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git/builtin/index-pack.c

1956 lines
52 KiB

#include "builtin.h"
#include "config.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"
#include "packfile.h"
#include "object-store.h"
#include "promisor-remote.h"
static const char index_pack_usage[] =
"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--[no-]rev-index] [--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 {
/* Initialized by make_base(). */
struct base_data *base;
struct object_entry *obj;
int ref_first, ref_last;
int ofs_first, ofs_last;
/*
* Threads should increment retain_data if they are about to call
* patch_delta() using this struct's data as a base, and decrement this
* when they are done. While retain_data is nonzero, this struct's data
* will not be freed even if the delta base cache limit is exceeded.
*/
int retain_data;
/*
* The number of direct children that have not been fully processed
* (entered work_head, entered done_head, left done_head). When this
* number reaches zero, this struct base_data can be freed.
*/
int children_remaining;
/* Not initialized by make_base(). */
struct list_head list;
void *data;
unsigned long size;
};
/*
* Stack of struct base_data that have unprocessed children.
* threaded_second_pass() uses this as a source of work (the other being the
* objects array).
*
* Guarded by work_mutex.
*/
static LIST_HEAD(work_head);
/*
* Stack of struct base_data that have children, all of whom have been
* processed or are being processed, and at least one child is being processed.
* These struct base_data must be kept around until the last child is
* processed.
*
* Guarded by work_mutex.
*/
static LIST_HEAD(done_head);
/*
* All threads share one delta base cache.
*
* base_cache_used is guarded by work_mutex, and base_cache_limit is read-only
* in a thread.
*/
static size_t base_cache_used;
static size_t base_cache_limit;
struct thread_local {
pthread_t thread;
int pack_fd;
};
/* Remember to update object flag allocation in object.h */
#define FLAG_LINK (1u<<20)
#define FLAG_CHECKED (1u<<21)
struct ofs_delta_entry {
off_t offset;
int obj_no;
};
struct ref_delta_entry {
struct object_id oid;
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_MISSING_GITMODULES;
static int verbose;
static const char *progress_title;
static int show_resolving_progress;
static int show_stat;
static int check_self_contained_and_connected;
static struct progress *progress;
/* We always read in 4kB chunks. */
static unsigned char input_buffer[4096];
static unsigned int input_offset, input_len;
static off_t consumed_bytes;
static off_t max_input_size;
static unsigned deepest_delta;
static git_hash_ctx input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd;
static const char *curr_pack;
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_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);
}
/*
* Mutex and conditional variable can't be statically-initialized on Windows.
*/
static void init_thread(void)
{
int i;
init_recursive_mutex(&read_mutex);
pthread_mutex_init(&counter_mutex, NULL);
pthread_mutex_init(&work_mutex, NULL);
if (show_stat)
pthread_mutex_init(&deepest_delta_mutex, NULL);
pthread_key_create(&key, NULL);
CALLOC_ARRAY(thread_data, nr_threads);
for (i = 0; i < nr_threads; i++) {
thread_data[i].pack_fd = xopen(curr_pack, O_RDONLY);
}
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);
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);
}
static int mark_link(struct object *obj, enum object_type type,
void *data, struct fsck_options *options)
{
if (!obj)
return -1;
if (type != OBJ_ANY && obj->type != type)
die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
obj->flags |= FLAG_LINK;
return 0;
}
/* The content of each linked object must have been checked
or it must be already present in the object database */
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 = oid_object_info(the_repository, &obj->oid, &size);
if (type <= 0)
die(_("did not receive expected object %s"),
oid_to_hex(&obj->oid));
if (type != obj->type)
die(_("object %s: expected type %s, found %s"),
oid_to_hex(&obj->oid),
type_name(obj->type), type_name(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();
if (verbose)
progress = start_delayed_progress(_("Checking objects"), max);
for (i = 0; i < max; i++) {
foreign_nr += check_object(get_indexed_object(i));
display_progress(progress, i + 1);
}
stop_progress(&progress);
return foreign_nr;
}
/* Discard current buffer used content. */
static void flush(void)
{
if (input_offset) {
if (output_fd >= 0)
write_or_die(output_fd, input_buffer, input_offset);
the_hash_algo->update_fn(&input_ctx, input_buffer, input_offset);
memmove(input_buffer, input_buffer + input_offset, input_len);
input_offset = 0;
}
}
/*
* Make sure at least "min" bytes are available in the buffer, and
* return the pointer to the buffer.
