#include "tree.h"
static const char index_pack_usage[] =
-"git-index-pack [-o index-file] pack-file";
+"git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
struct object_entry
{
unsigned long offset;
+ unsigned long size;
+ unsigned int hdr_size;
enum object_type type;
enum object_type real_type;
unsigned char sha1[20];
};
+union delta_base {
+ unsigned char sha1[20];
+ unsigned long offset;
+};
+
+/*
+ * 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
+
struct delta_entry
{
- struct object_entry *obj;
- unsigned char base_sha1[20];
+ union delta_base base;
+ int obj_no;
};
-static const char *pack_name;
-static unsigned char *pack_base;
-static unsigned long pack_size;
static struct object_entry *objects;
static struct delta_entry *deltas;
static int nr_objects;
static int nr_deltas;
+static int nr_resolved_deltas;
+
+static int from_stdin;
+static int verbose;
+
+static volatile sig_atomic_t progress_update;
-static void open_pack_file(void)
+static void progress_interval(int signum)
{
- int fd;
- struct stat st;
+ progress_update = 1;
+}
- fd = open(pack_name, O_RDONLY);
- if (fd < 0)
- die("cannot open packfile '%s': %s", pack_name,
- strerror(errno));
- if (fstat(fd, &st)) {
- int err = errno;
- close(fd);
- die("cannot fstat packfile '%s': %s", pack_name,
- strerror(err));
+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;
}
- pack_size = st.st_size;
- pack_base = mmap(NULL, pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (pack_base == MAP_FAILED) {
- int err = errno;
- close(fd);
- die("cannot mmap packfile '%s': %s", pack_name,
- strerror(err));
+ return percent;
+}
+
+/* We always read in 4kB chunks. */
+static unsigned char input_buffer[4096];
+static unsigned long input_offset, input_len, consumed_bytes;
+static SHA_CTX input_ctx;
+static int input_fd, output_fd, pack_fd;
+
+/* 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);
+ SHA1_Update(&input_ctx, input_buffer, input_offset);
+ memmove(input_buffer, input_buffer + input_offset, input_len);
+ input_offset = 0;
}
- close(fd);
}
-static void parse_pack_header(void)
+/*
+ * Make sure at least "min" bytes are available in the buffer, and
+ * return the pointer to the buffer.
+ */
+static void *fill(int min)
{
- const struct pack_header *hdr;
- unsigned char sha1[20];
- SHA_CTX ctx;
+ if (min <= input_len)
+ return input_buffer + input_offset;
+ if (min > sizeof(input_buffer))
+ die("cannot fill %d bytes", min);
+ flush();
+ do {
+ int ret = xread(input_fd, input_buffer + input_len,
+ sizeof(input_buffer) - input_len);
+ if (ret <= 0) {
+ if (!ret)
+ die("early EOF");
+ die("read error on input: %s", strerror(errno));
+ }
+ input_len += ret;
+ } while (input_len < min);
+ return input_buffer;
+}
+
+static void use(int bytes)
+{
+ if (bytes > input_len)
+ die("used more bytes than were available");
+ input_len -= bytes;
+ input_offset += bytes;
+ 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];
+ snprintf(tmpfile, sizeof(tmpfile),
+ "%s/pack_XXXXXX", get_object_directory());
+ output_fd = mkstemp(tmpfile);
+ pack_name = xstrdup(tmpfile);
+ } else
+ output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
+ if (output_fd < 0)
+ die("unable to create %s: %s\n", pack_name, strerror(errno));
+ pack_fd = output_fd;
+ } else {
+ input_fd = open(pack_name, O_RDONLY);
+ if (input_fd < 0)
