This source file includes following definitions.
- lock_mutex
- unlock_mutex
- init_thread
- cleanup_thread
- mark_link
- check_object
- check_objects
- flush
- fill
- use
- open_pack_file
- parse_pack_header
- bad_object
- get_thread_data
- set_thread_data
- alloc_base_data
- free_base_data
- prune_base_data
- link_base_data
- unlink_base_data
- is_delta_type
- unpack_entry_data
- unpack_raw_entry
- unpack_data
- get_data_from_pack
- compare_ofs_delta_bases
- find_ofs_delta
- find_ofs_delta_children
- compare_ref_delta_bases
- find_ref_delta
- find_ref_delta_children
- compare_objects
- check_collison
- sha1_object
- get_base_data
- resolve_delta
- compare_and_swap_type
- find_unresolved_deltas_1
- find_unresolved_deltas
- compare_ofs_delta_entry
- compare_ref_delta_entry
- resolve_base
- threaded_second_pass
- parse_pack_objects
- resolve_deltas
- conclude_pack
- write_compressed
- append_obj_to_pack
- delta_pos_compare
- fix_unresolved_deltas
- final
- git_index_pack_config
- cmp_uint32
- read_v2_anomalous_offsets
- read_idx_option
- show_pack_info
- cmd_index_pack
#include "builtin.h"
#include "delta.h"
#include "pack.h"
#include "csum-file.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree.h"
#include "progress.h"
#include "fsck.h"
#include "exec_cmd.h"
#include "streaming.h"
#include "thread-utils.h"
static const char index_pack_usage[] =
"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
struct object_entry {
struct pack_idx_entry idx;
unsigned long size;
unsigned char hdr_size;
signed char type;
signed char real_type;
};
struct object_stat {
unsigned delta_depth;
int base_object_no;
};
struct base_data {
struct base_data *base;
struct base_data *child;
struct object_entry *obj;
void *data;
unsigned long size;
int ref_first, ref_last;
int ofs_first, ofs_last;
};
struct thread_local {
#ifndef NO_PTHREADS
pthread_t thread;
#endif
struct base_data *base_cache;
size_t base_cache_used;
int pack_fd;
};
#define FLAG_LINK (1u<<20)
#define FLAG_CHECKED (1u<<21)
struct ofs_delta_entry {
off_t offset;
int obj_no;
};
struct ref_delta_entry {
unsigned char sha1[20];
int obj_no;
};
static struct object_entry *objects;
static struct object_stat *obj_stat;
static struct ofs_delta_entry *ofs_deltas;
static struct ref_delta_entry *ref_deltas;
static struct thread_local nothread_data;
static int nr_objects;
static int nr_ofs_deltas;
static int nr_ref_deltas;
static int ref_deltas_alloc;
static int nr_resolved_deltas;
static int nr_threads;
static int from_stdin;
static int strict;
static int do_fsck_object;
static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
static int verbose;
static int show_stat;
static int check_self_contained_and_connected;
static struct progress *progress;
static unsigned char input_buffer[4096];
static unsigned int input_offset, input_len;
static off_t consumed_bytes;
static unsigned deepest_delta;
static git_SHA_CTX input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd;
static const char *curr_pack;
#ifndef NO_PTHREADS
static struct thread_local *thread_data;
static int nr_dispatched;
static int threads_active;
static pthread_mutex_t read_mutex;
#define read_lock() lock_mutex(&read_mutex)
#define read_unlock() unlock_mutex(&read_mutex)
static pthread_mutex_t counter_mutex;
#define counter_lock() lock_mutex(&counter_mutex)
#define counter_unlock() unlock_mutex(&counter_mutex)
static pthread_mutex_t work_mutex;
#define work_lock() lock_mutex(&work_mutex)
#define work_unlock() unlock_mutex(&work_mutex)
static pthread_mutex_t deepest_delta_mutex;
#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
static pthread_mutex_t type_cas_mutex;
#define type_cas_lock() lock_mutex(&type_cas_mutex)
#define type_cas_unlock() unlock_mutex(&type_cas_mutex)
static pthread_key_t key;
static inline void lock_mutex(pthread_mutex_t *mutex)
{
if (threads_active)
pthread_mutex_lock(mutex);
}
static inline void unlock_mutex(pthread_mutex_t *mutex)
{
if (threads_active)
pthread_mutex_unlock(mutex);
}
static void init_thread(void)
{
int i;
init_recursive_mutex(&read_mutex);
pthread_mutex_init(&counter_mutex, NULL);
pthread_mutex_init(&work_mutex, NULL);
pthread_mutex_init(&type_cas_mutex, NULL);
if (show_stat)