*/
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;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(consumed_bytes, bytes))
die(_("pack too large for current definition of off_t"));
consumed_bytes += bytes;
if (max_input_size && consumed_bytes > max_input_size) {
struct strbuf size_limit = STRBUF_INIT;
strbuf_humanise_bytes(&size_limit, max_input_size);
die(_("pack exceeds maximum allowed size (%s)"),
size_limit.buf);
}
}
static const char *open_pack_file(const char *pack_name)
{
if (from_stdin) {
input_fd = 0;
if (!pack_name) {
struct strbuf tmp_file = STRBUF_INIT;
output_fd = odb_mkstemp(&tmp_file,
"pack/tmp_pack_XXXXXX");
pack_name = strbuf_detach(&tmp_file, NULL);
} else {
output_fd = xopen(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
}
nothread_data.pack_fd = output_fd;
} else {
input_fd = xopen(pack_name, O_RDONLY);
output_fd = -1;
nothread_data.pack_fd = input_fd;
}
the_hash_algo->init_fn(&input_ctx);
return pack_name;
}
static void parse_pack_header(void)
{
struct pack_header *hdr = fill(sizeof(struct pack_header));
/* Header consistency check */
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));
}
__attribute__((format (printf, 2, 3)))
static NORETURN void bad_object(off_t 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 %"PRIuMAX": %s"),
(uintmax_t)offset, buf);
}
static inline struct thread_local *get_thread_data(void)
{
if (HAVE_THREADS) {
if (threads_active)
return pthread_getspecific(key);
assert(!threads_active &&
"This should only be reached when all threads are gone");
}
return &nothread_data;
}
static void set_thread_data(struct thread_local *data)
{
if (threads_active)
pthread_setspecific(key, data);
}
static void free_base_data(struct base_data *c)
{
if (c->data) {
FREE_AND_NULL(c->data);
base_cache_used -= c->size;
}
}
static void prune_base_data(struct base_data *retain)
{
struct list_head *pos;
if (base_cache_used <= base_cache_limit)
return;
list_for_each_prev(pos, &done_head) {
struct base_data *b = list_entry(pos, struct base_data, list);
if (b->retain_data || b == retain)
continue;
if (b->data) {
free_base_data(b);
if (base_cache_used <= base_cache_limit)
return;
}
}
list_for_each_prev(pos, &work_head) {
struct base_data *b = list_entry(pos, struct base_data, list);
if (b->retain_data || b == retain)
continue;
if (b->data) {
free_base_data(b);
if (base_cache_used <= base_cache_limit)
return;
}
}
}
static int is_delta_type(enum object_type type)
{
return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
}
static void *unpack_entry_data(off_t offset, unsigned long size,
enum object_type type, struct object_id *oid)
{
static char fixed_buf[8192];
int status;
git_zstream stream;
void *buf;
git_hash_ctx c;
char hdr[32];
int hdrlen;
if (!is_delta_type(type)) {
hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX,
type_name(type),(uintmax_t)size) + 1;
the_hash_algo->init_fn(&c);
the_hash_algo->update_fn(&c, hdr, hdrlen);
} else
oid = 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 (oid)
the_hash_algo->update_fn(&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 (oid)
the_hash_algo->final_oid_fn(oid, &c);
return buf == fixed_buf ? NULL : buf;
}
static void *unpack_raw_entry(struct object_entry *obj,
off_t *ofs_offset,
struct object_id *ref_oid,
struct object_id *oid)
{
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:
oidread(ref_oid, fill(the_hash_algo->rawsz));
use(the_hash_algo->rawsz);
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, oid);
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;
off_t 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) ? (int)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) ? (ssize_t)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, %"PRIuMAX" byte missing",
"premature end of pack file, %"PRIuMAX" bytes missing",
(unsigned int)len),
(uintmax_t)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);
/* This has been inflated OK when first encountered, so... */
if (status != Z_STREAM_END || stream.total_out != obj->size)
die(_("serious inflate inconsistency"));
git_inflate_end(&stream);
free(inbuf);
if (consume) {
FREE_AND_NULL(data);
}
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)
