blob: 76ce9069467e06545652a70040b79316f0a87fb9 [file] [log] [blame]
#include "builtin.h"
#include "cache.h"
#include "repository.h"
#include "config.h"
#include "attr.h"
#include "object.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree.h"
#include "delta.h"
#include "pack.h"
#include "pack-revindex.h"
#include "csum-file.h"
#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
#include "list-objects.h"
#include "list-objects-filter.h"
#include "list-objects-filter-options.h"
#include "pack-objects.h"
#include "progress.h"
#include "refs.h"
#include "streaming.h"
#include "thread-utils.h"
#include "pack-bitmap.h"
#include "delta-islands.h"
#include "reachable.h"
#include "sha1-array.h"
#include "argv-array.h"
#include "list.h"
#include "packfile.h"
#include "object-store.h"
#include "dir.h"
#include "midx.h"
#include "trace2.h"
#define IN_PACK(obj) oe_in_pack(&to_pack, obj)
#define SIZE(obj) oe_size(&to_pack, obj)
#define SET_SIZE(obj,size) oe_set_size(&to_pack, obj, size)
#define DELTA_SIZE(obj) oe_delta_size(&to_pack, obj)
#define DELTA(obj) oe_delta(&to_pack, obj)
#define DELTA_CHILD(obj) oe_delta_child(&to_pack, obj)
#define DELTA_SIBLING(obj) oe_delta_sibling(&to_pack, obj)
#define SET_DELTA(obj, val) oe_set_delta(&to_pack, obj, val)
#define SET_DELTA_EXT(obj, oid) oe_set_delta_ext(&to_pack, obj, oid)
#define SET_DELTA_SIZE(obj, val) oe_set_delta_size(&to_pack, obj, val)
#define SET_DELTA_CHILD(obj, val) oe_set_delta_child(&to_pack, obj, val)
#define SET_DELTA_SIBLING(obj, val) oe_set_delta_sibling(&to_pack, obj, val)
static const char *pack_usage[] = {
N_("git pack-objects --stdout [<options>...] [< <ref-list> | < <object-list>]"),
N_("git pack-objects [<options>...] <base-name> [< <ref-list> | < <object-list>]"),
NULL
};
/*
* Objects we are going to pack are collected in the `to_pack` structure.
* It contains an array (dynamically expanded) of the object data, and a map
* that can resolve SHA1s to their position in the array.
*/
static struct packing_data to_pack;
static struct pack_idx_entry **written_list;
static uint32_t nr_result, nr_written, nr_seen;
static struct bitmap_index *bitmap_git;
static uint32_t write_layer;
static int non_empty;
static int reuse_delta = 1, reuse_object = 1;
static int keep_unreachable, unpack_unreachable, include_tag;
static timestamp_t unpack_unreachable_expiration;
static int pack_loose_unreachable;
static int local;
static int have_non_local_packs;
static int incremental;
static int ignore_packed_keep_on_disk;
static int ignore_packed_keep_in_core;
static int allow_ofs_delta;
static struct pack_idx_option pack_idx_opts;
static const char *base_name;
static int progress = 1;
static int window = 10;
static unsigned long pack_size_limit;
static int depth = 50;
static int delta_search_threads;
static int pack_to_stdout;
static int sparse;
static int thin;
static int num_preferred_base;
static struct progress *progress_state;
static struct packed_git *reuse_packfile;
static uint32_t reuse_packfile_objects;
static off_t reuse_packfile_offset;
static int use_bitmap_index_default = 1;
static int use_bitmap_index = -1;
static enum {
WRITE_BITMAP_FALSE = 0,
WRITE_BITMAP_QUIET,
WRITE_BITMAP_TRUE,
} write_bitmap_index;
static uint16_t write_bitmap_options = BITMAP_OPT_HASH_CACHE;
static int exclude_promisor_objects;
static int use_delta_islands;
static unsigned long delta_cache_size = 0;
static unsigned long max_delta_cache_size = DEFAULT_DELTA_CACHE_SIZE;
static unsigned long cache_max_small_delta_size = 1000;
static unsigned long window_memory_limit = 0;
static struct list_objects_filter_options filter_options;
enum missing_action {
MA_ERROR = 0, /* fail if any missing objects are encountered */
MA_ALLOW_ANY, /* silently allow ALL missing objects */
MA_ALLOW_PROMISOR, /* silently allow all missing PROMISOR objects */
};
static enum missing_action arg_missing_action;
static show_object_fn fn_show_object;
/*
* stats
*/
static uint32_t written, written_delta;
static uint32_t reused, reused_delta;
/*
* Indexed commits
*/
static struct commit **indexed_commits;
static unsigned int indexed_commits_nr;
static unsigned int indexed_commits_alloc;
static void index_commit_for_bitmap(struct commit *commit)
{
if (indexed_commits_nr >= indexed_commits_alloc) {
indexed_commits_alloc = (indexed_commits_alloc + 32) * 2;
REALLOC_ARRAY(indexed_commits, indexed_commits_alloc);
}
indexed_commits[indexed_commits_nr++] = commit;
}
static void *get_delta(struct object_entry *entry)
{
unsigned long size, base_size, delta_size;
void *buf, *base_buf, *delta_buf;
enum object_type type;
buf = read_object_file(&entry->idx.oid, &type, &size);
if (!buf)
die(_("unable to read %s"), oid_to_hex(&entry->idx.oid));
base_buf = read_object_file(&DELTA(entry)->idx.oid, &type,
&base_size);
if (!base_buf)
die("unable to read %s",
oid_to_hex(&DELTA(entry)->idx.oid));
delta_buf = diff_delta(base_buf, base_size,
buf, size, &delta_size, 0);
/*
* We succesfully computed this delta once but dropped it for
* memory reasons. Something is very wrong if this time we
* recompute and create a different delta.
*/
if (!delta_buf || delta_size != DELTA_SIZE(entry))
BUG("delta size changed");
free(buf);
free(base_buf);
return delta_buf;
}
static unsigned long do_compress(void **pptr, unsigned long size)
{
git_zstream stream;
void *in, *out;
unsigned long maxsize;
git_deflate_init(&stream, pack_compression_level);
maxsize = git_deflate_bound(&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 (git_deflate(&stream, Z_FINISH) == Z_OK)
; /* nothing */
git_deflate_end(&stream);
free(in);
return stream.total_out;
}
static unsigned long write_large_blob_data(struct git_istream *st, struct hashfile *f,
const struct object_id *oid)
{
git_zstream stream;
unsigned char ibuf[1024 * 16];
unsigned char obuf[1024 * 16];
unsigned long olen = 0;
git_deflate_init(&stream, pack_compression_level);
for (;;) {
ssize_t readlen;
int zret = Z_OK;
readlen = read_istream(st, ibuf, sizeof(ibuf));
if (readlen == -1)
die(_("unable to read %s"), oid_to_hex(oid));
stream.next_in = ibuf;
stream.avail_in = readlen;
while ((stream.avail_in || readlen == 0) &&
(zret == Z_OK || zret == Z_BUF_ERROR)) {
stream.next_out = obuf;
stream.avail_out = sizeof(obuf);
zret = git_deflate(&stream, readlen ? 0 : Z_FINISH);
hashwrite(f, obuf, stream.next_out - obuf);
olen += stream.next_out - obuf;
}
if (stream.avail_in)
die(_("deflate error (%d)"), zret);
if (readlen == 0) {
if (zret != Z_STREAM_END)
die(_("deflate error (%d)"), zret);
break;
}
}
git_deflate_end(&stream);
return olen;
}
/*
* we are going to reuse the existing object data as is. make
* sure it is not corrupt.
*/
static int check_pack_inflate(struct packed_git *p,
struct pack_window **w_curs,
off_t offset,
off_t len,
unsigned long expect)
{
git_zstream stream;
unsigned char fakebuf[4096], *in;
int st;
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
do {
in = use_pack(p, w_curs, offset, &stream.avail_in);
stream.next_in = in;
stream.next_out = fakebuf;
stream.avail_out = sizeof(fakebuf);
st = git_inflate(&stream, Z_FINISH);
offset += stream.next_in - in;
} while (st == Z_OK || st == Z_BUF_ERROR);
git_inflate_end(&stream);
return (st == Z_STREAM_END &&
stream.total_out == expect &&
stream.total_in == len) ? 0 : -1;
}
static void copy_pack_data(struct hashfile *f,
struct packed_git *p,
struct pack_window **w_curs,
off_t offset,
off_t len)
{
unsigned char *in;
unsigned long avail;
while (len) {
in = use_pack(p, w_curs, offset, &avail);
if (avail > len)
avail = (unsigned long)len;
hashwrite(f, in, avail);
offset += avail;
len -= avail;
}
}
/* Return 0 if we will bust the pack-size limit */
static unsigned long write_no_reuse_object(struct hashfile *f, struct object_entry *entry,
unsigned long limit, int usable_delta)
{
unsigned long size, datalen;
unsigned char header[MAX_PACK_OBJECT_HEADER],
dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
enum object_type type;
void *buf;
struct git_istream *st = NULL;
const unsigned hashsz = the_hash_algo->rawsz;
if (!usable_delta) {
if (oe_type(entry) == OBJ_BLOB &&
oe_size_greater_than(&to_pack, entry, big_file_threshold) &&
(st = open_istream(&entry->idx.oid, &type, &size, NULL)) != NULL)
buf = NULL;
else {
buf = read_object_file(&entry->idx.oid, &type, &size);
if (!buf)
die(_("unable to read %s"),
oid_to_hex(&entry->idx.oid));
}
/*
* make sure no cached delta data remains from a
* previous attempt before a pack split occurred.
