diff options
Diffstat (limited to 'third_party/git/builtin/pack-redundant.c')
| -rw-r--r-- | third_party/git/builtin/pack-redundant.c | 653 |
1 files changed, 0 insertions, 653 deletions
diff --git a/third_party/git/builtin/pack-redundant.c b/third_party/git/builtin/pack-redundant.c deleted file mode 100644 index 178e3409b7..0000000000 --- a/third_party/git/builtin/pack-redundant.c +++ /dev/null @@ -1,653 +0,0 @@ -/* -* -* Copyright 2005, Lukas Sandstrom <lukass@etek.chalmers.se> -* -* This file is licensed under the GPL v2. -* -*/ - -#include "builtin.h" -#include "repository.h" -#include "packfile.h" -#include "object-store.h" - -#define BLKSIZE 512 - -static const char pack_redundant_usage[] = -"git pack-redundant [--verbose] [--alt-odb] (--all | <filename.pack>...)"; - -static int load_all_packs, verbose, alt_odb; - -struct llist_item { - struct llist_item *next; - const struct object_id *oid; -}; -static struct llist { - struct llist_item *front; - struct llist_item *back; - size_t size; -} *all_objects; /* all objects which must be present in local packfiles */ - -static struct pack_list { - struct pack_list *next; - struct packed_git *pack; - struct llist *unique_objects; - struct llist *remaining_objects; - size_t all_objects_size; -} *local_packs = NULL, *altodb_packs = NULL; - -static struct llist_item *free_nodes; - -static inline void llist_item_put(struct llist_item *item) -{ - item->next = free_nodes; - free_nodes = item; -} - -static inline struct llist_item *llist_item_get(void) -{ - struct llist_item *new_item; - if ( free_nodes ) { - new_item = free_nodes; - free_nodes = free_nodes->next; - } else { - int i = 1; - ALLOC_ARRAY(new_item, BLKSIZE); - for (; i < BLKSIZE; i++) - llist_item_put(&new_item[i]); - } - return new_item; -} - -static inline void llist_init(struct llist **list) -{ - *list = xmalloc(sizeof(struct llist)); - (*list)->front = (*list)->back = NULL; - (*list)->size = 0; -} - -static struct llist * llist_copy(struct llist *list) -{ - struct llist *ret; - struct llist_item *new_item, *old_item, *prev; - - llist_init(&ret); - - if ((ret->size = list->size) == 0) - return ret; - - new_item = ret->front = llist_item_get(); - new_item->oid = list->front->oid; - - old_item = list->front->next; - while (old_item) { - prev = new_item; - new_item = llist_item_get(); - prev->next = new_item; - new_item->oid = old_item->oid; - old_item = old_item->next; - } - new_item->next = NULL; - ret->back = new_item; - - return ret; -} - -static inline struct llist_item *llist_insert(struct llist *list, - struct llist_item *after, - const struct object_id *oid) -{ - struct llist_item *new_item = llist_item_get(); - new_item->oid = oid; - new_item->next = NULL; - - if (after != NULL) { - new_item->next = after->next; - after->next = new_item; - if (after == list->back) - list->back = new_item; - } else {/* insert in front */ - if (list->size == 0) - list->back = new_item; - else - new_item->next = list->front; - list->front = new_item; - } - list->size++; - return new_item; -} - -static inline struct llist_item *llist_insert_back(struct llist *list, - const struct object_id *oid) -{ - return llist_insert(list, list->back, oid); -} - -static inline struct llist_item *llist_insert_sorted_unique(struct llist *list, - const struct object_id *oid, struct llist_item *hint) -{ - struct llist_item *prev = NULL, *l; - - l = (hint == NULL) ? list->front : hint; - while (l) { - int cmp = oidcmp(l->oid, oid); - if (cmp > 0) { /* we insert before