{
int first = 0, last = nr_ofs_deltas;
while (first < last) {
int next = first + (last - first) / 2;
struct ofs_delta_entry *delta = &ofs_deltas[next];
int cmp;
cmp = compare_ofs_delta_bases(offset, delta->offset,
OBJ_OFS_DELTA,
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)
{
int first = find_ofs_delta(offset);
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 struct object_id *oid1,
const struct object_id *oid2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return oidcmp(oid1, oid2);
}
static int find_ref_delta(const struct object_id *oid)
{
int first = 0, last = nr_ref_deltas;
while (first < last) {
int next = first + (last - first) / 2;
struct ref_delta_entry *delta = &ref_deltas[next];
int cmp;
cmp = compare_ref_delta_bases(oid, &delta->oid,
OBJ_REF_DELTA,
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 struct object_id *oid,
int *first_index, int *last_index)
{
int first = find_ref_delta(oid);
int last = first;
int end = nr_ref_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && oideq(&ref_deltas[first - 1].oid, oid))
--first;
while (last < end && oideq(&ref_deltas[last + 1].oid, oid))
++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 !"),
oid_to_hex(&data->entry->idx.oid));
if (len < 0)
die(_("unable to read %s"),
oid_to_hex(&data->entry->idx.oid));
if (memcmp(buf, data->buf, len))
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&data->entry->idx.oid));
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(the_repository, &entry->idx.oid, &type, &size,
NULL);
if (!data.st)
return -1;
if (size != entry->size || type != entry->type)
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&entry->idx.oid));
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 struct object_id *oid)
{
void *new_data = NULL;
int collision_test_needed = 0;
assert(data || obj_entry);
if (startup_info->have_repository) {
read_lock();
collision_test_needed =
has_object_file_with_flags(oid, OBJECT_INFO_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 = oid_object_info(the_repository, oid, &has_size);
if (has_type < 0)
die(_("cannot read existing object info %s"), oid_to_hex(oid));
if (has_type != type || has_size != size)
die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
has_data = read_object_file(oid, &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"), oid_to_hex(oid));
if (size != has_size || type != has_type ||
memcmp(data, has_data, size) != 0)
die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
free(has_data);
}
if (strict || do_fsck_object) {
read_lock();
if (type == OBJ_BLOB) {
struct blob *blob = lookup_blob(the_repository, oid);
if (blob)
blob->object.flags |= FLAG_CHECKED;
else
die(_("invalid blob object %s"), oid_to_hex(oid));
if (do_fsck_object &&
fsck_object(&blob->object, (void *)data, size, &fsck_options))
die(_("fsck error in packed object"));
} else {
struct object *obj;
int eaten;
void *buf = (void *) data;
assert(data && "data can only be NULL for large _blobs_");
/*
* we do not need to free the memory here, as the
* buf is deleted by the caller.
*/
obj = parse_object_buffer(the_repository, oid, type,
size, buf,
&eaten);
if (!obj)
die(_("invalid %s"), type_name(type));
if (do_fsck_object &&
fsck_object(obj, buf, size, &fsck_options))
die(_("fsck error in packed object"));
if (strict && fsck_walk(obj, NULL, &fsck_options))
die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
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)
BUG("parse_object_buffer transmogrified our buffer");
}
obj->flags |= FLAG_CHECKED;
}
read_unlock();
}
free(new_data);
}
/*
* Ensure that this node has been reconstructed and return its contents.
*
* In the typical and best case, this node would already be reconstructed
* (through the invocation to resolve_delta() in threaded_second_pass()) and it
* would not be pruned. However, if pruning of this node was necessary due to
* reaching delta_base_cache_limit, this function will find the closest
* ancestor with reconstructed data that has not been pruned (or if there is
* none, the ultimate base object), and reconstruct each node in the delta
* chain in order to generate the reconstructed data for this node.