*/
FREE_AND_NULL(entry->delta_data);
entry->z_delta_size = 0;
} else if (entry->delta_data) {
size = DELTA_SIZE(entry);
buf = entry->delta_data;
entry->delta_data = NULL;
type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
} else {
buf = get_delta(entry);
size = DELTA_SIZE(entry);
type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
}
if (st) /* large blob case, just assume we don't compress well */
datalen = size;
else 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_in_pack_object_header(header, sizeof(header),
type, size);
if (type == OBJ_OFS_DELTA) {
/*
* Deltas with relative base contain an additional
* encoding of the relative offset for the delta
* base from this object's position in the pack.
*/
off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset;
unsigned pos = sizeof(dheader) - 1;
dheader[pos] = ofs & 127;
while (ofs >>= 7)
dheader[--pos] = 128 | (--ofs & 127);
if (limit && hdrlen + sizeof(dheader) - pos + datalen + hashsz >= limit) {
if (st)
close_istream(st);
free(buf);
return 0;
}
hashwrite(f, header, hdrlen);
hashwrite(f, dheader + pos, sizeof(dheader) - pos);
hdrlen += sizeof(dheader) - pos;
} else if (type == OBJ_REF_DELTA) {
/*
* Deltas with a base reference contain
* additional bytes for the base object ID.
*/
if (limit && hdrlen + hashsz + datalen + hashsz >= limit) {
if (st)
close_istream(st);
free(buf);
return 0;
}
hashwrite(f, header, hdrlen);
hashwrite(f, DELTA(entry)->idx.oid.hash, hashsz);
hdrlen += hashsz;
} else {
if (limit && hdrlen + datalen + hashsz >= limit) {
if (st)
close_istream(st);
free(buf);
return 0;
}
hashwrite(f, header, hdrlen);
}
if (st) {
datalen = write_large_blob_data(st, f, &entry->idx.oid);
close_istream(st);
} else {
hashwrite(f, buf, datalen);
free(buf);
}
return hdrlen + datalen;
}
/* Return 0 if we will bust the pack-size limit */
static off_t write_reuse_object(struct hashfile *f, struct object_entry *entry,
unsigned long limit, int usable_delta)
{
struct packed_git *p = IN_PACK(entry);
struct pack_window *w_curs = NULL;
struct revindex_entry *revidx;
off_t offset;
enum object_type type = oe_type(entry);
off_t datalen;
unsigned char header[MAX_PACK_OBJECT_HEADER],
dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
const unsigned hashsz = the_hash_algo->rawsz;
unsigned long entry_size = SIZE(entry);
if (DELTA(entry))
type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
hdrlen = encode_in_pack_object_header(header, sizeof(header),
type, entry_size);
offset = entry->in_pack_offset;
revidx = find_pack_revindex(p, offset);
datalen = revidx[1].offset - offset;
if (!pack_to_stdout && p->index_version > 1 &&
check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
error(_("bad packed object CRC for %s"),
oid_to_hex(&entry->idx.oid));
unuse_pack(&w_curs);
return write_no_reuse_object(f, entry, limit, usable_delta);
}
offset += entry->in_pack_header_size;
datalen -= entry->in_pack_header_size;
if (!pack_to_stdout && p->index_version == 1 &&
check_pack_inflate(p, &w_curs, offset, datalen, entry_size)) {
error(_("corrupt packed object for %s"),
oid_to_hex(&entry->idx.oid));
unuse_pack(&w_curs);
return write_no_reuse_object(f, entry, limit, usable_delta);
}
if (type == OBJ_OFS_DELTA) {
off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset;
unsigned pos = sizeof(dheader) - 1;
dheader[pos] = ofs & 127;
while (ofs >>= 7)
dheader[--pos] = 128 | (--ofs & 127);
if (limit && hdrlen + sizeof(dheader) - pos + datalen + hashsz >= limit) {
unuse_pack(&w_curs);
return 0;
}
hashwrite(f, header, hdrlen);
hashwrite(f, dheader + pos, sizeof(dheader) - pos);
hdrlen += sizeof(dheader) - pos;
reused_delta++;
} else if (type == OBJ_REF_DELTA) {
if (limit && hdrlen + hashsz + datalen + hashsz >= limit) {
unuse_pack(&w_curs);
return 0;
}
hashwrite(f, header, hdrlen);
hashwrite(f, DELTA(entry)->idx.oid.hash, hashsz);
hdrlen += hashsz;
reused_delta++;
} else {
if (limit && hdrlen + datalen + hashsz >= limit) {
unuse_pack(&w_curs);
return 0;
}
hashwrite(f, header, hdrlen);
}
copy_pack_data(f, p, &w_curs, offset, datalen);
unuse_pack(&w_curs);
reused++;
return hdrlen + datalen;
}
/* Return 0 if we will bust the pack-size limit */
static off_t write_object(struct hashfile *f,
struct object_entry *entry,
off_t write_offset)
{
unsigned long limit;
off_t len;
int usable_delta, to_reuse;
if (!pack_to_stdout)
crc32_begin(f);
/* apply size limit if limited packsize and not first object */
if (!pack_size_limit || !nr_written)
limit = 0;
else if (pack_size_limit <= write_offset)
/*
* the earlier object did not fit the limit; avoid
* mistaking this with unlimited (i.e. limit = 0).
*/
limit = 1;
else
limit = pack_size_limit - write_offset;
if (!DELTA(entry))
usable_delta = 0; /* no delta */
else if (!pack_size_limit)
usable_delta = 1; /* unlimited packfile */
else if (DELTA(entry)->idx.offset == (off_t)-1)
usable_delta = 0; /* base was written to another pack */
else if (DELTA(entry)->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 (!IN_PACK(entry))
to_reuse = 0; /* can't reuse what we don't have */
else if (oe_type(entry) == OBJ_REF_DELTA ||
oe_type(entry) == OBJ_OFS_DELTA)
/* check_object() decided it for us ... */
to_reuse = usable_delta;
/* ... but pack split may override that */
else if (oe_type(entry) != entry->in_pack_type)
to_reuse = 0; /* pack has delta which is unusable */
else if (DELTA(entry))
to_reuse = 0; /* we want to pack afresh */
else
to_reuse = 1; /* we have it in-pack undeltified,
* and we do not need to deltify it.
*/
if (!to_reuse)
len = write_no_reuse_object(f, entry, limit, usable_delta);
else
len = write_reuse_object(f, entry, limit, usable_delta);
if (!len)
return 0;
if (usable_delta)
written_delta++;
written++;
if (!pack_to_stdout)
entry->idx.crc32 = crc32_end(f);
return len;
}
enum write_one_status {
WRITE_ONE_SKIP = -1, /* already written */
WRITE_ONE_BREAK = 0, /* writing this will bust the limit; not written */
WRITE_ONE_WRITTEN = 1, /* normal */
WRITE_ONE_RECURSIVE = 2 /* already scheduled to be written */
};
static enum write_one_status write_one(struct hashfile *f,
struct object_entry *e,
off_t *offset)
{
off_t size;
int recursing;
/*
* we set offset to 1 (which is an impossible value) to mark
* the fact that this object is involved in "write its base
* first before writing a deltified object" recursion.
*/
recursing = (e->idx.offset == 1);
if (recursing) {
warning(_("recursive delta detected for object %s"),
oid_to_hex(&e->idx.oid));
return WRITE_ONE_RECURSIVE;
} else if (e->idx.offset || e->preferred_base) {
/* offset is non zero if object is written already. */
return WRITE_ONE_SKIP;
}
/* if we are deltified, write out base object first. */
if (DELTA(e)) {
e->idx.offset = 1; /* now recurse */
switch (write_one(f, DELTA(e), offset)) {
case WRITE_ONE_RECURSIVE:
/* we cannot depend on this one */
SET_DELTA(e, NULL);
break;
default:
break;
case WRITE_ONE_BREAK:
e->idx.offset = recursing;
return WRITE_ONE_BREAK;
}
}
e->idx.offset = *offset;
size = write_object(f, e, *offset);
if (!size) {
e->idx.offset = recursing;
return WRITE_ONE_BREAK;
}
written_list[nr_written++] = &e->idx;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(*offset, size))
die(_("pack too large for current definition of off_t"));
*offset += size;
return WRITE_ONE_WRITTEN;
}
static int mark_tagged(const char *path, const struct object_id *oid, int flag,
void *cb_data)
{
struct object_id peeled;
struct object_entry *entry = packlist_find(&to_pack, oid, NULL);
if (entry)
entry->tagged = 1;
if (!peel_ref(path, &peeled)) {
entry = packlist_find(&to_pack, &peeled, NULL);
if (entry)
entry->tagged = 1;
}
return 0;
}
static inline void add_to_write_order(struct object_entry **wo,
unsigned int *endp,
struct object_entry *e)
{
if (e->filled || oe_layer(&to_pack, e) != write_layer)
return;
wo[(*endp)++] = e;
e->filled = 1;
}
static void add_descendants_to_write_order(struct object_entry **wo,
unsigned int *endp,
struct object_entry *e)
{
int add_to_order = 1;
while (e) {
if (add_to_order) {
struct object_entry *s;
/* add this node... */
add_to_write_order(wo, endp, e);
/* all its siblings... */
for (s = DELTA_SIBLING(e); s; s = DELTA_SIBLING(s)) {
add_to_write_order(wo, endp, s);
}
}
/* drop down a level to add left subtree nodes if possible */
if (DELTA_CHILD(e)) {
add_to_order = 1;
e = DELTA_CHILD(e);
} else {
add_to_order = 0;
/* our sibling might have some children, it is next */
if (DELTA_SIBLING(e)) {
e = DELTA_SIBLING(e);
continue;
}
/* go back to our parent node */
e = DELTA(e);
while (e && !DELTA_SIBLING(e)) {
/* we're on the right side of a subtree, keep
* going up until we can go right again */
e = DELTA(e);
}
if (!e) {
/* done- we hit our original root node */
return;
}
/* pass it off to sibling at this level */
e = DELTA_SIBLING(e);
}
};
}
static void add_family_to_write_order(struct object_entry **wo,
unsigned int *endp,
struct object_entry *e)
{
struct object_entry *root;
for (root = e; DELTA(root); root = DELTA(root))
; /* nothing */
add_descendants_to_write_order(wo, endp, root);
}
static void compute_layer_order(struct object_entry **wo, unsigned int *wo_end)
{
unsigned int i, last_untagged;
struct object_entry *objects = to_pack.objects;
for (i = 0; i < to_pack.nr_objects; i++) {
if (objects[i].tagged)
break;
add_to_write_order(wo, wo_end, &objects[i]);
}
last_untagged = i;
/*
* Then fill all the tagged tips.
