mirror of
https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
![brian m. carlson](/assets/img/avatar_default.png)
This member is used to represent the pack checksum of the pack in question. Expand this member to be GIT_MAX_RAWSZ bytes in length so it works with longer hashes and rename it to be "hash" instead of "sha1". This transformation was made with a change to the definition and the following semantic patch: @@ struct packed_git *E1; @@ - E1->sha1 + E1->hash @@ struct packed_git E1; @@ - E1.sha1 + E1.hash Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
654 lines
15 KiB
C
654 lines
15 KiB
C
/*
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*
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* Copyright 2005, Lukas Sandstrom <lukass@etek.chalmers.se>
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*
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* This file is licensed under the GPL v2.
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*
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*/
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#include "builtin.h"
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#include "repository.h"
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#include "packfile.h"
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#include "object-store.h"
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#define BLKSIZE 512
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static const char pack_redundant_usage[] =
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"git pack-redundant [--verbose] [--alt-odb] (--all | <filename.pack>...)";
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static int load_all_packs, verbose, alt_odb;
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struct llist_item {
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struct llist_item *next;
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const struct object_id *oid;
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};
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static struct llist {
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struct llist_item *front;
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struct llist_item *back;
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size_t size;
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} *all_objects; /* all objects which must be present in local packfiles */
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static struct pack_list {
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struct pack_list *next;
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struct packed_git *pack;
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struct llist *unique_objects;
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struct llist *remaining_objects;
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size_t all_objects_size;
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} *local_packs = NULL, *altodb_packs = NULL;
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static struct llist_item *free_nodes;
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static inline void llist_item_put(struct llist_item *item)
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{
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item->next = free_nodes;
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free_nodes = item;
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}
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static inline struct llist_item *llist_item_get(void)
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{
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struct llist_item *new_item;
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if ( free_nodes ) {
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new_item = free_nodes;
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free_nodes = free_nodes->next;
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} else {
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int i = 1;
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ALLOC_ARRAY(new_item, BLKSIZE);
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for (; i < BLKSIZE; i++)
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llist_item_put(&new_item[i]);
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}
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return new_item;
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}
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static inline void llist_init(struct llist **list)
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{
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*list = xmalloc(sizeof(struct llist));
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(*list)->front = (*list)->back = NULL;
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(*list)->size = 0;
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}
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static struct llist * llist_copy(struct llist *list)
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{
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struct llist *ret;
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struct llist_item *new_item, *old_item, *prev;
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llist_init(&ret);
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if ((ret->size = list->size) == 0)
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return ret;
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new_item = ret->front = llist_item_get();
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new_item->oid = list->front->oid;
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old_item = list->front->next;
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while (old_item) {
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prev = new_item;
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new_item = llist_item_get();
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prev->next = new_item;
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new_item->oid = old_item->oid;
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old_item = old_item->next;
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}
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new_item->next = NULL;
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ret->back = new_item;
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return ret;
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}
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static inline struct llist_item *llist_insert(struct llist *list,
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struct llist_item *after,
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const struct object_id *oid)
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{
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struct llist_item *new_item = llist_item_get();
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new_item->oid = oid;
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new_item->next = NULL;
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if (after != NULL) {
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new_item->next = after->next;
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after->next = new_item;
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if (after == list->back)
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list->back = new_item;
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} else {/* insert in front */
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if (list->size == 0)
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list->back = new_item;