+ die("cannot open packfile '%s': %s",
+ pack_name, strerror(errno));
+ output_fd = -1;
+ pack_fd = input_fd;
+ }
+ SHA1_Init(&input_ctx);
+ return pack_name;
+}
- /* Ensure there are enough bytes for the header and final SHA1 */
- if (pack_size < sizeof(struct pack_header) + 20)
- die("packfile '%s' is too small", pack_name);
+static void parse_pack_header(void)
+{
+ struct pack_header *hdr = fill(sizeof(struct pack_header));
/* Header consistency check */
- hdr = (void *)pack_base;
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
- die("packfile '%s' signature mismatch", pack_name);
+ die("pack signature mismatch");
if (!pack_version_ok(hdr->hdr_version))
- die("packfile '%s' version %d unsupported",
- pack_name, ntohl(hdr->hdr_version));
+ die("pack version %d unsupported", ntohl(hdr->hdr_version));
nr_objects = ntohl(hdr->hdr_entries);
-
- /* Check packfile integrity */
- SHA1_Init(&ctx);
- SHA1_Update(&ctx, pack_base, pack_size - 20);
- SHA1_Final(sha1, &ctx);
- if (memcmp(sha1, pack_base + pack_size - 20, 20))
- die("packfile '%s' SHA1 mismatch", pack_name);
+ use(sizeof(struct pack_header));
}
static void bad_object(unsigned long offset, const char *format,
va_start(params, format);
vsnprintf(buf, sizeof(buf), format, params);
va_end(params);
- die("packfile '%s': bad object at offset %lu: %s",
- pack_name, offset, buf);
+ die("pack has bad object at offset %lu: %s", offset, buf);
}
-static void *unpack_entry_data(unsigned long offset,
- unsigned long *current_pos, unsigned long size)
+static void *unpack_entry_data(unsigned long offset, unsigned long size)
{
- unsigned long pack_limit = pack_size - 20;
- unsigned long pos = *current_pos;
z_stream stream;
void *buf = xmalloc(size);
memset(&stream, 0, sizeof(stream));
stream.next_out = buf;
stream.avail_out = size;
- stream.next_in = pack_base + pos;
- stream.avail_in = pack_limit - pos;
+ stream.next_in = fill(1);
+ stream.avail_in = input_len;
inflateInit(&stream);
for (;;) {
int ret = inflate(&stream, 0);
- if (ret == Z_STREAM_END)
+ use(input_len - stream.avail_in);
+ if (stream.total_out == size && ret == Z_STREAM_END)
break;
if (ret != Z_OK)
bad_object(offset, "inflate returned %d", ret);
+ stream.next_in = fill(1);
+ stream.avail_in = input_len;
}
inflateEnd(&stream);
- if (stream.total_out != size)
- bad_object(offset, "size mismatch (expected %lu, got %lu)",
- size, stream.total_out);
- *current_pos = pack_limit - stream.avail_in;
return buf;
}
-static void *unpack_raw_entry(unsigned long offset,
- enum object_type *obj_type,
- unsigned long *obj_size,
- unsigned char *delta_base,
- unsigned long *next_obj_offset)
+static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
{
- unsigned long pack_limit = pack_size - 20;
- unsigned long pos = offset;
- unsigned char c;
- unsigned long size;
+ unsigned char *p, c;
+ unsigned long size, base_offset;
unsigned shift;
- enum object_type type;
- void *data;
- c = pack_base[pos++];
- type = (c >> 4) & 7;
+ obj->offset = consumed_bytes;
+
+ p = fill(1);
+ c = *p;
+ use(1);
+ obj->type = (c >> 4) & 7;
size = (c & 15);
shift = 4;
while (c & 0x80) {
- if (pos >= pack_limit)
- bad_object(offset, "object extends past end of pack");
- c = pack_base[pos++];
+ p = fill(1);
+ c = *p;
+ use(1);
size += (c & 0x7fUL) << shift;
shift += 7;
}
+ obj->size = size;
- switch (type) {