*/
for (; i < to_pack.nr_objects; i++) {
if (objects[i].tagged)
add_to_write_order(wo, wo_end, &objects[i]);
}
/*
* And then all remaining commits and tags.
*/
for (i = last_untagged; i < to_pack.nr_objects; i++) {
if (oe_type(&objects[i]) != OBJ_COMMIT &&
oe_type(&objects[i]) != OBJ_TAG)
continue;
add_to_write_order(wo, wo_end, &objects[i]);
}
/*
* And then all the trees.
*/
for (i = last_untagged; i < to_pack.nr_objects; i++) {
if (oe_type(&objects[i]) != OBJ_TREE)
continue;
add_to_write_order(wo, wo_end, &objects[i]);
}
/*
* Finally all the rest in really tight order
*/
for (i = last_untagged; i < to_pack.nr_objects; i++) {
if (!objects[i].filled && oe_layer(&to_pack, &objects[i]) == write_layer)
add_family_to_write_order(wo, wo_end, &objects[i]);
}
}
static struct object_entry **compute_write_order(void)
{
uint32_t max_layers = 1;
unsigned int i, wo_end;
struct object_entry **wo;
struct object_entry *objects = to_pack.objects;
for (i = 0; i < to_pack.nr_objects; i++) {
objects[i].tagged = 0;
objects[i].filled = 0;
SET_DELTA_CHILD(&objects[i], NULL);
SET_DELTA_SIBLING(&objects[i], NULL);
}
/*
* Fully connect delta_child/delta_sibling network.
* Make sure delta_sibling is sorted in the original
* recency order.
*/
for (i = to_pack.nr_objects; i > 0;) {
struct object_entry *e = &objects[--i];
if (!DELTA(e))
continue;
/* Mark me as the first child */
e->delta_sibling_idx = DELTA(e)->delta_child_idx;
SET_DELTA_CHILD(DELTA(e), e);
}
/*
* Mark objects that are at the tip of tags.
*/
for_each_tag_ref(mark_tagged, NULL);
if (use_delta_islands)
max_layers = compute_pack_layers(&to_pack);
ALLOC_ARRAY(wo, to_pack.nr_objects);
wo_end = 0;
for (; write_layer < max_layers; ++write_layer)
compute_layer_order(wo, &wo_end);
if (wo_end != to_pack.nr_objects)
die(_("ordered %u objects, expected %"PRIu32),
wo_end, to_pack.nr_objects);
return wo;
}
static off_t write_reused_pack(struct hashfile *f)
{
unsigned char buffer[8192];
off_t to_write, total;
int fd;
if (!is_pack_valid(reuse_packfile))
die(_("packfile is invalid: %s"), reuse_packfile->pack_name);
fd = git_open(reuse_packfile->pack_name);
if (fd < 0)
die_errno(_("unable to open packfile for reuse: %s"),
reuse_packfile->pack_name);
if (lseek(fd, sizeof(struct pack_header), SEEK_SET) == -1)
die_errno(_("unable to seek in reused packfile"));
if (reuse_packfile_offset < 0)
reuse_packfile_offset = reuse_packfile->pack_size - the_hash_algo->rawsz;
total = to_write = reuse_packfile_offset - sizeof(struct pack_header);
while (to_write) {
int read_pack = xread(fd, buffer, sizeof(buffer));
if (read_pack <= 0)
die_errno(_("unable to read from reused packfile"));
if (read_pack > to_write)
read_pack = to_write;
hashwrite(f, buffer, read_pack);
to_write -= read_pack;
/*
* We don't know the actual number of objects written,
* only how many bytes written, how many bytes total, and
* how many objects total. So we can fake it by pretending all
* objects we are writing are the same size. This gives us a
* smooth progress meter, and at the end it matches the true
* answer.
*/
written = reuse_packfile_objects *
(((double)(total - to_write)) / total);
display_progress(progress_state, written);
}
close(fd);
written = reuse_packfile_objects;
display_progress(progress_state, written);
return reuse_packfile_offset - sizeof(struct pack_header);
}
static const char no_split_warning[] = N_(
"disabling bitmap writing, packs are split due to pack.packSizeLimit"
);
static void write_pack_file(void)
{
uint32_t i = 0, j;
struct hashfile *f;
off_t offset;
uint32_t nr_remaining = nr_result;
time_t last_mtime = 0;
struct object_entry **write_order;
if (progress > pack_to_stdout)
progress_state = start_progress(_("Writing objects"), nr_result);
ALLOC_ARRAY(written_list, to_pack.nr_objects);
write_order = compute_write_order();
do {
struct object_id oid;
char *pack_tmp_name = NULL;
if (pack_to_stdout)
f = hashfd_throughput(1, "<stdout>", progress_state);
else
f = create_tmp_packfile(&pack_tmp_name);
offset = write_pack_header(f, nr_remaining);
if (reuse_packfile) {
off_t packfile_size;
assert(pack_to_stdout);
packfile_size = write_reused_pack(f);
offset += packfile_size;
}
nr_written = 0;
for (; i < to_pack.nr_objects; i++) {
struct object_entry *e = write_order[i];
if (write_one(f, e, &offset) == WRITE_ONE_BREAK)
break;
display_progress(progress_state, written);
}
/*
* Did we write the wrong # entries in the header?
* If so, rewrite it like in fast-import
*/
if (pack_to_stdout) {
finalize_hashfile(f, oid.hash, CSUM_HASH_IN_STREAM | CSUM_CLOSE);
} else if (nr_written == nr_remaining) {
finalize_hashfile(f, oid.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE);
} else {
int fd = finalize_hashfile(f, oid.hash, 0);
fixup_pack_header_footer(fd, oid.hash, pack_tmp_name,
nr_written, oid.hash, offset);
close(fd);
if (write_bitmap_index) {
if (write_bitmap_index != WRITE_BITMAP_QUIET)
warning(_(no_split_warning));
write_bitmap_index = 0;
}
}
if (!pack_to_stdout) {
struct stat st;
struct strbuf tmpname = STRBUF_INIT;
/*
* Packs are runtime accessed in their mtime
* order since newer packs are more likely to contain
* younger objects. So if we are creating multiple
* packs then we should modify the mtime of later ones
* to preserve this property.
*/
if (stat(pack_tmp_name, &st) < 0) {
warning_errno(_("failed to stat %s"), pack_tmp_name);
} else if (!last_mtime) {
last_mtime = st.st_mtime;
} else {
struct utimbuf utb;
utb.actime = st.st_atime;
utb.modtime = --last_mtime;
if (utime(pack_tmp_name, &utb) < 0)
warning_errno(_("failed utime() on %s"), pack_tmp_name);
}
strbuf_addf(&tmpname, "%s-", base_name);
if (write_bitmap_index) {
bitmap_writer_set_checksum(oid.hash);
bitmap_writer_build_type_index(
&to_pack, written_list, nr_written);
}
finish_tmp_packfile(&tmpname, pack_tmp_name,
written_list, nr_written,
&pack_idx_opts, oid.hash);
if (write_bitmap_index) {
strbuf_addf(&tmpname, "%s.bitmap", oid_to_hex(&oid));
stop_progress(&progress_state);
bitmap_writer_show_progress(progress);
bitmap_writer_reuse_bitmaps(&to_pack);
bitmap_writer_select_commits(indexed_commits, indexed_commits_nr, -1);
bitmap_writer_build(&to_pack);
bitmap_writer_finish(written_list, nr_written,
tmpname.buf, write_bitmap_options);
write_bitmap_index = 0;
}
strbuf_release(&tmpname);
free(pack_tmp_name);
puts(oid_to_hex(&oid));
}
/* mark written objects as written to previous pack */
for (j = 0; j < nr_written; j++) {
written_list[j]->offset = (off_t)-1;
}
nr_remaining -= nr_written;
} while (nr_remaining && i < to_pack.nr_objects);
free(written_list);
free(write_order);
stop_progress(&progress_state);
if (written != nr_result)
die(_("wrote %"PRIu32" objects while expecting %"PRIu32),
written, nr_result);
trace2_data_intmax("pack-objects", the_repository,
"write_pack_file/wrote", nr_result);
}
static int no_try_delta(const char *path)
{
static struct attr_check *check;
if (!check)
check = attr_check_initl("delta", NULL);
git_check_attr(the_repository->index, path, check);
if (ATTR_FALSE(check->items[0].value))
return 1;
return 0;
}
/*
* When adding an object, check whether we have already added it
* to our packing list. If so, we can skip. However, if we are
* being asked to excludei t, but the previous mention was to include
* it, make sure to adjust its flags and tweak our numbers accordingly.
