static int non_empty;
static int reuse_delta = 1, reuse_object = 1;
static int keep_unreachable, unpack_unreachable, include_tag;
-static unsigned long unpack_unreachable_expiration;
+static timestamp_t unpack_unreachable_expiration;
static int pack_loose_unreachable;
static int local;
static int have_non_local_packs;
void *buf, *base_buf, *delta_buf;
enum object_type type;
- buf = read_sha1_file(entry->idx.sha1, &type, &size);
+ buf = read_sha1_file(entry->idx.oid.hash, &type, &size);
if (!buf)
- die("unable to read %s", sha1_to_hex(entry->idx.sha1));
- base_buf = read_sha1_file(entry->delta->idx.sha1, &type, &base_size);
+ die("unable to read %s", oid_to_hex(&entry->idx.oid));
+ base_buf = read_sha1_file(entry->delta->idx.oid.hash, &type,
+ &base_size);
if (!base_buf)
- die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
+ die("unable to read %s",
+ oid_to_hex(&entry->delta->idx.oid));
delta_buf = diff_delta(base_buf, base_size,
buf, size, &delta_size, 0);
if (!delta_buf || delta_size != entry->delta_size)
unsigned long limit, int usable_delta)
{
unsigned long size, datalen;
- unsigned char header[10], dheader[10];
+ unsigned char header[MAX_PACK_OBJECT_HEADER],
+ dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
enum object_type type;
void *buf;
if (!usable_delta) {
if (entry->type == OBJ_BLOB &&
entry->size > big_file_threshold &&
- (st = open_istream(entry->idx.sha1, &type, &size, NULL)) != NULL)
+ (st = open_istream(entry->idx.oid.hash, &type, &size, NULL)) != NULL)
buf = NULL;
else {
- buf = read_sha1_file(entry->idx.sha1, &type, &size);
+ buf = read_sha1_file(entry->idx.oid.hash, &type,
+ &size);
if (!buf)
- die(_("unable to read %s"), sha1_to_hex(entry->idx.sha1));
+ die(_("unable to read %s"),
+ oid_to_hex(&entry->idx.oid));
}
/*
* make sure no cached delta data remains from a
* The object header is a byte of 'type' followed by zero or
* more bytes of length.
*/
- hdrlen = encode_in_pack_object_header(type, size, header);
+ hdrlen = encode_in_pack_object_header(header, sizeof(header),
+ type, size);
if (type == OBJ_OFS_DELTA) {
/*
return 0;
}
sha1write(f, header, hdrlen);
- sha1write(f, entry->delta->idx.sha1, 20);
+ sha1write(f, entry->delta->idx.oid.hash, 20);
hdrlen += 20;
} else {
if (limit && hdrlen + datalen + 20 >= limit) {
sha1write(f, header, hdrlen);
}
if (st) {
- datalen = write_large_blob_data(st, f, entry->idx.sha1);
+ datalen = write_large_blob_data(st, f, entry->idx.oid.hash);
close_istream(st);
} else {
sha1write(f, buf, datalen);
off_t offset;
enum object_type type = entry->type;
off_t datalen;
- unsigned char header[10], dheader[10];
+ unsigned char header[MAX_PACK_OBJECT_HEADER],
+ dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
if (entry->delta)
type = (allow_ofs_delta && entry->delta->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
- hdrlen = encode_in_pack_object_header(type, entry->size, header);
+ hdrlen = encode_in_pack_object_header(header, sizeof(header),
+ type, entry->size);
offset = entry->in_pack_offset;
revidx = find_pack_revindex(p, offset);
datalen = revidx[1].offset - offset;
if (!pack_to_stdout && p->index_version > 1 &&
check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
- error("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
+ error("bad packed object CRC for %s",
+ oid_to_hex(&entry->idx.oid));
unuse_pack(&w_curs);
return write_no_reuse_object(f, entry, limit, usable_delta);
}
if (!pack_to_stdout && p->index_version == 1 &&
check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
- error("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
+ error("corrupt packed object for %s",
+ oid_to_hex(&entry->idx.oid));
unuse_pack(&w_curs);
return write_no_reuse_object(f, entry, limit, usable_delta);
}
return 0;
}
sha1write(f, header, hdrlen);
- sha1write(f, entry->delta->idx.sha1, 20);
+ sha1write(f, entry->delta->idx.oid.hash, 20);
hdrlen += 20;
reused_delta++;
} else {
recursing = (e->idx.offset == 1);
if (recursing) {
warning("recursive delta detected for object %s",
- sha1_to_hex(e->idx.sha1));
+ oid_to_hex(&e->idx.oid));
return WRITE_ONE_RECURSIVE;
} else if (e->idx.offset || e->preferred_base) {
