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-rw-r--r--index-pack.c218
1 files changed, 114 insertions, 104 deletions
diff --git a/index-pack.c b/index-pack.c
index 3c768fbc63..58c4a9c41d 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -6,15 +6,17 @@
#include "commit.h"
#include "tag.h"
#include "tree.h"
+#include "progress.h"
static const char index_pack_usage[] =
"git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
struct object_entry
{
- unsigned long offset;
+ off_t offset;
unsigned long size;
unsigned int hdr_size;
+ uint32_t crc32;
enum object_type type;
enum object_type real_type;
unsigned char sha1[20];
@@ -22,7 +24,7 @@ struct object_entry
union delta_base {
unsigned char sha1[20];
- unsigned long offset;
+ off_t offset;
};
/*
@@ -46,45 +48,14 @@ static int nr_resolved_deltas;
static int from_stdin;
static int verbose;
-static volatile sig_atomic_t progress_update;
-
-static void progress_interval(int signum)
-{
- progress_update = 1;
-}
-
-static void setup_progress_signal(void)
-{
- struct sigaction sa;
- struct itimerval v;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = progress_interval;
- sigemptyset(&sa.sa_mask);
- sa.sa_flags = SA_RESTART;
- sigaction(SIGALRM, &sa, NULL);
-
- v.it_interval.tv_sec = 1;
- v.it_interval.tv_usec = 0;
- v.it_value = v.it_interval;
- setitimer(ITIMER_REAL, &v, NULL);
-
-}
-
-static unsigned display_progress(unsigned n, unsigned total, unsigned last_pc)
-{
- unsigned percent = n * 100 / total;
- if (percent != last_pc || progress_update) {
- fprintf(stderr, "%4u%% (%u/%u) done\r", percent, n, total);
- progress_update = 0;
- }
- return percent;
-}
+static struct progress progress;
/* We always read in 4kB chunks. */
static unsigned char input_buffer[4096];
-static unsigned long input_offset, input_len, consumed_bytes;
+static unsigned int input_offset, input_len;
+static off_t consumed_bytes;
static SHA_CTX input_ctx;
+static uint32_t input_crc32;
static int input_fd, output_fd, pack_fd;
/* Discard current buffer used content. */
@@ -111,7 +82,7 @@ static void *fill(int min)
die("cannot fill %d bytes", min);
flush();
do {
- int ret = xread(input_fd, input_buffer + input_len,
+ ssize_t ret = xread(input_fd, input_buffer + input_len,
sizeof(input_buffer) - input_len);
if (ret <= 0) {
if (!ret)
@@ -127,8 +98,13 @@ 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 (consumed_bytes > consumed_bytes + bytes)
+ die("pack too large for current definition of off_t");
consumed_bytes += bytes;
}
@@ -216,10 +192,13 @@ static void *unpack_entry_data(unsigned long offset, unsigned long size)
static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
{
unsigned char *p, c;
- unsigned long size, base_offset;
+ unsigned long size;
+ off_t base_offset;
unsigned shift;
+ void *data;
obj->offset = consumed_bytes;
+ input_crc32 = crc32(0, Z_NULL, 0);
p = fill(1);
c = *p;
@@ -249,7 +228,7 @@ static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_
base_offset = c & 127;
while (c & 128) {
base_offset += 1;
- if (!base_offset || base_offset & ~(~0UL >> 7))
+ if (!base_offset || MSB(base_offset, 7))
bad_object(obj->offset, "offset value overflow for delta base object");
p = fill(1);
c = *p;
@@ -270,7 +249,9 @@ static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_
}
obj->hdr_size = consumed_bytes - obj->offset;
- return unpack_entry_data(obj->offset, obj->size);
+ data = unpack_entry_data(obj->offset, obj->size);
+ obj->crc32 = input_crc32;
+ return data;
}
static void *get_data_from_pack(struct object_entry *obj)
@@ -415,7 +396,7 @@ static int compare_delta_entry(const void *a, const void *b)
/* Parse all objects and return the pack content SHA1 hash */
static void parse_pack_objects(unsigned char *sha1)
{
- int i, percent = -1;
+ int i;
struct delta_entry *delta = deltas;
void *data;
struct stat st;
@@ -427,7 +408,7 @@ static void parse_pack_objects(unsigned char *sha1)
* - remember base (SHA1 or offset) for all deltas.
*/
if (verbose)
- fprintf(stderr, "Indexing %d objects.\n", nr_objects);
+ start_progress(&progress, "Indexing %u objects...", "", nr_objects);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
data = unpack_raw_entry(obj, &delta->base);
@@ -440,11 +421,11 @@ static void parse_pack_objects(unsigned char *sha1)
sha1_object(data, obj->size, obj->type, obj->sha1);
free(data);
if (verbose)
- percent = display_progress(i+1, nr_objects, percent);
+ display_progress(&progress, i+1);
}
objects[i].offset = consumed_bytes;
if (verbose)
- fputc('\n', stderr);
+ stop_progress(&progress);
/* Check pack integrity */
flush();
@@ -476,7 +457,7 @@ static void parse_pack_objects(unsigned char *sha1)
* for some more deltas.