- case OBJ_DELTA:
- if (pos + 20 >= pack_limit)
- bad_object(offset, "object extends past end of pack");
- memcpy(delta_base, pack_base + pos, 20);
- pos += 20;
- /* fallthru */
+ 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 || base_offset & ~(~0UL >> 7))
+ bad_object(obj->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->offset - base_offset;
+ if (delta_base->offset >= obj->offset)
+ bad_object(obj->offset, "delta base offset is out of bound");
+ break;
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_BLOB:
case OBJ_TAG:
- data = unpack_entry_data(offset, &pos, size);
break;
default:
- bad_object(offset, "bad object type %d", type);
+ bad_object(obj->offset, "bad object type %d", obj->type);
}
+ obj->hdr_size = consumed_bytes - obj->offset;
- *obj_type = type;
- *obj_size = size;
- *next_obj_offset = pos;
+ return unpack_entry_data(obj->offset, obj->size);
+}
+
+static void *get_data_from_pack(struct object_entry *obj)
+{
+ unsigned long from = obj[0].offset + obj[0].hdr_size;
+ unsigned long len = obj[1].offset - from;
+ unsigned char *src, *data;
+ z_stream stream;
+ int st;
+
+ src = xmalloc(len);
+ if (pread(pack_fd, src, len, from) != len)
+ die("cannot pread pack file: %s", strerror(errno));
+ data = xmalloc(obj->size);
+ memset(&stream, 0, sizeof(stream));
+ stream.next_out = data;
+ stream.avail_out = obj->size;
+ stream.next_in = src;
+ stream.avail_in = len;
+ inflateInit(&stream);
+ while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
+ inflateEnd(&stream);
+ if (st != Z_STREAM_END || stream.total_out != obj->size)
+ die("serious inflate inconsistency");
+ free(src);
return data;
}
-static int find_delta(const unsigned char *base_sha1)
+static int find_delta(const union delta_base *base)
{
int first = 0, last = nr_deltas;
struct delta_entry *delta = &deltas[next];
int cmp;
- cmp = memcmp(base_sha1, delta->base_sha1, 20);
+ cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
if (!cmp)
return next;
if (cmp < 0) {
return -first-1;
}
-static int find_deltas_based_on_sha1(const unsigned char *base_sha1,
- int *first_index, int *last_index)
+static int find_delta_children(const union delta_base *base,
+ int *first_index, int *last_index)
{
- int first = find_delta(base_sha1);
+ int first = find_delta(base);
int last = first;
int end = nr_deltas - 1;
if (first < 0)
return -1;
- while (first > 0 && !memcmp(deltas[first-1].base_sha1, base_sha1, 20))
+ while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
--first;
- while (last < end && !memcmp(deltas[last+1].base_sha1, base_sha1, 20))
+ while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
++last;
*first_index = first;
*last_index = last;
SHA1_Final(sha1, &ctx);
}
-static void resolve_delta(struct delta_entry *delta, void *base_data,
+static void resolve_delta(struct object_entry *delta_obj, void *base_data,
unsigned long base_size, enum object_type type)
{
- struct object_entry *obj = delta->obj;
void *delta_data;
unsigned long delta_size;
void *result;
unsigned long result_size;
- enum object_type delta_type;
- unsigned char base_sha1[20];
- unsigned long next_obj_offset;
+ union delta_base delta_base;
int j, first, last;
- obj->real_type = type;
- delta_data = unpack_raw_entry(obj->offset, &delta_type,
- &delta_size, base_sha1,
- &next_obj_offset);
+ delta_obj->real_type = type;