pthread_mutex_init(&deepest_delta_mutex, NULL);
pthread_key_create(&key, NULL);
thread_data = xcalloc(nr_threads, sizeof(*thread_data));
for (i = 0; i < nr_threads; i++) {
thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
if (thread_data[i].pack_fd == -1)
die_errno(_("unable to open %s"), curr_pack);
}
threads_active = 1;
}
static void cleanup_thread(void)
{
int i;
if (!threads_active)
return;
threads_active = 0;
pthread_mutex_destroy(&read_mutex);
pthread_mutex_destroy(&counter_mutex);
pthread_mutex_destroy(&work_mutex);
pthread_mutex_destroy(&type_cas_mutex);
if (show_stat)
pthread_mutex_destroy(&deepest_delta_mutex);
for (i = 0; i < nr_threads; i++)
close(thread_data[i].pack_fd);
pthread_key_delete(key);
free(thread_data);
}
#else
#define read_lock()
#define read_unlock()
#define counter_lock()
#define counter_unlock()
#define work_lock()
#define work_unlock()
#define deepest_delta_lock()
#define deepest_delta_unlock()
#define type_cas_lock()
#define type_cas_unlock()
#endif
static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
{
if (!obj)
return -1;
if (type != OBJ_ANY && obj->type != type)
die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
obj->flags |= FLAG_LINK;
return 0;
}
static unsigned check_object(struct object *obj)
{
if (!obj)
return 0;
if (!(obj->flags & FLAG_LINK))
return 0;
if (!(obj->flags & FLAG_CHECKED)) {
unsigned long size;
int type = sha1_object_info(obj->sha1, &size);
if (type <= 0)
die(_("did not receive expected object %s"),
sha1_to_hex(obj->sha1));
if (type != obj->type)
die(_("object %s: expected type %s, found %s"),
sha1_to_hex(obj->sha1),
typename(obj->type), typename(type));
obj->flags |= FLAG_CHECKED;
return 1;
}
return 0;
}
static unsigned check_objects(void)
{
unsigned i, max, foreign_nr = 0;
max = get_max_object_index();
for (i = 0; i < max; i++)
foreign_nr += check_object(get_indexed_object(i));
return foreign_nr;
}
static void flush(void)
{
if (input_offset) {
if (output_fd >= 0)
write_or_die(output_fd, input_buffer, input_offset);
git_SHA1_Update(&input_ctx, input_buffer, input_offset);
memmove(input_buffer, input_buffer + input_offset, input_len);
input_offset = 0;
}
}
static void *fill(int min)
{
if (min <= input_len)
return input_buffer + input_offset;
if (min > sizeof(input_buffer))
die(Q_("cannot fill %d byte",
"cannot fill %d bytes",
min),
min);
flush();
do {
ssize_t ret = xread(input_fd, input_buffer + input_len,
sizeof(input_buffer) - input_len);
if (ret <= 0) {
if (!ret)
die(_("early EOF"));
die_errno(_("read error on input"));
}
input_len += ret;
if (from_stdin)
display_throughput(progress, consumed_bytes + input_len);
} while (input_len < min);
return input_buffer;
}
static void use(int bytes)
{
if (bytes > input_len)
die(_("used more bytes than were available"));
input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
input_len -= bytes;
input_offset += bytes;
if (signed_add_overflows(consumed_bytes, bytes))
die(_("pack too large for current definition of off_t"));
consumed_bytes += bytes;
}
static const char *open_pack_file(const char *pack_name)
{
if (from_stdin) {
input_fd = 0;
if (!pack_name) {
static char tmp_file[PATH_MAX];
output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
"pack/tmp_pack_XXXXXX");
pack_name = xstrdup(tmp_file);
} else
output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
if (output_fd < 0)
die_errno(_("unable to create '%s'"), pack_name);
nothread_data.pack_fd = output_fd;
} else {
input_fd = open(pack_name, O_RDONLY);
if (input_fd < 0)
die_errno(_("cannot open packfile '%s'"), pack_name);
output_fd = -1;
nothread_data.pack_fd = input_fd;
}
git_SHA1_Init(&input_ctx);
return pack_name;
}
static void parse_pack_header(void)
{
struct pack_header *hdr = fill(sizeof(struct pack_header));
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
die(_("pack signature mismatch"));
if (!pack_version_ok(hdr->hdr_version))
die(_("pack version %"PRIu32" unsupported"),
ntohl(hdr->hdr_version));
nr_objects = ntohl(hdr->hdr_entries);
use(sizeof(struct pack_header));
}
static NORETURN void bad_object(unsigned long offset, const char *format,
...) __attribute__((format (printf, 2, 3)));
static NORETURN void bad_object(unsigned long offset, const char *format, ...)
