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Copy pathbuiltin-pack-objects.c
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builtin-pack-objects.c
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#include "builtin.h"
#include "cache.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 "progress.h"
#include "refs.h"
#ifdef THREADED_DELTA_SEARCH
#include "thread-utils.h"
#include <pthread.h>
#endif
static const char pack_usage[] = "\
git pack-objects [{ -q | --progress | --all-progress }] \n\
[--max-pack-size=N] [--local] [--incremental] \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] \n\
[--keep-unreachable | --unpack-unreachable] \n\
[<ref-list | <object-list]";
struct object_entry {
struct pack_idx_entry idx;
unsigned long size; /* uncompressed size */
struct packed_git *in_pack; /* already in pack */
off_t in_pack_offset;
struct object_entry *delta; /* delta base object */
struct object_entry *delta_child; /* deltified objects who bases me */
struct object_entry *delta_sibling; /* other deltified objects who
* uses the same base as me
*/
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 */
unsigned char in_pack_header_size;
unsigned char preferred_base; /* we do not pack this, but is available
* to be used as the base object to delta
* objects against.
*/
unsigned char no_try_delta;
};
/*
* Objects we are going to pack are collected in objects array (dynamically
* expanded). nr_objects & nr_alloc controls this array. They are stored
* in the order we see -- typically rev-list --objects order that gives us
* nice "minimum seek" order.
*/
static struct object_entry *objects;
static struct pack_idx_entry **written_list;
static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
static int non_empty;
static int reuse_delta = 1, reuse_object = 1;
static int keep_unreachable, unpack_unreachable, include_tag;
static int local;
static int incremental;
static int ignore_packed_keep;
static int allow_ofs_delta;
static const char *base_name;
static int progress = 1;
static int window = 10;
static uint32_t pack_size_limit, pack_size_limit_cfg;
static int depth = 50;
static int delta_search_threads = 1;
static int pack_to_stdout;
static int num_preferred_base;
static struct progress *progress_state;
static int pack_compression_level = Z_DEFAULT_COMPRESSION;
static int pack_compression_seen;
static unsigned long delta_cache_size = 0;
static unsigned long max_delta_cache_size = 0;
static unsigned long cache_max_small_delta_size = 1000;
static unsigned long window_memory_limit = 0;
/*
* The object names in objects array are hashed with this hashtable,
* to help looking up the entry by object name.
* This hashtable is built after all the objects are seen.
*/
static int *object_ix;
static int object_ix_hashsz;
/*
* stats
*/
static uint32_t written, written_delta;
static uint32_t reused, reused_delta;
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_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(base_buf, base_size,
buf, size, &delta_size, 0);
if (!delta_buf || delta_size != entry->delta_size)
die("delta size changed");
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",
* and the high bit is "size continues".
* - each byte afterwards: low seven bits are size continuation,
* with the high bit being "size continues"
*/
static int encode_header(enum object_type type, unsigned long size, unsigned char *hdr)
{
int n = 1;
unsigned char c;
if (type < OBJ_COMMIT || type > OBJ_REF_DELTA)
die("bad type %d", type);
c = (type << 4) | (size & 15);
size >>= 4;
while (size) {
*hdr++ = c | 0x80;
c = size & 0x7f;
size >>= 7;
n++;
}
*hdr = c;
return n;
}
/*
* 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)
{
z_stream stream;
unsigned char fakebuf[4096], *in;
int st;
memset(&stream, 0, sizeof(stream));
inflateInit(&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 = inflate(&stream, Z_FINISH);
offset += stream.next_in - in;
} while (st == Z_OK || st == Z_BUF_ERROR);
inflateEnd(&stream);
return (st == Z_STREAM_END &&
stream.total_out == expect &&
stream.total_in == len) ? 0 : -1;
}
static void copy_pack_data(struct sha1file *f,
struct packed_git *p,
struct pack_window **w_curs,
off_t offset,
off_t len)
{
unsigned char *in;
unsigned int avail;
while (len) {
in = use_pack(p, w_curs, offset, &avail);
if (avail > len)
avail = (unsigned int)len;
sha1write(f, in, avail);
offset += avail;
len -= avail;
}
}
static unsigned long write_object(struct sha1file *f,
struct object_entry *entry,
off_t write_offset)
{
unsigned long size, limit, datalen;
void *buf;
unsigned char header[10], dheader[10];
unsigned hdrlen;
enum object_type type;
int usable_delta, to_reuse;
if (!pack_to_stdout)
crc32_begin(f);
type = entry->type;
/* write 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 (!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 (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 (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 */
else
to_reuse = 1; /* we have it in-pack undeltified,
* and we do not need to deltify it.