*/
if (verbose)
- fprintf(stderr, "Resolving %d deltas.\n", nr_deltas);
+ start_progress(&progress, "Resolving %u deltas...", "", nr_deltas);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
union delta_base base;
@@ -508,14 +489,11 @@ static void parse_pack_objects(unsigned char *sha1)
}
free(data);
if (verbose)
- percent = display_progress(nr_resolved_deltas,
- nr_deltas, percent);
+ display_progress(&progress, nr_resolved_deltas);
}
- if (verbose && nr_resolved_deltas == nr_deltas)
- fputc('\n', stderr);
}
-static int write_compressed(int fd, void *in, unsigned int size)
+static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
{
z_stream stream;
unsigned long maxsize;
@@ -536,6 +514,7 @@ static int write_compressed(int fd, void *in, unsigned int size)
size = stream.total_out;
write_or_die(fd, out, size);
+ *obj_crc = crc32(*obj_crc, out, size);
free(out);
return size;
}
@@ -556,8 +535,10 @@ static void append_obj_to_pack(const unsigned char *sha1, void *buf,
}
header[n++] = c;
write_or_die(output_fd, header, n);
+ obj[0].crc32 = crc32(0, Z_NULL, 0);
+ obj[0].crc32 = crc32(obj[0].crc32, header, n);
obj[1].offset = obj[0].offset + n;
- obj[1].offset += write_compressed(output_fd, buf, size);
+ obj[1].offset += write_compressed(output_fd, buf, size, &obj[0].crc32);
hashcpy(obj->sha1, sha1);
}
@@ -571,7 +552,7 @@ static int delta_pos_compare(const void *_a, const void *_b)
static void fix_unresolved_deltas(int nr_unresolved)
{
struct delta_entry **sorted_by_pos;
- int i, n = 0, percent = -1;
+ int i, n = 0;
/*
* Since many unresolved deltas may well be themselves base objects
@@ -616,44 +597,13 @@ static void fix_unresolved_deltas(int nr_unresolved)
append_obj_to_pack(d->base.sha1, data, size, type);
free(data);
if (verbose)
- percent = display_progress(nr_resolved_deltas,
- nr_deltas, percent);
+ display_progress(&progress, nr_resolved_deltas);
}
free(sorted_by_pos);
- if (verbose)
- fputc('\n', stderr);
}
-static void readjust_pack_header_and_sha1(unsigned char *sha1)
-{
- struct pack_header hdr;
- SHA_CTX ctx;
- int size;
-
- /* Rewrite pack header with updated object number */
- if (lseek(output_fd, 0, SEEK_SET) != 0)
- die("cannot seek back: %s", strerror(errno));
- if (read_in_full(output_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
- die("cannot read pack header back: %s", strerror(errno));
- hdr.hdr_entries = htonl(nr_objects);
- if (lseek(output_fd, 0, SEEK_SET) != 0)
- die("cannot seek back: %s", strerror(errno));
- write_or_die(output_fd, &hdr, sizeof(hdr));
- if (lseek(output_fd, 0, SEEK_SET) != 0)
- die("cannot seek back: %s", strerror(errno));
-
- /* Recompute and store the new pack's SHA1 */
- SHA1_Init(&ctx);
- do {
- unsigned char *buf[4096];
- size = xread(output_fd, buf, sizeof(buf));
- if (size < 0)
- die("cannot read pack data back: %s", strerror(errno));
- SHA1_Update(&ctx, buf, size);
- } while (size > 0);
- SHA1_Final(sha1, &ctx);
- write_or_die(output_fd, sha1, 20);
-}
+static uint32_t index_default_version = 1;
+static uint32_t index_off32_limit = 0x7fffffff;
static int sha1_compare(const void *_a, const void *_b)
{
@@ -670,9 +620,10 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
{
struct sha1file *f;
struct object_entry **sorted_by_sha, **list, **last;
- unsigned int array[256];
+ uint32_t array[256];
int i, fd;
SHA_CTX ctx;
+ uint32_t index_version;
if (nr_objects) {
sorted_by_sha =
@@ -683,7 +634,6 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
sorted_by_sha[i] = &objects[i];
qsort(sorted_by_sha, nr_objects, sizeof(sorted_by_sha[0]),
sha1_compare);
-
}
else
sorted_by_sha = list = last = NULL;
@@ -702,6 +652,17 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
die("unable to create %s: %s", index_name, strerror(errno));
f = sha1fd(fd, index_name);
+ /* if last object's offset is >= 2^31 we should use index V2 */
+ index_version = (objects[nr_objects-1].offset >> 31) ? 2 : index_default_version;
+
+ /* index versions 2 and above need a header */
+ if (index_version >= 2) {
+ struct pack_idx_header hdr;
+ hdr.idx_signature = htonl(PACK_IDX_SIGNATURE);
+ hdr.idx_version = htonl(index_version);
+ sha1write(f, &hdr, sizeof(hdr));
+ }
+
/*
* Write the first-level table (the list is sorted,
* but we use a 256-entry lookup to be able to avoid
@@ -718,24 +679,61 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
array[i] = htonl(next - sorted_by_sha);
list = next;
}
- sha1write(f, array, 256 * sizeof(int));
+ sha1write(f, array, 256 * 4);
- /* recompute the SHA1 hash of sorted object names.