{
va_list params;
char buf[1024];
va_start(params, format);
vsnprintf(buf, sizeof(buf), format, params);
va_end(params);
die(_("pack has bad object at offset %lu: %s"), offset, buf);
}
static inline struct thread_local *get_thread_data(void)
{
#ifndef NO_PTHREADS
if (threads_active)
return pthread_getspecific(key);
assert(!threads_active &&
"This should only be reached when all threads are gone");
#endif
return ¬hread_data;
}
#ifndef NO_PTHREADS
static void set_thread_data(struct thread_local *data)
{
if (threads_active)
pthread_setspecific(key, data);
}
#endif
static struct base_data *alloc_base_data(void)
{
struct base_data *base = xcalloc(1, sizeof(struct base_data));
base->ref_last = -1;
base->ofs_last = -1;
return base;
}
static void free_base_data(struct base_data *c)
{
if (c->data) {
free(c->data);
c->data = NULL;
get_thread_data()->base_cache_used -= c->size;
}
}
static void prune_base_data(struct base_data *retain)
{
struct base_data *b;
struct thread_local *data = get_thread_data();
for (b = data->base_cache;
data->base_cache_used > delta_base_cache_limit && b;
b = b->child) {
if (b->data && b != retain)
free_base_data(b);
}
}
static void link_base_data(struct base_data *base, struct base_data *c)
{
if (base)
base->child = c;
else
get_thread_data()->base_cache = c;
c->base = base;
c->child = NULL;
if (c->data)
get_thread_data()->base_cache_used += c->size;
prune_base_data(c);
}
static void unlink_base_data(struct base_data *c)
{
struct base_data *base = c->base;
if (base)
base->child = NULL;
else
get_thread_data()->base_cache = NULL;
free_base_data(c);
}
static int is_delta_type(enum object_type type)
{
return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
}
static void *unpack_entry_data(unsigned long offset, unsigned long size,
enum object_type type, unsigned char *sha1)
{
static char fixed_buf[8192];
int status;
git_zstream stream;
void *buf;
git_SHA_CTX c;
char hdr[32];
int hdrlen;
if (!is_delta_type(type)) {
hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
git_SHA1_Init(&c);
git_SHA1_Update(&c, hdr, hdrlen);
} else
sha1 = NULL;
if (type == OBJ_BLOB && size > big_file_threshold)
buf = fixed_buf;
else
buf = xmallocz(size);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = buf;
stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
do {
unsigned char *last_out = stream.next_out;
stream.next_in = fill(1);
stream.avail_in = input_len;
status = git_inflate(&stream, 0);
use(input_len - stream.avail_in);
if (sha1)
git_SHA1_Update(&c, last_out, stream.next_out - last_out);
if (buf == fixed_buf) {
stream.next_out = buf;
stream.avail_out = sizeof(fixed_buf);
}
} while (status == Z_OK);
if (stream.total_out != size || status != Z_STREAM_END)
bad_object(offset, _("inflate returned %d"), status);
git_inflate_end(&stream);
if (sha1)
git_SHA1_Final(sha1, &c);
return buf == fixed_buf ? NULL : buf;
}
static void *unpack_raw_entry(struct object_entry *obj,
off_t *ofs_offset,
unsigned char *ref_sha1,
unsigned char *sha1)
{
unsigned char *p;
unsigned long size, c;
off_t base_offset;
unsigned shift;
void *data;
obj->idx.offset = consumed_bytes;
input_crc32 = crc32(0, NULL, 0);
p = fill(1);
c = *p;
use(1);
obj->type = (c >> 4) & 7;
size = (c & 15);
shift = 4;
while (c & 0x80) {
p = fill(1);
c = *p;
use(1);
size += (c & 0x7f) << shift;
shift += 7;
}
obj->size = size;
switch (obj->type) {
case OBJ_REF_DELTA:
hashcpy(ref_sha1, fill(20));
use(20);
break;
case OBJ_OFS_DELTA:
p = fill(1);
c = *p;
use(1);
base_offset = c & 127;
while (c & 128) {
base_offset += 1;
if (!base_offset || MSB(base_offset, 7))
bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
p = fill(1);
c = *p;
use(1);
base_offset = (base_offset << 7) + (c & 127);
}
*ofs_offset = obj->idx.offset - base_offset;
if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
bad_object(obj->idx.offset, _("delta base offset is out of bound"));
break;
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_BLOB:
case OBJ_TAG:
break;
default:
bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
}
obj->hdr_size = consumed_bytes - obj->idx.offset;
data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
obj->idx.crc32 = input_crc32;
return data;
}
static void *unpack_data(struct object_entry *obj,
int (*consume)(const unsigned char *, unsigned long, void *),
void *cb_data)
{
off_t from = obj[0].idx.offset + obj[0].hdr_size;
unsigned long len = obj[1].idx.offset - from;
unsigned char *data, *inbuf;
git_zstream stream;
int status;
data = xmallocz(consume ? 64*1024 : obj->size);
inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = data;
stream.avail_out = consume ? 64*1024 : obj->size;
do {
ssize_t n = (len < 64*1024) ? len : 64*1024;
n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
if (n < 0)
die_errno(_("cannot pread pack file"));
if (!n)
die(Q_("premature end of pack file, %lu byte missing",
"premature end of pack file, %lu bytes missing",
len),
len);
from += n;
len -= n;
stream.next_in = inbuf;
stream.avail_in = n;
if (!consume)
status = git_inflate(&stream, 0);
else {
do {
status = git_inflate(&stream, 0);
if (consume(data, stream.next_out - data, cb_data)) {
free(inbuf);
free(data);
return NULL;
}
stream.next_out = data;