*
* As an optimization, we pass out the index position where we would have
* found the item, since that saves us from having to look it up again a
* few lines later when we want to add the new entry.
*/
static int have_duplicate_entry(const struct object_id *oid,
int exclude,
uint32_t *index_pos)
{
struct object_entry *entry;
entry = packlist_find(&to_pack, oid, index_pos);
if (!entry)
return 0;
if (exclude) {
if (!entry->preferred_base)
nr_result--;
entry->preferred_base = 1;
}
return 1;
}
static int want_found_object(int exclude, struct packed_git *p)
{
if (exclude)
return 1;
if (incremental)
return 0;
/*
* When asked to do --local (do not include an object that appears in a
* pack we borrow from elsewhere) or --honor-pack-keep (do not include
* an object that appears in a pack marked with .keep), finding a pack
* that matches the criteria is sufficient for us to decide to omit it.
* However, even if this pack does not satisfy the criteria, we need to
* make sure no copy of this object appears in _any_ pack that makes us
* to omit the object, so we need to check all the packs.
*
* We can however first check whether these options can possible matter;
* if they do not matter we know we want the object in generated pack.
* Otherwise, we signal "-1" at the end to tell the caller that we do
* not know either way, and it needs to check more packs.
*/
if (!ignore_packed_keep_on_disk &&
!ignore_packed_keep_in_core &&
(!local || !have_non_local_packs))
return 1;
if (local && !p->pack_local)
return 0;
if (p->pack_local &&
((ignore_packed_keep_on_disk && p->pack_keep) ||
(ignore_packed_keep_in_core && p->pack_keep_in_core)))
return 0;
/* we don't know yet; keep looking for more packs */
return -1;
}
/*
* Check whether we want the object in the pack (e.g., we do not want
* objects found in non-local stores if the "--local" option was used).
*
* If the caller already knows an existing pack it wants to take the object
* from, that is passed in *found_pack and *found_offset; otherwise this
* function finds if there is any pack that has the object and returns the pack
* and its offset in these variables.
*/
static int want_object_in_pack(const struct object_id *oid,
int exclude,
struct packed_git **found_pack,
off_t *found_offset)
{
int want;
struct list_head *pos;
struct multi_pack_index *m;
if (!exclude && local && has_loose_object_nonlocal(oid))
return 0;
/*
* If we already know the pack object lives in, start checks from that
* pack - in the usual case when neither --local was given nor .keep files
* are present we will determine the answer right now.
*/
if (*found_pack) {
want = want_found_object(exclude, *found_pack);
if (want != -1)
return want;
}
for (m = get_multi_pack_index(the_repository); m; m = m->next) {
struct pack_entry e;
if (fill_midx_entry(the_repository, oid, &e, m)) {
struct packed_git *p = e.p;
off_t offset;
if (p == *found_pack)
offset = *found_offset;
else
offset = find_pack_entry_one(oid->hash, p);
if (offset) {
if (!*found_pack) {
if (!is_pack_valid(p))
continue;
*found_offset = offset;
*found_pack = p;
}
want = want_found_object(exclude, p);
if (want != -1)
return want;
}
}
}
list_for_each(pos, get_packed_git_mru(the_repository)) {
struct packed_git *p = list_entry(pos, struct packed_git, mru);
off_t offset;
if (p == *found_pack)
offset = *found_offset;
else
offset = find_pack_entry_one(oid->hash, p);
if (offset) {
if (!*found_pack) {
if (!is_pack_valid(p))
continue;
*found_offset = offset;
*found_pack = p;
}
want = want_found_object(exclude, p);
if (!exclude && want > 0)
list_move(&p->mru,
get_packed_git_mru(the_repository));
if (want != -1)
return want;
}
}
return 1;
}
static void create_object_entry(const struct object_id *oid,
enum object_type type,
uint32_t hash,
int exclude,
int no_try_delta,
uint32_t index_pos,
struct packed_git *found_pack,
off_t found_offset)
{
struct object_entry *entry;
entry = packlist_alloc(&to_pack, oid->hash, index_pos);
entry->hash = hash;
oe_set_type(entry, type);
if (exclude)
entry->preferred_base = 1;
else
nr_result++;
if (found_pack) {
oe_set_in_pack(&to_pack, entry, found_pack);
entry->in_pack_offset = found_offset;
}
entry->no_try_delta = no_try_delta;
}
static const char no_closure_warning[] = N_(
"disabling bitmap writing, as some objects are not being packed"
);
static int add_object_entry(const struct object_id *oid, enum object_type type,
const char *name, int exclude)
{
struct packed_git *found_pack = NULL;
off_t found_offset = 0;
uint32_t index_pos;
display_progress(progress_state, ++nr_seen);
if (have_duplicate_entry(oid, exclude, &index_pos))
return 0;
if (!want_object_in_pack(oid, exclude, &found_pack, &found_offset)) {
/* The pack is missing an object, so it will not have closure */
if (write_bitmap_index) {
if (write_bitmap_index != WRITE_BITMAP_QUIET)
warning(_(no_closure_warning));
write_bitmap_index = 0;
}
return 0;
}
create_object_entry(oid, type, pack_name_hash(name),
exclude, name && no_try_delta(name),
index_pos, found_pack, found_offset);
return 1;
}
static int add_object_entry_from_bitmap(const struct object_id *oid,
enum object_type type,
int flags, uint32_t name_hash,
struct packed_git *pack, off_t offset)
{
uint32_t index_pos;
display_progress(progress_state, ++nr_seen);
if (have_duplicate_entry(oid, 0, &index_pos))
return 0;
if (!want_object_in_pack(oid, 0, &pack, &offset))
return 0;
create_object_entry(oid, type, name_hash, 0, 0, index_pos, pack, offset);
return 1;
}
struct pbase_tree_cache {
struct object_id oid;
int ref;
int temporary;
void *tree_data;
unsigned long tree_size;
};
static struct pbase_tree_cache *(pbase_tree_cache[256]);
static int pbase_tree_cache_ix(const struct object_id *oid)
{
return oid->hash[0] % ARRAY_SIZE(pbase_tree_cache);
}
static int pbase_tree_cache_ix_incr(int ix)
{
return (ix+1) % ARRAY_SIZE(pbase_tree_cache);
}
static struct pbase_tree {
struct pbase_tree *next;
/* This is a phony "cache" entry; we are not
* going to evict it or find it through _get()
* mechanism -- this is for the toplevel node that
* would almost always change with any commit.
*/
struct pbase_tree_cache pcache;
} *pbase_tree;
static struct pbase_tree_cache *pbase_tree_get(const struct object_id *oid)
{
struct pbase_tree_cache *ent, *nent;
void *data;
unsigned long size;
enum object_type type;
int neigh;
int my_ix = pbase_tree_cache_ix(oid);
int available_ix = -1;
/* pbase-tree-cache acts as a limited hashtable.
* your object will be found at your index or within a few
* slots after that slot if it is cached.
*/
for (neigh = 0; neigh < 8; neigh++) {
ent = pbase_tree_cache[my_ix];
if (ent && oideq(&ent->oid, oid)) {
ent->ref++;
return ent;
}
else if (((available_ix < 0) && (!ent || !ent->ref)) ||
((0 <= available_ix) &&
(!ent && pbase_tree_cache[available_ix])))
available_ix = my_ix;
if (!ent)
break;
my_ix = pbase_tree_cache_ix_incr(my_ix);
}
/* Did not find one. Either we got a bogus request or
* we need to read and perhaps cache.