*/
if (!to_reuse) {
if (!usable_delta) {
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;
type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
} else {
buf = get_delta(entry);
size = entry->delta_size;
type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
}
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(type, size, header);
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 - entry->delta->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 + 20 >= limit) {
free(buf);
return 0;
}
sha1write(f, header, hdrlen);
sha1write(f, dheader + pos, sizeof(dheader) - pos);
hdrlen += sizeof(dheader) - pos;
} 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(buf);
return 0;
}
sha1write(f, header, hdrlen);
sha1write(f, entry->delta->idx.sha1, 20);
hdrlen += 20;
} else {
if (limit && hdrlen + datalen + 20 >= limit) {
free(buf);
return 0;
}
sha1write(f, header, hdrlen);
}
sha1write(f, buf, datalen);
free(buf);
}
else {
struct packed_git *p = entry->in_pack;
struct pack_window *w_curs = NULL;
struct revindex_entry *revidx;
off_t offset;
if (entry->delta) {
type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
reused_delta++;
}
hdrlen = encode_header(type, entry->size, header);
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))
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 (type == OBJ_OFS_DELTA) {
off_t ofs = entry->idx.offset - entry->delta->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 + 20 >= limit)
return 0;
sha1write(f, header, hdrlen);
sha1write(f, dheader + pos, sizeof(dheader) - pos);
hdrlen += sizeof(dheader) - pos;
} else if (type == OBJ_REF_DELTA) {
if (limit && hdrlen + 20 + datalen + 20 >= limit)
return 0;
sha1write(f, header, hdrlen);
sha1write(f, entry->delta->idx.sha1, 20);
hdrlen += 20;
} else {
if (limit && hdrlen + datalen + 20 >= limit)
return 0;
sha1write(f, header, hdrlen);
}
if (!pack_to_stdout && p->index_version == 1 &&
check_pack_inflate(p, &w_curs, offset, datalen, entry->size))
die("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
copy_pack_data(f, p, &w_curs, offset, datalen);
unuse_pack(&w_curs);
reused++;
}
if (usable_delta)
written_delta++;
written++;
if (!pack_to_stdout)
entry->idx.crc32 = crc32_end(f);
return hdrlen + datalen;
}
static int write_one(struct sha1file *f,
struct object_entry *e,
off_t *offset)
{
unsigned long size;
/* offset is non zero if object is written already. */
if (e->idx.offset || e->preferred_base)
return 1;
/* if we are deltified, write out base object first. */
if (e->delta && !write_one(f, e->delta, offset))
return 0;
e->idx.offset = *offset;
size = write_object(f, e, *offset);
if (!size) {
e->idx.offset = 0;
return 0;
}
written_list[nr_written++] = &e->idx;
/* make sure off_t is sufficiently large not to wrap */
if (*offset > *offset + size)
die("pack too large for current definition of off_t");
*offset += size;
return 1;
}
/* forward declaration for write_pack_file */
static int adjust_perm(const char *path, mode_t mode);
static void write_pack_file(void)
{
uint32_t i = 0, j;
struct sha1file *f;
off_t offset;
struct pack_header hdr;
uint32_t nr_remaining = nr_result;
time_t last_mtime = 0;
if (progress > pack_to_stdout)
progress_state = start_progress("Writing objects", nr_result);
written_list = xmalloc(nr_objects * sizeof(*written_list));
do {
unsigned char sha1[20];
char *pack_tmp_name = NULL;
if (pack_to_stdout) {
f = sha1fd_throughput(1, "<stdout>", progress_state);
} else {
char tmpname[PATH_MAX];
int fd;
snprintf(tmpname, sizeof(tmpname),
"%s/pack/tmp_pack_XXXXXX", get_object_directory());
fd = xmkstemp(tmpname);
pack_tmp_name = xstrdup(tmpname);
f = sha1fd(fd, pack_tmp_name);
}
hdr.hdr_signature = htonl(PACK_SIGNATURE);