stream.avail_out = 64*1024;
} while (status == Z_OK && stream.avail_in);
}
} while (len && status == Z_OK && !stream.avail_in);
if (status != Z_STREAM_END || stream.total_out != obj->size)
die(_("serious inflate inconsistency"));
git_inflate_end(&stream);
free(inbuf);
if (consume) {
free(data);
data = NULL;
}
return data;
}
static void *get_data_from_pack(struct object_entry *obj)
{
return unpack_data(obj, NULL, NULL);
}
static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return offset1 < offset2 ? -1 :
offset1 > offset2 ? 1 :
0;
}
static int find_ofs_delta(const off_t offset, enum object_type type)
{
int first = 0, last = nr_ofs_deltas;
while (first < last) {
int next = (first + last) / 2;
struct ofs_delta_entry *delta = &ofs_deltas[next];
int cmp;
cmp = compare_ofs_delta_bases(offset, delta->offset,
type, objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
return -first-1;
}
static void find_ofs_delta_children(off_t offset,
int *first_index, int *last_index,
enum object_type type)
{
int first = find_ofs_delta(offset, type);
int last = first;
int end = nr_ofs_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && ofs_deltas[first - 1].offset == offset)
--first;
while (last < end && ofs_deltas[last + 1].offset == offset)
++last;
*first_index = first;
*last_index = last;
}
static int compare_ref_delta_bases(const unsigned char *sha1,
const unsigned char *sha2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return hashcmp(sha1, sha2);
}
static int find_ref_delta(const unsigned char *sha1, enum object_type type)
{
int first = 0, last = nr_ref_deltas;
while (first < last) {
int next = (first + last) / 2;
struct ref_delta_entry *delta = &ref_deltas[next];
int cmp;
cmp = compare_ref_delta_bases(sha1, delta->sha1,
type, objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
return -first-1;
}
static void find_ref_delta_children(const unsigned char *sha1,
int *first_index, int *last_index,
enum object_type type)
{
int first = find_ref_delta(sha1, type);
int last = first;
int end = nr_ref_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
--first;
while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
++last;
*first_index = first;
*last_index = last;
}
struct compare_data {
struct object_entry *entry;
struct git_istream *st;
unsigned char *buf;
unsigned long buf_size;
};
static int compare_objects(const unsigned char *buf, unsigned long size,
void *cb_data)
{
struct compare_data *data = cb_data;
if (data->buf_size < size) {
free(data->buf);
data->buf = xmalloc(size);
data->buf_size = size;
}
while (size) {
ssize_t len = read_istream(data->st, data->buf, size);
if (len == 0)
die(_("SHA1 COLLISION FOUND WITH %s !"),
sha1_to_hex(data->entry->idx.sha1));
if (len < 0)
die(_("unable to read %s"),
sha1_to_hex(data->entry->idx.sha1));
if (memcmp(buf, data->buf, len))
die(_("SHA1 COLLISION FOUND WITH %s !"),
sha1_to_hex(data->entry->idx.sha1));
size -= len;
buf += len;
}
return 0;
}
static int check_collison(struct object_entry *entry)
{
struct compare_data data;
enum object_type type;
unsigned long size;
if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
return -1;
memset(&data, 0, sizeof(data));
data.entry = entry;
data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
if (!data.st)
return -1;
if (size != entry->size || type != entry->type)
die(_("SHA1 COLLISION FOUND WITH %s !"),
sha1_to_hex(entry->idx.sha1));
unpack_data(entry, compare_objects, &data);
close_istream(data.st);
free(data.buf);
return 0;
}
static void sha1_object(const void *data, struct object_entry *obj_entry,
unsigned long size, enum object_type type,
const unsigned char *sha1)
{
void *new_data = NULL;
int collision_test_needed;
assert(data || obj_entry);
read_lock();
collision_test_needed = has_sha1_file_with_flags(sha1, HAS_SHA1_QUICK);
read_unlock();
if (collision_test_needed && !data) {
read_lock();
if (!check_collison(obj_entry))
collision_test_needed = 0;
read_unlock();
}
if (collision_test_needed) {
void *has_data;
enum object_type has_type;
unsigned long has_size;
read_lock();
has_type = sha1_object_info(sha1, &has_size);
if (has_type != type || has_size != size)
die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
has_data = read_sha1_file(sha1, &has_type, &has_size);
read_unlock();
if (!data)
data = new_data = get_data_from_pack(obj_entry);
if (!has_data)
die(_("cannot read existing object %s"), sha1_to_hex(sha1));
if (size != has_size || type != has_type ||
memcmp(data, has_data, size) != 0)
die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
free(has_data);
}
if (strict) {
read_lock();
if (type == OBJ_BLOB) {
struct blob *blob = lookup_blob(sha1);
if (blob)
blob->object.flags |= FLAG_CHECKED;
else
die(_("invalid blob object %s"), sha1_to_hex(sha1));
} else {
struct object *obj;
int eaten;
void *buf = (void *) data;
assert(data && "data can only be NULL for large _blobs_");
obj = parse_object_buffer(sha1, type, size, buf, &eaten);
if (!obj)
die(_("invalid %s"), typename(type));
if (do_fsck_object &&
fsck_object(obj, buf, size, &fsck_options))
die(_("Error in object"));
if (fsck_walk(obj, NULL, &fsck_options))
die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