*/
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;
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"));
base_cache_used += c->size;
prune_base_data(c);
}
free(delta);
}
return c->data;
}
static struct base_data *make_base(struct object_entry *obj,
struct base_data *parent)
{
struct base_data *base = xcalloc(1, sizeof(struct base_data));
base->base = parent;
base->obj = obj;
find_ref_delta_children(&obj->idx.oid,
&base->ref_first, &base->ref_last);
find_ofs_delta_children(obj->idx.offset,
&base->ofs_first, &base->ofs_last);
base->children_remaining = base->ref_last - base->ref_first +
base->ofs_last - base->ofs_first + 2;
return base;
}
static struct base_data *resolve_delta(struct object_entry *delta_obj,
struct base_data *base)
{
void *delta_data, *result_data;
struct base_data *result;
unsigned long result_size;
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);
assert(base->data);
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_object_file(the_hash_algo, result_data, result_size,
type_name(delta_obj->real_type), &delta_obj->idx.oid);
sha1_object(result_data, NULL, result_size, delta_obj->real_type,
&delta_obj->idx.oid);
result = make_base(delta_obj, base);
result->data = result_data;
result->size = result_size;
counter_lock();
nr_resolved_deltas++;
counter_unlock();
return result;
}
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 oidcmp(&delta_a->oid, &delta_b->oid);
}
static void *threaded_second_pass(void *data)
{
if (data)
set_thread_data(data);
for (;;) {
struct base_data *parent = NULL;
struct object_entry *child_obj;
struct base_data *child;
counter_lock();
display_progress(progress, nr_resolved_deltas);
counter_unlock();
work_lock();
if (list_empty(&work_head)) {
/*
* Take an object from the object array.
*/
while (nr_dispatched < nr_objects &&
is_delta_type(objects[nr_dispatched].type))
nr_dispatched++;
if (nr_dispatched >= nr_objects) {
work_unlock();
break;
}
child_obj = &objects[nr_dispatched++];
} else {
/*
* Peek at the top of the stack, and take a child from
* it.
*/
parent = list_first_entry(&work_head, struct base_data,
list);
if (parent->ref_first <= parent->ref_last) {
int offset = ref_deltas[parent->ref_first++].obj_no;
child_obj = objects + offset;
if (child_obj->real_type != OBJ_REF_DELTA)
die("REF_DELTA at offset %"PRIuMAX" already resolved (duplicate base %s?)",
(uintmax_t) child_obj->idx.offset,
oid_to_hex(&parent->obj->idx.oid));
child_obj->real_type = parent->obj->real_type;
} else {
child_obj = objects +
ofs_deltas[parent->ofs_first++].obj_no;
assert(child_obj->real_type == OBJ_OFS_DELTA);
child_obj->real_type = parent->obj->real_type;
}
if (parent->ref_first > parent->ref_last &&
parent->ofs_first > parent->ofs_last) {
/*
* This parent has run out of children, so move
* it to done_head.
*/
list_del(&parent->list);
list_add(&parent->list, &done_head);
}
/*
* Ensure that the parent has data, since we will need
* it later.
*
* NEEDSWORK: If parent data needs to be reloaded, this
* prolongs the time that the current thread spends in
* the mutex. A mitigating factor is that parent data
* needs to be reloaded only if the delta base cache
* limit is exceeded, so in the typical case, this does
* not happen.
*/
get_base_data(parent);
parent->retain_data++;
}
work_unlock();
if (parent) {
child = resolve_delta(child_obj, parent);
if (!child->children_remaining)
FREE_AND_NULL(child->data);
} else {
child = make_base(child_obj, NULL);
if (child->children_remaining) {
/*
* Since this child has its own delta children,
* we will need this data in the future.
* Inflate now so that future iterations will
* have access to this object's data while
* outside the work mutex.
*/
child->data = get_data_from_pack(child_obj);
child->size = child_obj->size;
}
}
work_lock();
if (parent)
parent->retain_data--;
if (child->data) {
/*
* This child has its own children, so add it to
* work_head.
*/
list_add(&child->list, &work_head);
base_cache_used += child->size;
prune_base_data(NULL);
} else {
/*
* This child does not have its own children. It may be
* the last descendant of its ancestors; free those
* that we can.
