mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
The codepath around object-info API has been taught to take the repository object (which in turn tells the API which object store the objects are to be located). * sb/oid-object-info: cache.h: allow oid_object_info to handle arbitrary repositories packfile: add repository argument to cache_or_unpack_entry packfile: add repository argument to unpack_entry packfile: add repository argument to read_object packfile: add repository argument to packed_object_info packfile: add repository argument to packed_to_object_type packfile: add repository argument to retry_bad_packed_offset cache.h: add repository argument to oid_object_info cache.h: add repository argument to oid_object_info_extended
494 lines
11 KiB
C
494 lines
11 KiB
C
#include "cache.h"
|
|
#include "object.h"
|
|
#include "replace-object.h"
|
|
#include "blob.h"
|
|
#include "tree.h"
|
|
#include "commit.h"
|
|
#include "tag.h"
|
|
#include "object-store.h"
|
|
#include "packfile.h"
|
|
|
|
static struct object **obj_hash;
|
|
static int nr_objs, obj_hash_size;
|
|
|
|
unsigned int get_max_object_index(void)
|
|
{
|
|
return obj_hash_size;
|
|
}
|
|
|
|
struct object *get_indexed_object(unsigned int idx)
|
|
{
|
|
return obj_hash[idx];
|
|
}
|
|
|
|
static const char *object_type_strings[] = {
|
|
NULL, /* OBJ_NONE = 0 */
|
|
"commit", /* OBJ_COMMIT = 1 */
|
|
"tree", /* OBJ_TREE = 2 */
|
|
"blob", /* OBJ_BLOB = 3 */
|
|
"tag", /* OBJ_TAG = 4 */
|
|
};
|
|
|
|
const char *type_name(unsigned int type)
|
|
{
|
|
if (type >= ARRAY_SIZE(object_type_strings))
|
|
return NULL;
|
|
return object_type_strings[type];
|
|
}
|
|
|
|
int type_from_string_gently(const char *str, ssize_t len, int gentle)
|
|
{
|
|
int i;
|
|
|
|
if (len < 0)
|
|
len = strlen(str);
|
|
|
|
for (i = 1; i < ARRAY_SIZE(object_type_strings); i++)
|
|
if (!strncmp(str, object_type_strings[i], len) &&
|
|
object_type_strings[i][len] == '\0')
|
|
return i;
|
|
|
|
if (gentle)
|
|
return -1;
|
|
|
|
die("invalid object type \"%s\"", str);
|
|
}
|
|
|
|
/*
|
|
* Return a numerical hash value between 0 and n-1 for the object with
|
|
* the specified sha1. n must be a power of 2. Please note that the
|
|
* return value is *not* consistent across computer architectures.
|
|
*/
|
|
static unsigned int hash_obj(const unsigned char *sha1, unsigned int n)
|
|
{
|
|
return sha1hash(sha1) & (n - 1);
|
|
}
|
|
|
|
/*
|
|
* Insert obj into the hash table hash, which has length size (which
|
|
* must be a power of 2). On collisions, simply overflow to the next
|
|
* empty bucket.
|
|
*/
|
|
static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
|
|
{
|
|
unsigned int j = hash_obj(obj->oid.hash, size);
|
|
|
|
while (hash[j]) {
|
|
j++;
|
|
if (j >= size)
|
|
j = 0;
|
|
}
|
|
hash[j] = obj;
|
|
}
|
|
|
|
/*
|
|
* Look up the record for the given sha1 in the hash map stored in
|
|
* obj_hash. Return NULL if it was not found.
|
|
*/
|
|
struct object *lookup_object(const unsigned char *sha1)
|
|
{
|
|
unsigned int i, first;
|
|
struct object *obj;
|
|
|
|
if (!obj_hash)
|
|
return NULL;
|
|
|
|
first = i = hash_obj(sha1, obj_hash_size);
|
|
while ((obj = obj_hash[i]) != NULL) {
|
|
if (!hashcmp(sha1, obj->oid.hash))
|
|
break;
|
|
i++;
|
|
if (i == obj_hash_size)
|
|
i = 0;
|
|
}
|
|
if (obj && i != first) {
|
|
/*
|
|
* Move object to where we started to look for it so
|
|
* that we do not need to walk the hash table the next
|
|
* time we look for it.