/* offset is non zero if object is written already. */
written, nr_result);
}
-static void setup_delta_attr_check(struct git_attr_check *check)
-{
- static struct git_attr *attr_delta;
-
- if (!attr_delta)
- attr_delta = git_attr("delta");
-
- check[0].attr = attr_delta;
-}
-
static int no_try_delta(const char *path)
{
- struct git_attr_check check[1];
+ static struct attr_check *check;
- setup_delta_attr_check(check);
- if (git_check_attr(path, ARRAY_SIZE(check), check))
+ if (!check)
+ check = attr_check_initl("delta", NULL);
+ if (git_check_attr(path, check))
return 0;
- if (ATTR_FALSE(check->value))
+ if (ATTR_FALSE(check->items[0].value))
return 1;
return 0;
}
ofs += 1;
if (!ofs || MSB(ofs, 7)) {
error("delta base offset overflow in pack for %s",
- sha1_to_hex(entry->idx.sha1));
+ oid_to_hex(&entry->idx.oid));
goto give_up;
}
c = buf[used_0++];
ofs = entry->in_pack_offset - ofs;
if (ofs <= 0 || ofs >= entry->in_pack_offset) {
error("delta base offset out of bound for %s",
- sha1_to_hex(entry->idx.sha1));
+ oid_to_hex(&entry->idx.oid));
goto give_up;
}
if (reuse_delta && !entry->preferred_base) {
unuse_pack(&w_curs);
}
- entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
+ entry->type = sha1_object_info(entry->idx.oid.hash, &entry->size);
/*
* The error condition is checked in prepare_pack(). This is
* to permit a missing preferred base object to be ignored
/* avoid filesystem trashing with loose objects */
if (!a->in_pack && !b->in_pack)
- return hashcmp(a->idx.sha1, b->idx.sha1);
+ return oidcmp(&a->idx.oid, &b->idx.oid);
if (a->in_pack < b->in_pack)
return -1;
* 2. Updating our size/type to the non-delta representation. These were
* either not recorded initially (size) or overwritten with the delta type
* (type) when check_object() decided to reuse the delta.
+ *
+ * 3. Resetting our delta depth, as we are now a base object.
*/
static void drop_reused_delta(struct object_entry *entry)
{
p = &(*p)->delta_sibling;
}
entry->delta = NULL;
+ entry->depth = 0;
oi.sizep = &entry->size;
oi.typep = &entry->type;
* And if that fails, the error will be recorded in entry->type
* and dealt with in prepare_pack().
*/
- entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
+ entry->type = sha1_object_info(entry->idx.oid.hash,
+ &entry->size);
}
}
* Follow the chain of deltas from this entry onward, throwing away any links
* that cause us to hit a cycle (as determined by the DFS state flags in
* the entries).
+ *
+ * We also detect too-long reused chains that would violate our --depth
+ * limit.
*/
static void break_delta_chains(struct object_entry *entry)
{
- /* If it's not a delta, it can't be part of a cycle. */
- if (!entry->delta) {
- entry->dfs_state = DFS_DONE;
- return;
- }
+ /*
+ * The actual depth of each object we will write is stored as an int,
+ * as it cannot exceed our int "depth" limit. But before we break
+ * changes based no that limit, we may potentially go as deep as the
+ * number of objects, which is elsewhere bounded to a uint32_t.
+ */
+ uint32_t total_depth;
+ struct object_entry *cur, *next;
+
+ for (cur = entry, total_depth = 0;
+ cur;
+ cur = cur->delta, total_depth++) {
+ if (cur->dfs_state == DFS_DONE) {
+ /*
+ * We've already seen this object and know it isn't
+ * part of a cycle. We do need to append its depth
+ * to our count.
+ */
+ total_depth += cur->depth;
+ break;
+ }
- switch (entry->dfs_state) {
- case DFS_NONE:
/*
- * This is the first time we've seen the object. We mark it as
- * part of the active potential cycle and recurse.
+ * We break cycles before looping, so an ACTIVE state (or any
+ * other cruft which made its way into the state variable)
+ * is a bug.
*/
- entry->dfs_state = DFS_ACTIVE;
- break_delta_chains(entry->delta);
- entry->dfs_state = DFS_DONE;
- break;
+ if (cur->dfs_state != DFS_NONE)
+ die("BUG: confusing delta dfs state in first pass: %d",
+ cur->dfs_state);
- case DFS_DONE:
- /* object already examined, and not part of a cycle */
- break;
+ /*
+ * Now we know this is the first time we've seen the object. If
+ * it's not a delta, we're done traversing, but we'll mark it
+ * done to save time on future traversals.