*/
struct base_data *p = parent;
while (p) {
struct base_data *next_p;
p->children_remaining--;
if (p->children_remaining)
break;
next_p = p->base;
free_base_data(p);
list_del(&p->list);
free(p);
p = next_p;
}
}
work_unlock();
}
return NULL;
}
/*
* First pass:
* - find locations of all objects;
* - calculate SHA1 of all non-delta objects;
* - remember base (SHA1 or offset) for all deltas.
*/
static void parse_pack_objects(unsigned char *hash)
{
int i, nr_delays = 0;
struct ofs_delta_entry *ofs_delta = ofs_deltas;
struct object_id ref_delta_oid;
struct stat st;
if (verbose)
progress = start_progress(
progress_title ? progress_title :
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_oid,
&obj->idx.oid);
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);
oidcpy(&ref_deltas[nr_ref_deltas].oid, &ref_delta_oid);
ref_deltas[nr_ref_deltas].obj_no = i;
nr_ref_deltas++;
} else if (!data) {
/* large blobs, check later */
obj->real_type = OBJ_BAD;
nr_delays++;
} else
sha1_object(data, NULL, obj->size, obj->type,
&obj->idx.oid);
free(data);
display_progress(progress, i+1);
}
objects[i].idx.offset = consumed_bytes;
stop_progress(&progress);
/* Check pack integrity */
flush();
the_hash_algo->final_fn(hash, &input_ctx);
if (!hasheq(fill(the_hash_algo->rawsz), hash))
die(_("pack is corrupted (SHA1 mismatch)"));
use(the_hash_algo->rawsz);
/* If input_fd is a file, we should have reached its end now. */
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.oid);
nr_delays--;
}
if (nr_delays)
die(_("confusion beyond insanity in parse_pack_objects()"));
}
/*
* Second pass:
* - for all non-delta objects, look if it is used as a base for
* deltas;
* - if used as a base, uncompress the object and apply all deltas,
* recursively checking if the resulting object is used as a base
* for some more deltas.
*/
static void resolve_deltas(void)
{
int i;
if (!nr_ofs_deltas && !nr_ref_deltas)
return;
/* Sort deltas by base SHA1/offset for fast searching */
QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
if (verbose || show_resolving_progress)
progress = start_progress(_("Resolving deltas"),
nr_ref_deltas + nr_ofs_deltas);
nr_dispatched = 0;
base_cache_limit = delta_base_cache_limit * nr_threads;
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;
}
threaded_second_pass(&nothread_data);
}
/*
* Third pass:
* - append objects to convert thin pack to full pack if required
* - write the final pack hash
*/
static void fix_unresolved_deltas(struct hashfile *f);
static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_hash)
{
if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
stop_progress(&progress);
/* Flush remaining pack final hash. */
flush();
return;
}
if (fix_thin_pack) {
struct hashfile *f;
unsigned char read_hash[GIT_MAX_RAWSZ], tail_hash[GIT_MAX_RAWSZ];
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 = hashfd(output_fd, curr_pack);
fix_unresolved_deltas(f);
strbuf_addf(&msg, Q_("completed with %d local object",
"completed with %d local objects",
nr_objects - nr_objects_initial),
nr_objects - nr_objects_initial);
stop_progress_msg(&progress, msg.buf);
strbuf_release(&msg);
finalize_hashfile(f, tail_hash, FSYNC_COMPONENT_PACK, 0);
hashcpy(read_hash, pack_hash);
fixup_pack_header_footer(output_fd, pack_hash,
curr_pack, nr_objects,
read_hash, consumed_bytes-the_hash_algo->rawsz);
if (!hasheq(read_hash, tail_hash))
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 hashfile *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);
hashwrite(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 hashfile *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);
hashwrite(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);
hashflush(f);
oidread(&obj->idx.oid, 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 hashfile *f)
{
struct ref_delta_entry **sorted_by_pos;
int i;
/*
* Since many unresolved deltas may well be themselves base objects
* for more unresolved deltas, we really want to include the
* smallest number of base objects that would cover as much delta
* as possible by picking the
* trunc deltas first, allowing for other deltas to resolve without
* additional base objects. Since most base objects are to be found
* before deltas depending on them, a good heuristic is to start
* resolving deltas in the same order as their position in the pack.
*/
ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
for (i = 0; i < nr_ref_deltas; i++)
sorted_by_pos[i] = &ref_deltas[i];
QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
if (has_promisor_remote()) {
/*
* Prefetch the delta bases.
