die("pack has bad object at offset %lu: %s", offset, buf);
}
+static void free_base_data(struct base_data *c)
+{
+ if (c->data) {
+ free(c->data);
+ c->data = NULL;
+ base_cache_used -= c->size;
+ }
+}
+
static void prune_base_data(struct base_data *retain)
{
struct base_data *b = base_cache;
for (b = base_cache;
base_cache_used > delta_base_cache_limit && b;
b = b->child) {
- if (b->data && b != retain) {
- free(b->data);
- b->data = NULL;
- base_cache_used -= b->size;
- }
+ if (b->data && b != retain)
+ free_base_data(b);
}
}
c->base = base;
c->child = NULL;
- base_cache_used += c->size;
+ if (c->data)
+ base_cache_used += c->size;
prune_base_data(c);
}
base->child = NULL;
else
base_cache = NULL;
- if (c->data) {
- free(c->data);
- base_cache_used -= c->size;
- }
+ free_base_data(c);
}
static void *unpack_entry_data(unsigned long offset, unsigned long size)
return -first-1;
}
-static int find_delta_children(const union delta_base *base,
- int *first_index, int *last_index)
+static void find_delta_children(const union delta_base *base,
+ int *first_index, int *last_index)
{
int first = find_delta(base);
int last = first;
int end = nr_deltas - 1;
- if (first < 0)
- return -1;
+ if (first < 0) {
+ *first_index = 0;
+ *last_index = -1;
+ return;
+ }
while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
--first;
while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
++last;
*first_index = first;
*last_index = last;
- return 0;
}
static void sha1_object(const void *data, unsigned long size,
free(raw);
if (!c->data)
bad_object(obj->idx.offset, "failed to apply delta");
- } else
+ } else {
c->data = get_data_from_pack(obj);
+ c->size = obj->size;
+ }
base_cache_used += c->size;
prune_base_data(c);
}
static void resolve_delta(struct object_entry *delta_obj,
- struct base_data *base_obj, enum object_type type)
+ struct base_data *base, struct base_data *result)
{
- void *delta_data;
- unsigned long delta_size;
- union delta_base delta_base;
- int j, first, last;
- struct base_data result;
+ void *base_data, *delta_data;
- delta_obj->real_type = type;
+ delta_obj->real_type = base->obj->real_type;
delta_data = get_data_from_pack(delta_obj);
- delta_size = delta_obj->size;
- result.data = patch_delta(get_base_data(base_obj), base_obj->size,
- delta_data, delta_size,
- &result.size);
+ base_data = get_base_data(base);
+ result->obj = delta_obj;
+ result->data = patch_delta(base_data, base->size,
+ delta_data, delta_obj->size, &result->size);
free(delta_data);
- if (!result.data)
+ if (!result->data)
bad_object(delta_obj->idx.offset, "failed to apply delta");
- sha1_object(result.data, result.size, type, delta_obj->idx.sha1);
+ sha1_object(result->data, result->size, delta_obj->real_type,
+ delta_obj->idx.sha1);
nr_resolved_deltas++;
+}
+
+static void find_unresolved_deltas(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.