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else
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new_item->next = list->front;
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list->front = new_item;
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}
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list->size++;
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return new_item;
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}
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static inline struct llist_item *llist_insert_back(struct llist *list,
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const struct object_id *oid)
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{
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return llist_insert(list, list->back, oid);
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}
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static inline struct llist_item *llist_insert_sorted_unique(struct llist *list,
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const struct object_id *oid, struct llist_item *hint)
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{
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struct llist_item *prev = NULL, *l;
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l = (hint == NULL) ? list->front : hint;
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while (l) {
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int cmp = oidcmp(l->oid, oid);
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if (cmp > 0) { /* we insert before this entry */
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return llist_insert(list, prev, oid);
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}
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if (!cmp) { /* already exists */
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return l;
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}
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prev = l;
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l = l->next;
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}
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/* insert at the end */
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return llist_insert_back(list, oid);
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}
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/* returns a pointer to an item in front of sha1 */
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static inline struct llist_item * llist_sorted_remove(struct llist *list, const struct object_id *oid, struct llist_item *hint)
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{
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struct llist_item *prev, *l;
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redo_from_start:
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l = (hint == NULL) ? list->front : hint;
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prev = NULL;
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while (l) {
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const int cmp = oidcmp(l->oid, oid);
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if (cmp > 0) /* not in list, since sorted */
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return prev;
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if (!cmp) { /* found */
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if (prev == NULL) {
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if (hint != NULL && hint != list->front) {
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/* we don't know the previous element */
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hint = NULL;
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goto redo_from_start;
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}
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list->front = l->next;
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} else
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prev->next = l->next;
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if (l == list->back)
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list->back = prev;
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llist_item_put(l);
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list->size--;
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return prev;
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}
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prev = l;
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l = l->next;
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}
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return prev;
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}
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/* computes A\B */
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static void llist_sorted_difference_inplace(struct llist *A,
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struct llist *B)
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{
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struct llist_item *hint, *b;
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hint = NULL;
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b = B->front;
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while (b) {
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hint = llist_sorted_remove(A, b->oid, hint);
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b = b->next;
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}
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}
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static inline struct pack_list * pack_list_insert(struct pack_list **pl,
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struct pack_list *entry)
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{
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struct pack_list *p = xmalloc(sizeof(struct pack_list));
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memcpy(p, entry, sizeof(struct pack_list));
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p->next = *pl;
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*pl = p;
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return p;
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}
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static inline size_t pack_list_size(struct pack_list *pl)
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{
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size_t ret = 0;
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while (pl) {
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ret++;
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pl = pl->next;
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}
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return ret;
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}
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static struct pack_list * pack_list_difference(const struct pack_list *A,
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const struct pack_list *B)
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{
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struct pack_list *ret;
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const struct pack_list *pl;
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if (A == NULL)
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return NULL;
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pl = B;
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while (pl != NULL) {
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if (A->pack == pl->pack)
