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git/builtin/index-pack.c

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#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 "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 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;
int ref_first, ref_last;
int ofs_first, ofs_last;
};
#if !defined(NO_PTHREADS) && defined(NO_PREAD)
/* NO_PREAD uses compat/pread.c, which is not thread-safe. Disable threading. */
#define NO_PTHREADS
#endif
struct thread_local {
#ifndef NO_PTHREADS
pthread_t thread;
#endif
struct base_data *base_cache;
size_t base_cache_used;
};
/*
* 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 thread_local nothread_data;
static int nr_objects;
static int nr_deltas;
static int nr_resolved_deltas;
static int nr_threads;
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;
fix openssl headers conflicting with custom SHA1 implementations On ARM I have the following compilation errors: CC fast-import.o In file included from cache.h:8, from builtin.h:6, from fast-import.c:142: arm/sha1.h:14: error: conflicting types for 'SHA_CTX' /usr/include/openssl/sha.h:105: error: previous declaration of 'SHA_CTX' was here arm/sha1.h:16: error: conflicting types for 'SHA1_Init' /usr/include/openssl/sha.h:115: error: previous declaration of 'SHA1_Init' was here arm/sha1.h:17: error: conflicting types for 'SHA1_Update' /usr/include/openssl/sha.h:116: error: previous declaration of 'SHA1_Update' was here arm/sha1.h:18: error: conflicting types for 'SHA1_Final' /usr/include/openssl/sha.h:117: error: previous declaration of 'SHA1_Final' was here make: *** [fast-import.o] Error 1 This is because openssl header files are always included in git-compat-util.h since commit 684ec6c63c whenever NO_OPENSSL is not set, which somehow brings in <openssl/sha1.h> clashing with the custom ARM version. Compilation of git is probably broken on PPC too for the same reason. Turns out that the only file requiring openssl/ssl.h and openssl/err.h is imap-send.c. But only moving those problematic includes there doesn't solve the issue as it also includes cache.h which brings in the conflicting local SHA1 header file. As suggested by Jeff King, the best solution is to rename our references to SHA1 functions and structure to something git specific, and define those according to the implementation used. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-01 20:05:20 +02:00
static git_SHA_CTX input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd, pack_fd;
#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_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)
{
init_recursive_mutex(&read_mutex);
pthread_mutex_init(&counter_mutex, NULL);
pthread_mutex_init(&work_mutex, NULL);
pthread_key_create(&key, NULL);
thread_data = xcalloc(nr_threads, sizeof(*thread_data));
threads_active = 1;
}
static void cleanup_thread(void)
{
if (!threads_active)
return;
threads_active = 0;
pthread_mutex_destroy(&read_mutex);
pthread_mutex_destroy(&counter_mutex);
pthread_mutex_destroy(&work_mutex);
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()
#endif
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);
fix openssl headers conflicting with custom SHA1 implementations On ARM I have the following compilation errors: CC fast-import.o In file included from cache.h:8, from builtin.h:6, from fast-import.c:142: arm/sha1.h:14: error: conflicting types for 'SHA_CTX' /usr/include/openssl/sha.h:105: error: previous declaration of 'SHA_CTX' was here arm/sha1.h:16: error: conflicting types for 'SHA1_Init' /usr/include/openssl/sha.h:115: error: previous declaration of 'SHA1_Init' was here arm/sha1.h:17: error: conflicting types for 'SHA1_Update' /usr/include/openssl/sha.h:116: error: previous declaration of 'SHA1_Update' was here arm/sha1.h:18: error: conflicting types for 'SHA1_Final' /usr/include/openssl/sha.h:117: error: previous declaration of 'SHA1_Final' was here make: *** [fast-import.o] Error 1 This is because openssl header files are always included in git-compat-util.h since commit 684ec6c63c whenever NO_OPENSSL is not set, which somehow brings in <openssl/sha1.h> clashing with the custom ARM version. Compilation of git is probably broken on PPC too for the same reason. Turns out that the only file requiring openssl/ssl.h and openssl/err.h is imap-send.c. But only moving those problematic includes there doesn't solve the issue as it also includes cache.h which brings in the conflicting local SHA1 header file. As suggested by Jeff King, the best solution is to rename our references to SHA1 functions and structure to something git specific, and define those according to the implementation used. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-01 20:05:20 +02:00
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(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;
}
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);
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;
}