if (obj->type == OBJ_TREE) {
struct tree *item = (struct tree *) obj;
item->buffer = NULL;
obj->parsed = 0;
}
if (obj->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *) obj;
if (detach_commit_buffer(commit, NULL) != data)
die("BUG: parse_object_buffer transmogrified our buffer");
}
obj->flags |= FLAG_CHECKED;
}
read_unlock();
}
free(new_data);
}
static void *get_base_data(struct base_data *c)
{
if (!c->data) {
struct object_entry *obj = c->obj;
struct base_data **delta = NULL;
int delta_nr = 0, delta_alloc = 0;
while (is_delta_type(c->obj->type) && !c->data) {
ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
delta[delta_nr++] = c;
c = c->base;
}
if (!delta_nr) {
c->data = get_data_from_pack(obj);
c->size = obj->size;
get_thread_data()->base_cache_used += c->size;
prune_base_data(c);
}
for (; delta_nr > 0; delta_nr--) {
void *base, *raw;
c = delta[delta_nr - 1];
obj = c->obj;
base = get_base_data(c->base);
raw = get_data_from_pack(obj);
c->data = patch_delta(
base, c->base->size,
raw, obj->size,
&c->size);
free(raw);
if (!c->data)
bad_object(obj->idx.offset, _("failed to apply delta"));
get_thread_data()->base_cache_used += c->size;
prune_base_data(c);
}
free(delta);
}
return c->data;
}
static void resolve_delta(struct object_entry *delta_obj,
struct base_data *base, struct base_data *result)
{
void *base_data, *delta_data;
if (show_stat) {
int i = delta_obj - objects;
int j = base->obj - objects;
obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
deepest_delta_lock();
if (deepest_delta < obj_stat[i].delta_depth)
deepest_delta = obj_stat[i].delta_depth;
deepest_delta_unlock();
obj_stat[i].base_object_no = j;
}
delta_data = get_data_from_pack(delta_obj);
base_data = get_base_data(base);
result->obj = delta_obj;
result->data = patch_delta(base_data, base->size,
delta_data, delta_obj->size, &result->size);
free(delta_data);
if (!result->data)
bad_object(delta_obj->idx.offset, _("failed to apply delta"));
hash_sha1_file(result->data, result->size,
typename(delta_obj->real_type), delta_obj->idx.sha1);
sha1_object(result->data, NULL, result->size, delta_obj->real_type,
delta_obj->idx.sha1);
counter_lock();
nr_resolved_deltas++;
counter_unlock();
}
static int compare_and_swap_type(signed char *type,
enum object_type want,
enum object_type set)
{
enum object_type old;
type_cas_lock();
old = *type;
if (old == want)
*type = set;
type_cas_unlock();
return old == want;
}
static struct base_data *find_unresolved_deltas_1(struct base_data *base,
struct base_data *prev_base)
{
if (base->ref_last == -1 && base->ofs_last == -1) {
find_ref_delta_children(base->obj->idx.sha1,
&base->ref_first, &base->ref_last,
OBJ_REF_DELTA);
find_ofs_delta_children(base->obj->idx.offset,
&base->ofs_first, &base->ofs_last,
OBJ_OFS_DELTA);
if (base->ref_last == -1 && base->ofs_last == -1) {
free(base->data);
return NULL;
}
link_base_data(prev_base, base);
}
if (base->ref_first <= base->ref_last) {
struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
struct base_data *result = alloc_base_data();
if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
base->obj->real_type))
die("BUG: child->real_type != OBJ_REF_DELTA");
resolve_delta(child, base, result);
if (base->ref_first == base->ref_last && base->ofs_last == -1)
free_base_data(base);
base->ref_first++;
return result;
}
if (base->ofs_first <= base->ofs_last) {
struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
struct base_data *result = alloc_base_data();
assert(child->real_type == OBJ_OFS_DELTA);
child->real_type = base->obj->real_type;
resolve_delta(child, base, result);
if (base->ofs_first == base->ofs_last)
free_base_data(base);
base->ofs_first++;
return result;
}
unlink_base_data(base);
return NULL;
}
static void find_unresolved_deltas(struct base_data *base)
{
struct base_data *new_base, *prev_base = NULL;
for (;;) {
new_base = find_unresolved_deltas_1(base, prev_base);
if (new_base) {
prev_base = base;
base = new_base;
} else {
free(base);
base = prev_base;
if (!base)
return;
prev_base = base->base;
}
}
}
static int compare_ofs_delta_entry(const void *a, const void *b)
{
const struct ofs_delta_entry *delta_a = a;
const struct ofs_delta_entry *delta_b = b;
return delta_a->offset < delta_b->offset ? -1 :
delta_a->offset > delta_b->offset ? 1 :
0;
}
static int compare_ref_delta_entry(const void *a, const void *b)
{
const struct ref_delta_entry *delta_a = a;
const struct ref_delta_entry *delta_b = b;
return hashcmp(delta_a->sha1, delta_b->sha1);
}
static void resolve_base(struct object_entry *obj)
{
struct base_data *base_obj = alloc_base_data();
base_obj->obj = obj;
base_obj->data = NULL;
find_unresolved_deltas(base_obj);
}
#ifndef NO_PTHREADS
static void *threaded_second_pass(void *data)
{
set_thread_data(data);
for (;;) {
int i;
counter_lock();
display_progress(progress, nr_resolved_deltas);
counter_unlock();
work_lock();
while (nr_dispatched < nr_objects &&
is_delta_type(objects[nr_dispatched].type))
nr_dispatched++;
if (nr_dispatched >= nr_objects) {
work_unlock();
break;
}
i = nr_dispatched++;
work_unlock();
resolve_base(&objects[i]);
}
return NULL;
}
#endif
static void parse_pack_objects(unsigned char *sha1)
{
int i, nr_delays = 0;
