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unpack-objects: fix --strict handling

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Earlier attempt (which was reverted) called added_object() (by the way,
the function should be renamed to resolve_dependents() --- it is called
when we have a complete object data, and is responsible to resolve pending
deltified objects that use this object as their delta base object) without
updating obj_list[nr].sha1 with the correct value.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2008-03-04 23:46:51 -08:00
parent c0e809e5c0
commit f2898cfadc
2 changed files with 58 additions and 17 deletions
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73
builtin-unpack-objects.c
View File

@ -21,6 +21,11 @@ static unsigned int offset, len;
static off_t consumed_bytes;
static SHA_CTX ctx;
/*
* When running under --strict mode, objects whose reachability are
* suspect are kept in core without getting written in the object
* store.
*/
struct obj_buffer {
char *buffer;
unsigned long size;
@ -155,6 +160,10 @@ struct obj_info {
static struct obj_info *obj_list;
unsigned nr_objects;
/*
* Called only from check_object() after it verified this object
* is Ok.
*/
static void write_cached_object(struct object *obj)
{
unsigned char sha1[20];
@ -164,6 +173,11 @@ static void write_cached_object(struct object *obj)
obj->flags |= FLAG_WRITTEN;
}
/*
* At the very end of the processing, write_rest() scans the objects
* that have reachability requirements and calls this function.
* Verify its reachability and validity recursively and write it out.
*/
static int check_object(struct object *obj, int type, void *data)
{
if (!obj)
@ -202,19 +216,25 @@ static void write_rest(void)
static void added_object(unsigned nr, enum object_type type,
void *data, unsigned long size);
/*
* Write out nr-th object from the list, now we know the contents
* of it. Under --strict, this buffers structured objects in-core,
* to be checked at the end.
*/
static void write_object(unsigned nr, enum object_type type,
void *buf, unsigned long size)
{
added_object(nr, type, buf, size);
if (!strict) {
if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
die("failed to write object");
added_object(nr, type, buf, size);
free(buf);
obj_list[nr].obj = 0;
obj_list[nr].obj = NULL;
} else if (type == OBJ_BLOB) {
struct blob *blob;
if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
die("failed to write object");
added_object(nr, type, buf, size);
free(buf);
blob = lookup_blob(obj_list[nr].sha1);
@ -222,15 +242,15 @@ static void write_object(unsigned nr, enum object_type type,
blob->object.flags |= FLAG_WRITTEN;
else
die("invalid blob object");
obj_list[nr].obj = 0;
obj_list[nr].obj = NULL;
} else {
struct object *obj;
int eaten;
hash_sha1_file(buf, size, typename(type), obj_list[nr].sha1);
added_object(nr, type, buf, size);
obj = parse_object_buffer(obj_list[nr].sha1, type, size, buf, &eaten);
if (!obj)
die("invalid %s", typename(type));
/* buf is stored via add_object_buffer and in obj, if its a tree or commit */
add_object_buffer(obj, buf, size);
obj->flags |= FLAG_OPEN;
obj_list[nr].obj = obj;
@ -253,6 +273,10 @@ static void resolve_delta(unsigned nr, enum object_type type,
write_object(nr, type, result, result_size);
}
/*
* We now know the contents of an object (which is nr-th in the pack);
* resolve all the deltified objects that are based on it.
*/
static void added_object(unsigned nr, enum object_type type,
void *data, unsigned long size)
{
@ -284,13 +308,28 @@ static void unpack_non_delta_entry(enum object_type type, unsigned long size,
free(buf);
}
static int resolve_against_held(unsigned nr, const unsigned char *base,
void *delta_data, unsigned long delta_size)
{
struct object *obj;
struct obj_buffer *obj_buffer;
obj = lookup_object(base);
if (!obj)
return 0;
obj_buffer = lookup_object_buffer(obj);
if (!obj_buffer)
return 0;
resolve_delta(nr, obj->type, obj_buffer->buffer,
obj_buffer->size, delta_data, delta_size);
return 1;
}
static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
unsigned nr)
{
void *delta_data, *base;
unsigned long base_size;
unsigned char base_sha1[20];
struct object *obj;
if (type == OBJ_REF_DELTA) {
hashcpy(base_sha1, fill(20));
@ -300,7 +339,13 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
free(delta_data);
return;
}
if (!has_sha1_file(base_sha1)) {
if (has_sha1_file(base_sha1))
; /* Ok we have this one */
else if (resolve_against_held(nr, base_sha1,
delta_data, delta_size))
return; /* we are done */
else {
/* cannot resolve yet --- queue it */
hashcpy(obj_list[nr].sha1, null_sha1);
add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size);
return;
@ -346,22 +391,18 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
}
}
if (!base_found) {
/* The delta base object is itself a delta that
has not been resolved yet. */
/*
* The delta base object is itself a delta that
* has not been resolved yet.
*/
hashcpy(obj_list[nr].sha1, null_sha1);
add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size);
return;
}
}
obj = lookup_object(base_sha1);
if (obj) {
struct obj_buffer *obj_buf = lookup_object_buffer(obj);
if (obj_buf) {
resolve_delta(nr, obj->type, obj_buf->buffer, obj_buf->size, delta_data, delta_size);
return;
}
}
if (resolve_against_held(nr, base_sha1, delta_data, delta_size))
return;
base = read_sha1_file(base_sha1, &type, &base_size);
if (!base) {

2
t/t5300-pack-object.sh
View File

@ -274,7 +274,7 @@ test_expect_success \
packname_4=$(git pack-objects test-4 <obj-list) &&
test 3 = $(ls test-4-*.pack | wc -l)'
test_expect_failure 'unpacking with --strict' '
test_expect_success 'unpacking with --strict' '
git config --unset pack.packsizelimit &&
for j in a b c d e f g