+ */
+ {
+ union delta_base base_spec;
+
+ hashcpy(base_spec.sha1, base->obj->idx.sha1);
+ find_delta_children(&base_spec, &ref_first, &ref_last);
+
+ memset(&base_spec, 0, sizeof(base_spec));
+ base_spec.offset = base->obj->idx.offset;
+ find_delta_children(&base_spec, &ofs_first, &ofs_last);
+ }
- result.obj = delta_obj;
- link_base_data(base_obj, &result);
+ if (ref_last == -1 && ofs_last == -1) {
+ free(base->data);
+ return;
+ }
+
+ link_base_data(prev_base, base);
- hashcpy(delta_base.sha1, delta_obj->idx.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, type);
+ 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);
}
}
- memset(&delta_base, 0, sizeof(delta_base));
- delta_base.offset = delta_obj->idx.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, type);
+ 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);
}
}
- unlink_base_data(&result);
+ unlink_base_data(base);
}
static int compare_delta_entry(const void *a, const void *b)
progress = start_progress("Resolving deltas", nr_deltas);
for (i = 0; i < nr_objects; i++) {
struct object_entry *obj = &objects[i];
- union delta_base base;
- int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
struct base_data base_obj;
if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
continue;
- hashcpy(base.sha1, obj->idx.sha1);
- ref = !find_delta_children(&base, &ref_first, &ref_last);
- memset(&base, 0, sizeof(base));
- base.offset = obj->idx.offset;
- ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
- if (!ref && !ofs)
- continue;
- base_obj.data = get_data_from_pack(obj);
- base_obj.size = obj->size;
base_obj.obj = obj;
- link_base_data(NULL, &base_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, &base_obj, 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, &base_obj, obj->type);
- }
- unlink_base_data(&base_obj);
+ base_obj.data = NULL;
+ find_unresolved_deltas(&base_obj, NULL);
display_progress(progress, nr_resolved_deltas);
}
}
for (i = 0; i < n; i++) {
struct delta_entry *d = sorted_by_pos[i];
enum object_type type;
- int j, first, last;
struct base_data base_obj;
if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
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);
- link_base_data(NULL, &base_obj);
-
- 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, &base_obj, type);
- }
-
- unlink_base_data(&base_obj);
+ find_unresolved_deltas(&base_obj, NULL);
display_progress(progress, nr_resolved_deltas);
}
free(sorted_by_pos);
'rm -rf .git
git init &&
i=1 &&
- while test $i -le 100
+ while test $i -le 100
do
- i=`printf '%03i' $i`
- echo $i >file_$i &&
- test-genrandom "$i" 8192 >>file_$i &&
- git update-index --add file_$i &&
- i=`expr $i + 1` || return 1
+ iii=`printf '%03i' $i`
+ test-genrandom "bar" 200 > wide_delta_$iii &&
+ test-genrandom "baz $iii" 50 >> wide_delta_$iii &&
+ test-genrandom "foo"$i 100 > deep_delta_$iii &&
+ test-genrandom "foo"`expr $i + 1` 100 >> deep_delta_$iii &&
+ test-genrandom "foo"`expr $i + 2` 100 >> deep_delta_$iii &&
+ echo $iii >file_$iii &&
+ test-genrandom "$iii" 8192 >>file_$iii &&
+ git update-index --add file_$iii deep_delta_$iii wide_delta_$iii &&
+ i=`expr $i + 1` || return 1
done &&
{ echo 101 && test-genrandom 100 8192; } >file_101 &&
git update-index --add file_101 &&
'64-bit offsets: index-pack result should match pack-objects one' \
'cmp "test-3-${pack3}.idx" "3.idx"'
+# returns the object number for given object in given pack index
+index_obj_nr()
+{
+ idx_file=$1
+ object_sha1=$2
+ nr=0
+ git show-index < $idx_file |
+ while read offs sha1 extra
+ do
+ nr=$(($nr + 1))
+ test "$sha1" = "$object_sha1" || continue
+ echo "$(($nr - 1))"
+ break
+ done
+}
+
+# returns the pack offset for given object as found in given pack index
+index_obj_offset()
+{
+ idx_file=$1
+ object_sha1=$2
+ git show-index < $idx_file | grep $object_sha1 |
+ ( read offs extra && echo "$offs" )
+}
+
test_expect_success \
'[index v1] 1) stream pack to repository' \
'git index-pack --index-version=1 --stdin < "test-1-${pack1}.pack" &&
test_expect_success \
'[index v1] 2) create a stealth corruption in a delta base reference' \
- '# this test assumes a delta smaller than 16 bytes at the end of the pack
- git show-index <1.idx | sort -n | sed -ne \$p | (
- read delta_offs delta_sha1 &&
- git cat-file blob "$delta_sha1" > blob_1 &&
- chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
- dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($delta_offs + 1)) \
- if=".git/objects/pack/pack-${pack1}.idx" skip=$((256 * 4 + 4)) \
- bs=1 count=20 conv=notrunc &&
- git cat-file blob "$delta_sha1" > blob_2 )'
+ '# This test assumes file_101 is a delta smaller than 16 bytes.