fix openssl headers conflicting with custom SHA1 implementations On ARM I have the following compilation errors: CC fast-import.o In file included from cache.h:8, from builtin.h:6, from fast-import.c:142: arm/sha1.h:14: error: conflicting types for 'SHA_CTX' /usr/include/openssl/sha.h:105: error: previous declaration of 'SHA_CTX' was here arm/sha1.h:16: error: conflicting types for 'SHA1_Init' /usr/include/openssl/sha.h:115: error: previous declaration of 'SHA1_Init' was here arm/sha1.h:17: error: conflicting types for 'SHA1_Update' /usr/include/openssl/sha.h:116: error: previous declaration of 'SHA1_Update' was here arm/sha1.h:18: error: conflicting types for 'SHA1_Final' /usr/include/openssl/sha.h:117: error: previous declaration of 'SHA1_Final' was here make: *** [fast-import.o] Error 1 This is because openssl header files are always included in git-compat-util.h since commit 684ec6c63c whenever NO_OPENSSL is not set, which somehow brings in <openssl/sha1.h> clashing with the custom ARM version. Compilation of git is probably broken on PPC too for the same reason. Turns out that the only file requiring openssl/ssl.h and openssl/err.h is imap-send.c. But only moving those problematic includes there doesn't solve the issue as it also includes cache.h which brings in the conflicting local SHA1 header file. As suggested by Jeff King, the best solution is to rename our references to SHA1 functions and structure to something git specific, and define those according to the implementation used. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-01 20:05:20 +02:00
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)));
Fix sparse warnings Fix warnings from 'make check'. - These files don't include 'builtin.h' causing sparse to complain that cmd_* isn't declared: builtin/clone.c:364, builtin/fetch-pack.c:797, builtin/fmt-merge-msg.c:34, builtin/hash-object.c:78, builtin/merge-index.c:69, builtin/merge-recursive.c:22 builtin/merge-tree.c:341, builtin/mktag.c:156, builtin/notes.c:426 builtin/notes.c:822, builtin/pack-redundant.c:596, builtin/pack-refs.c:10, builtin/patch-id.c:60, builtin/patch-id.c:149, builtin/remote.c:1512, builtin/remote-ext.c:240, builtin/remote-fd.c:53, builtin/reset.c:236, builtin/send-pack.c:384, builtin/unpack-file.c:25, builtin/var.c:75 - These files have symbols which should be marked static since they're only file scope: submodule.c:12, diff.c:631, replace_object.c:92, submodule.c:13, submodule.c:14, trace.c:78, transport.c:195, transport-helper.c:79, unpack-trees.c:19, url.c:3, url.c:18, url.c:104, url.c:117, url.c:123, url.c:129, url.c:136, thread-utils.c:21, thread-utils.c:48 - These files redeclare symbols to be different types: builtin/index-pack.c:210, parse-options.c:564, parse-options.c:571, usage.c:49, usage.c:58, usage.c:63, usage.c:72 - These files use a literal integer 0 when they really should use a NULL pointer: daemon.c:663, fast-import.c:2942, imap-send.c:1072, notes-merge.c:362 While we're in the area, clean up some unused #includes in builtin files (mostly exec_cmd.h). Signed-off-by: Stephen Boyd <bebarino@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-22 08:51:05 +01:00
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 &nothread_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 = xmalloc(sizeof(struct base_data));
memset(base, 0, sizeof(*base));
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;
2011-06-10 20:52:15 +02:00
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 = xmalloc(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,
union delta_base *delta_base,
unsigned char *sha1)
{
Fix big left-shifts of unsigned char Shifting 'unsigned char' or 'unsigned short' left can result in sign extension errors, since the C integer promotion rules means that the unsigned char/short will get implicitly promoted to a signed 'int' due to the shift (or due to other operations). This normally doesn't matter, but if you shift things up sufficiently, it will now set the sign bit in 'int', and a subsequent cast to a bigger type (eg 'long' or 'unsigned long') will now sign-extend the value despite the original expression being unsigned. One example of this would be something like unsigned long size; unsigned char c; size += c << 24; where despite all the variables being unsigned, 'c << 24' ends up being a signed entity, and will get sign-extended when then doing the addition in an 'unsigned long' type. Since git uses 'unsigned char' pointers extensively, we actually have this bug in a couple of places. I may have missed some, but this is the result of looking at git grep '[^0-9 ][ ]*<<[ ][a-z]' -- '*.c' '*.h' git grep '<<[ ]*24' which catches at least the common byte cases (shifting variables by a variable amount, and shifting by 24 bits). I also grepped for just 'unsigned char' variables in general, and converted the ones that most obviously ended up getting implicitly cast immediately anyway (eg hash_name(), encode_85()). In addition to just avoiding 'unsigned char', this patch also tries to use a common idiom for the delta header size thing. We had three different variations on it: "& 0x7fUL" in one place (getting the sign extension right), and "& ~0x80" and "& 0x7f" in two other places (not getting it right). Apart from making them all just avoid using "unsigned char" at all, I also unified them to then use a simple "& 0x7f". I considered making a sparse extension which warns about doing implicit casts from unsigned types to signed types, but it gets rather complex very quickly, so this is just a hack. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-18 02:22:27 +02:00