+ delta_data = get_data_from_pack(delta_obj);
+ delta_size = delta_obj->size;
result = patch_delta(base_data, base_size, delta_data, delta_size,
&result_size);
free(delta_data);
if (!result)
- bad_object(obj->offset, "failed to apply delta");
- sha1_object(result, result_size, type, obj->sha1);
- if (!find_deltas_based_on_sha1(obj->sha1, &first, &last)) {
- for (j = first; j <= last; j++)
- resolve_delta(&deltas[j], result, result_size, type);
+ bad_object(delta_obj->offset, "failed to apply delta");
+ sha1_object(result, result_size, type, delta_obj->sha1);
+ nr_resolved_deltas++;
+
+ hashcpy(delta_base.sha1, delta_obj->sha1);
+ if (!find_delta_children(&delta_base, &first, &last)) {
+ for (j = first; j <= last; j++) {
+ struct object_entry *child = objects + deltas[j].obj_no;
+ if (child->real_type == OBJ_REF_DELTA)
+ resolve_delta(child, result, result_size, type);
+ }
+ }
+
+ memset(&delta_base, 0, sizeof(delta_base));
+ delta_base.offset = delta_obj->offset;
+ if (!find_delta_children(&delta_base, &first, &last)) {
+ for (j = first; j <= last; j++) {
+ struct object_entry *child = objects + deltas[j].obj_no;
+ if (child->real_type == OBJ_OFS_DELTA)
+ resolve_delta(child, result, result_size, type);
+ }
}
+
free(result);
}
{
const struct delta_entry *delta_a = a;
const struct delta_entry *delta_b = b;
- return memcmp(delta_a->base_sha1, delta_b->base_sha1, 20);
+ return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
}
-static void parse_pack_objects(void)
+/* Parse all objects and return the pack content SHA1 hash */
+static void parse_pack_objects(unsigned char *sha1)
{
- int i;
- unsigned long offset = sizeof(struct pack_header);
- unsigned char base_sha1[20];
+ int i, percent = -1;
+ struct delta_entry *delta = deltas;
void *data;
- unsigned long data_size;
+ struct stat st;
/*
* First pass:
* - find locations of all objects;
* - calculate SHA1 of all non-delta objects;
- * - remember base SHA1 for all deltas.
+ * - remember base (SHA1 or offset) for all deltas.
*/
+ if (verbose)
+ fprintf(stderr, "Indexing %d objects.\n", nr_objects);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
- obj->offset = offset;
- data = unpack_raw_entry(offset, &obj->type, &data_size,
- base_sha1, &offset);
+ data = unpack_raw_entry(obj, &delta->base);
obj->real_type = obj->type;
- if (obj->type == OBJ_DELTA) {
- struct delta_entry *delta = &deltas[nr_deltas++];
- delta->obj = obj;
- memcpy(delta->base_sha1, base_sha1, 20);
+ if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
+ nr_deltas++;
+ delta->obj_no = i;
+ delta++;
} else
- sha1_object(data, data_size, obj->type, obj->sha1);
+ sha1_object(data, obj->size, obj->type, obj->sha1);
free(data);
+ if (verbose)
+ percent = display_progress(i+1, nr_objects, percent);
}
- if (offset != pack_size - 20)
- die("packfile '%s' has junk at the end", pack_name);
-
- /* Sort deltas by base SHA1 for fast searching */
+ objects[i].offset = consumed_bytes;
+ if (verbose)
+ fputc('\n', stderr);
+
+ /* Check pack integrity */
+ flush();
+ 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("cannot fstat packfile: %s", strerror(errno));
+ if (S_ISREG(st.st_mode) && st.st_size != consumed_bytes)
+ 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);
* recursively checking if the resulting object is used as a base
* for some more deltas.