struct ofs_delta_entry *ofs_delta = ofs_deltas;
unsigned char ref_delta_sha1[20];
struct stat st;
if (verbose)
progress = start_progress(
from_stdin ? _("Receiving objects") : _("Indexing objects"),
nr_objects);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
void *data = unpack_raw_entry(obj, &ofs_delta->offset,
ref_delta_sha1, obj->idx.sha1);
obj->real_type = obj->type;
if (obj->type == OBJ_OFS_DELTA) {
nr_ofs_deltas++;
ofs_delta->obj_no = i;
ofs_delta++;
} else if (obj->type == OBJ_REF_DELTA) {
ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
ref_deltas[nr_ref_deltas].obj_no = i;
nr_ref_deltas++;
} else if (!data) {
obj->real_type = OBJ_BAD;
nr_delays++;
} else
sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
free(data);
display_progress(progress, i+1);
}
objects[i].idx.offset = consumed_bytes;
stop_progress(&progress);
flush();
git_SHA1_Final(sha1, &input_ctx);
if (hashcmp(fill(20), sha1))
die(_("pack is corrupted (SHA1 mismatch)"));
use(20);
if (fstat(input_fd, &st))
die_errno(_("cannot fstat packfile"));
if (S_ISREG(st.st_mode) &&
lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
die(_("pack has junk at the end"));
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
if (obj->real_type != OBJ_BAD)
continue;
obj->real_type = obj->type;
sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
nr_delays--;
}
if (nr_delays)
die(_("confusion beyond insanity in parse_pack_objects()"));
}
static void resolve_deltas(void)
{
int i;
if (!nr_ofs_deltas && !nr_ref_deltas)
return;
qsort(ofs_deltas, nr_ofs_deltas, sizeof(struct ofs_delta_entry),
compare_ofs_delta_entry);
qsort(ref_deltas, nr_ref_deltas, sizeof(struct ref_delta_entry),
compare_ref_delta_entry);
if (verbose)
progress = start_progress(_("Resolving deltas"),
nr_ref_deltas + nr_ofs_deltas);
#ifndef NO_PTHREADS
nr_dispatched = 0;
if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
init_thread();
for (i = 0; i < nr_threads; i++) {
int ret = pthread_create(&thread_data[i].thread, NULL,
threaded_second_pass, thread_data + i);
if (ret)
die(_("unable to create thread: %s"),
strerror(ret));
}
for (i = 0; i < nr_threads; i++)
pthread_join(thread_data[i].thread, NULL);
cleanup_thread();
return;
}
#endif
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
if (is_delta_type(obj->type))
continue;
resolve_base(obj);
display_progress(progress, nr_resolved_deltas);
}
}
static void fix_unresolved_deltas(struct sha1file *f);
static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
{
if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
stop_progress(&progress);
flush();
return;
}
if (fix_thin_pack) {
struct sha1file *f;
unsigned char read_sha1[20], tail_sha1[20];
struct strbuf msg = STRBUF_INIT;
int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
int nr_objects_initial = nr_objects;
if (nr_unresolved <= 0)
die(_("confusion beyond insanity"));
REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
memset(objects + nr_objects + 1, 0,
nr_unresolved * sizeof(*objects));
f = sha1fd(output_fd, curr_pack);
fix_unresolved_deltas(f);
strbuf_addf(&msg, _("completed with %d local objects"),
nr_objects - nr_objects_initial);
stop_progress_msg(&progress, msg.buf);
strbuf_release(&msg);
sha1close(f, tail_sha1, 0);
hashcpy(read_sha1, pack_sha1);
fixup_pack_header_footer(output_fd, pack_sha1,
curr_pack, nr_objects,
read_sha1, consumed_bytes-20);
if (hashcmp(read_sha1, tail_sha1) != 0)
die(_("Unexpected tail checksum for %s "
"(disk corruption?)"), curr_pack);
}
if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
die(Q_("pack has %d unresolved delta",
"pack has %d unresolved deltas",
nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
}
static int write_compressed(struct sha1file *f, void *in, unsigned int size)
{
git_zstream stream;
int status;
unsigned char outbuf[4096];
git_deflate_init(&stream, zlib_compression_level);
stream.next_in = in;
stream.avail_in = size;
do {
stream.next_out = outbuf;
stream.avail_out = sizeof(outbuf);
status = git_deflate(&stream, Z_FINISH);
sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
} while (status == Z_OK);
if (status != Z_STREAM_END)
die(_("unable to deflate appended object (%d)"), status);
size = stream.total_out;
git_deflate_end(&stream);
return size;
}
static struct object_entry *append_obj_to_pack(struct sha1file *f,
const unsigned char *sha1, void *buf,
unsigned long size, enum object_type type)
{
struct object_entry *obj = &objects[nr_objects++];
unsigned char header[10];
unsigned long s = size;
int n = 0;
unsigned char c = (type << 4) | (s & 15);
s >>= 4;
while (s) {
header[n++] = c | 0x80;
c = s & 0x7f;
s >>= 7;
}
header[n++] = c;
crc32_begin(f);
sha1write(f, header, n);
obj[0].size = size;
obj[0].hdr_size = n;
obj[0].type = type;
obj[0].real_type = type;
obj[1].idx.offset = obj[0].idx.offset + n;
obj[1].idx.offset += write_compressed(f, buf, size);
obj[0].idx.crc32 = crc32_end(f);
sha1flush(f);
hashcpy(obj->idx.sha1, sha1);
return obj;
}
static int delta_pos_compare(const void *_a, const void *_b)
{
struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
return a->obj_no - b->obj_no;
}
static void fix_unresolved_deltas(struct sha1file *f)
{