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);
Fix big left-shifts of unsigned char Shifting 'unsigned char' or 'unsigned short' left can result in sign extension errors, since the C integer promotion rules means that the unsigned char/short will get implicitly promoted to a signed 'int' due to the shift (or due to other operations). This normally doesn't matter, but if you shift things up sufficiently, it will now set the sign bit in 'int', and a subsequent cast to a bigger type (eg 'long' or 'unsigned long') will now sign-extend the value despite the original expression being unsigned. One example of this would be something like unsigned long size; unsigned char c; size += c << 24; where despite all the variables being unsigned, 'c << 24' ends up being a signed entity, and will get sign-extended when then doing the addition in an 'unsigned long' type. Since git uses 'unsigned char' pointers extensively, we actually have this bug in a couple of places. I may have missed some, but this is the result of looking at git grep '[^0-9 ][ ]*<<[ ][a-z]' -- '*.c' '*.h' git grep '<<[ ]*24' which catches at least the common byte cases (shifting variables by a variable amount, and shifting by 24 bits). I also grepped for just 'unsigned char' variables in general, and converted the ones that most obviously ended up getting implicitly cast immediately anyway (eg hash_name(), encode_85()). In addition to just avoiding 'unsigned char', this patch also tries to use a common idiom for the delta header size thing. We had three different variations on it: "& 0x7fUL" in one place (getting the sign extension right), and "& ~0x80" and "& 0x7f" in two other places (not getting it right). Apart from making them all just avoid using "unsigned char" at all, I also unified them to then use a simple "& 0x7f". I considered making a sparse extension which warns about doing implicit casts from unsigned types to signed types, but it gets rather complex very quickly, so this is just a hack. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-18 02:22:27 +02:00
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->type, sha1);
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;
2011-06-10 20:52:15 +02:00
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(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;
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, struct object_entry *obj_entry,
unsigned long size, enum object_type type,
const unsigned char *sha1)
{
void *new_data = NULL;
assert(data || obj_entry);
read_lock();
if (has_sha1_file(sha1)) {
don't ever allow SHA1 collisions to exist by fetching a pack Waaaaaaay back Git was considered to be secure as it never overwrote an object it already had. This was ensured by always unpacking the packfile received over the network (both in fetch and receive-pack) and our already existing logic to not create a loose object for an object we already have. Lately however we keep "large-ish" packfiles on both fetch and push by running them through index-pack instead of unpack-objects. This would let an attacker perform a birthday attack. How? Assume the attacker knows a SHA-1 that has two different data streams. He knows the client is likely to have the "good" one. So he sends the "evil" variant to the other end as part of a "large-ish" packfile. The recipient keeps that packfile, and indexes it. Now since this is a birthday attack there is a SHA-1 collision; two objects exist in the repository with the same SHA-1. They have *very* different data streams. One of them is "evil". Currently the poor recipient cannot tell the two objects apart, short of by examining the timestamp of the packfiles. But lets say the recipient repacks before he realizes he's been attacked. We may wind up packing the "evil" version of the object, and deleting the "good" one. This is made *even more likely* by Junio's recent rearrange_packed_git patch (b867092f). It is extremely unlikely for a SHA1 collisions to occur, but if it ever happens with a remote (hence untrusted) object we simply must not let the fetch succeed. Normally received packs should not contain objects we already have. But when they do we must ensure duplicated objects with the same SHA1 actually contain the same data. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-20 20:32:35 +01:00
void *has_data;
enum object_type has_type;
unsigned long has_size;
if (!data)
data = new_data = get_data_from_pack(obj_entry);