|
|
*/
|
|
SWAP(obj_hash[i], obj_hash[first]);
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
/*
|
|
* Increase the size of the hash map stored in obj_hash to the next
|
|
* power of 2 (but at least 32). Copy the existing values to the new
|
|
* hash map.
|
|
*/
|
|
static void grow_object_hash(void)
|
|
{
|
|
int i;
|
|
/*
|
|
* Note that this size must always be power-of-2 to match hash_obj
|
|
* above.
|
|
*/
|
|
int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
|
|
struct object **new_hash;
|
|
|
|
new_hash = xcalloc(new_hash_size, sizeof(struct object *));
|
|
for (i = 0; i < obj_hash_size; i++) {
|
|
struct object *obj = obj_hash[i];
|
|
if (!obj)
|
|
continue;
|
|
insert_obj_hash(obj, new_hash, new_hash_size);
|
|
}
|
|
free(obj_hash);
|
|
obj_hash = new_hash;
|
|
obj_hash_size = new_hash_size;
|
|
}
|
|
|
|
void *create_object(const unsigned char *sha1, void *o)
|
|
{
|
|
struct object *obj = o;
|
|
|
|
obj->parsed = 0;
|
|
obj->flags = 0;
|
|
hashcpy(obj->oid.hash, sha1);
|
|
|
|
if (obj_hash_size - 1 <= nr_objs * 2)
|
|
grow_object_hash();
|
|
|
|
insert_obj_hash(obj, obj_hash, obj_hash_size);
|
|
nr_objs++;
|
|
return obj;
|
|
}
|
|
|
|
void *object_as_type(struct object *obj, enum object_type type, int quiet)
|
|
{
|
|
if (obj->type == type)
|
|
return obj;
|
|
else if (obj->type == OBJ_NONE) {
|
|
if (type == OBJ_COMMIT)
|
|
((struct commit *)obj)->index = alloc_commit_index();
|
|
obj->type = type;
|
|
return obj;
|
|
}
|
|
else {
|
|
if (!quiet)
|
|
error("object %s is a %s, not a %s",
|
|
oid_to_hex(&obj->oid),
|
|
type_name(obj->type), type_name(type));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
struct object *lookup_unknown_object(const unsigned char *sha1)
|
|
{
|
|
struct object *obj = lookup_object(sha1);
|
|
if (!obj)
|
|
obj = create_object(sha1, alloc_object_node());
|
|
return obj;
|
|
}
|
|
|
|
struct object *parse_object_buffer(const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
|
|
{
|
|
struct object *obj;
|
|
*eaten_p = 0;
|
|
|
|
obj = NULL;
|
|
if (type == OBJ_BLOB) {
|
|
struct blob *blob = lookup_blob(oid);
|
|
if (blob) {
|
|
if (parse_blob_buffer(blob, buffer, size))
|
|
return NULL;
|
|
obj = &blob->object;
|
|
}
|
|
} else if (type == OBJ_TREE) {
|
|
struct tree *tree = lookup_tree(oid);
|
|
if (tree) {
|
|
obj = &tree->object;
|
|
if (!tree->buffer)
|
|
tree->object.parsed = 0;
|
|
if (!tree->object.parsed) {
|
|
if (parse_tree_buffer(tree, buffer, size))
|
|
return NULL;
|
|
*eaten_p = 1;
|
|
}
|
|
}
|
|
} else if (type == OBJ_COMMIT) {
|
|
struct commit *commit = lookup_commit(oid);
|
|
if (commit) {
|
|
if (parse_commit_buffer(commit, buffer, size))
|
|
return NULL;
|
|
if (!get_cached_commit_buffer(commit, NULL)) {
|
|
set_commit_buffer(commit, buffer, size);
|
|
*eaten_p = 1;
|
|
}
|
|
obj = &commit->object;
|
|
}
|
|
} else if (type == OBJ_TAG) {
|
|
struct tag *tag = lookup_tag(oid);
|
|
if (tag) {
|
|
if (parse_tag_buffer(tag, buffer, size))
|
|
return NULL;
|
|
obj = &tag->object;
|
|
}
|
|
} else {
|
|
warning("object %s has unknown type id %d", oid_to_hex(oid), type);
|
|
obj = NULL;
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