hdr.hdr_version = htonl(PACK_VERSION);
hdr.hdr_entries = htonl(nr_remaining);
sha1write(f, &hdr, sizeof(hdr));
offset = sizeof(hdr);
nr_written = 0;
for (; i < nr_objects; i++) {
if (!write_one(f, objects + i, &offset))
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) {
sha1close(f, sha1, CSUM_CLOSE);
} else if (nr_written == nr_remaining) {
sha1close(f, sha1, CSUM_FSYNC);
} else {
int fd = sha1close(f, sha1, 0);
fixup_pack_header_footer(fd, sha1, pack_tmp_name,
nr_written, sha1, offset);
close(fd);
}
if (!pack_to_stdout) {
mode_t mode = umask(0);
struct stat st;
char *idx_tmp_name, tmpname[PATH_MAX];
umask(mode);
mode = 0444 & ~mode;
idx_tmp_name = write_idx_file(NULL, written_list,
nr_written, sha1);
snprintf(tmpname, sizeof(tmpname), "%s-%s.pack",
base_name, sha1_to_hex(sha1));
free_pack_by_name(tmpname);
if (adjust_perm(pack_tmp_name, mode))
die("unable to make temporary pack file readable: %s",
strerror(errno));
if (rename(pack_tmp_name, tmpname))
die("unable to rename temporary pack file: %s",
strerror(errno));
/*
* 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(tmpname, &st) < 0) {
warning("failed to stat %s: %s",
tmpname, strerror(errno));
} else if (!last_mtime) {
last_mtime = st.st_mtime;
} else {
struct utimbuf utb;
utb.actime = st.st_atime;
utb.modtime = --last_mtime;
if (utime(tmpname, &utb) < 0)
warning("failed utime() on %s: %s",
tmpname, strerror(errno));
}
snprintf(tmpname, sizeof(tmpname), "%s-%s.idx",
base_name, sha1_to_hex(sha1));
if (adjust_perm(idx_tmp_name, mode))
die("unable to make temporary index file readable: %s",
strerror(errno));
if (rename(idx_tmp_name, tmpname))
die("unable to rename temporary index file: %s",
strerror(errno));
free(idx_tmp_name);
free(pack_tmp_name);
puts(sha1_to_hex(sha1));
}
/* 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 < nr_objects);
free(written_list);
stop_progress(&progress_state);
if (written != nr_result)
die("wrote %"PRIu32" objects while expecting %"PRIu32,
written, nr_result);
/*
* We have scanned through [0 ... i). Since we have written
* the correct number of objects, the remaining [i ... nr_objects)
* items must be either already written (due to out-of-order delta base)
* or a preferred base. Count those which are neither and complain if any.
*/
for (j = 0; i < nr_objects; i++) {
struct object_entry *e = objects + i;
j += !e->idx.offset && !e->preferred_base;
}
if (j)
die("wrote %"PRIu32" objects as expected but %"PRIu32
" unwritten", written, j);
}
static int locate_object_entry_hash(const unsigned char *sha1)
{
int i;
unsigned int ui;
memcpy(&ui, sha1, sizeof(unsigned int));
i = ui % object_ix_hashsz;
while (0 < object_ix[i]) {
if (!hashcmp(sha1, objects[object_ix[i] - 1].idx.sha1))
return i;
if (++i == object_ix_hashsz)
i = 0;
}
return -1 - i;
}
static struct object_entry *locate_object_entry(const unsigned char *sha1)
{
int i;
if (!object_ix_hashsz)
return NULL;
i = locate_object_entry_hash(sha1);
if (0 <= i)
return &objects[object_ix[i]-1];
return NULL;
}
static void rehash_objects(void)
{
uint32_t i;
struct object_entry *oe;
object_ix_hashsz = nr_objects * 3;
if (object_ix_hashsz < 1024)
object_ix_hashsz = 1024;
object_ix = xrealloc(object_ix, sizeof(int) * object_ix_hashsz);
memset(object_ix, 0, sizeof(int) * object_ix_hashsz);
for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
int ix = locate_object_entry_hash(oe->idx.sha1);
if (0 <= ix)
continue;
ix = -1 - ix;
object_ix[ix] = i + 1;
}
}
static unsigned name_hash(const char *name)
{
unsigned char c;
unsigned hash = 0;
if (!name)
return 0;
/*
* This effectively just creates a sortable number from the
* last sixteen non-whitespace characters. Last characters
* count "most", so things that end in ".c" sort together.
