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-rw-r--r--builtin/index-pack.c410
1 files changed, 321 insertions, 89 deletions
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index e40451ffb4..dd1c5c961d 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -11,7 +11,7 @@
#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 pack_idx_entry idx;
@@ -19,6 +19,8 @@ struct object_entry {
unsigned int hdr_size;
enum object_type type;
enum object_type real_type;
+ unsigned delta_depth;
+ int base_object_no;
};
union delta_base {
@@ -32,6 +34,8 @@ struct base_data {
struct object_entry *obj;
void *data;
unsigned long size;
+ int ref_first, ref_last;
+ int ofs_first, ofs_last;
};
/*
@@ -66,6 +70,7 @@ static struct progress *progress;
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;
@@ -169,10 +174,10 @@ static const char *open_pack_file(const char *pack_name)
if (from_stdin) {
input_fd = 0;
if (!pack_name) {
- static char tmpfile[PATH_MAX];
- output_fd = odb_mkstemp(tmpfile, sizeof(tmpfile),
+ static char tmp_file[PATH_MAX];
+ output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
"pack/tmp_pack_XXXXXX");
- pack_name = xstrdup(tmpfile);
+ pack_name = xstrdup(tmp_file);
} else
output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
if (output_fd < 0)
@@ -218,6 +223,15 @@ static NORETURN void bad_object(unsigned long offset, const char *format, ...)
die("pack has bad object at offset %lu: %s", offset, buf);
}
+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) {
@@ -265,7 +279,7 @@ static void unlink_base_data(struct base_data *c)
static void *unpack_entry_data(unsigned long offset, unsigned long size)
{
int status;
- z_stream stream;
+ git_zstream stream;
void *buf = xmalloc(size);
memset(&stream, 0, sizeof(stream));
@@ -355,7 +369,7 @@ 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;
- z_stream stream;
+ git_zstream stream;
int status;
data = xmalloc(obj->size);
@@ -389,7 +403,18 @@ static void *get_data_from_pack(struct object_entry *obj)
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;
@@ -398,7 +423,8 @@ static int find_delta(const union delta_base *base)
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) {
@@ -411,9 +437,10 @@ static int find_delta(const union delta_base *base)
}
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;
@@ -483,14 +510,57 @@ static void sha1_object(const void *data, unsigned long size,
}
}
+static int is_delta_type(enum object_type type)
+{
+ return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
+}
+
+/*
+ * 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;
- if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
- void *base = get_base_data(c->base);
- void *raw = get_data_from_pack(obj);
+ 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;
+ 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,
@@ -498,13 +568,10 @@ static void *get_base_data(struct base_data *c)
free(raw);
if (!c->data)
bad_object(obj->idx.offset, "failed to apply delta");
- } else {
- c->data = get_data_from_pack(obj);
- c->size = obj->size;
+ base_cache_used += c->size;
+ prune_base_data(c);
}
-
- base_cache_used += c->size;
- prune_base_data(c);
+ free(delta);
}
return c->data;
}
@@ -515,6 +582,10 @@ static void resolve_delta(struct object_entry *delta_obj,
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;
@@ -528,63 +599,87 @@ static void resolve_delta(struct object_entry *delta_obj,
nr_resolved_deltas++;
}
-static void find_unresolved_deltas(struct base_data *base,
- struct base_data *prev_base)
+static struct base_data *find_unresolved_deltas_1(struct base_data *base,
+ struct base_data *prev_base)
{
- int i, ref_first, ref_last, ofs_first, ofs_last;
-
- /*
- * This is a recursive function. Those brackets should help reducing
- * stack usage by limiting the scope of the delta_base union.
- */
- {
+ 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, &ref_first, &ref_last);
+ 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, &ofs_first, &ofs_last);
- }
+ find_delta_children(&base_spec,
+ &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
- if (ref_last == -1 && ofs_last == -1) {
- free(base->data);
- return;
+ if (base->ref_last == -1 && base->ofs_last == -1) {
+ free(base->data);
+ return NULL;
+ }
+
+ link_base_data(prev_base, base);
}
- 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();
- 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);
- }
+ 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;
}
- 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);
- }
+ 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;
- 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 */
@@ -608,7 +703,7 @@ static void parse_pack_objects(unsigned char *sha1)
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++;
@@ -653,39 +748,39 @@ static void parse_pack_objects(unsigned char *sha1)
progress = start_progress("Resolving deltas", nr_deltas);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
- struct base_data base_obj;
+ struct base_data *base_obj = alloc_base_data();
- 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;
- find_unresolved_deltas(&base_obj, NULL);
+ base_obj->obj = obj;
+ base_obj->data = NULL;
+ find_unresolved_deltas(base_obj);
display_progress(progress, nr_resolved_deltas);
}
}
static int write_compressed(struct sha1file *f, void *in, unsigned int size)
{
- z_stream stream;
+ git_zstream stream;
int status;
unsigned char outbuf[4096];
memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, zlib_compression_level);
+ 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 = deflate(&stream, Z_FINISH);
+ 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;
- deflateEnd(&stream);
+ git_deflate_end(&stream);
return size;
}
@@ -752,20 +847,20 @@ static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
for (i = 0; i < n; i++) {
struct delta_entry *d = sorted_by_pos[i];
enum object_type type;
- struct base_data base_obj;
+ 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)
+ 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)))
+ if (check_sha1_signature(d->base.sha1, base_obj->data,
+ base_obj->size, typename(type)))
die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
- base_obj.obj = append_obj_to_pack(f, d->base.sha1,
- base_obj.data, base_obj.size, type);
- find_unresolved_deltas(&base_obj, NULL);
+ 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);
@@ -859,24 +954,137 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
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"))
@@ -884,7 +1092,8 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
read_replace_refs = 0;
- git_config(git_index_pack_config, NULL);
+ reset_pack_idx_option(&opts);
+ git_config(git_index_pack_config, &opts);
if (prefix && chdir(prefix))
die("Cannot come back to cwd");
@@ -898,6 +1107,15 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
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=")) {
@@ -923,12 +1141,12 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
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);
@@ -964,11 +1182,19 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
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);
@@ -1008,16 +1234,22 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
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);