*/
+ if (verbose)
+ fprintf(stderr, "Resolving %d deltas.\n", nr_deltas);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
- int j, first, last;
+ union delta_base base;
+ int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
- if (obj->type == OBJ_DELTA)
+ if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
continue;
- if (find_deltas_based_on_sha1(obj->sha1, &first, &last))
+ hashcpy(base.sha1, obj->sha1);
+ ref = !find_delta_children(&base, &ref_first, &ref_last);
+ memset(&base, 0, sizeof(base));
+ base.offset = obj->offset;
+ ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
+ if (!ref && !ofs)
continue;
- data = unpack_raw_entry(obj->offset, &obj->type, &data_size,
- base_sha1, &offset);
- for (j = first; j <= last; j++)
- resolve_delta(&deltas[j], data, data_size, obj->type);
+ data = get_data_from_pack(obj);
+ if (ref)
+ for (j = ref_first; j <= ref_last; j++) {
+ struct object_entry *child = objects + deltas[j].obj_no;
+ if (child->real_type == OBJ_REF_DELTA)
+ resolve_delta(child, data,
+ obj->size, obj->type);
+ }
+ if (ofs)
+ for (j = ofs_first; j <= ofs_last; j++) {
+ struct object_entry *child = objects + deltas[j].obj_no;
+ if (child->real_type == OBJ_OFS_DELTA)
+ resolve_delta(child, data,
+ obj->size, obj->type);
+ }
free(data);
+ if (verbose)
+ percent = display_progress(nr_resolved_deltas,
+ nr_deltas, percent);
}
+ if (verbose && nr_resolved_deltas == nr_deltas)
+ fputc('\n', stderr);
+}
+
+static int write_compressed(int fd, void *in, unsigned int size)
+{
+ z_stream stream;
+ unsigned long maxsize;
+ void *out;
+
+ memset(&stream, 0, sizeof(stream));
+ deflateInit(&stream, zlib_compression_level);
+ maxsize = deflateBound(&stream, size);
+ out = xmalloc(maxsize);
+
+ /* Compress it */
+ stream.next_in = in;
+ stream.avail_in = size;
+ stream.next_out = out;
+ stream.avail_out = maxsize;
+ while (deflate(&stream, Z_FINISH) == Z_OK);
+ deflateEnd(&stream);
+
+ size = stream.total_out;
+ write_or_die(fd, out, size);
+ free(out);
+ return size;
+}
+
+static void append_obj_to_pack(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;
+ write_or_die(output_fd, header, n);
+ obj[1].offset = obj[0].offset + n;
+ obj[1].offset += write_compressed(output_fd, buf, size);
+ sha1_object(buf, size, type, obj->sha1);
+}
+
+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(int nr_unresolved)
+{
+ struct delta_entry **sorted_by_pos;
+ int i, n = 0, percent = -1;
- /* Check for unresolved deltas */
+ /*
+ * 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 (deltas[i].obj->real_type == OBJ_DELTA)
- die("packfile '%s' has unresolved deltas", pack_name);
+ 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];
+ void *data;
+ unsigned long size;
+ char type[10];
+ enum object_type obj_type;
+ int j, first, last;
+
+ if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
+ continue;
+ data = read_sha1_file(d->base.sha1, type, &size);
+ if (!data)
+ continue;
+ if (!strcmp(type, blob_type)) obj_type = OBJ_BLOB;
+ else if (!strcmp(type, tree_type)) obj_type = OBJ_TREE;
+ else if (!strcmp(type, commit_type)) obj_type = OBJ_COMMIT;
+ else if (!strcmp(type, tag_type)) obj_type = OBJ_TAG;
+ else die("base object %s is of type '%s'",
+ sha1_to_hex(d->base.sha1), type);
+
+ find_delta_children(&d->base, &first, &last);
+ for (j = first; j <= last; j++) {
+ struct object_entry *child = objects + deltas[j].obj_no;
+ if (child->real_type == OBJ_REF_DELTA)
+ resolve_delta(child, data, size, obj_type);
+ }
+
+ append_obj_to_pack(data, size, obj_type);
+ free(data);
+ if (verbose)
+ percent = display_progress(nr_resolved_deltas,
+ nr_deltas, percent);
}
+ 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 (xread(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 int sha1_compare(const void *_a, const void *_b)
{
struct object_entry *a = *(struct object_entry **)_a;
struct object_entry *b = *(struct object_entry **)_b;
- return memcmp(a->sha1, b->sha1, 20);
+ return hashcmp(a->sha1, b->sha1);
}
-static void write_index_file(const char *index_name, unsigned char *sha1)
+/*
+ * On entry *sha1 contains the pack content SHA1 hash, on exit it is
+ * the SHA1 hash of sorted object names.
