git/builtin/index-pack.c
Junio C Hamano 68be2fea50 receive-pack, fetch-pack: reject bogus pack that records objects twice
When receive-pack & fetch-pack are run and store the pack obtained over
the wire to a local repository, they internally run the index-pack command
with the --strict option. Make sure that we reject incoming packfile that
records objects twice to avoid spreading such a damage.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-11-16 22:05:21 -08:00

1199 lines
31 KiB
C

#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"
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 int hdr_size;
enum object_type type;
enum object_type real_type;
unsigned delta_depth;
int base_object_no;
};
union delta_base {
unsigned char sha1[20];
off_t offset;
};
struct base_data {
struct base_data *base;
struct base_data *child;
struct object_entry *obj;
void *data;
unsigned long size;
};
/*
* Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
* to memcmp() only the first 20 bytes.
*/
#define UNION_BASE_SZ 20
#define FLAG_LINK (1u<<20)
#define FLAG_CHECKED (1u<<21)
struct delta_entry {
union delta_base base;
int obj_no;
};
static struct object_entry *objects;
static struct delta_entry *deltas;
static struct base_data *base_cache;
static size_t base_cache_used;
static int nr_objects;
static int nr_deltas;
static int nr_resolved_deltas;
static int from_stdin;
static int strict;
static int verbose;
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 unsigned deepest_delta;
static git_SHA_CTX input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd, pack_fd;
static int mark_link(struct object *obj, int type, void *data)
{
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;
}
/* The content of each linked object must have been checked
or it must be already present in the object database */
static void check_object(struct object *obj)
{
if (!obj)
return;
if (!(obj->flags & FLAG_LINK))
return;
if (!(obj->flags & FLAG_CHECKED)) {
unsigned long size;
int type = sha1_object_info(obj->sha1, &size);
if (type != obj->type || type <= 0)
die("object of unexpected type");
obj->flags |= FLAG_CHECKED;
return;
}
}
static void check_objects(void)
{
unsigned i, max;
max = get_max_object_index();
for (i = 0; i < max; i++)
check_object(get_indexed_object(i));
}
/* 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);
git_SHA1_Update(&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("cannot fill %d bytes", 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;
}
static const char *open_pack_file(const char *pack_name)
{
if (from_stdin) {
input_fd = 0;
if (!pack_name) {
static char tmpfile[PATH_MAX];
output_fd = odb_mkstemp(tmpfile, sizeof(tmpfile),
"pack/tmp_pack_XXXXXX");
pack_name = xstrdup(tmpfile);
} 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);
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;
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));
/* 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));
}
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 void free_base_data(struct base_data *c)
{
if (c->data) {
free(c->data);
c->data = NULL;
base_cache_used -= c->size;
}
}
static void prune_base_data(struct base_data *retain)
{
struct base_data *b;
for (b = base_cache;
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
base_cache = c;
c->base = base;
c->child = NULL;
if (c->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
base_cache = NULL;
free_base_data(c);
}
static void *unpack_entry_data(unsigned long offset, unsigned long size)
{
int status;
git_zstream stream;
void *buf = xmalloc(size);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = buf;
stream.avail_out = size;
do {
stream.next_in = fill(1);
stream.avail_in = input_len;
status = git_inflate(&stream, 0);
use(input_len - stream.avail_in);
} while (status == Z_OK);
if (stream.total_out != size || status != Z_STREAM_END)
bad_object(offset, "inflate returned %d", status);
git_inflate_end(&stream);
return buf;
}
static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
{
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(delta_base->sha1, fill(20));
use(20);
break;
case OBJ_OFS_DELTA:
memset(delta_base, 0, sizeof(*delta_base));
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);
}
delta_base->offset = obj->idx.offset - base_offset;
if (delta_base->offset <= 0 || delta_base->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->idx.crc32 = input_crc32;
return data;
}
static void *get_data_from_pack(struct object_entry *obj)
{
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 = xmalloc(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 = obj->size;
do {
ssize_t n = (len < 64*1024) ? len : 64*1024;
n = pread(pack_fd, inbuf, n, from);
if (n < 0)
die_errno("cannot pread pack file");
if (!n)
die("premature end of pack file, %lu bytes missing", len);
from += n;
len -= n;
stream.next_in = inbuf;
stream.avail_in = n;
status = git_inflate(&stream, 0);
} 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);
return data;
}
static int compare_delta_bases(const union delta_base *base1,
const union delta_base *base2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return memcmp(base1, base2, UNION_BASE_SZ);
}
static int find_delta(const union delta_base *base, enum object_type type)
{
int first = 0, last = nr_deltas;
while (first < last) {
int next = (first + last) / 2;
struct delta_entry *delta = &deltas[next];
int cmp;
cmp = compare_delta_bases(base, &delta->base,
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_delta_children(const union delta_base *base,
int *first_index, int *last_index,
enum object_type type)
{
int first = find_delta(base, type);
int last = first;
int end = nr_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
--first;
while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
++last;
*first_index = first;
*last_index = last;
}
static void sha1_object(const void *data, unsigned long size,
enum object_type type, unsigned char *sha1)
{
hash_sha1_file(data, size, typename(type), sha1);
if (has_sha1_file(sha1)) {
void *has_data;
enum object_type has_type;
unsigned long has_size;
has_data = read_sha1_file(sha1, &has_type, &has_size);
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) {
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;
/*
* we do not need to free the memory here, as the
* buf is deleted by the caller.