struct object *parse_object_or_die(const struct object_id *oid,
|
|
const char *name)
|
|
{
|
|
struct object *o = parse_object(oid);
|
|
if (o)
|
|
return o;
|
|
|
|
die(_("unable to parse object: %s"), name ? name : oid_to_hex(oid));
|
|
}
|
|
|
|
struct object *parse_object(const struct object_id *oid)
|
|
{
|
|
unsigned long size;
|
|
enum object_type type;
|
|
int eaten;
|
|
const struct object_id *repl = lookup_replace_object(the_repository, oid);
|
|
void *buffer;
|
|
struct object *obj;
|
|
|
|
obj = lookup_object(oid->hash);
|
|
if (obj && obj->parsed)
|
|
return obj;
|
|
|
|
if ((obj && obj->type == OBJ_BLOB && has_object_file(oid)) ||
|
|
(!obj && has_object_file(oid) &&
|
|
oid_object_info(the_repository, oid, NULL) == OBJ_BLOB)) {
|
|
if (check_object_signature(repl, NULL, 0, NULL) < 0) {
|
|
error("sha1 mismatch %s", oid_to_hex(oid));
|
|
return NULL;
|
|
}
|
|
parse_blob_buffer(lookup_blob(oid), NULL, 0);
|
|
return lookup_object(oid->hash);
|
|
}
|
|
|
|
buffer = read_object_file(oid, &type, &size);
|
|
if (buffer) {
|
|
if (check_object_signature(repl, buffer, size, type_name(type)) < 0) {
|
|
free(buffer);
|
|
error("sha1 mismatch %s", oid_to_hex(repl));
|
|
return NULL;
|
|
}
|
|
|
|
obj = parse_object_buffer(oid, type, size, buffer, &eaten);
|
|
if (!eaten)
|
|
free(buffer);
|
|
return obj;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct object_list *object_list_insert(struct object *item,
|
|
struct object_list **list_p)
|
|
{
|
|
struct object_list *new_list = xmalloc(sizeof(struct object_list));
|
|
new_list->item = item;
|
|
new_list->next = *list_p;
|
|
*list_p = new_list;
|
|
return new_list;
|
|
}
|
|
|
|
int object_list_contains(struct object_list *list, struct object *obj)
|
|
{
|
|
while (list) {
|
|
if (list->item == obj)
|
|
return 1;
|
|
list = list->next;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* A zero-length string to which object_array_entry::name can be
|
|
* initialized without requiring a malloc/free.
|
|
*/
|
|
static char object_array_slopbuf[1];
|
|
|
|
void add_object_array_with_path(struct object *obj, const char *name,
|
|
struct object_array *array,
|
|
unsigned mode, const char *path)
|
|
{
|
|
unsigned nr = array->nr;
|
|
unsigned alloc = array->alloc;
|
|
struct object_array_entry *objects = array->objects;
|
|
struct object_array_entry *entry;
|
|
|
|
if (nr >= alloc) {
|
|
alloc = (alloc + 32) * 2;
|
|
REALLOC_ARRAY(objects, alloc);
|
|
array->alloc = alloc;
|
|
array->objects = objects;
|
|
}
|
|
entry = &objects[nr];
|
|
entry->item = obj;
|
|
if (!name)
|
|
entry->name = NULL;
|
|
else if (!*name)
|
|
/* Use our own empty string instead of allocating one: */
|
|
entry->name = object_array_slopbuf;
|
|
else
|
|
entry->name = xstrdup(name);
|
|
entry->mode = mode;
|
|
if (path)
|
|
entry->path = xstrdup(path);
|
|
else
|
|
entry->path = NULL;
|
|
array->nr = ++nr;
|
|
}
|
|
|
|
void add_object_array(struct object *obj, const char *name, struct object_array *array)
|
|
{
|
|
add_object_array_with_path(obj, name, array, S_IFINVALID, NULL);
|
|
}
|
|
|
|
/*
|
|
* Free all memory associated with an entry; the result is
|
|
* in an unspecified state and should not be examined.