+ */
+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];
- int i;
+ int i, fd;
SHA_CTX ctx;
if (nr_objects) {
else
sorted_by_sha = list = last = NULL;
- unlink(index_name);
- f = sha1create("%s", index_name);
+ if (!index_name) {
+ static char tmpfile[PATH_MAX];
+ snprintf(tmpfile, sizeof(tmpfile),
+ "%s/index_XXXXXX", get_object_directory());
+ fd = mkstemp(tmpfile);
+ index_name = xstrdup(tmpfile);
+ } else {
+ unlink(index_name);
+ fd = open(index_name, O_CREAT|O_EXCL|O_WRONLY, 0600);
+ }
+ if (fd < 0)
+ die("unable to create %s: %s", index_name, strerror(errno));
+ f = sha1fd(fd, index_name);
/*
* Write the first-level table (the list is sorted,
sha1write(f, obj->sha1, 20);
SHA1_Update(&ctx, obj->sha1, 20);
}
- sha1write(f, pack_base + pack_size - 20, 20);
+ sha1write(f, sha1, 20);
sha1close(f, NULL, 1);
free(sorted_by_sha);
SHA1_Final(sha1, &ctx);
+ return index_name;
+}
+
+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)
+{
+ char *report = "pack";
+ char name[PATH_MAX];
+ int err;
+
+ if (!from_stdin) {
+ close(input_fd);
+ } else {
+ err = close(output_fd);
+ if (err)
+ die("error while closing pack file: %s", strerror(errno));
+ chmod(curr_pack_name, 0444);
+ }
+
+ if (keep_msg) {
+ int keep_fd, keep_msg_len = strlen(keep_msg);
+ if (!keep_name) {
+ snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
+ get_object_directory(), sha1_to_hex(sha1));
+ keep_name = name;
+ }
+ keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (keep_fd < 0) {
+ if (errno != EEXIST)
+ die("cannot write keep file");
+ } else {
+ if (keep_msg_len > 0) {
+ write_or_die(keep_fd, keep_msg, keep_msg_len);
+ write_or_die(keep_fd, "\n", 1);
+ }
+ close(keep_fd);
+ 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");
+ }
+
+ chmod(curr_index_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");
+ }
+
+ 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));
+ xwrite(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;
+ }
+ }
}
int main(int argc, char **argv)
{
- int i;
- char *index_name = NULL;
- char *index_name_buf = NULL;
+ int i, fix_thin_pack = 0;
+ const char *curr_pack, *pack_name = NULL;
+ const char *curr_index, *index_name = NULL;
+ const char *keep_name = NULL, *keep_msg = NULL;
+ char *index_name_buf = NULL, *keep_name_buf = NULL;
unsigned char sha1[20];
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (*arg == '-') {
- if (!strcmp(arg, "-o")) {
+ if (!strcmp(arg, "--stdin")) {
+ from_stdin = 1;
+ } else if (!strcmp(arg, "--fix-thin")) {
+ fix_thin_pack = 1;
+ } else if (!strcmp(arg, "--keep")) {
+ keep_msg = "";
+ } else if (!strncmp(arg, "--keep=", 7)) {
+ keep_msg = arg + 7;
+ } else if (!strncmp(arg, "--pack_header=", 14)) {
+ 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];
pack_name = arg;
}
- if (!pack_name)
+ if (!pack_name && !from_stdin)
usage(index_pack_usage);
- if (!index_name) {
+ 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'",
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;
+ }
- open_pack_file();
+ curr_pack = open_pack_file(pack_name);
parse_pack_header();
- objects = xcalloc(nr_objects, sizeof(struct object_entry));
- deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
- parse_pack_objects();
+ 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 (fix_thin_pack) {
+ 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));
+ fix_unresolved_deltas(nr_unresolved);
+ if (verbose)
+ fprintf(stderr, "%d objects were added to complete this thin pack.\n",
+ nr_objects - nr_objects_initial);
+ readjust_pack_header_and_sha1(sha1);
+ }
+ 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);
- write_index_file(index_name, sha1);
+ curr_index = write_index_file(index_name, sha1);
+ final(pack_name, curr_pack,
+ index_name, curr_index,
+ keep_name, keep_msg,
+ sha1);
free(objects);
free(index_name_buf);
-
- printf("%s\n", sha1_to_hex(sha1));
+ free(keep_name_buf);
return 0;
}