+ */
+ if (!cur->delta) {
+ cur->dfs_state = DFS_DONE;
+ break;
+ }
- case DFS_ACTIVE:
/*
- * We found a cycle that needs broken. It would be correct to
- * break any link in the chain, but it's convenient to
- * break this one.
+ * Mark ourselves as active and see if the next step causes
+ * us to cycle to another active object. It's important to do
+ * this _before_ we loop, because it impacts where we make the
+ * cut, and thus how our total_depth counter works.
+ * E.g., We may see a partial loop like:
+ *
+ * A -> B -> C -> D -> B
+ *
+ * Cutting B->C breaks the cycle. But now the depth of A is
+ * only 1, and our total_depth counter is at 3. The size of the
+ * error is always one less than the size of the cycle we
+ * broke. Commits C and D were "lost" from A's chain.
+ *
+ * If we instead cut D->B, then the depth of A is correct at 3.
+ * We keep all commits in the chain that we examined.
*/
- drop_reused_delta(entry);
- entry->dfs_state = DFS_DONE;
- break;
+ cur->dfs_state = DFS_ACTIVE;
+ if (cur->delta->dfs_state == DFS_ACTIVE) {
+ drop_reused_delta(cur);
+ cur->dfs_state = DFS_DONE;
+ break;
+ }
+ }
+
+ /*
+ * And now that we've gone all the way to the bottom of the chain, we
+ * need to clear the active flags and set the depth fields as
+ * appropriate. Unlike the loop above, which can quit when it drops a
+ * delta, we need to keep going to look for more depth cuts. So we need
+ * an extra "next" pointer to keep going after we reset cur->delta.
+ */
+ for (cur = entry; cur; cur = next) {
+ next = cur->delta;
+
+ /*
+ * We should have a chain of zero or more ACTIVE states down to
+ * a final DONE. We can quit after the DONE, because either it
+ * has no bases, or we've already handled them in a previous
+ * call.
+ */
+ if (cur->dfs_state == DFS_DONE)
+ break;
+ else if (cur->dfs_state != DFS_ACTIVE)
+ die("BUG: confusing delta dfs state in second pass: %d",
+ cur->dfs_state);
+
+ /*
+ * If the total_depth is more than depth, then we need to snip
+ * the chain into two or more smaller chains that don't exceed
+ * the maximum depth. Most of the resulting chains will contain
+ * (depth + 1) entries (i.e., depth deltas plus one base), and
+ * the last chain (i.e., the one containing entry) will contain
+ * whatever entries are left over, namely
+ * (total_depth % (depth + 1)) of them.
+ *
+ * Since we are iterating towards decreasing depth, we need to
+ * decrement total_depth as we go, and we need to write to the
+ * entry what its final depth will be after all of the
+ * snipping. Since we're snipping into chains of length (depth
+ * + 1) entries, the final depth of an entry will be its
+ * original depth modulo (depth + 1). Any time we encounter an
+ * entry whose final depth is supposed to be zero, we snip it
+ * from its delta base, thereby making it so.
+ */
+ cur->depth = (total_depth--) % (depth + 1);
+ if (!cur->depth)
+ drop_reused_delta(cur);
+
+ cur->dfs_state = DFS_DONE;
}
}
/* Load data if not already done */
if (!trg->data) {
read_lock();
- trg->data = read_sha1_file(trg_entry->idx.sha1, &type, &sz);
+ trg->data = read_sha1_file(trg_entry->idx.oid.hash, &type,
+ &sz);
read_unlock();
if (!trg->data)
die("object %s cannot be read",
- sha1_to_hex(trg_entry->idx.sha1));
+ oid_to_hex(&trg_entry->idx.oid));
if (sz != trg_size)
die("object %s inconsistent object length (%lu vs %lu)",
- sha1_to_hex(trg_entry->idx.sha1), sz, trg_size);
+ oid_to_hex(&trg_entry->idx.oid), sz,
+ trg_size);
*mem_usage += sz;
}
if (!src->data) {
read_lock();
- src->data = read_sha1_file(src_entry->idx.sha1, &type, &sz);
+ src->data = read_sha1_file(src_entry->idx.oid.hash, &type,
+ &sz);
read_unlock();
if (!src->data) {
if (src_entry->preferred_base) {
static int warned = 0;
if (!warned++)
warning("object %s cannot be read",