don't ever allow SHA1 collisions to exist by fetching a pack Waaaaaaay back Git was considered to be secure as it never overwrote an object it already had. This was ensured by always unpacking the packfile received over the network (both in fetch and receive-pack) and our already existing logic to not create a loose object for an object we already have. Lately however we keep "large-ish" packfiles on both fetch and push by running them through index-pack instead of unpack-objects. This would let an attacker perform a birthday attack. How? Assume the attacker knows a SHA-1 that has two different data streams. He knows the client is likely to have the "good" one. So he sends the "evil" variant to the other end as part of a "large-ish" packfile. The recipient keeps that packfile, and indexes it. Now since this is a birthday attack there is a SHA-1 collision; two objects exist in the repository with the same SHA-1. They have *very* different data streams. One of them is "evil". Currently the poor recipient cannot tell the two objects apart, short of by examining the timestamp of the packfiles. But lets say the recipient repacks before he realizes he's been attacked. We may wind up packing the "evil" version of the object, and deleting the "good" one. This is made *even more likely* by Junio's recent rearrange_packed_git patch (b867092f). It is extremely unlikely for a SHA1 collisions to occur, but if it ever happens with a remote (hence untrusted) object we simply must not let the fetch succeed. Normally received packs should not contain objects we already have. But when they do we must ensure duplicated objects with the same SHA1 actually contain the same data. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-20 20:32:35 +01:00
has_data = read_sha1_file(sha1, &has_type, &has_size);
read_unlock();
don't ever allow SHA1 collisions to exist by fetching a pack Waaaaaaay back Git was considered to be secure as it never overwrote an object it already had. This was ensured by always unpacking the packfile received over the network (both in fetch and receive-pack) and our already existing logic to not create a loose object for an object we already have. Lately however we keep "large-ish" packfiles on both fetch and push by running them through index-pack instead of unpack-objects. This would let an attacker perform a birthday attack. How? Assume the attacker knows a SHA-1 that has two different data streams. He knows the client is likely to have the "good" one. So he sends the "evil" variant to the other end as part of a "large-ish" packfile. The recipient keeps that packfile, and indexes it. Now since this is a birthday attack there is a SHA-1 collision; two objects exist in the repository with the same SHA-1. They have *very* different data streams. One of them is "evil". Currently the poor recipient cannot tell the two objects apart, short of by examining the timestamp of the packfiles. But lets say the recipient repacks before he realizes he's been attacked. We may wind up packing the "evil" version of the object, and deleting the "good" one. This is made *even more likely* by Junio's recent rearrange_packed_git patch (b867092f). It is extremely unlikely for a SHA1 collisions to occur, but if it ever happens with a remote (hence untrusted) object we simply must not let the fetch succeed. Normally received packs should not contain objects we already have. But when they do we must ensure duplicated objects with the same SHA1 actually contain the same data. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-20 20:32:35 +01:00
if (!has_data)
die(_("cannot read existing object %s"), sha1_to_hex(sha1));
don't ever allow SHA1 collisions to exist by fetching a pack Waaaaaaay back Git was considered to be secure as it never overwrote an object it already had. This was ensured by always unpacking the packfile received over the network (both in fetch and receive-pack) and our already existing logic to not create a loose object for an object we already have. Lately however we keep "large-ish" packfiles on both fetch and push by running them through index-pack instead of unpack-objects. This would let an attacker perform a birthday attack. How? Assume the attacker knows a SHA-1 that has two different data streams. He knows the client is likely to have the "good" one. So he sends the "evil" variant to the other end as part of a "large-ish" packfile. The recipient keeps that packfile, and indexes it. Now since this is a birthday attack there is a SHA-1 collision; two objects exist in the repository with the same SHA-1. They have *very* different data streams. One of them is "evil". Currently the poor recipient cannot tell the two objects apart, short of by examining the timestamp of the packfiles. But lets say the recipient repacks before he realizes he's been attacked. We may wind up packing the "evil" version of the object, and deleting the "good" one. This is made *even more likely* by Junio's recent rearrange_packed_git patch (b867092f). It is extremely unlikely for a SHA1 collisions to occur, but if it ever happens with a remote (hence untrusted) object we simply must not let the fetch succeed. Normally received packs should not contain objects we already have. But when they do we must ensure duplicated objects with the same SHA1 actually contain the same data. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-20 20:32:35 +01:00
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);
} else
read_unlock();
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;
if (!buf)
buf = new_data = get_data_from_pack(obj_entry);
/*
* 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;
}
read_unlock();
}
free(new_data);
}
/*
* This function is part of find_unresolved_deltas(). There are two
* walkers going in the opposite ways.
*
* The first one in find_unresolved_deltas() traverses down from
* parent node to children, deflating nodes along the way. However,
* memory for deflated nodes is limited by delta_base_cache_limit, so
* at some point parent node's deflated content may be freed.