*/
data = read_object_file(oid, &type, &size);
if (!data)
return NULL;
if (type != OBJ_TREE) {
free(data);
return NULL;
}
/* We need to either cache or return a throwaway copy */
if (available_ix < 0)
ent = NULL;
else {
ent = pbase_tree_cache[available_ix];
my_ix = available_ix;
}
if (!ent) {
nent = xmalloc(sizeof(*nent));
nent->temporary = (available_ix < 0);
}
else {
/* evict and reuse */
free(ent->tree_data);
nent = ent;
}
oidcpy(&nent->oid, oid);
nent->tree_data = data;
nent->tree_size = size;
nent->ref = 1;
if (!nent->temporary)
pbase_tree_cache[my_ix] = nent;
return nent;
}
static void pbase_tree_put(struct pbase_tree_cache *cache)
{
if (!cache->temporary) {
cache->ref--;
return;
}
free(cache->tree_data);
free(cache);
}
static int name_cmp_len(const char *name)
{
int i;
for (i = 0; name[i] && name[i] != '\n' && name[i] != '/'; i++)
;
return i;
}
static void add_pbase_object(struct tree_desc *tree,
const char *name,
int cmplen,
const char *fullname)
{
struct name_entry entry;
int cmp;
while (tree_entry(tree,&entry)) {
if (S_ISGITLINK(entry.mode))
continue;
cmp = tree_entry_len(&entry) != cmplen ? 1 :
memcmp(name, entry.path, cmplen);
if (cmp > 0)
continue;
if (cmp < 0)
return;
if (name[cmplen] != '/') {
add_object_entry(&entry.oid,
object_type(entry.mode),
fullname, 1);
return;
}
if (S_ISDIR(entry.mode)) {
struct tree_desc sub;
struct pbase_tree_cache *tree;
const char *down = name+cmplen+1;
int downlen = name_cmp_len(down);
tree = pbase_tree_get(&entry.oid);
if (!tree)
return;
init_tree_desc(&sub, tree->tree_data, tree->tree_size);
add_pbase_object(&sub, down, downlen, fullname);
pbase_tree_put(tree);
}
}
}
static unsigned *done_pbase_paths;
static int done_pbase_paths_num;
static int done_pbase_paths_alloc;
static int done_pbase_path_pos(unsigned hash)
{
int lo = 0;
int hi = done_pbase_paths_num;
while (lo < hi) {
int mi = lo + (hi - lo) / 2;
if (done_pbase_paths[mi] == hash)
return mi;
if (done_pbase_paths[mi] < hash)
hi = mi;
else
lo = mi + 1;
}
return -lo-1;
}
static int check_pbase_path(unsigned hash)
{
int pos = done_pbase_path_pos(hash);
if (0 <= pos)
return 1;
pos = -pos - 1;
ALLOC_GROW(done_pbase_paths,
done_pbase_paths_num + 1,
done_pbase_paths_alloc);
done_pbase_paths_num++;
if (pos < done_pbase_paths_num)
MOVE_ARRAY(done_pbase_paths + pos + 1, done_pbase_paths + pos,
done_pbase_paths_num - pos - 1);
done_pbase_paths[pos] = hash;
return 0;
}
static void add_preferred_base_object(const char *name)
{
struct pbase_tree *it;
int cmplen;
unsigned hash = pack_name_hash(name);
if (!num_preferred_base || check_pbase_path(hash))
return;
cmplen = name_cmp_len(name);
for (it = pbase_tree; it; it = it->next) {
if (cmplen == 0) {
add_object_entry(&it->pcache.oid, OBJ_TREE, NULL, 1);
}
else {
struct tree_desc tree;
init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size);
add_pbase_object(&tree, name, cmplen, name);
}
}
}
static void add_preferred_base(struct object_id *oid)
{
struct pbase_tree *it;
void *data;
unsigned long size;
struct object_id tree_oid;
if (window <= num_preferred_base++)
return;
data = read_object_with_reference(the_repository, oid,
tree_type, &size, &tree_oid);
if (!data)
return;
for (it = pbase_tree; it; it = it->next) {
if (oideq(&it->pcache.oid, &tree_oid)) {
free(data);
return;
}
}
it = xcalloc(1, sizeof(*it));
it->next = pbase_tree;
pbase_tree = it;
oidcpy(&it->pcache.oid, &tree_oid);
it->pcache.tree_data = data;
it->pcache.tree_size = size;
}
static void cleanup_preferred_base(void)
{
struct pbase_tree *it;
unsigned i;
it = pbase_tree;
pbase_tree = NULL;
while (it) {
struct pbase_tree *tmp = it;
it = tmp->next;
free(tmp->pcache.tree_data);
free(tmp);
}
for (i = 0; i < ARRAY_SIZE(pbase_tree_cache); i++) {
if (!pbase_tree_cache[i])
continue;
free(pbase_tree_cache[i]->tree_data);
FREE_AND_NULL(pbase_tree_cache[i]);
}
FREE_AND_NULL(done_pbase_paths);
done_pbase_paths_num = done_pbase_paths_alloc = 0;
}
/*
* Return 1 iff the object specified by "delta" can be sent
* literally as a delta against the base in "base_sha1". If
* so, then *base_out will point to the entry in our packing
* list, or NULL if we must use the external-base list.
*
* Depth value does not matter - find_deltas() will
* never consider reused delta as the base object to
* deltify other objects against, in order to avoid
* circular deltas.
*/
static int can_reuse_delta(const unsigned char *base_sha1,
struct object_entry *delta,
struct object_entry **base_out)
{
struct object_entry *base;
struct object_id base_oid;
if (!base_sha1)
return 0;
oidread(&base_oid, base_sha1);
/*
* First see if we're already sending the base (or it's explicitly in
* our "excluded" list).
*/
base = packlist_find(&to_pack, &base_oid, NULL);
if (base) {
if (!in_same_island(&delta->idx.oid, &base->idx.oid))
return 0;
*base_out = base;
return 1;
}
/*
* Otherwise, reachability bitmaps may tell us if the receiver has it,
* even if it was buried too deep in history to make it into the
* packing list.
*/
if (thin && bitmap_has_oid_in_uninteresting(bitmap_git, &base_oid)) {
if (use_delta_islands) {
if (!in_same_island(&delta->idx.oid, &base_oid))
return 0;
}
*base_out = NULL;
return 1;
}
return 0;
}
static void check_object(struct object_entry *entry)
{
unsigned long canonical_size;
if (IN_PACK(entry)) {
struct packed_git *p = IN_PACK(entry);
struct pack_window *w_curs = NULL;
const unsigned char *base_ref = NULL;
struct object_entry *base_entry;
unsigned long used, used_0;
unsigned long avail;
off_t ofs;
unsigned char *buf, c;
enum object_type type;
unsigned long in_pack_size;
buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
/*
* We want in_pack_type even if we do not reuse delta
* since non-delta representations could still be reused.
*/
used = unpack_object_header_buffer(buf, avail,
&type,
&in_pack_size);
if (used == 0)
goto give_up;
if (type < 0)
BUG("invalid type %d", type);
entry->in_pack_type = type;
/*
* Determine if this is a delta and if so whether we can
* reuse it or not. Otherwise let's find out as cheaply as
* possible what the actual type and size for this object is.
*/
switch (entry->in_pack_type) {
default:
/* Not a delta hence we've already got all we need. */
oe_set_type(entry, entry->in_pack_type);
SET_SIZE(entry, in_pack_size);
entry->in_pack_header_size = used;
if (oe_type(entry) < OBJ_COMMIT || oe_type(entry) > OBJ_BLOB)
goto give_up;
unuse_pack(&w_curs);
return;
case OBJ_REF_DELTA:
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 + the_hash_algo->rawsz;
break;
case OBJ_OFS_DELTA:
buf = use_pack(p, &w_curs,
entry->in_pack_offset + used, NULL);
used_0 = 0;
c = buf[used_0++];
ofs = c & 127;
while (c & 128) {
ofs += 1;
if (!ofs || MSB(ofs, 7)) {
error(_("delta base offset overflow in pack for %s"),
oid_to_hex(&entry->idx.oid));
goto give_up;
}
c = buf[used_0++];
ofs = (ofs << 7) + (c & 127);
}
ofs = entry->in_pack_offset - ofs;
if (ofs <= 0 || ofs >= entry->in_pack_offset) {
error(_("delta base offset out of bound for %s"),
oid_to_hex(&entry->idx.oid));
goto give_up;
}
if (reuse_delta && !entry->preferred_base) {
struct revindex_entry *revidx;
revidx = find_pack_revindex(p, ofs);
if (!revidx)
goto give_up;
base_ref = nth_packed_object_sha1(p, revidx->nr);
}
entry->in_pack_header_size = used + used_0;
break;
}
if (can_reuse_delta(base_ref, entry, &base_entry)) {
oe_set_type(entry, entry->in_pack_type);
SET_SIZE(entry, in_pack_size); /* delta size */
SET_DELTA_SIZE(entry, in_pack_size);
if (base_entry) {
SET_DELTA(entry, base_entry);
entry->delta_sibling_idx = base_entry->delta_child_idx;
SET_DELTA_CHILD(base_entry, entry);
} else {
SET_DELTA_EXT(entry, base_ref);
}
unuse_pack(&w_curs);
return;
}
if (oe_type(entry)) {
off_t delta_pos;
/*
* This must be a delta and we already know what the
* final object type is. Let's extract the actual
* object size from the delta header.
*/
delta_pos = entry->in_pack_offset + entry->in_pack_header_size;
canonical_size = get_size_from_delta(p, &w_curs, delta_pos);
if (canonical_size == 0)
goto give_up;
SET_SIZE(entry, canonical_size);
unuse_pack(&w_curs);
return;
}
/*
* No choice but to fall back to the recursive delta walk
* with oid_object_info() to find about the object type
* at this point...
*/
give_up:
unuse_pack(&w_curs);
}
oe_set_type(entry,
oid_object_info(the_repository, &entry->idx.oid, &canonical_size));
if (entry->type_valid) {
SET_SIZE(entry, canonical_size);
} else {
/*
* Bad object type is checked in prepare_pack(). This is
* to permit a missing preferred base object to be ignored
* as a preferred base. Doing so can result in a larger
* pack file, but the transfer will still take place.
*/
}
}
static int pack_offset_sort(const void *_a, const void *_b)
{
const struct object_entry *a = *(struct object_entry **)_a;
const struct object_entry *b = *(struct object_entry **)_b;
const struct packed_git *a_in_pack = IN_PACK(a);
const struct packed_git *b_in_pack = IN_PACK(b);
/* avoid filesystem trashing with loose objects */
if (!a_in_pack && !b_in_pack)
return oidcmp(&a->idx.oid, &b->idx.oid);
if (a_in_pack < b_in_pack)
return -1;
if (a_in_pack > b_in_pack)
return 1;
return a->in_pack_offset < b->in_pack_offset ? -1 :
(a->in_pack_offset > b->in_pack_offset);
}
/*
* Drop an on-disk delta we were planning to reuse. Naively, this would
* just involve blanking out the "delta" field, but we have to deal
* with some extra book-keeping:
*
* 1. Removing ourselves from the delta_sibling linked list.