- * currently pack-objects does not do this, but that
- * can be fixed.
- */
+ /* compute the SHA1 hash of sorted object names. */
SHA1_Init(&ctx);
+
/*
* Write the actual SHA1 entries..
*/
list = sorted_by_sha;
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = *list++;
- unsigned int offset = htonl(obj->offset);
- sha1write(f, &offset, 4);
+ if (index_version < 2) {
+ uint32_t offset = htonl(obj->offset);
+ sha1write(f, &offset, 4);
+ }
sha1write(f, obj->sha1, 20);
SHA1_Update(&ctx, obj->sha1, 20);
}
+
+ if (index_version >= 2) {
+ unsigned int nr_large_offset = 0;
+
+ /* write the crc32 table */
+ list = sorted_by_sha;
+ for (i = 0; i < nr_objects; i++) {
+ struct object_entry *obj = *list++;
+ uint32_t crc32_val = htonl(obj->crc32);
+ sha1write(f, &crc32_val, 4);
+ }
+
+ /* write the 32-bit offset table */
+ list = sorted_by_sha;
+ for (i = 0; i < nr_objects; i++) {
+ struct object_entry *obj = *list++;
+ uint32_t offset = (obj->offset <= index_off32_limit) ?
+ obj->offset : (0x80000000 | nr_large_offset++);
+ offset = htonl(offset);
+ sha1write(f, &offset, 4);
+ }
+
+ /* write the large offset table */
+ list = sorted_by_sha;
+ while (nr_large_offset) {
+ struct object_entry *obj = *list++;
+ uint64_t offset = obj->offset;
+ if (offset > index_off32_limit) {
+ uint32_t split[2];
+ split[0] = htonl(offset >> 32);
+ split[1] = htonl(offset & 0xffffffff);
+ sha1write(f, split, 8);
+ nr_large_offset--;
+ }
+ }
+ }
+
sha1write(f, sha1, 20);
sha1close(f, NULL, 1);
free(sorted_by_sha);
@@ -865,6 +863,15 @@ int main(int argc, char **argv)
if (index_name || (i+1) >= argc)
usage(index_pack_usage);
index_name = argv[++i];
+ } else if (!prefixcmp(arg, "--index-version=")) {
+ char *c;
+ index_default_version = strtoul(arg + 16, &c, 10);
+ if (index_default_version > 2)
+ die("bad %s", arg);
+ if (*c == ',')
+ index_off32_limit = strtoul(c+1, &c, 0);
+ if (*c || index_off32_limit & 0x80000000)
+ die("bad %s", arg);
} else
usage(index_pack_usage);
continue;
@@ -904,10 +911,13 @@ int main(int argc, char **argv)
parse_pack_header();
objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
- if (verbose)
- setup_progress_signal();
parse_pack_objects(sha1);
- if (nr_deltas != nr_resolved_deltas) {
+ if (nr_deltas == nr_resolved_deltas) {
+ if (verbose)
+ stop_progress(&progress);
+ /* Flush remaining pack final 20-byte SHA1. */
+ flush();
+ } else {
if (fix_thin_pack) {
int nr_unresolved = nr_deltas - nr_resolved_deltas;
int nr_objects_initial = nr_objects;
@@ -917,17 +927,17 @@ int main(int argc, char **argv)
(nr_objects + nr_unresolved + 1)
* sizeof(*objects));
fix_unresolved_deltas(nr_unresolved);
- if (verbose)
+ if (verbose) {
+ stop_progress(&progress);
fprintf(stderr, "%d objects were added to complete this thin pack.\n",
nr_objects - nr_objects_initial);
- readjust_pack_header_and_sha1(sha1);
+ }
+ fixup_pack_header_footer(output_fd, sha1,
+ curr_pack, nr_objects);
}
if (nr_deltas != nr_resolved_deltas)
die("pack has %d unresolved deltas",
nr_deltas - nr_resolved_deltas);
- } else {
- /* Flush remaining pack final 20-byte SHA1. */
- flush();
}
free(deltas);
curr_index = write_index_file(index_name, sha1);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 09:43:54 +0000