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return pack_list_difference(A->next, B);
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pl = pl->next;
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}
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ret = xmalloc(sizeof(struct pack_list));
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memcpy(ret, A, sizeof(struct pack_list));
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ret->next = pack_list_difference(A->next, B);
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return ret;
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}
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static void cmp_two_packs(struct pack_list *p1, struct pack_list *p2)
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{
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unsigned long p1_off = 0, p2_off = 0, p1_step, p2_step;
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const unsigned char *p1_base, *p2_base;
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struct llist_item *p1_hint = NULL, *p2_hint = NULL;
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const unsigned int hashsz = the_hash_algo->rawsz;
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if (!p1->unique_objects)
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p1->unique_objects = llist_copy(p1->remaining_objects);
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if (!p2->unique_objects)
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p2->unique_objects = llist_copy(p2->remaining_objects);
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p1_base = p1->pack->index_data;
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p2_base = p2->pack->index_data;
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p1_base += 256 * 4 + ((p1->pack->index_version < 2) ? 4 : 8);
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p2_base += 256 * 4 + ((p2->pack->index_version < 2) ? 4 : 8);
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p1_step = hashsz + ((p1->pack->index_version < 2) ? 4 : 0);
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p2_step = hashsz + ((p2->pack->index_version < 2) ? 4 : 0);
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while (p1_off < p1->pack->num_objects * p1_step &&
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p2_off < p2->pack->num_objects * p2_step)
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{
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const int cmp = hashcmp(p1_base + p1_off, p2_base + p2_off);
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/* cmp ~ p1 - p2 */
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if (cmp == 0) {
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p1_hint = llist_sorted_remove(p1->unique_objects,
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(const struct object_id *)(p1_base + p1_off),
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p1_hint);
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p2_hint = llist_sorted_remove(p2->unique_objects,
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(const struct object_id *)(p1_base + p1_off),
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p2_hint);
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p1_off += p1_step;
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p2_off += p2_step;
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continue;
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}
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if (cmp < 0) { /* p1 has the object, p2 doesn't */
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p1_off += p1_step;
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} else { /* p2 has the object, p1 doesn't */
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p2_off += p2_step;
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}
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}
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}
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static size_t sizeof_union(struct packed_git *p1, struct packed_git *p2)
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{
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size_t ret = 0;
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unsigned long p1_off = 0, p2_off = 0, p1_step, p2_step;
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const unsigned char *p1_base, *p2_base;
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const unsigned int hashsz = the_hash_algo->rawsz;
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p1_base = p1->index_data;
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p2_base = p2->index_data;
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p1_base += 256 * 4 + ((p1->index_version < 2) ? 4 : 8);
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p2_base += 256 * 4 + ((p2->index_version < 2) ? 4 : 8);
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p1_step = hashsz + ((p1->index_version < 2) ? 4 : 0);
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p2_step = hashsz + ((p2->index_version < 2) ? 4 : 0);
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while (p1_off < p1->num_objects * p1_step &&
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p2_off < p2->num_objects * p2_step)
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{
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int cmp = hashcmp(p1_base + p1_off, p2_base + p2_off);
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/* cmp ~ p1 - p2 */
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if (cmp == 0) {
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ret++;
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p1_off += p1_step;
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p2_off += p2_step;
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continue;
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}
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if (cmp < 0) { /* p1 has the object, p2 doesn't */
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p1_off += p1_step;
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} else { /* p2 has the object, p1 doesn't */
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p2_off += p2_step;
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}
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}
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return ret;
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}
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/* another O(n^2) function ... */
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static size_t get_pack_redundancy(struct pack_list *pl)
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{
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struct pack_list *subset;
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size_t ret = 0;
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if (pl == NULL)
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return 0;
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while ((subset = pl->next)) {
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while (subset) {
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ret += sizeof_union(pl->pack, subset->pack);
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subset = subset->next;
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}
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pl = pl->next;
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}
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return ret;
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}
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static inline off_t pack_set_bytecount(struct pack_list *pl)