struct ref_delta_entry **sorted_by_pos;
int i;
sorted_by_pos = xmalloc(nr_ref_deltas * sizeof(*sorted_by_pos));
for (i = 0; i < nr_ref_deltas; i++)
sorted_by_pos[i] = &ref_deltas[i];
qsort(sorted_by_pos, nr_ref_deltas, sizeof(*sorted_by_pos), delta_pos_compare);
for (i = 0; i < nr_ref_deltas; i++) {
struct ref_delta_entry *d = sorted_by_pos[i];
enum object_type type;
struct base_data *base_obj = alloc_base_data();
if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
continue;
base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
if (!base_obj->data)
continue;
if (check_sha1_signature(d->sha1, base_obj->data,
base_obj->size, typename(type)))
die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
base_obj->obj = append_obj_to_pack(f, d->sha1,
base_obj->data, base_obj->size, type);
find_unresolved_deltas(base_obj);
display_progress(progress, nr_resolved_deltas);
}
free(sorted_by_pos);
}
static void final(const char *final_pack_name, const char *curr_pack_name,
const char *final_index_name, const char *curr_index_name,
const char *keep_name, const char *keep_msg,
unsigned char *sha1)
{
const char *report = "pack";
char name[PATH_MAX];
int err;
if (!from_stdin) {
close(input_fd);
} else {
fsync_or_die(output_fd, curr_pack_name);
err = close(output_fd);
if (err)
die_errno(_("error while closing pack file"));
}
if (keep_msg) {
int keep_fd, keep_msg_len = strlen(keep_msg);
if (!keep_name)
keep_fd = odb_pack_keep(name, sizeof(name), sha1);
else
keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
if (keep_fd < 0) {
if (errno != EEXIST)
die_errno(_("cannot write keep file '%s'"),
keep_name ? keep_name : name);
} else {
if (keep_msg_len > 0) {
write_or_die(keep_fd, keep_msg, keep_msg_len);
write_or_die(keep_fd, "\n", 1);
}
if (close(keep_fd) != 0)
die_errno(_("cannot close written keep file '%s'"),
keep_name ? keep_name : name);
report = "keep";
}
}
if (final_pack_name != curr_pack_name) {
if (!final_pack_name) {
snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
get_object_directory(), sha1_to_hex(sha1));
final_pack_name = name;
}
if (finalize_object_file(curr_pack_name, final_pack_name))
die(_("cannot store pack file"));
} else if (from_stdin)
chmod(final_pack_name, 0444);
if (final_index_name != curr_index_name) {
if (!final_index_name) {
snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
get_object_directory(), sha1_to_hex(sha1));
final_index_name = name;
}
if (finalize_object_file(curr_index_name, final_index_name))
die(_("cannot store index file"));
} else
chmod(final_index_name, 0444);
if (!from_stdin) {
printf("%s\n", sha1_to_hex(sha1));
} else {
char buf[48];
int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
report, sha1_to_hex(sha1));
write_or_die(1, buf, len);
while (input_len) {
err = xwrite(1, input_buffer + input_offset, input_len);
if (err <= 0)
break;
input_len -= err;
input_offset += err;
}
}
}
static int git_index_pack_config(const char *k, const char *v, void *cb)
{
struct pack_idx_option *opts = cb;
if (!strcmp(k, "pack.indexversion")) {
opts->version = git_config_int(k, v);
if (opts->version > 2)
die(_("bad pack.indexversion=%"PRIu32), opts->version);
return 0;
}
if (!strcmp(k, "pack.threads")) {
nr_threads = git_config_int(k, v);
if (nr_threads < 0)
die(_("invalid number of threads specified (%d)"),
nr_threads);
#ifdef NO_PTHREADS
if (nr_threads != 1)
warning(_("no threads support, ignoring %s"), k);
nr_threads = 1;
#endif
return 0;
}
return git_default_config(k, v, cb);
}
static int cmp_uint32(const void *a_, const void *b_)
{
uint32_t a = *((uint32_t *)a_);
uint32_t b = *((uint32_t *)b_);
return (a < b) ? -1 : (a != b);
}
static void read_v2_anomalous_offsets(struct packed_git *p,
struct pack_idx_option *opts)
{
const uint32_t *idx1, *idx2;
uint32_t i;
idx1 = (((const uint32_t *)p->index_data)
+ 2
+ 256
+ 5 * p->num_objects
+ p->num_objects
);
idx2 = idx1 + p->num_objects;
for (i = 0; i < p->num_objects; i++) {
uint32_t off = ntohl(idx1[i]);
if (!(off & 0x80000000))
continue;
off = off & 0x7fffffff;
if (idx2[off * 2])
continue;
ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
}
if (1 < opts->anomaly_nr)
qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
}
static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
{
struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
if (!p)
die(_("Cannot open existing pack file '%s'"), pack_name);
if (open_pack_index(p))
die(_("Cannot open existing pack idx file for '%s'"), pack_name);
opts->version = p->index_version;
if (opts->version == 2)
read_v2_anomalous_offsets(p, opts);
close_pack_index(p);
free(p);
}
static void show_pack_info(int stat_only)
{
int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
unsigned long *chain_histogram = NULL;
if (deepest_delta)
chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
if (is_delta_type(obj->type))
chain_histogram[obj_stat[i].delta_depth - 1]++;
if (stat_only)
continue;
printf("%s %-6s %lu %lu %"PRIuMAX,
sha1_to_hex(obj->idx.sha1),
typename(obj->real_type), obj->size,
(unsigned long)(obj[1].idx.offset - obj->idx.offset),
(uintmax_t)obj->idx.offset);
if (is_delta_type(obj->type)) {
struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