*/
struct oid_array to_fetch = OID_ARRAY_INIT;
for (i = 0; i < nr_ref_deltas; i++) {
struct ref_delta_entry *d = sorted_by_pos[i];
if (!oid_object_info_extended(the_repository, &d->oid,
NULL,
OBJECT_INFO_FOR_PREFETCH))
continue;
oid_array_append(&to_fetch, &d->oid);
}
promisor_remote_get_direct(the_repository,
to_fetch.oid, to_fetch.nr);
oid_array_clear(&to_fetch);
}
for (i = 0; i < nr_ref_deltas; i++) {
struct ref_delta_entry *d = sorted_by_pos[i];
enum object_type type;
void *data;
unsigned long size;
if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
continue;
data = read_object_file(&d->oid, &type, &size);
if (!data)
continue;
if (check_object_signature(the_repository, &d->oid,
data, size,
type_name(type), NULL))
die(_("local object %s is corrupt"), oid_to_hex(&d->oid));
/*
* Add this as an object to the objects array and call
* threaded_second_pass() (which will pick up the added
* object).
*/
append_obj_to_pack(f, d->oid.hash, data, size, type);
threaded_second_pass(NULL);
display_progress(progress, nr_resolved_deltas);
}
free(sorted_by_pos);
}
static const char *derive_filename(const char *pack_name, const char *strip,
const char *suffix, struct strbuf *buf)
{
size_t len;
if (!strip_suffix(pack_name, strip, &len) || !len ||
pack_name[len - 1] != '.')
die(_("packfile name '%s' does not end with '.%s'"),
pack_name, strip);
strbuf_add(buf, pack_name, len);
strbuf_addstr(buf, suffix);
return buf->buf;
}
static void write_special_file(const char *suffix, const char *msg,
const char *pack_name, const unsigned char *hash,
const char **report)
{
struct strbuf name_buf = STRBUF_INIT;
const char *filename;
int fd;
int msg_len = strlen(msg);
if (pack_name)
filename = derive_filename(pack_name, "pack", suffix, &name_buf);
else
filename = odb_pack_name(&name_buf, hash, suffix);
fd = odb_pack_keep(filename);
if (fd < 0) {
if (errno != EEXIST)
die_errno(_("cannot write %s file '%s'"),
suffix, filename);
} else {
if (msg_len > 0) {
write_or_die(fd, msg, msg_len);
write_or_die(fd, "\n", 1);
}
if (close(fd) != 0)
die_errno(_("cannot close written %s file '%s'"),
suffix, filename);
if (report)
*report = suffix;
}
strbuf_release(&name_buf);
}
static void rename_tmp_packfile(const char **final_name,
const char *curr_name,
struct strbuf *name, unsigned char *hash,
const char *ext, int make_read_only_if_same)
{
if (*final_name != curr_name) {
if (!*final_name)
*final_name = odb_pack_name(name, hash, ext);
if (finalize_object_file(curr_name, *final_name))
die(_("unable to rename temporary '*.%s' file to '%s'"),
ext, *final_name);
} else if (make_read_only_if_same) {
chmod(*final_name, 0444);
}
}
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 *final_rev_index_name, const char *curr_rev_index_name,
const char *keep_msg, const char *promisor_msg,
unsigned char *hash)
{
const char *report = "pack";
struct strbuf pack_name = STRBUF_INIT;
struct strbuf index_name = STRBUF_INIT;
struct strbuf rev_index_name = STRBUF_INIT;
int err;
if (!from_stdin) {
close(input_fd);
} else {
fsync_component_or_die(FSYNC_COMPONENT_PACK, output_fd, curr_pack_name);
err = close(output_fd);
if (err)
die_errno(_("error while closing pack file"));
}
if (keep_msg)
write_special_file("keep", keep_msg, final_pack_name, hash,
&report);
if (promisor_msg)
write_special_file("promisor", promisor_msg, final_pack_name,
hash, NULL);
rename_tmp_packfile(&final_pack_name, curr_pack_name, &pack_name,
hash, "pack", from_stdin);
if (curr_rev_index_name)
rename_tmp_packfile(&final_rev_index_name, curr_rev_index_name,
&rev_index_name, hash, "rev", 1);
rename_tmp_packfile(&final_index_name, curr_index_name, &index_name,
hash, "idx", 1);
if (do_fsck_object) {
struct packed_git *p;
p = add_packed_git(final_index_name, strlen(final_index_name), 0);
if (p)
install_packed_git(the_repository, p);
}
if (!from_stdin) {
printf("%s\n", hash_to_hex(hash));
} else {
struct strbuf buf = STRBUF_INIT;
strbuf_addf(&buf, "%s\t%s\n", report, hash_to_hex(hash));
write_or_die(1, buf.buf, buf.len);
strbuf_release(&buf);
/*
* Let's just mimic git-unpack-objects here and write
* the last part of the input buffer to stdout.