*
* 2. Updating our size/type to the non-delta representation. These were
* either not recorded initially (size) or overwritten with the delta type
* (type) when check_object() decided to reuse the delta.
*
* 3. Resetting our delta depth, as we are now a base object.
*/
static void drop_reused_delta(struct object_entry *entry)
{
unsigned *idx = &to_pack.objects[entry->delta_idx - 1].delta_child_idx;
struct object_info oi = OBJECT_INFO_INIT;
enum object_type type;
unsigned long size;
while (*idx) {
struct object_entry *oe = &to_pack.objects[*idx - 1];
if (oe == entry)
*idx = oe->delta_sibling_idx;
else
idx = &oe->delta_sibling_idx;
}
SET_DELTA(entry, NULL);
entry->depth = 0;
oi.sizep = &size;
oi.typep = &type;
if (packed_object_info(the_repository, IN_PACK(entry), entry->in_pack_offset, &oi) < 0) {
/*
* We failed to get the info from this pack for some reason;
* fall back to oid_object_info, which may find another copy.
* And if that fails, the error will be recorded in oe_type(entry)
* and dealt with in prepare_pack().
*/
oe_set_type(entry,
oid_object_info(the_repository, &entry->idx.oid, &size));
} else {
oe_set_type(entry, type);
}
SET_SIZE(entry, size);
}
/*
* Follow the chain of deltas from this entry onward, throwing away any links
* that cause us to hit a cycle (as determined by the DFS state flags in
* the entries).
*
* We also detect too-long reused chains that would violate our --depth
* limit.
*/
static void break_delta_chains(struct object_entry *entry)
{
/*
* The actual depth of each object we will write is stored as an int,
* as it cannot exceed our int "depth" limit. But before we break
* changes based no that limit, we may potentially go as deep as the
* number of objects, which is elsewhere bounded to a uint32_t.
*/
uint32_t total_depth;
struct object_entry *cur, *next;
for (cur = entry, total_depth = 0;
cur;
cur = DELTA(cur), total_depth++) {
if (cur->dfs_state == DFS_DONE) {
/*
* We've already seen this object and know it isn't
* part of a cycle. We do need to append its depth
* to our count.
*/
total_depth += cur->depth;
break;
}
/*
* We break cycles before looping, so an ACTIVE state (or any
* other cruft which made its way into the state variable)
* is a bug.
*/
if (cur->dfs_state != DFS_NONE)
BUG("confusing delta dfs state in first pass: %d",
cur->dfs_state);
/*
* Now we know this is the first time we've seen the object. If
* it's not a delta, we're done traversing, but we'll mark it
* done to save time on future traversals.
*/
if (!DELTA(cur)) {
cur->dfs_state = DFS_DONE;
break;
}
/*
* Mark ourselves as active and see if the next step causes
* us to cycle to another active object. It's important to do
* this _before_ we loop, because it impacts where we make the
* cut, and thus how our total_depth counter works.
* E.g., We may see a partial loop like:
*
* A -> B -> C -> D -> B
*
* Cutting B->C breaks the cycle. But now the depth of A is
* only 1, and our total_depth counter is at 3. The size of the
* error is always one less than the size of the cycle we
* broke. Commits C and D were "lost" from A's chain.
*
* If we instead cut D->B, then the depth of A is correct at 3.
* We keep all commits in the chain that we examined.
*/
cur->dfs_state = DFS_ACTIVE;
if (DELTA(cur)->dfs_state == DFS_ACTIVE) {
drop_reused_delta(cur);
cur->dfs_state = DFS_DONE;
break;
}
}
/*
* And now that we've gone all the way to the bottom of the chain, we
* need to clear the active flags and set the depth fields as
* appropriate. Unlike the loop above, which can quit when it drops a
* delta, we need to keep going to look for more depth cuts. So we need
* an extra "next" pointer to keep going after we reset cur->delta.
*/
for (cur = entry; cur; cur = next) {
next = DELTA(cur);
/*
* We should have a chain of zero or more ACTIVE states down to
* a final DONE. We can quit after the DONE, because either it
* has no bases, or we've already handled them in a previous
* call.
*/
if (cur->dfs_state == DFS_DONE)
break;
else if (cur->dfs_state != DFS_ACTIVE)
BUG("confusing delta dfs state in second pass: %d",
cur->dfs_state);
/*
* If the total_depth is more than depth, then we need to snip
* the chain into two or more smaller chains that don't exceed
* the maximum depth. Most of the resulting chains will contain
* (depth + 1) entries (i.e., depth deltas plus one base), and
* the last chain (i.e., the one containing entry) will contain
* whatever entries are left over, namely
* (total_depth % (depth + 1)) of them.
*
* Since we are iterating towards decreasing depth, we need to
* decrement total_depth as we go, and we need to write to the
* entry what its final depth will be after all of the
* snipping. Since we're snipping into chains of length (depth
* + 1) entries, the final depth of an entry will be its
* original depth modulo (depth + 1). Any time we encounter an
* entry whose final depth is supposed to be zero, we snip it
* from its delta base, thereby making it so.
*/
cur->depth = (total_depth--) % (depth + 1);
if (!cur->depth)
drop_reused_delta(cur);
cur->dfs_state = DFS_DONE;
}
}
static void get_object_details(void)
{
uint32_t i;
struct object_entry **sorted_by_offset;
if (progress)
progress_state = start_progress(_("Counting objects"),
to_pack.nr_objects);
sorted_by_offset = xcalloc(to_pack.nr_objects, sizeof(struct object_entry *));
for (i = 0; i < to_pack.nr_objects; i++)
sorted_by_offset[i] = to_pack.objects + i;
QSORT(sorted_by_offset, to_pack.nr_objects, pack_offset_sort);
for (i = 0; i < to_pack.nr_objects; i++) {
struct object_entry *entry = sorted_by_offset[i];
check_object(entry);
if (entry->type_valid &&
oe_size_greater_than(&to_pack, entry, big_file_threshold))
entry->no_try_delta = 1;
display_progress(progress_state, i + 1);
}
stop_progress(&progress_state);
/*
* This must happen in a second pass, since we rely on the delta
* information for the whole list being completed.
*/
for (i = 0; i < to_pack.nr_objects; i++)
break_delta_chains(&to_pack.objects[i]);
free(sorted_by_offset);
}
/*
* We search for deltas in a list sorted by type, by filename hash, and then
* by size, so that we see progressively smaller and smaller files.
* That's because we prefer deltas to be from the bigger file
* to the smaller -- deletes are potentially cheaper, but perhaps
* more importantly, the bigger file is likely the more recent
* one. The deepest deltas are therefore the oldest objects which are
* less susceptible to be accessed often.
*/
static int type_size_sort(const void *_a, const void *_b)
{
const struct object_entry *a = *(struct object_entry **)_a;
const struct object_entry *b = *(struct object_entry **)_b;
const enum object_type a_type = oe_type(a);
const enum object_type b_type = oe_type(b);
const unsigned long a_size = SIZE(a);
const unsigned long b_size = SIZE(b);
if (a_type > b_type)
return -1;
if (a_type < b_type)
return 1;
if (a->hash > b->hash)
return -1;
if (a->hash < b->hash)
return 1;
if (a->preferred_base > b->preferred_base)
return -1;
if (a->preferred_base < b->preferred_base)
return 1;
if (use_delta_islands) {
const int island_cmp = island_delta_cmp(&a->idx.oid, &b->idx.oid);
if (island_cmp)
return island_cmp;
}
if (a_size > b_size)
return -1;
if (a_size < b_size)
return 1;
return a < b ? -1 : (a > b); /* newest first */
}
struct unpacked {
struct object_entry *entry;
void *data;
struct delta_index *index;
unsigned depth;
};
static int delta_cacheable(unsigned long src_size, unsigned long trg_size,
unsigned long delta_size)
{
if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
return 0;
if (delta_size < cache_max_small_delta_size)
return 1;
/* cache delta, if objects are large enough compared to delta size */
if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
return 1;
return 0;
}
/* Protect delta_cache_size */
static pthread_mutex_t cache_mutex;
#define cache_lock() pthread_mutex_lock(&cache_mutex)
#define cache_unlock() pthread_mutex_unlock(&cache_mutex)
/*
* Protect object list partitioning (e.g. struct thread_param) and
* progress_state
*/
static pthread_mutex_t progress_mutex;
#define progress_lock() pthread_mutex_lock(&progress_mutex)
#define progress_unlock() pthread_mutex_unlock(&progress_mutex)
/*
* Access to struct object_entry is unprotected since each thread owns
* a portion of the main object list. Just don't access object entries
* ahead in the list because they can be stolen and would need
* progress_mutex for protection.
*/
/*
* Return the size of the object without doing any delta
* reconstruction (so non-deltas are true object sizes, but deltas
* return the size of the delta data).