*
* The second walker is this function, which goes from current node up
* to top parent if necessary to deflate the node. In normal
* situation, its parent node would be already deflated, so it just
* needs to apply delta.
*
* In the worst case scenario, parent node is no longer deflated because
* we're running out of delta_base_cache_limit; we need to re-deflate
* parents, possibly up to the top base.
*
* All deflated objects here are subject to be freed if we exceed
* delta_base_cache_limit, just like in find_unresolved_deltas(), we
* just need to make sure the last node is not freed.
*/
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;
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"));
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 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) {
union delta_base base_spec;
hashcpy(base_spec.sha1, base->obj->idx.sha1);
find_delta_children(&base_spec,
&base->ref_first, &base->ref_last, OBJ_REF_DELTA);
memset(&base_spec, 0, sizeof(base_spec));
base_spec.offset = base->obj->idx.offset;
find_delta_children(&base_spec,
&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 + deltas[base->ref_first].obj_no;
struct base_data *result = alloc_base_data();
assert(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 + deltas[base->ofs_first].obj_no;
struct base_data *result = alloc_base_data();
assert(child->real_type == OBJ_OFS_DELTA);
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_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);
}
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;
work_lock();
display_progress(progress, nr_resolved_deltas);
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
/*
* 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 *sha1)
{
int i, nr_delays = 0;
struct delta_entry *delta = deltas;
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, &delta->base, obj->idx.sha1);
obj->real_type = obj->type;
if (is_delta_type(obj->type)) {
nr_deltas++;
delta->obj_no = i;
delta++;
} 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.sha1);
free(data);
display_progress(progress, i+1);
}
objects[i].idx.offset = consumed_bytes;
stop_progress(&progress);
/* Check pack integrity */
flush();
fix openssl headers conflicting with custom SHA1 implementations On ARM I have the following compilation errors: CC fast-import.o In file included from cache.h:8, from builtin.h:6, from fast-import.c:142: arm/sha1.h:14: error: conflicting types for 'SHA_CTX' /usr/include/openssl/sha.h:105: error: previous declaration of 'SHA_CTX' was here arm/sha1.h:16: error: conflicting types for 'SHA1_Init' /usr/include/openssl/sha.h:115: error: previous declaration of 'SHA1_Init' was here arm/sha1.h:17: error: conflicting types for 'SHA1_Update' /usr/include/openssl/sha.h:116: error: previous declaration of 'SHA1_Update' was here arm/sha1.h:18: error: conflicting types for 'SHA1_Final' /usr/include/openssl/sha.h:117: error: previous declaration of 'SHA1_Final' was here make: *** [fast-import.o] Error 1 This is because openssl header files are always included in git-compat-util.h since commit 684ec6c63c whenever NO_OPENSSL is not set, which somehow brings in <openssl/sha1.h> clashing with the custom ARM version. Compilation of git is probably broken on PPC too for the same reason. Turns out that the only file requiring openssl/ssl.h and openssl/err.h is imap-send.c. But only moving those problematic includes there doesn't solve the issue as it also includes cache.h which brings in the conflicting local SHA1 header file. As suggested by Jeff King, the best solution is to rename our references to SHA1 functions and structure to something git specific, and define those according to the implementation used. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-01 20:05:20 +02:00
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"));
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()"));
}
/*
* 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_deltas)
return;
/* Sort deltas by base SHA1/offset for fast searching */
qsort(deltas, nr_deltas, sizeof(struct delta_entry),
compare_delta_entry);
if (verbose)
progress = start_progress(_("Resolving deltas"), nr_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);
}
}
/*
* Third pass:
* - append objects to convert thin pack to full pack if required
* - write the final 20-byte SHA-1
*/
static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
{
if (nr_deltas == nr_resolved_deltas) {
stop_progress(&progress);
/* Flush remaining pack final 20-byte SHA1. */
flush();
return;
}
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(Q_("pack has %d unresolved delta",
"pack has %d unresolved deltas",
nr_deltas - nr_resolved_deltas),
nr_deltas - nr_resolved_deltas);
}
static int write_compressed(struct sha1file *f, void *in, unsigned int size)
{
2011-06-10 20:52:15 +02:00
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 = alloc_base_data();
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);
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;
}
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;
/* 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_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, 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, "--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 (!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;
#ifndef NO_PTHREADS
if (!nr_threads) {
nr_threads = online_cpus();
/* An experiment showed that more threads does not mean faster */
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));
deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
parse_pack_objects(pack_sha1);
resolve_deltas();
conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
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;
}