+ # It should be against file_100 but we substitute its base for file_099
+ sha1_101=`git hash-object file_101` &&
+ sha1_099=`git hash-object file_099` &&
+ offs_101=`index_obj_offset 1.idx $sha1_101` &&
+ nr_099=`index_obj_nr 1.idx $sha1_099` &&
+ chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
+ dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($offs_101 + 1)) \
+ if=".git/objects/pack/pack-${pack1}.idx" \
+ skip=$((4 + 256 * 4 + $nr_099 * 24)) \
+ bs=1 count=20 conv=notrunc &&
+ git cat-file blob $sha1_101 > file_101_foo1'
test_expect_success \
'[index v1] 3) corrupted delta happily returned wrong data' \
- '! cmp blob_1 blob_2'
+ 'test -f file_101_foo1 && ! cmp file_101 file_101_foo1'
test_expect_success \
'[index v1] 4) confirm that the pack is actually corrupted' \
test_expect_success \
'[index v2] 2) create a stealth corruption in a delta base reference' \
- '# this test assumes a delta smaller than 16 bytes at the end of the pack
- git show-index <1.idx | sort -n | sed -ne \$p | (
- read delta_offs delta_sha1 delta_crc &&
- git cat-file blob "$delta_sha1" > blob_3 &&
- chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
- dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($delta_offs + 1)) \
- if=".git/objects/pack/pack-${pack1}.idx" skip=$((8 + 256 * 4)) \
- bs=1 count=20 conv=notrunc &&
- git cat-file blob "$delta_sha1" > blob_4 )'
+ '# This test assumes file_101 is a delta smaller than 16 bytes.
+ # It should be against file_100 but we substitute its base for file_099
+ sha1_101=`git hash-object file_101` &&
+ sha1_099=`git hash-object file_099` &&
+ offs_101=`index_obj_offset 1.idx $sha1_101` &&
+ nr_099=`index_obj_nr 1.idx $sha1_099` &&
+ chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
+ dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($offs_101 + 1)) \
+ if=".git/objects/pack/pack-${pack1}.idx" \
+ skip=$((8 + 256 * 4 + $nr_099 * 20)) \
+ bs=1 count=20 conv=notrunc &&
+ git cat-file blob $sha1_101 > file_101_foo2'
test_expect_success \
'[index v2] 3) corrupted delta happily returned wrong data' \
- '! cmp blob_3 blob_4'
+ 'test -f file_101_foo2 && ! cmp file_101 file_101_foo2'
test_expect_success \
'[index v2] 4) confirm that the pack is actually corrupted' \
'rm -f .git/objects/pack/* &&
git index-pack --index-version=2 --stdin < "test-1-${pack1}.pack" &&
git verify-pack ".git/objects/pack/pack-${pack1}.pack" &&
+ obj=`git hash-object file_001` &&
+ nr=`index_obj_nr ".git/objects/pack/pack-${pack1}.idx" $obj` &&
chmod +w ".git/objects/pack/pack-${pack1}.idx" &&
dd if=/dev/zero of=".git/objects/pack/pack-${pack1}.idx" conv=notrunc \
- bs=1 count=4 seek=$((8 + 256 * 4 + `wc -l <obj-list` * 20 + 0)) &&
+ bs=1 count=4 seek=$((8 + 256 * 4 + `wc -l <obj-list` * 20 + $nr * 4)) &&
( while read obj
do git cat-file -p $obj >/dev/null || exit 1
done <obj-list ) &&