*/
while (input_len) {
err = xwrite(1, input_buffer + input_offset, input_len);
if (err <= 0)
break;
input_len -= err;
input_offset += err;
}
}
strbuf_release(&rev_index_name);
strbuf_release(&index_name);
strbuf_release(&pack_name);
}
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);
if (!HAVE_THREADS && nr_threads != 1) {
warning(_("no threads support, ignoring %s"), k);
nr_threads = 1;
}
return 0;
}
if (!strcmp(k, "pack.writereverseindex")) {
if (git_config_bool(k, v))
opts->flags |= WRITE_REV;
else
opts->flags &= ~WRITE_REV;
}
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;
/* The address of the 4-byte offset table */
idx1 = (((const uint32_t *)((const uint8_t *)p->index_data + p->crc_offset))
+ (size_t)p->num_objects /* CRC32 table */
);
/* The address of the 8-byte offset table */
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;
check_pack_index_ptr(p, &idx2[off * 2]);
if (idx2[off * 2])
continue;
/*
* The real offset is ntohl(idx2[off * 2]) in high 4
* octets, and ntohl(idx2[off * 2 + 1]) in low 4
* octets. But idx2[off * 2] is Zero!!!
*/
ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
}
QSORT(opts->anomaly, opts->anomaly_nr, 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);
/* Read the attributes from the existing idx file */
opts->version = p->index_version;
if (opts->version == 2)
read_v2_anomalous_offsets(p, opts);
/*
* Get rid of the idx file as we do not need it anymore.
* NEEDSWORK: extract this bit from free_pack_by_name() in
* object-file.c, perhaps? It shouldn't matter very much as we
* know we haven't installed this pack (hence we never have
* read anything from it).
*/
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)
CALLOC_ARRAY(chain_histogram, deepest_delta);
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 %"PRIuMAX" %"PRIuMAX" %"PRIuMAX,
oid_to_hex(&obj->idx.oid),
type_name(obj->real_type), (uintmax_t)obj->size,
(uintmax_t)(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,
oid_to_hex(&bobj->idx.oid));
}
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, rev_index;
const char *curr_index;
const char *curr_rev_index = NULL;
const char *index_name = NULL, *pack_name = NULL, *rev_index_name = NULL;
const char *keep_msg = NULL;
const char *promisor_msg = NULL;
struct strbuf index_name_buf = STRBUF_INIT;
struct strbuf rev_index_name_buf = STRBUF_INIT;
struct pack_idx_entry **idx_objects;
struct pack_idx_option opts;
unsigned char pack_hash[GIT_MAX_RAWSZ];
unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
int report_end_of_input = 0;
int hash_algo = 0;
/*
* index-pack never needs to fetch missing objects except when
* REF_DELTA bases are missing (which are explicitly handled). It only
* accesses the repo to do hash collision checks and to check which
* REF_DELTA bases need to be fetched.
