-#include "cache.h"
+#include "builtin.h"
#include "delta.h"
#include "pack.h"
#include "csum-file.h"
#include "exec_cmd.h"
static const char index_pack_usage[] =
-"git index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] [--strict] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
+"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
-struct object_entry
-{
+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 {
#define FLAG_LINK (1u<<20)
#define FLAG_CHECKED (1u<<21)
-struct delta_entry
-{
+struct delta_entry {
union delta_base base;
int obj_no;
};
static unsigned char input_buffer[4096];
static unsigned int input_offset, input_len;
static off_t consumed_bytes;
+static unsigned deepest_delta;
static git_SHA_CTX input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd, pack_fd;
input_offset += bytes;
/* make sure off_t is sufficiently large not to wrap */
- if (consumed_bytes > consumed_bytes + bytes)
+ if (signed_add_overflows(consumed_bytes, bytes))
die("pack too large for current definition of off_t");
consumed_bytes += bytes;
}
static NORETURN void bad_object(unsigned long offset, const char *format,
...) __attribute__((format (printf, 2, 3)));
-static void bad_object(unsigned long offset, const char *format, ...)
+static NORETURN void bad_object(unsigned long offset, const char *format, ...)
{
va_list params;
char buf[1024];
static void *unpack_entry_data(unsigned long offset, unsigned long size)
{
- z_stream stream;
+ int status;
+ git_zstream stream;
void *buf = xmalloc(size);
memset(&stream, 0, sizeof(stream));
+ git_inflate_init(&stream);
stream.next_out = buf;
stream.avail_out = size;
- stream.next_in = fill(1);
- stream.avail_in = input_len;
- git_inflate_init(&stream);
- for (;;) {
- int ret = git_inflate(&stream, 0);
- 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);
+ do {
stream.next_in = fill(1);
stream.avail_in = input_len;
- }
+ status = git_inflate(&stream, 0);
+ use(input_len - stream.avail_in);
+ } while (status == Z_OK);
+ if (stream.total_out != size || status != Z_STREAM_END)
+ bad_object(offset, "inflate returned %d", status);
git_inflate_end(&stream);
return buf;
}
void *data;
obj->idx.offset = consumed_bytes;
- input_crc32 = crc32(0, Z_NULL, 0);
+ input_crc32 = crc32(0, NULL, 0);
p = fill(1);
c = *p;
{
off_t from = obj[0].idx.offset + obj[0].hdr_size;
unsigned long len = obj[1].idx.offset - from;
- unsigned long rdy = 0;
- unsigned char *src, *data;
- z_stream stream;
- int st;
+ unsigned char *data, *inbuf;
+ git_zstream stream;
+ int status;
- src = xmalloc(len);
- data = src;
- do {
- ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
- if (n < 0)
- die_errno("cannot pread pack file");
- if (!n)
- die("premature end of pack file, %lu bytes missing",
- len - rdy);
- rdy += n;
- } while (rdy < len);
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;
- stream.next_in = src;
- stream.avail_in = len;
- git_inflate_init(&stream);
- while ((st = git_inflate(&stream, Z_FINISH)) == Z_OK);
- git_inflate_end(&stream);
- if (st != Z_STREAM_END || stream.total_out != obj->size)
+
+ do {
+ ssize_t n = (len < 64*1024) ? len : 64*1024;
+ n = pread(pack_fd, inbuf, n, from);
+ if (n < 0)
+ die_errno("cannot pread pack file");
+ if (!n)
+ die("premature end of pack file, %lu bytes missing", len);
+ from += n;
+ len -= n;
+ stream.next_in = inbuf;
+ stream.avail_in = n;
+ status = git_inflate(&stream, 0);
+ } while (len && status == Z_OK && !stream.avail_in);
+
+ /* This has been inflated OK when first encountered, so... */
+ if (status != Z_STREAM_END || stream.total_out != obj->size)
die("serious inflate inconsistency");
- free(src);
+
+ git_inflate_end(&stream);
+ free(inbuf);
return data;
}
-static int find_delta(const union delta_base *base)
+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;
struct delta_entry *delta = &deltas[next];
int cmp;
- cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
+ cmp = compare_delta_bases(base, &delta->base,
+ type, objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
}
static void find_delta_children(const union delta_base *base,
- int *first_index, int *last_index)
+ int *first_index, int *last_index,
+ enum object_type type)
{
- int first = find_delta(base);
+ int first = find_delta(base, type);
int last = first;
int end = nr_deltas - 1;
}
}
+static int is_delta_type(enum object_type type)
+{
+ return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
+}
+
static void *get_base_data(struct base_data *c)
{
if (!c->data) {
struct object_entry *obj = c->obj;