printf(" %u %s", obj_stat[i].delta_depth, sha1_to_hex(bobj->idx.sha1));
}
putchar('\n');
}
if (baseobjects)
printf_ln(Q_("non delta: %d object",
"non delta: %d objects",
baseobjects),
baseobjects);
for (i = 0; i < deepest_delta; i++) {
if (!chain_histogram[i])
continue;
printf_ln(Q_("chain length = %d: %lu object",
"chain length = %d: %lu objects",
chain_histogram[i]),
i + 1,
chain_histogram[i]);
}
}
int cmd_index_pack(int argc, const char **argv, const char *prefix)
{
int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
const char *curr_index;
const char *index_name = NULL, *pack_name = NULL;
const char *keep_name = NULL, *keep_msg = NULL;
struct strbuf index_name_buf = STRBUF_INIT,
keep_name_buf = STRBUF_INIT;
struct pack_idx_entry **idx_objects;
struct pack_idx_option opts;
unsigned char pack_sha1[20];
unsigned foreign_nr = 1;
if (argc == 2 && !strcmp(argv[1], "-h"))
usage(index_pack_usage);
check_replace_refs = 0;
fsck_options.walk = mark_link;
reset_pack_idx_option(&opts);
git_config(git_index_pack_config, &opts);
if (prefix && chdir(prefix))
die(_("Cannot come back to cwd"));
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (*arg == '-') {
if (!strcmp(arg, "--stdin")) {
from_stdin = 1;
} else if (!strcmp(arg, "--fix-thin")) {
fix_thin_pack = 1;
} else if (!strcmp(arg, "--strict")) {
strict = 1;
do_fsck_object = 1;
} else if (skip_prefix(arg, "--strict=", &arg)) {
strict = 1;
do_fsck_object = 1;
fsck_set_msg_types(&fsck_options, arg);
} else if (!strcmp(arg, "--check-self-contained-and-connected")) {
strict = 1;
check_self_contained_and_connected = 1;
} else if (!strcmp(arg, "--verify")) {
verify = 1;
} else if (!strcmp(arg, "--verify-stat")) {
verify = 1;
show_stat = 1;
} else if (!strcmp(arg, "--verify-stat-only")) {
verify = 1;
show_stat = 1;
stat_only = 1;
} else if (!strcmp(arg, "--keep")) {
keep_msg = "";
} else if (starts_with(arg, "--keep=")) {
keep_msg = arg + 7;
} else if (starts_with(arg, "--threads=")) {
char *end;
nr_threads = strtoul(arg+10, &end, 0);
if (!arg[10] || *end || nr_threads < 0)
usage(index_pack_usage);
#ifdef NO_PTHREADS
if (nr_threads != 1)
warning(_("no threads support, "
"ignoring %s"), arg);
nr_threads = 1;
#endif
} else if (starts_with(arg, "--pack_header=")) {
struct pack_header *hdr;
char *c;
hdr = (struct pack_header *)input_buffer;
hdr->hdr_signature = htonl(PACK_SIGNATURE);
hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
if (*c != ',')
die(_("bad %s"), arg);
hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
if (*c)
die(_("bad %s"), arg);
input_len = sizeof(*hdr);
} else if (!strcmp(arg, "-v")) {
verbose = 1;
} else if (!strcmp(arg, "-o")) {
if (index_name || (i+1) >= argc)
usage(index_pack_usage);
index_name = argv[++i];
} else if (starts_with(arg, "--index-version=")) {
char *c;
opts.version = strtoul(arg + 16, &c, 10);
if (opts.version > 2)
die(_("bad %s"), arg);
if (*c == ',')
opts.off32_limit = strtoul(c+1, &c, 0);
if (*c || opts.off32_limit & 0x80000000)
die(_("bad %s"), arg);
} else
usage(index_pack_usage);
continue;
}
if (pack_name)
usage(index_pack_usage);
pack_name = arg;
}
if (!pack_name && !from_stdin)
usage(index_pack_usage);
if (fix_thin_pack && !from_stdin)
die(_("--fix-thin cannot be used without --stdin"));
if (!index_name && pack_name) {
size_t len;
if (!strip_suffix(pack_name, ".pack", &len))
die(_("packfile name '%s' does not end with '.pack'"),
pack_name);
strbuf_add(&index_name_buf, pack_name, len);
strbuf_addstr(&index_name_buf, ".idx");
index_name = index_name_buf.buf;
}
if (keep_msg && !keep_name && pack_name) {
size_t len;
if (!strip_suffix(pack_name, ".pack", &len))
die(_("packfile name '%s' does not end with '.pack'"),
pack_name);
strbuf_add(&keep_name_buf, pack_name, len);
strbuf_addstr(&keep_name_buf, ".idx");
keep_name = keep_name_buf.buf;
}
if (verify) {
if (!index_name)
die(_("--verify with no packfile name given"));
read_idx_option(&opts, index_name);
opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
}
if (strict)
opts.flags |= WRITE_IDX_STRICT;
#ifndef NO_PTHREADS
if (!nr_threads) {
nr_threads = online_cpus();
if (nr_threads > 3)
nr_threads = 3;
}
#endif
curr_pack = open_pack_file(pack_name);
parse_pack_header();
objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
if (show_stat)
obj_stat = xcalloc(nr_objects + 1, sizeof(struct object_stat));
ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
parse_pack_objects(pack_sha1);
resolve_deltas();
conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
free(ofs_deltas);
free(ref_deltas);
if (strict)
foreign_nr = check_objects();
if (show_stat)
show_pack_info(stat_only);
idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
for (i = 0; i < nr_objects; i++)
idx_objects[i] = &objects[i].idx;
curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
free(idx_objects);
if (!verify)
final(pack_name, curr_pack,
index_name, curr_index,
keep_name, keep_msg,
pack_sha1);
else
close(input_fd);
free(objects);
strbuf_release(&index_name_buf);
strbuf_release(&keep_name_buf);
if (pack_name == NULL)
free((void *) curr_pack);
if (index_name == NULL)
free((void *) curr_index);
if (check_self_contained_and_connected && foreign_nr)
return 1;
return 0;
}