*/
unsigned long oe_get_size_slow(struct packing_data *pack,
const struct object_entry *e)
{
struct packed_git *p;
struct pack_window *w_curs;
unsigned char *buf;
enum object_type type;
unsigned long used, avail, size;
if (e->type_ != OBJ_OFS_DELTA && e->type_ != OBJ_REF_DELTA) {
packing_data_lock(&to_pack);
if (oid_object_info(the_repository, &e->idx.oid, &size) < 0)
die(_("unable to get size of %s"),
oid_to_hex(&e->idx.oid));
packing_data_unlock(&to_pack);
return size;
}
p = oe_in_pack(pack, e);
if (!p)
BUG("when e->type is a delta, it must belong to a pack");
packing_data_lock(&to_pack);
w_curs = NULL;
buf = use_pack(p, &w_curs, e->in_pack_offset, &avail);
used = unpack_object_header_buffer(buf, avail, &type, &size);
if (used == 0)
die(_("unable to parse object header of %s"),
oid_to_hex(&e->idx.oid));
unuse_pack(&w_curs);
packing_data_unlock(&to_pack);
return size;
}
static int try_delta(struct unpacked *trg, struct unpacked *src,
unsigned max_depth, unsigned long *mem_usage)
{
struct object_entry *trg_entry = trg->entry;
struct object_entry *src_entry = src->entry;
unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
unsigned ref_depth;
enum object_type type;
void *delta_buf;
/* Don't bother doing diffs between different types */
if (oe_type(trg_entry) != oe_type(src_entry))
return -1;
/*
* We do not bother to try a delta that we discarded on an
* earlier try, but only when reusing delta data. Note that
* src_entry that is marked as the preferred_base should always
* be considered, as even if we produce a suboptimal delta against
* it, we will still save the transfer cost, as we already know
* the other side has it and we won't send src_entry at all.
*/
if (reuse_delta && IN_PACK(trg_entry) &&
IN_PACK(trg_entry) == IN_PACK(src_entry) &&
!src_entry->preferred_base &&
trg_entry->in_pack_type != OBJ_REF_DELTA &&
trg_entry->in_pack_type != OBJ_OFS_DELTA)
return 0;
/* Let's not bust the allowed depth. */
if (src->depth >= max_depth)
return 0;
/* Now some size filtering heuristics. */
trg_size = SIZE(trg_entry);
if (!DELTA(trg_entry)) {
max_size = trg_size/2 - the_hash_algo->rawsz;
ref_depth = 1;
} else {
max_size = DELTA_SIZE(trg_entry);
ref_depth = trg->depth;
}
max_size = (uint64_t)max_size * (max_depth - src->depth) /
(max_depth - ref_depth + 1);
if (max_size == 0)
return 0;
src_size = SIZE(src_entry);
sizediff = src_size < trg_size ? trg_size - src_size : 0;
if (sizediff >= max_size)
return 0;
if (trg_size < src_size / 32)
return 0;
if (!in_same_island(&trg->entry->idx.oid, &src->entry->idx.oid))
return 0;
/* Load data if not already done */
if (!trg->data) {
packing_data_lock(&to_pack);
trg->data = read_object_file(&trg_entry->idx.oid, &type, &sz);
packing_data_unlock(&to_pack);
if (!trg->data)
die(_("object %s cannot be read"),
oid_to_hex(&trg_entry->idx.oid));
if (sz != trg_size)
die(_("object %s inconsistent object length (%"PRIuMAX" vs %"PRIuMAX")"),
oid_to_hex(&trg_entry->idx.oid), (uintmax_t)sz,
(uintmax_t)trg_size);
*mem_usage += sz;
}
if (!src->data) {
packing_data_lock(&to_pack);
src->data = read_object_file(&src_entry->idx.oid, &type, &sz);
packing_data_unlock(&to_pack);
if (!src->data) {
if (src_entry->preferred_base) {
static int warned = 0;
if (!warned++)
warning(_("object %s cannot be read"),
oid_to_hex(&src_entry->idx.oid));
/*
* Those objects are not included in the
* resulting pack. Be resilient and ignore
* them if they can't be read, in case the
* pack could be created nevertheless.
*/
return 0;
}
die(_("object %s cannot be read"),
oid_to_hex(&src_entry->idx.oid));
}
if (sz != src_size)
die(_("object %s inconsistent object length (%"PRIuMAX" vs %"PRIuMAX")"),
oid_to_hex(&src_entry->idx.oid), (uintmax_t)sz,
(uintmax_t)src_size);
*mem_usage += sz;
}
if (!src->index) {
src->index = create_delta_index(src->data, src_size);
if (!src->index) {
static int warned = 0;
if (!warned++)
warning(_("suboptimal pack - out of memory"));
return 0;
}
*mem_usage += sizeof_delta_index(src->index);
}
delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
if (!delta_buf)
return 0;
if (DELTA(trg_entry)) {
/* Prefer only shallower same-sized deltas. */
if (delta_size == DELTA_SIZE(trg_entry) &&
src->depth + 1 >= trg->depth) {
free(delta_buf);
return 0;
}
}
/*
* Handle memory allocation outside of the cache
* accounting lock. Compiler will optimize the strangeness
* away when NO_PTHREADS is defined.
*/
free(trg_entry->delta_data);
cache_lock();
if (trg_entry->delta_data) {
delta_cache_size -= DELTA_SIZE(trg_entry);
trg_entry->delta_data = NULL;
}
if (delta_cacheable(src_size, trg_size, delta_size)) {
delta_cache_size += delta_size;
cache_unlock();
trg_entry->delta_data = xrealloc(delta_buf, delta_size);
} else {
cache_unlock();
free(delta_buf);
}
SET_DELTA(trg_entry, src_entry);
SET_DELTA_SIZE(trg_entry, delta_size);
trg->depth = src->depth + 1;
return 1;
}
static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
{
struct object_entry *child = DELTA_CHILD(me);
unsigned int m = n;
while (child) {
const unsigned int c = check_delta_limit(child, n + 1);
if (m < c)
m = c;
child = DELTA_SIBLING(child);
}
return m;
}
static unsigned long free_unpacked(struct unpacked *n)
{
unsigned long freed_mem = sizeof_delta_index(n->index);
free_delta_index(n->index);
n->index = NULL;
if (n->data) {
freed_mem += SIZE(n->entry);
FREE_AND_NULL(n->data);
}
n->entry = NULL;
n->depth = 0;
return freed_mem;
}
static void find_deltas(struct object_entry **list, unsigned *list_size,
int window, int depth, unsigned *processed)
{
uint32_t i, idx = 0, count = 0;
struct unpacked *array;
unsigned long mem_usage = 0;
array = xcalloc(window, sizeof(struct unpacked));
for (;;) {
struct object_entry *entry;
struct unpacked *n = array + idx;
int j, max_depth, best_base = -1;
progress_lock();
if (!*list_size) {
progress_unlock();
break;
}
entry = *list++;
(*list_size)--;
if (!entry->preferred_base) {
(*processed)++;
display_progress(progress_state, *processed);
}
progress_unlock();
mem_usage -= free_unpacked(n);
n->entry = entry;
while (window_memory_limit &&
mem_usage > window_memory_limit &&
count > 1) {
const uint32_t tail = (idx + window - count) % window;
mem_usage -= free_unpacked(array + tail);
count--;
}
/* We do not compute delta to *create* objects we are not
* going to pack.
*/
if (entry->preferred_base)
goto next;
/*
* If the current object is at pack edge, take the depth the
* objects that depend on the current object into account
* otherwise they would become too deep.
*/
max_depth = depth;
if (DELTA_CHILD(entry)) {
max_depth -= check_delta_limit(entry, 0);
if (max_depth <= 0)
goto next;
}
j = window;
while (--j > 0) {
int ret;
uint32_t other_idx = idx + j;
struct unpacked *m;
if (other_idx >= window)
other_idx -= window;
m = array + other_idx;
if (!m->entry)
break;
ret = try_delta(n, m, max_depth, &mem_usage);
if (ret < 0)
break;
else if (ret > 0)
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) {
unsigned long size;
size = do_compress(&entry->delta_data, DELTA_SIZE(entry));
if (size < (1U << OE_Z_DELTA_BITS)) {
entry->z_delta_size = size;
cache_lock();
delta_cache_size -= DELTA_SIZE(entry);
delta_cache_size += entry->z_delta_size;
cache_unlock();
} else {
FREE_AND_NULL(entry->delta_data);
entry->z_delta_size = 0;
}
}
/* 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 (DELTA(entry) && max_depth <= n->depth)
continue;
/*
* Move the best delta base up in the window, after the
* currently deltified object, to keep it longer. It will
* be the first base object to be attempted next.
*/
if (DELTA(entry)) {
struct unpacked swap = array[best_base];
int dist = (window + idx - best_base) % window;
int dst = best_base;
while (dist--) {
int src = (dst + 1) % window;
array[dst] = array[src];
dst = src;
}
array[dst] = swap;
}
next:
idx++;
if (count + 1 < window)
count++;
if (idx >= window)
idx = 0;
}
for (i = 0; i < window; ++i) {
free_delta_index(array[i].index);
free(array[i].data);
}
free(array);
}
static void try_to_free_from_threads(size_t size)
{
packing_data_lock(&to_pack);
release_pack_memory(size);
packing_data_unlock(&to_pack);
}
static try_to_free_t old_try_to_free_routine;
/*
* The main object list is split into smaller lists, each is handed to
* one worker.
*
* The main thread waits on the condition that (at least) one of the workers
* has stopped working (which is indicated in the .working member of
* struct thread_params).
*
* When a work thread has completed its work, it sets .working to 0 and
* signals the main thread and waits on the condition that .data_ready
* becomes 1.
*
* The main thread steals half of the work from the worker that has
* most work left to hand it to the idle worker.