- if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
+ if (is_delta_type(obj->type)) {
void *base = get_base_data(c->base);
void *raw = get_data_from_pack(obj);
c->data = patch_delta(
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;
union delta_base base_spec;
hashcpy(base_spec.sha1, base->obj->idx.sha1);
- find_delta_children(&base_spec, &ref_first, &ref_last);
+ find_delta_children(&base_spec,
+ &ref_first, &ref_last, OBJ_REF_DELTA);
memset(&base_spec, 0, sizeof(base_spec));
base_spec.offset = base->obj->idx.offset;
- find_delta_children(&base_spec, &ofs_first, &ofs_last);
+ find_delta_children(&base_spec,
+ &ofs_first, &ofs_last, OBJ_OFS_DELTA);
}
if (ref_last == -1 && ofs_last == -1) {
for (i = ref_first; i <= ref_last; i++) {
struct object_entry *child = objects + deltas[i].obj_no;
- if (child->real_type == OBJ_REF_DELTA) {
- struct base_data result;
- resolve_delta(child, base, &result);
- if (i == ref_last && ofs_last == -1)
- free_base_data(base);
- find_unresolved_deltas(&result, base);
- }
+ struct base_data result;
+
+ assert(child->real_type == OBJ_REF_DELTA);
+ resolve_delta(child, base, &result);
+ if (i == ref_last && ofs_last == -1)
+ free_base_data(base);
+ find_unresolved_deltas(&result, base);
}
for (i = ofs_first; i <= ofs_last; i++) {
struct object_entry *child = objects + deltas[i].obj_no;
- if (child->real_type == OBJ_OFS_DELTA) {
- struct base_data result;
- resolve_delta(child, base, &result);
- if (i == ofs_last)
- free_base_data(base);
- find_unresolved_deltas(&result, base);
- }
+ struct base_data result;
+
+ assert(child->real_type == OBJ_OFS_DELTA);
+ resolve_delta(child, base, &result);
+ if (i == ofs_last)
+ free_base_data(base);
+ find_unresolved_deltas(&result, base);
}
unlink_base_data(base);
{
const struct delta_entry *delta_a = a;
const struct delta_entry *delta_b = b;
- return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
+
+ /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
+ return compare_delta_bases(&delta_a->base, &delta_b->base,
+ objects[delta_a->obj_no].type,
+ objects[delta_b->obj_no].type);
}
/* Parse all objects and return the pack content SHA1 hash */
struct object_entry *obj = &objects[i];
void *data = unpack_raw_entry(obj, &delta->base);
obj->real_type = obj->type;
- if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
+ if (is_delta_type(obj->type)) {
nr_deltas++;
delta->obj_no = i;
delta++;
struct object_entry *obj = &objects[i];
struct base_data base_obj;
- if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
+ if (is_delta_type(obj->type))
continue;
base_obj.obj = obj;
base_obj.data = NULL;
static int write_compressed(struct sha1file *f, void *in, unsigned int size)
{
- z_stream stream;
- unsigned long maxsize;
- void *out;
+ git_zstream stream;
+ int status;
+ unsigned char outbuf[4096];
memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, zlib_compression_level);
- maxsize = deflateBound(&stream, size);
- out = xmalloc(maxsize);
-
- /* Compress it */
+ git_deflate_init(&stream, zlib_compression_level);
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);
+ 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;
- sha1write(f, out, size);
- free(out);
+ git_deflate_end(&stream);
return size;
}
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")) {
- pack_idx_default_version = git_config_int(k, v);
- if (pack_idx_default_version > 2)
- die("bad pack.indexversion=%"PRIu32,
- pack_idx_default_version);
+ opts->version = git_config_int(k, v);
+ if (opts->version > 2)
+ die("bad pack.indexversion=%"PRIu32, opts->version);
return 0;
}
return git_default_config(k, v, cb);
}
+static int cmp_uint32(const void *a_, const void *b_)
+{
+ uint32_t a = *((uint32_t *)a_);
+ uint32_t b = *((uint32_t *)b_);
+
+ return (a < b) ? -1 : (a != b);
+}
+
+static void read_v2_anomalous_offsets(struct packed_git *p,
+ struct pack_idx_option *opts)
+{
+ const uint32_t *idx1, *idx2;
+ uint32_t i;
+
+ /* The address of the 4-byte offset table */
+ idx1 = (((const uint32_t *)p->index_data)
+ + 2 /* 8-byte header */
+ + 256 /* fan out */
+ + 5 * p->num_objects /* 20-byte SHA-1 table */
+ + p->num_objects /* CRC32 table */
+ );
+
+ /* The address of the 8-byte offset table */
+ idx2 = idx1 + p->num_objects;
+
+ for (i = 0; i < p->num_objects; i++) {
+ uint32_t off = ntohl(idx1[i]);
+ if (!(off & 0x80000000))
+ continue;
+ off = off & 0x7fffffff;
+ if (idx2[off * 2])
+ continue;
+ /*
+ * The real offset is ntohl(idx2[off * 2]) in high 4
+ * octets, and ntohl(idx2[off * 2 + 1]) in low 4
+ * octets. But idx2[off * 2] is Zero!!!