*/
obj = parse_object_buffer(sha1, type, size, buf, &eaten);
if (!obj)
die("invalid %s", typename(type));
if (fsck_object(obj, 1, fsck_error_function))
die("Error in object");
if (fsck_walk(obj, mark_link, NULL))
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;
}
if (obj->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *) obj;
commit->buffer = NULL;
}
obj->flags |= FLAG_CHECKED;
}
}
}
static int is_delta_type(enum object_type type)
{
return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
}
static void *get_base_data(struct base_data *c)
{
if (!c->data) {
struct object_entry *obj = c->obj;
if (is_delta_type(obj->type)) {
void *base = get_base_data(c->base);
void *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");
} else {
c->data = get_data_from_pack(obj);
c->size = obj->size;
}
base_cache_used += c->size;
prune_base_data(c);
}
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;
delta_obj->real_type = base->obj->real_type;
delta_obj->delta_depth = base->obj->delta_depth + 1;
if (deepest_delta < delta_obj->delta_depth)
deepest_delta = delta_obj->delta_depth;
delta_obj->base_object_no = base->obj - objects;
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");
sha1_object(result->data, result->size, delta_obj->real_type,
delta_obj->idx.sha1);
nr_resolved_deltas++;
}
static void find_unresolved_deltas(struct base_data *base,
struct base_data *prev_base)
{
int i, ref_first, ref_last, ofs_first, ofs_last;
/*
* This is a recursive function. Those brackets should help reducing
* stack usage by limiting the scope of the delta_base union.
*/
{
union delta_base base_spec;
hashcpy(base_spec.sha1, base->obj->idx.sha1);
find_delta_children(&base_spec,
&ref_first, &ref_last, OBJ_REF_DELTA);
memset(&base_spec, 0, sizeof(base_spec));
base_spec.offset = base->obj->idx.offset;
find_delta_children(&base_spec,
&ofs_first, &ofs_last, OBJ_OFS_DELTA);
}
if (ref_last == -1 && ofs_last == -1) {
free(base->data);
return;
}
link_base_data(prev_base, base);
for (i = ref_first; i <= ref_last; i++) {
struct object_entry *child = objects + deltas[i].obj_no;
struct base_data result;
assert(child->real_type == OBJ_REF_DELTA);
resolve_delta(child, base, &result);
if (i == ref_last && ofs_last == -1)
free_base_data(base);
find_unresolved_deltas(&result, base);
}
for (i = ofs_first; i <= ofs_last; i++) {
struct object_entry *child = objects + deltas[i].obj_no;
struct base_data result;
assert(child->real_type == OBJ_OFS_DELTA);
resolve_delta(child, base, &result);
if (i == ofs_last)
free_base_data(base);
find_unresolved_deltas(&result, base);
}
unlink_base_data(base);
}
static int compare_delta_entry(const void *a, const void *b)
{
const struct delta_entry *delta_a = a;
const struct delta_entry *delta_b = b;
/* group by type (ref vs ofs) and then by value (sha-1 or offset) */
return compare_delta_bases(&delta_a->base, &delta_b->base,
objects[delta_a->obj_no].type,
objects[delta_b->obj_no].type);
}
/* Parse all objects and return the pack content SHA1 hash */
static void parse_pack_objects(unsigned char *sha1)
{
int i;
struct delta_entry *delta = deltas;
struct stat st;
/*
* First pass:
* - find locations of all objects;
* - calculate SHA1 of all non-delta objects;
* - remember base (SHA1 or offset) for all deltas.
*/
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, &delta->base);
obj->real_type = obj->type;
if (is_delta_type(obj->type)) {
nr_deltas++;
delta->obj_no = i;
delta++;
} else
sha1_object(data, obj->size, obj->type, obj->idx.sha1);
free(data);
display_progress(progress, i+1);
}
objects[i].idx.offset = consumed_bytes;
stop_progress(&progress);
/* Check pack integrity */
flush();
git_SHA1_Final(sha1, &input_ctx);
if (hashcmp(fill(20), sha1))
die("pack is corrupted (SHA1 mismatch)");
use(20);
/* 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");
if (!nr_deltas)
return;
/* Sort deltas by base SHA1/offset for fast searching */
qsort(deltas, nr_deltas, sizeof(struct delta_entry),
compare_delta_entry);
/*
* 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.