*/
struct thread_params {
pthread_t thread;
struct object_entry **list;
unsigned list_size;
unsigned remaining;
int window;
int depth;
int working;
int data_ready;
pthread_mutex_t mutex;
pthread_cond_t cond;
unsigned *processed;
};
static pthread_cond_t progress_cond;
/*
* Mutex and conditional variable can't be statically-initialized on Windows.
*/
static void init_threaded_search(void)
{
pthread_mutex_init(&cache_mutex, NULL);
pthread_mutex_init(&progress_mutex, NULL);
pthread_cond_init(&progress_cond, NULL);
old_try_to_free_routine = set_try_to_free_routine(try_to_free_from_threads);
}
static void cleanup_threaded_search(void)
{
set_try_to_free_routine(old_try_to_free_routine);
pthread_cond_destroy(&progress_cond);
pthread_mutex_destroy(&cache_mutex);
pthread_mutex_destroy(&progress_mutex);
}
static void *threaded_find_deltas(void *arg)
{
struct thread_params *me = arg;
progress_lock();
while (me->remaining) {
progress_unlock();
find_deltas(me->list, &me->remaining,
me->window, me->depth, me->processed);
progress_lock();
me->working = 0;
pthread_cond_signal(&progress_cond);
progress_unlock();
/*
* We must not set ->data_ready before we wait on the
* condition because the main thread may have set it to 1
* before we get here. In order to be sure that new
* work is available if we see 1 in ->data_ready, it
* was initialized to 0 before this thread was spawned
* and we reset it to 0 right away.
*/
pthread_mutex_lock(&me->mutex);
while (!me->data_ready)
pthread_cond_wait(&me->cond, &me->mutex);
me->data_ready = 0;
pthread_mutex_unlock(&me->mutex);
progress_lock();
}
progress_unlock();
/* leave ->working 1 so that this doesn't get more work assigned */
return NULL;
}
static void ll_find_deltas(struct object_entry **list, unsigned list_size,
int window, int depth, unsigned *processed)
{
struct thread_params *p;
int i, ret, active_threads = 0;
init_threaded_search();
if (delta_search_threads <= 1) {
find_deltas(list, &list_size, window, depth, processed);
cleanup_threaded_search();
return;
}
if (progress > pack_to_stdout)
fprintf_ln(stderr, _("Delta compression using up to %d threads"),
delta_search_threads);
p = xcalloc(delta_search_threads, sizeof(*p));
/* Partition the work amongst work threads. */
for (i = 0; i < delta_search_threads; i++) {
unsigned sub_size = list_size / (delta_search_threads - i);
/* don't use too small segments or no deltas will be found */
if (sub_size < 2*window && i+1 < delta_search_threads)
sub_size = 0;
p[i].window = window;
p[i].depth = depth;
p[i].processed = processed;
p[i].working = 1;
p[i].data_ready = 0;
/* try to split chunks on "path" boundaries */
while (sub_size && sub_size < list_size &&
list[sub_size]->hash &&
list[sub_size]->hash == list[sub_size-1]->hash)
sub_size++;
p[i].list = list;
p[i].list_size = sub_size;
p[i].remaining = sub_size;
list += sub_size;
list_size -= sub_size;
}
/* Start work threads. */
for (i = 0; i < delta_search_threads; i++) {
if (!p[i].list_size)
continue;
pthread_mutex_init(&p[i].mutex, NULL);
pthread_cond_init(&p[i].cond, NULL);
ret = pthread_create(&p[i].thread, NULL,
threaded_find_deltas, &p[i]);
if (ret)
die(_("unable to create thread: %s"), strerror(ret));
active_threads++;
}
/*
* Now let's wait for work completion. Each time a thread is done
* with its work, we steal half of the remaining work from the
* thread with the largest number of unprocessed objects and give
* it to that newly idle thread. This ensure good load balancing
* until the remaining object list segments are simply too short
* to be worth splitting anymore.
*/
while (active_threads) {
struct thread_params *target = NULL;
struct thread_params *victim = NULL;
unsigned sub_size = 0;
progress_lock();
for (;;) {
for (i = 0; !target && i < delta_search_threads; i++)
if (!p[i].working)
target = &p[i];
if (target)
break;
pthread_cond_wait(&progress_cond, &progress_mutex);
}
for (i = 0; i < delta_search_threads; i++)
if (p[i].remaining > 2*window &&
(!victim || victim->remaining < p[i].remaining))
victim = &p[i];
if (victim) {
sub_size = victim->remaining / 2;
list = victim->list + victim->list_size - sub_size;
while (sub_size && list[0]->hash &&
list[0]->hash == list[-1]->hash) {
list++;
sub_size--;
}
if (!sub_size) {
/*
* It is possible for some "paths" to have
* so many objects that no hash boundary
* might be found. Let's just steal the
* exact half in that case.
*/
sub_size = victim->remaining / 2;
list -= sub_size;
}
target->list = list;
victim->list_size -= sub_size;
victim->remaining -= sub_size;
}
target->list_size = sub_size;
target->remaining = sub_size;
target->working = 1;
progress_unlock();
pthread_mutex_lock(&target->mutex);
target->data_ready = 1;
pthread_cond_signal(&target->cond);
pthread_mutex_unlock(&target->mutex);
if (!sub_size) {
pthread_join(target->thread, NULL);
pthread_cond_destroy(&target->cond);
pthread_mutex_destroy(&target->mutex);
active_threads--;
}
}
cleanup_threaded_search();
free(p);
}
static void add_tag_chain(const struct object_id *oid)
{
struct tag *tag;
/*
* We catch duplicates already in add_object_entry(), but we'd
* prefer to do this extra check to avoid having to parse the
* tag at all if we already know that it's being packed (e.g., if
* it was included via bitmaps, we would not have parsed it
* previously).
*/
if (packlist_find(&to_pack, oid, NULL))
return;
tag = lookup_tag(the_repository, oid);
while (1) {
if (!tag || parse_tag(tag) || !tag->tagged)
die(_("unable to pack objects reachable from tag %s"),
oid_to_hex(oid));
add_object_entry(&tag->object.oid, OBJ_TAG, NULL, 0);
if (tag->tagged->type != OBJ_TAG)
return;
tag = (struct tag *)tag->tagged;
}
}
static int add_ref_tag(const char *path, const struct object_id *oid, int flag, void *cb_data)
{
struct object_id peeled;
if (starts_with(path, "refs/tags/") && /* is a tag? */
!peel_ref(path, &peeled) && /* peelable? */
packlist_find(&to_pack, &peeled, NULL)) /* object packed? */
add_tag_chain(oid);
return 0;
}
static void prepare_pack(int window, int depth)
{
struct object_entry **delta_list;
uint32_t i, nr_deltas;
unsigned n;
if (use_delta_islands)
resolve_tree_islands(the_repository, progress, &to_pack);
get_object_details();
/*
* If we're locally repacking then we need to be doubly careful
* from now on in order to make sure no stealth corruption gets
* propagated to the new pack. Clients receiving streamed packs
* should validate everything they get anyway so no need to incur
* the additional cost here in that case.
*/
if (!pack_to_stdout)
do_check_packed_object_crc = 1;
if (!to_pack.nr_objects || !window || !depth)
return;
ALLOC_ARRAY(delta_list, to_pack.nr_objects);
nr_deltas = n = 0;
for (i = 0; i < to_pack.nr_objects; i++) {
struct object_entry *entry = to_pack.objects + i;
if (DELTA(entry))
/* This happens if we decided to reuse existing
* delta from a pack. "reuse_delta &&" is implied.
*/
continue;
if (!entry->type_valid ||
oe_size_less_than(&to_pack, entry, 50))
continue;
if (entry->no_try_delta)
continue;
if (!entry->preferred_base) {
nr_deltas++;
if (oe_type(entry) < 0)
die(_("unable to get type of object %s"),
oid_to_hex(&entry->idx.oid));
} else {
if (oe_type(entry) < 0) {
/*
* This object is not found, but we
* don't have to include it anyway.
*/
continue;
}
}
delta_list[n++] = entry;
}
if (nr_deltas && n > 1) {
unsigned nr_done = 0;
if (progress)
progress_state = start_progress(_("Compressing objects"),
nr_deltas);
QSORT(delta_list, n, type_size_sort);
ll_find_deltas(delta_list, n, window+1, depth, &nr_done);
stop_progress(&progress_state);
if (nr_done != nr_deltas)
die(_("inconsistency with delta count"));
}
free(delta_list);
}
static int git_pack_config(const char *k, const char *v, void *cb)
{
if (!strcmp(k, "pack.window")) {
window = git_config_int(k, v);
return 0;
}
if (!strcmp(k, "pack.windowmemory")) {
window_memory_limit = git_config_ulong(k, v);
return 0;
}
if (!strcmp(k, "pack.depth")) {
depth = git_config_int(k, v);
return 0;
}
if (!strcmp(k, "pack.deltacachesize")) {
max_delta_cache_size = git_config_int(k, v);
return 0;
}
if (!strcmp(k, "pack.deltacachelimit")) {
cache_max_small_delta_size = git_config_int(k, v);
return 0;
}
if (!strcmp(k, "pack.writebitmaphashcache")) {
if (git_config_bool(k, v))
write_bitmap_options |= BITMAP_OPT_HASH_CACHE;
else
write_bitmap_options &= ~BITMAP_OPT_HASH_CACHE;
}
if (!strcmp(k, "pack.usebitmaps")) {
use_bitmap_index_default = git_config_bool(k, v);
return 0;
}
if (!strcmp(k, "pack.usesparse")) {
sparse = git_config_bool(k, v);
return 0;
}