*/
while ((c = *name++) != 0) {
if (isspace(c))
continue;
hash = (hash >> 2) + (c << 24);
}
return hash;
}
static void setup_delta_attr_check(struct git_attr_check *check)
{
static struct git_attr *attr_delta;
if (!attr_delta)
attr_delta = git_attr("delta", 5);
check[0].attr = attr_delta;
}
static int no_try_delta(const char *path)
{
struct git_attr_check check[1];
setup_delta_attr_check(check);
if (git_checkattr(path, ARRAY_SIZE(check), check))
return 0;
if (ATTR_FALSE(check->value))
return 1;
return 0;
}
static int add_object_entry(const unsigned char *sha1, enum object_type type,
const char *name, int exclude)
{
struct object_entry *entry;
struct packed_git *p, *found_pack = NULL;
off_t found_offset = 0;
int ix;
unsigned hash = name_hash(name);
ix = nr_objects ? locate_object_entry_hash(sha1) : -1;
if (ix >= 0) {
if (exclude) {
entry = objects + object_ix[ix] - 1;
if (!entry->preferred_base)
nr_result--;
entry->preferred_base = 1;
}
return 0;
}
if (!exclude && local && has_loose_object_nonlocal(sha1))
return 0;
for (p = packed_git; p; p = p->next) {
off_t offset = find_pack_entry_one(sha1, p);
if (offset) {
if (!found_pack) {
found_offset = offset;
found_pack = p;
}
if (exclude)
break;
if (incremental)
return 0;
if (local && !p->pack_local)
return 0;
if (ignore_packed_keep && p->pack_local && p->pack_keep)
return 0;
}
}
if (nr_objects >= nr_alloc) {
nr_alloc = (nr_alloc + 1024) * 3 / 2;
objects = xrealloc(objects, nr_alloc * sizeof(*entry));
}
entry = objects + nr_objects++;
memset(entry, 0, sizeof(*entry));
hashcpy(entry->idx.sha1, sha1);
entry->hash = hash;
if (type)
entry->type = type;
if (exclude)
entry->preferred_base = 1;
else
nr_result++;
if (found_pack) {
entry->in_pack = found_pack;
entry->in_pack_offset = found_offset;
}
if (object_ix_hashsz * 3 <= nr_objects * 4)
rehash_objects();
else
object_ix[-1 - ix] = nr_objects;
display_progress(progress_state, nr_objects);
if (name && no_try_delta(name))
entry->no_try_delta = 1;
return 1;
}
struct pbase_tree_cache {
unsigned char sha1[20];
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 unsigned char *sha1)
{
return sha1[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 nor 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 unsigned char *sha1)
{
struct pbase_tree_cache *ent, *nent;
void *data;
unsigned long size;
enum object_type type;
int neigh;
int my_ix = pbase_tree_cache_ix(sha1);
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 && !hashcmp(ent->sha1, sha1)) {
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_sha1_file(sha1, &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;
}
hashcpy(nent->sha1, sha1);
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.path, entry.sha1) != cmplen ? 1 :
memcmp(name, entry.path, cmplen);
if (cmp > 0)
continue;
if (cmp < 0)
return;
if (name[cmplen] != '/') {
add_object_entry(entry.sha1,
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.sha1);
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 = (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_paths) ? -1 : done_pbase_path_pos(hash);
if (0 <= pos)
return 1;
pos = -pos - 1;
if (done_pbase_paths_alloc <= done_pbase_paths_num) {
done_pbase_paths_alloc = alloc_nr(done_pbase_paths_alloc);
done_pbase_paths = xrealloc(done_pbase_paths,
done_pbase_paths_alloc *
sizeof(unsigned));
}
done_pbase_paths_num++;
if (pos < done_pbase_paths_num)
memmove(done_pbase_paths + pos + 1,
done_pbase_paths + pos,
(done_pbase_paths_num - pos - 1) * sizeof(unsigned));
done_pbase_paths[pos] = hash;
return 0;
}
static void add_preferred_base_object(const char *name)
{
struct pbase_tree *it;
int cmplen;
unsigned hash = 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.sha1, 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(unsigned char *sha1)
{
struct pbase_tree *it;
void *data;
unsigned long size;
unsigned char tree_sha1[20];
if (window <= num_preferred_base++)
return;
data = read_object_with_reference(sha1, tree_type, &size, tree_sha1);
if (!data)
return;
for (it = pbase_tree; it; it = it->next) {
if (!hashcmp(it->pcache.sha1, tree_sha1)) {
free(data);
return;
}
}
it = xcalloc(1, sizeof(*it));
it->next = pbase_tree;
pbase_tree = it;
hashcpy(it->pcache.sha1, tree_sha1);
it->pcache.tree_data = data;
it->pcache.tree_size = size;
}