|
|
*/
|
|
static void object_array_release_entry(struct object_array_entry *ent)
|
|
{
|
|
if (ent->name != object_array_slopbuf)
|
|
free(ent->name);
|
|
free(ent->path);
|
|
}
|
|
|
|
struct object *object_array_pop(struct object_array *array)
|
|
{
|
|
struct object *ret;
|
|
|
|
if (!array->nr)
|
|
return NULL;
|
|
|
|
ret = array->objects[array->nr - 1].item;
|
|
object_array_release_entry(&array->objects[array->nr - 1]);
|
|
array->nr--;
|
|
return ret;
|
|
}
|
|
|
|
void object_array_filter(struct object_array *array,
|
|
object_array_each_func_t want, void *cb_data)
|
|
{
|
|
unsigned nr = array->nr, src, dst;
|
|
struct object_array_entry *objects = array->objects;
|
|
|
|
for (src = dst = 0; src < nr; src++) {
|
|
if (want(&objects[src], cb_data)) {
|
|
if (src != dst)
|
|
objects[dst] = objects[src];
|
|
dst++;
|
|
} else {
|
|
object_array_release_entry(&objects[src]);
|
|
}
|
|
}
|
|
array->nr = dst;
|
|
}
|
|
|
|
void object_array_clear(struct object_array *array)
|
|
{
|
|
int i;
|
|
for (i = 0; i < array->nr; i++)
|
|
object_array_release_entry(&array->objects[i]);
|
|
FREE_AND_NULL(array->objects);
|
|
array->nr = array->alloc = 0;
|
|
}
|
|
|
|
/*
|
|
* Return true iff array already contains an entry with name.
|
|
*/
|
|
static int contains_name(struct object_array *array, const char *name)
|
|
{
|
|
unsigned nr = array->nr, i;
|
|
struct object_array_entry *object = array->objects;
|
|
|
|
for (i = 0; i < nr; i++, object++)
|
|
if (!strcmp(object->name, name))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
void object_array_remove_duplicates(struct object_array *array)
|
|
{
|
|
unsigned nr = array->nr, src;
|
|
struct object_array_entry *objects = array->objects;
|
|
|
|
array->nr = 0;
|
|
for (src = 0; src < nr; src++) {
|
|
if (!contains_name(array, objects[src].name)) {
|
|
if (src != array->nr)
|
|
objects[array->nr] = objects[src];
|
|
array->nr++;
|
|
} else {
|
|
object_array_release_entry(&objects[src]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void clear_object_flags(unsigned flags)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < obj_hash_size; i++) {
|
|
struct object *obj = obj_hash[i];
|
|
if (obj)
|
|
obj->flags &= ~flags;
|
|
}
|
|
}
|
|
|
|
void clear_commit_marks_all(unsigned int flags)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < obj_hash_size; i++) {
|
|
struct object *obj = obj_hash[i];
|
|
if (obj && obj->type == OBJ_COMMIT)
|
|
obj->flags &= ~flags;
|
|
}
|
|
}
|
|
|
|
struct raw_object_store *raw_object_store_new(void)
|
|
{
|
|
struct raw_object_store *o = xmalloc(sizeof(*o));
|
|
|
|
memset(o, 0, sizeof(*o));
|
|
INIT_LIST_HEAD(&o->packed_git_mru);
|
|
return o;
|
|
}
|
|
|
|
static void free_alt_odb(struct alternate_object_database *alt)
|
|
{
|
|
strbuf_release(&alt->scratch);
|
|
oid_array_clear(&alt->loose_objects_cache);
|
|
free(alt);
|
|
}
|
|
|
|
static void free_alt_odbs(struct raw_object_store *o)
|
|
{
|
|
while (o->alt_odb_list) {
|
|
struct alternate_object_database *next;
|
|
|
|
next = o->alt_odb_list->next;
|
|
free_alt_odb(o->alt_odb_list);
|
|
o->alt_odb_list = next;
|
|
}
|
|
}
|
|
|
|
void raw_object_store_clear(struct raw_object_store *o)
|
|
{
|
|
FREE_AND_NULL(o->objectdir);
|
|
FREE_AND_NULL(o->alternate_db);
|
|
|
|
oidmap_free(o->replace_map, 1);
|
|
FREE_AND_NULL(o->replace_map);
|
|
|
|
free_alt_odbs(o);
|
|
o->alt_odb_tail = NULL;
|
|
|
|
INIT_LIST_HEAD(&o->packed_git_mru);
|
|
close_all_packs(o);
|
|
o->packed_git = NULL;
|
|
}
|