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{
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off_t ret = 0;
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while (pl) {
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ret += pl->pack->pack_size;
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ret += pl->pack->index_size;
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pl = pl->next;
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}
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return ret;
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}
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static int cmp_remaining_objects(const void *a, const void *b)
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{
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struct pack_list *pl_a = *((struct pack_list **)a);
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struct pack_list *pl_b = *((struct pack_list **)b);
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if (pl_a->remaining_objects->size == pl_b->remaining_objects->size) {
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/* have the same remaining_objects, big pack first */
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if (pl_a->all_objects_size == pl_b->all_objects_size)
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return 0;
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else if (pl_a->all_objects_size < pl_b->all_objects_size)
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return 1;
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else
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return -1;
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} else if (pl_a->remaining_objects->size < pl_b->remaining_objects->size) {
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/* sort by remaining objects, more objects first */
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return 1;
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} else {
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return -1;
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}
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}
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/* Sort pack_list, greater size of remaining_objects first */
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static void sort_pack_list(struct pack_list **pl)
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{
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struct pack_list **ary, *p;
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int i;
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size_t n = pack_list_size(*pl);
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if (n < 2)
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return;
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/* prepare an array of packed_list for easier sorting */
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ary = xcalloc(n, sizeof(struct pack_list *));
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for (n = 0, p = *pl; p; p = p->next)
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ary[n++] = p;
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QSORT(ary, n, cmp_remaining_objects);
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/* link them back again */
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for (i = 0; i < n - 1; i++)
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ary[i]->next = ary[i + 1];
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ary[n - 1]->next = NULL;
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*pl = ary[0];
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free(ary);
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}
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static void minimize(struct pack_list **min)
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{
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struct pack_list *pl, *unique = NULL, *non_unique = NULL;
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struct llist *missing, *unique_pack_objects;
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pl = local_packs;
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while (pl) {
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if (pl->unique_objects->size)
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pack_list_insert(&unique, pl);
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else
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pack_list_insert(&non_unique, pl);
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pl = pl->next;
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}
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/* find out which objects are missing from the set of unique packs */
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missing = llist_copy(all_objects);
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pl = unique;
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while (pl) {
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llist_sorted_difference_inplace(missing, pl->remaining_objects);
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pl = pl->next;
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}
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*min = unique;
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/* return if there are no objects missing from the unique set */
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if (missing->size == 0) {
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free(missing);
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return;
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}
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unique_pack_objects = llist_copy(all_objects);
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llist_sorted_difference_inplace(unique_pack_objects, missing);
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/* remove unique pack objects from the non_unique packs */
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pl = non_unique;
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while (pl) {
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llist_sorted_difference_inplace(pl->remaining_objects, unique_pack_objects);
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pl = pl->next;
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}
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while (non_unique) {
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/* sort the non_unique packs, greater size of remaining_objects first */
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sort_pack_list(&non_unique);
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if (non_unique->remaining_objects->size == 0)
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break;
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pack_list_insert(min, non_unique);
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for (pl = non_unique->next; pl && pl->remaining_objects->size > 0; pl = pl->next)
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llist_sorted_difference_inplace(pl->remaining_objects, non_unique->remaining_objects);
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non_unique = non_unique->next;
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}
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}
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static void load_all_objects(void)
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{
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struct pack_list *pl = local_packs;
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struct llist_item *hint, *l;