*/
fetch_if_missing = 0;
if (argc == 2 && !strcmp(argv[1], "-h"))
usage(index_pack_usage);
read_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"));
if (git_env_bool(GIT_TEST_WRITE_REV_INDEX, 0))
rev_index = 1;
else
rev_index = !!(opts.flags & (WRITE_REV_VERIFY | WRITE_REV));
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 (skip_to_optional_arg(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, "--fsck-objects")) {
do_fsck_object = 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 (skip_to_optional_arg(arg, "--keep", &keep_msg)) {
; /* nothing to do */
} else if (skip_to_optional_arg(arg, "--promisor", &promisor_msg)) {
; /* already parsed */
} 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);
if (!HAVE_THREADS && nr_threads != 1) {
warning(_("no threads support, ignoring %s"), arg);
nr_threads = 1;
}
} 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, "--progress-title")) {
if (progress_title || (i+1) >= argc)
usage(index_pack_usage);
progress_title = argv[++i];
} else if (!strcmp(arg, "--show-resolving-progress")) {
show_resolving_progress = 1;
} else if (!strcmp(arg, "--report-end-of-input")) {
report_end_of_input = 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 if (skip_prefix(arg, "--max-input-size=", &arg)) {
max_input_size = strtoumax(arg, NULL, 10);
} else if (skip_prefix(arg, "--object-format=", &arg)) {
hash_algo = hash_algo_by_name(arg);
if (hash_algo == GIT_HASH_UNKNOWN)
die(_("unknown hash algorithm '%s'"), arg);
repo_set_hash_algo(the_repository, hash_algo);
} else if (!strcmp(arg, "--rev-index")) {
rev_index = 1;
} else if (!strcmp(arg, "--no-rev-index")) {
rev_index = 0;
} 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(_("the option '%s' requires '%s'"), "--fix-thin", "--stdin");
if (from_stdin && !startup_info->have_repository)
die(_("--stdin requires a git repository"));
if (from_stdin && hash_algo)
die(_("options '%s' and '%s' cannot be used together"), "--object-format", "--stdin");
if (!index_name && pack_name)
index_name = derive_filename(pack_name, "pack", "idx", &index_name_buf);
opts.flags &= ~(WRITE_REV | WRITE_REV_VERIFY);
if (rev_index) {
opts.flags |= verify ? WRITE_REV_VERIFY : WRITE_REV;
if (index_name)
rev_index_name = derive_filename(index_name,
"idx", "rev",
&rev_index_name_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;
if (HAVE_THREADS && !nr_threads) {
nr_threads = online_cpus();
/*
* Experiments show that going above 20 threads doesn't help,
* no matter how many cores you have. Below that, we tend to
* max at half the number of online_cpus(), presumably because
* half of those are hyperthreads rather than full cores. We'll
* never reduce the level below "3", though, to match a
* historical value that nobody complained about.
*/
if (nr_threads < 4)
; /* too few cores to consider capping */
else if (nr_threads < 6)
nr_threads = 3; /* historic cap */
else if (nr_threads < 40)
nr_threads /= 2;
else
nr_threads = 20; /* hard cap */
}
curr_pack = open_pack_file(pack_name);
parse_pack_header();
CALLOC_ARRAY(objects, st_add(nr_objects, 1));
if (show_stat)
CALLOC_ARRAY(obj_stat, st_add(nr_objects, 1));
CALLOC_ARRAY(ofs_deltas, nr_objects);
parse_pack_objects(pack_hash);
if (report_end_of_input)
write_in_full(2, "\0", 1);
resolve_deltas();
conclude_pack(fix_thin_pack, curr_pack, pack_hash);
free(ofs_deltas);
free(ref_deltas);
if (strict)
foreign_nr = check_objects();
if (show_stat)
show_pack_info(stat_only);
ALLOC_ARRAY(idx_objects, nr_objects);
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_hash);
if (rev_index)
curr_rev_index = write_rev_file(rev_index_name, idx_objects,
nr_objects, pack_hash,
opts.flags);
free(idx_objects);
if (!verify)
final(pack_name, curr_pack,
index_name, curr_index,
rev_index_name, curr_rev_index,
keep_msg, promisor_msg,
pack_hash);
else
close(input_fd);
if (do_fsck_object && fsck_finish(&fsck_options))
die(_("fsck error in pack objects"));
free(objects);
strbuf_release(&index_name_buf);
strbuf_release(&rev_index_name_buf);
if (pack_name == NULL)
free((void *) curr_pack);
if (index_name == NULL)
free((void *) curr_index);
if (rev_index_name == NULL)
free((void *) curr_rev_index);
/*
* Let the caller know this pack is not self contained
*/
if (check_self_contained_and_connected && foreign_nr)
return 1;
return 0;
}