ entry->delta_size);
+ cache_lock();
+ delta_cache_size -= entry->delta_size;
+ delta_cache_size += entry->z_delta_size;
+ cache_unlock();
+ }
+
/* if we made n a delta, and if n is already at max
* depth, leaving it in the window is pointless. we
* should evict it first.
*/
- if (entry->delta && depth <= n->depth)
+ if (entry->delta && max_depth <= n->depth)
continue;
/*
@@ -1688,7 +1730,7 @@ static void prepare_pack(int window, int depth)
if (entry->delta)
/* This happens if we decided to reuse existing
- * delta from a pack. "!no_reuse_delta &&" is implied.
+ * delta from a pack. "reuse_delta &&" is implied.
*/
continue;
@@ -1905,6 +1947,32 @@ static void add_objects_in_unpacked_packs(struct rev_info *revs)
free(in_pack.array);
}
+static void loosen_unused_packed_objects(struct rev_info *revs)
+{
+ struct packed_git *p;
+ uint32_t i;
+ const unsigned char *sha1;
+
+ for (p = packed_git; p; p = p->next) {
+ for (i = 0; i < revs->num_ignore_packed; i++) {
+ if (matches_pack_name(p, revs->ignore_packed[i]))
+ break;
+ }
+ if (revs->num_ignore_packed <= i)
+ continue;
+
+ if (open_pack_index(p))
+ die("cannot open pack index");
+
+ for (i = 0; i < p->num_objects; i++) {
+ sha1 = nth_packed_object_sha1(p, i);
+ if (!locate_object_entry(sha1))
+ if (force_object_loose(sha1, p->mtime))
+ die("unable to force loose object");
+ }
+ }
+}
+
static void get_object_list(int ac, const char **av)
{
struct rev_info revs;
@@ -1939,6 +2007,8 @@ static void get_object_list(int ac, const char **av)
if (keep_unreachable)
add_objects_in_unpacked_packs(&revs);
+ if (unpack_unreachable)
+ loosen_unused_packed_objects(&revs);
}
static int adjust_perm(const char *path, mode_t mode)
@@ -2050,11 +2120,11 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
continue;
}
if (!strcmp("--no-reuse-delta", arg)) {
- no_reuse_delta = 1;
+ reuse_delta = 0;
continue;
}
if (!strcmp("--no-reuse-object", arg)) {
- no_reuse_object = no_reuse_delta = 1;
+ reuse_object = reuse_delta = 0;
continue;
}
if (!strcmp("--delta-base-offset", arg)) {
@@ -2073,6 +2143,10 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
keep_unreachable = 1;
continue;
}
+ if (!strcmp("--unpack-unreachable", arg)) {
+ unpack_unreachable = 1;
+ continue;
+ }
if (!strcmp("--include-tag", arg)) {
include_tag = 1;
continue;
@@ -2138,6 +2212,9 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
if (!pack_to_stdout && thin)
die("--thin cannot be used to build an indexable pack.");
+ if (keep_unreachable && unpack_unreachable)
+ die("--keep-unreachable and --unpack-unreachable are incompatible.");
+
#ifdef THREADED_DELTA_SEARCH
if (!delta_search_threads) /* --threads=0 means autodetect */
delta_search_threads = online_cpus();
generated by cgit v1.2.1 (git 2.18.0) at 2024-08-02 16:35:48 +0000