- sha1_to_hex(src_entry->idx.sha1));
+ oid_to_hex(&src_entry->idx.oid));
/*
* Those objects are not included in the
* resulting pack. Be resilient and ignore
return 0;
}
die("object %s cannot be read",
- sha1_to_hex(src_entry->idx.sha1));
+ oid_to_hex(&src_entry->idx.oid));
}
if (sz != src_size)
die("object %s inconsistent object length (%lu vs %lu)",
- sha1_to_hex(src_entry->idx.sha1), sz, src_size);
+ oid_to_hex(&src_entry->idx.oid), sz,
+ src_size);
*mem_usage += sz;
}
if (!src->index) {
if (packlist_find(&to_pack, oid->hash, NULL))
return;
- tag = lookup_tag(oid->hash);
+ tag = lookup_tag(oid);
while (1) {
if (!tag || parse_tag(tag) || !tag->tagged)
die("unable to pack objects reachable from tag %s",
nr_deltas++;
if (entry->type < 0)
die("unable to get type of object %s",
- sha1_to_hex(entry->idx.sha1));
+ oid_to_hex(&entry->idx.oid));
} else {
if (entry->type < 0) {
/*
free(in_pack.array);
}
-static int add_loose_object(const unsigned char *sha1, const char *path,
+static int add_loose_object(const struct object_id *oid, const char *path,
void *data)
{
- enum object_type type = sha1_object_info(sha1, NULL);
+ enum object_type type = sha1_object_info(oid->hash, NULL);
if (type < 0) {
warning("loose object at %s could not be examined", path);
return 0;
}
- add_object_entry(sha1, type, "", 0);
+ add_object_entry(oid->hash, type, "", 0);
return 0;
}
*
* This is filled by get_object_list.
*/
-static struct sha1_array recent_objects;
+static struct oid_array recent_objects;
-static int loosened_object_can_be_discarded(const unsigned char *sha1,
- unsigned long mtime)
+static int loosened_object_can_be_discarded(const struct object_id *oid,
+ timestamp_t mtime)
{
if (!unpack_unreachable_expiration)
return 0;
if (mtime > unpack_unreachable_expiration)
return 0;
- if (sha1_array_lookup(&recent_objects, sha1) >= 0)
+ if (oid_array_lookup(&recent_objects, oid) >= 0)
return 0;
return 1;
}
{
struct packed_git *p;
uint32_t i;
- const unsigned char *sha1;
+ struct object_id oid;
for (p = packed_git; p; p = p->next) {
if (!p->pack_local || p->pack_keep)
die("cannot open pack index");
for (i = 0; i < p->num_objects; i++) {
- sha1 = nth_packed_object_sha1(p, i);
- if (!packlist_find(&to_pack, sha1, NULL) &&
- !has_sha1_pack_kept_or_nonlocal(sha1) &&
- !loosened_object_can_be_discarded(sha1, p->mtime))
- if (force_object_loose(sha1, p->mtime))
+ nth_packed_object_oid(&oid, p, i);
+ if (!packlist_find(&to_pack, oid.hash, NULL) &&
+ !has_sha1_pack_kept_or_nonlocal(oid.hash) &&
+ !loosened_object_can_be_discarded(&oid, p->mtime))
+ if (force_object_loose(oid.hash, p->mtime))
die("unable to force loose object");
}
}
*/
static int pack_options_allow_reuse(void)
{
- return pack_to_stdout && allow_ofs_delta;
+ return pack_to_stdout &&
+ allow_ofs_delta &&
+ !ignore_packed_keep &&
+ (!local || !have_non_local_packs) &&
+ !incremental;
}
static int get_object_list_from_bitmap(struct rev_info *revs)
const char *name,
void *data)
{
- sha1_array_append(&recent_objects, obj->oid.hash);
+ oid_array_append(&recent_objects, &obj->oid);
}
static void record_recent_commit(struct commit *commit, void *data)
{
- sha1_array_append(&recent_objects, commit->object.oid.hash);
+ oid_array_append(&recent_objects, &commit->object.oid);
}
static void get_object_list(int ac, const char **av)
continue;
}
if (starts_with(line, "--shallow ")) {
- unsigned char sha1[20];
- if (get_sha1_hex(line + 10, sha1))
+ struct object_id oid;
+ if (get_oid_hex(line + 10, &oid))
die("not an SHA-1 '%s'", line + 10);
- register_shallow(sha1);
+ register_shallow(&oid);
use_bitmap_index = 0;
continue;
}
if (unpack_unreachable)
loosen_unused_packed_objects(&revs);
- sha1_array_clear(&recent_objects);
+ oid_array_clear(&recent_objects);
}
static int option_parse_index_version(const struct option *opt,