*/
if (verbose)
progress = start_progress("Resolving deltas", nr_deltas);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
struct base_data base_obj;
if (is_delta_type(obj->type))
continue;
base_obj.obj = obj;
base_obj.data = NULL;
find_unresolved_deltas(&base_obj, NULL);
display_progress(progress, nr_resolved_deltas);
}
}
static int write_compressed(struct sha1file *f, void *in, unsigned int size)
{
git_zstream stream;
int status;
unsigned char outbuf[4096];
memset(&stream, 0, sizeof(stream));
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 delta_entry *a = *(struct delta_entry **)_a;
struct delta_entry *b = *(struct delta_entry **)_b;
return a->obj_no - b->obj_no;
}
static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
{
struct delta_entry **sorted_by_pos;
int i, n = 0;
/*
* 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.
*/
sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
for (i = 0; i < nr_deltas; i++) {
if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
continue;
sorted_by_pos[n++] = &deltas[i];
}
qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
for (i = 0; i < n; i++) {
struct delta_entry *d = sorted_by_pos[i];
enum object_type type;
struct base_data base_obj;
if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
continue;
base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
if (!base_obj.data)
continue;
if (check_sha1_signature(d->base.sha1, base_obj.data,
base_obj.size, typename(type)))
die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
base_obj.obj = append_obj_to_pack(f, d->base.sha1,
base_obj.data, base_obj.size, type);
find_unresolved_deltas(&base_obj, NULL);
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);
} 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);
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 (move_temp_to_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 (move_temp_to_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);
/*
* 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;
}
}
}
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;
}
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 *)p->index_data)
+ 2 /* 8-byte header */
+ 256 /* fan out */
+ 5 * p->num_objects /* 20-byte SHA-1 table */
+ 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;
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]);
}
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);
/* 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
* sha1_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_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->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->base_object_no];
printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
}
putchar('\n');
}
if (baseobjects)
printf("non delta: %d object%s\n",
baseobjects, baseobjects > 1 ? "s" : "");
for (i = 0; i < deepest_delta; i++) {
if (!chain_histogram[i])
continue;
printf("chain length = %d: %lu object%s\n",
i + 1,
chain_histogram[i],
chain_histogram[i] > 1 ? "s" : "");
}
}
int cmd_index_pack(int argc, const char **argv, const char *prefix)
{
int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
const char *curr_pack, *curr_index;
const char *index_name = NULL, *pack_name = NULL;
const char *keep_name = NULL, *keep_msg = NULL;
char *index_name_buf = NULL, *keep_name_buf = NULL;
struct pack_idx_entry **idx_objects;
struct pack_idx_option opts;
unsigned char pack_sha1[20];
if (argc == 2 && !strcmp(argv[1], "-h"))
usage(index_pack_usage);
read_replace_refs = 0;
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;
} else if (!strcmp(arg, "--verify")) {
verify = 1;
} else if (!strcmp(arg, "--verify-stat")) {
verify = 1;
stat = 1;
} else if (!strcmp(arg, "--verify-stat-only")) {
verify = 1;
stat = 1;
stat_only = 1;
} else if (!strcmp(arg, "--keep")) {
keep_msg = "";
} else if (!prefixcmp(arg, "--keep=")) {
keep_msg = arg + 7;
} else if (!prefixcmp(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 (!prefixcmp(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) {
int len = strlen(pack_name);
if (!has_extension(pack_name, ".pack"))
die("packfile name '%s' does not end with '.pack'",
pack_name);
index_name_buf = xmalloc(len);
memcpy(index_name_buf, pack_name, len - 5);
strcpy(index_name_buf + len - 5, ".idx");
index_name = index_name_buf;
}
if (keep_msg && !keep_name && pack_name) {
int len = strlen(pack_name);
if (!has_extension(pack_name, ".pack"))
die("packfile name '%s' does not end with '.pack'",
pack_name);
keep_name_buf = xmalloc(len);
memcpy(keep_name_buf, pack_name, len - 5);
strcpy(keep_name_buf + len - 5, ".keep");
keep_name = keep_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;
curr_pack = open_pack_file(pack_name);
parse_pack_header();
objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
parse_pack_objects(pack_sha1);
if (nr_deltas == nr_resolved_deltas) {
stop_progress(&progress);
/* Flush remaining pack final 20-byte SHA1. */
flush();
} else {
if (fix_thin_pack) {
struct sha1file *f;
unsigned char read_sha1[20], tail_sha1[20];
char msg[48];
int nr_unresolved = nr_deltas - nr_resolved_deltas;
int nr_objects_initial = nr_objects;
if (nr_unresolved <= 0)
die("confusion beyond insanity");
objects = xrealloc(objects,
(nr_objects + nr_unresolved + 1)
* sizeof(*objects));
f = sha1fd(output_fd, curr_pack);
fix_unresolved_deltas(f, nr_unresolved);
sprintf(msg, "completed with %d local objects",
nr_objects - nr_objects_initial);
stop_progress_msg(&progress, 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_deltas != nr_resolved_deltas)
die("pack has %d unresolved deltas",
nr_deltas - nr_resolved_deltas);
}
free(deltas);
if (strict)
check_objects();
if (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);
free(index_name_buf);
free(keep_name_buf);
if (pack_name == NULL)
free((void *) curr_pack);
if (index_name == NULL)
free((void *) curr_index);
return 0;
}