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llist_init(&all_objects);
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while (pl) {
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hint = NULL;
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l = pl->remaining_objects->front;
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while (l) {
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hint = llist_insert_sorted_unique(all_objects,
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l->oid, hint);
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l = l->next;
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}
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pl = pl->next;
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}
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/* remove objects present in remote packs */
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pl = altodb_packs;
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while (pl) {
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llist_sorted_difference_inplace(all_objects, pl->remaining_objects);
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pl = pl->next;
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}
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}
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/* this scales like O(n^2) */
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static void cmp_local_packs(void)
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{
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struct pack_list *subset, *pl = local_packs;
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while ((subset = pl)) {
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while ((subset = subset->next))
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cmp_two_packs(pl, subset);
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pl = pl->next;
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}
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}
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static void scan_alt_odb_packs(void)
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{
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struct pack_list *local, *alt;
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alt = altodb_packs;
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while (alt) {
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local = local_packs;
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while (local) {
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llist_sorted_difference_inplace(local->remaining_objects,
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alt->remaining_objects);
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local = local->next;
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}
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alt = alt->next;
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}
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}
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static struct pack_list * add_pack(struct packed_git *p)
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{
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struct pack_list l;
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unsigned long off = 0, step;
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const unsigned char *base;
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if (!p->pack_local && !(alt_odb || verbose))
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return NULL;
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l.pack = p;
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llist_init(&l.remaining_objects);
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if (open_pack_index(p))
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return NULL;
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base = p->index_data;
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base += 256 * 4 + ((p->index_version < 2) ? 4 : 8);
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step = the_hash_algo->rawsz + ((p->index_version < 2) ? 4 : 0);
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while (off < p->num_objects * step) {
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llist_insert_back(l.remaining_objects, (const struct object_id *)(base + off));
|
|
off += step;
|
|
}
|
|
l.all_objects_size = l.remaining_objects->size;
|
|
l.unique_objects = NULL;
|
|
if (p->pack_local)
|
|
return pack_list_insert(&local_packs, &l);
|
|
else
|
|
return pack_list_insert(&altodb_packs, &l);
|
|
}
|
|
|
|
static struct pack_list * add_pack_file(const char *filename)
|
|
{
|
|
struct packed_git *p = get_all_packs(the_repository);
|
|
|
|
if (strlen(filename) < 40)
|
|
die("Bad pack filename: %s", filename);
|
|
|
|
while (p) {
|
|
if (strstr(p->pack_name, filename))
|
|
return add_pack(p);
|
|
p = p->next;
|
|
}
|
|
die("Filename %s not found in packed_git", filename);
|
|
}
|
|
|
|
static void load_all(void)
|
|
{
|
|
struct packed_git *p = get_all_packs(the_repository);
|
|
|
|
while (p) {
|
|
add_pack(p);
|
|
p = p->next;
|
|
}
|
|
}
|
|
|
|
int cmd_pack_redundant(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int i;
|
|
struct pack_list *min = NULL, *red, *pl;
|
|
struct llist *ignore;
|
|
struct object_id *oid;
|
|
char buf[GIT_MAX_HEXSZ + 2]; /* hex hash + \n + \0 */
|
|
|
|
if (argc == 2 && !strcmp(argv[1], "-h"))
|
|
usage(pack_redundant_usage);
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
if (!strcmp(arg, "--")) {
|
|
i++;
|
|
break;
|
|
}
|
|
if (!strcmp(arg, "--all")) {
|
|
load_all_packs = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--verbose")) {
|
|
verbose = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--alt-odb")) {
|
|
alt_odb = 1;
|
|
continue;
|
|
}
|
|
if (*arg == '-')
|
|
usage(pack_redundant_usage);
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (load_all_packs)
|
|
load_all();
|
|
else
|
|
while (*(argv + i) != NULL)
|
|
add_pack_file(*(argv + i++));
|
|
|
|
if (local_packs == NULL)
|
|
die("Zero packs found!");
|
|
|
|
load_all_objects();
|
|
|
|
if (alt_odb)
|
|
scan_alt_odb_packs();
|
|
|
|
/* ignore objects given on stdin */
|
|
llist_init(&ignore);
|
|
if (!isatty(0)) {
|
|
while (fgets(buf, sizeof(buf), stdin)) {
|
|
oid = xmalloc(sizeof(*oid));
|
|
if (get_oid_hex(buf, oid))
|
|
die("Bad object ID on stdin: %s", buf);
|
|
llist_insert_sorted_unique(ignore, oid, NULL);
|
|
}
|
|
}
|
|
llist_sorted_difference_inplace(all_objects, ignore);
|
|
pl = local_packs;
|
|
while (pl) {
|
|
llist_sorted_difference_inplace(pl->remaining_objects, ignore);
|
|
pl = pl->next;
|
|
}
|
|
|
|
cmp_local_packs();
|
|
|
|
minimize(&min);
|
|
|
|
if (verbose) {
|
|
fprintf(stderr, "There are %lu packs available in alt-odbs.\n",
|
|
(unsigned long)pack_list_size(altodb_packs));
|
|
fprintf(stderr, "The smallest (bytewise) set of packs is:\n");
|
|
pl = min;
|
|
while (pl) {
|
|
fprintf(stderr, "\t%s\n", pl->pack->pack_name);
|
|
pl = pl->next;
|
|
}
|
|
fprintf(stderr, "containing %lu duplicate objects "
|
|
"with a total size of %lukb.\n",
|
|
(unsigned long)get_pack_redundancy(min),
|
|
(unsigned long)pack_set_bytecount(min)/1024);
|
|
fprintf(stderr, "A total of %lu unique objects were considered.\n",
|
|
(unsigned long)all_objects->size);
|
|
fprintf(stderr, "Redundant packs (with indexes):\n");
|
|
}
|
|
pl = red = pack_list_difference(local_packs, min);
|
|
while (pl) {
|
|
printf("%s\n%s\n",
|
|
sha1_pack_index_name(pl->pack->hash),
|
|
pl->pack->pack_name);
|
|
pl = pl->next;
|
|
}
|
|
if (verbose)
|
|
fprintf(stderr, "%luMB of redundant packs in total.\n",
|
|
(unsigned long)pack_set_bytecount(red)/(1024*1024));
|
|
|
|
return 0;
|
|
}
|