+ */
+ ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
+ opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
+ }
+
+ if (1 < opts->anomaly_nr)
+ qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
+}
+
+static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
+{
+ struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
+
+ if (!p)
+ die("Cannot open existing pack file '%s'", pack_name);
+ if (open_pack_index(p))
+ die("Cannot open existing pack idx file for '%s'", pack_name);
+
+ /* Read the attributes from the existing idx file */
+ opts->version = p->index_version;
+
+ if (opts->version == 2)
+ read_v2_anomalous_offsets(p, opts);
+
+ /*
+ * Get rid of the idx file as we do not need it anymore.
+ * NEEDSWORK: extract this bit from free_pack_by_name() in
+ * sha1_file.c, perhaps? It shouldn't matter very much as we
+ * know we haven't installed this pack (hence we never have
+ * read anything from it).
+ */
+ close_pack_index(p);
+ free(p);
+}
+
+static void show_pack_info(int stat_only)
+{
+ int i, baseobjects = nr_objects - nr_deltas;
+ unsigned long *chain_histogram = NULL;
+
+ if (deepest_delta)
+ chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
+
+ for (i = 0; i < nr_objects; i++) {
+ struct object_entry *obj = &objects[i];
+
+ if (is_delta_type(obj->type))
+ chain_histogram[obj->delta_depth - 1]++;
+ if (stat_only)
+ continue;
+ printf("%s %-6s %lu %lu %"PRIuMAX,
+ sha1_to_hex(obj->idx.sha1),
+ typename(obj->real_type), obj->size,
+ (unsigned long)(obj[1].idx.offset - obj->idx.offset),
+ (uintmax_t)obj->idx.offset);
+ if (is_delta_type(obj->type)) {
+ struct object_entry *bobj = &objects[obj->base_object_no];
+ printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
+ }
+ putchar('\n');
+ }
+
+ if (baseobjects)
+ printf("non delta: %d object%s\n",
+ baseobjects, baseobjects > 1 ? "s" : "");
+ for (i = 0; i < deepest_delta; i++) {
+ if (!chain_histogram[i])
+ continue;
+ printf("chain length = %d: %lu object%s\n",
+ i + 1,
+ chain_histogram[i],
+ chain_histogram[i] > 1 ? "s" : "");
+ }
+}
+
int cmd_index_pack(int argc, const char **argv, const char *prefix)
{
- int i, fix_thin_pack = 0;
+ 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);
- /*
- * We wish to read the repository's config file if any, and
- * for that it is necessary to call setup_git_directory_gently().
- * However if the cwd was inside .git/objects/pack/ then we need
- * to go back there or all the pack name arguments will be wrong.
- * And in that case we cannot rely on any prefix returned by
- * setup_git_directory_gently() either.
- */
- {
- char cwd[PATH_MAX+1];
- int nongit;
-
- if (!getcwd(cwd, sizeof(cwd)-1))
- die("Unable to get current working directory");
- setup_git_directory_gently(&nongit);
- git_config(git_index_pack_config, NULL);
- if (chdir(cwd))
- die("Cannot come back to cwd");
- }
+ 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];
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=")) {
index_name = argv[++i];
} else if (!prefixcmp(arg, "--index-version=")) {
char *c;
- pack_idx_default_version = strtoul(arg + 16, &c, 10);
- if (pack_idx_default_version > 2)
+ opts.version = strtoul(arg + 16, &c, 10);
+ if (opts.version > 2)
die("bad %s", arg);
if (*c == ',')
- pack_idx_off32_limit = strtoul(c+1, &c, 0);
- if (*c || pack_idx_off32_limit & 0x80000000)
+ opts.off32_limit = strtoul(c+1, &c, 0);
+ if (*c || opts.off32_limit & 0x80000000)
die("bad %s", arg);
} else
usage(index_pack_usage);
strcpy(keep_name_buf + len - 5, ".keep");
keep_name = keep_name_buf;
}
+ if (verify) {
+ if (!index_name)
+ die("--verify with no packfile name given");
+ read_idx_option(&opts, index_name);
+ opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
+ }
+ if (strict)
+ opts.flags |= WRITE_IDX_STRICT;
curr_pack = open_pack_file(pack_name);
parse_pack_header();
- objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
- deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
+ objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
+ deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
parse_pack_objects(pack_sha1);
if (nr_deltas == nr_resolved_deltas) {
stop_progress(&progress);
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, pack_sha1);
+ curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
free(idx_objects);
- final(pack_name, curr_pack,
- index_name, curr_index,
- keep_name, keep_msg,
- pack_sha1);
+ 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);