this entry */ - return llist_insert(list, prev, oid); - } - if (!cmp) { /* already exists */ - return l; - } - prev = l; - l = l->next; - } - /* insert at the end */ - return llist_insert_back(list, oid); -} - -/* returns a pointer to an item in front of sha1 */ -static inline struct llist_item * llist_sorted_remove(struct llist *list, const struct object_id *oid, struct llist_item *hint) -{ - struct llist_item *prev, *l; - -redo_from_start: - l = (hint == NULL) ? list->front : hint; - prev = NULL; - while (l) { - const int cmp = oidcmp(l->oid, oid); - if (cmp > 0) /* not in list, since sorted */ - return prev; - if (!cmp) { /* found */ - if (prev == NULL) { - if (hint != NULL && hint != list->front) { - /* we don't know the previous element */ - hint = NULL; - goto redo_from_start; - } - list->front = l->next; - } else - prev->next = l->next; - if (l == list->back) - list->back = prev; - llist_item_put(l); - list->size--; - return prev; - } - prev = l; - l = l->next; - } - return prev; -} - -/* computes A\B */ -static void llist_sorted_difference_inplace(struct llist *A, - struct llist *B) -{ - struct llist_item *hint, *b; - - hint = NULL; - b = B->front; - - while (b) { - hint = llist_sorted_remove(A, b->oid, hint); - b = b->next; - } -} - -static inline struct pack_list * pack_list_insert(struct pack_list **pl, - struct pack_list *entry) -{ - struct pack_list *p = xmalloc(sizeof(struct pack_list)); - memcpy(p, entry, sizeof(struct pack_list)); - p->next = *pl; - *pl = p; - return p; -} - -static inline size_t pack_list_size(struct pack_list *pl) -{ - size_t ret = 0; - while (pl) { - ret++; - pl = pl->next; - } - return ret; -} - -static struct pack_list * pack_list_difference(const struct pack_list *A, - const struct pack_list *B) -{ - struct pack_list *ret; - const struct pack_list *pl; - - if (A == NULL) - return NULL; - - pl = B; - while (pl != NULL) { - if (A->pack == pl->pack) - return pack_list_difference(A->next, B); - pl = pl->next; - } - ret = xmalloc(sizeof(struct pack_list)); - memcpy(ret, A, sizeof(struct pack_list)); - ret->next = pack_list_difference(A->next, B); - return ret; -} - -static void cmp_two_packs(struct pack_list *p1, struct pack_list *p2) -{ - unsigned long p1_off = 0, p2_off = 0, p1_step, p2_step; - const unsigned char *p1_base, *p2_base; - struct llist_item *p1_hint = NULL, *p2_hint = NULL; - const unsigned int hashsz = the_hash_algo->rawsz; - - if (!p1->unique_objects) - p1->unique_objects = llist_copy(p1->remaining_objects); - if (!p2->unique_objects) - p2->unique_objects = llist_copy(p2->remaining_objects); - - p1_base = p1->pack->index_data; - p2_base = p2->pack->index_data; - p1_base += 256 * 4 + ((p1->pack->index_version < 2) ? 4 : 8); - p2_base += 256 * 4 + ((p2->pack->index_version < 2) ? 4 : 8); - p1_step = hashsz + ((p1->pack->index_version < 2) ? 4 : 0); - p2_step = hashsz + ((p2->pack->index_version < 2) ? 4 : 0); - - while (p1_off < p1->pack->num_objects * p1_step && - p2_off < p2->pack->num_objects * p2_step) - { - const int cmp = hashcmp(p1_base + p1_off, p2_base + p2_off); - /* cmp ~ p1 - p2 */ - if (cmp == 0) { - p1_hint = llist_sorted_remove(p1->unique_objects, - (const struct object_id *)(p1_base + p1_off), - p1_hint); - p2_hint = llist_sorted_remove(p2->unique_objects, - (const struct object_id *)(p1_base + p1_off), - p2_hint); - p1_off += p1_step; - p2_off += p2_step; - continue; - } - if (cmp < 0) { /* p1 has the object, p2 doesn't */ - p1_off += p1_step; - } else { /* p2 has the object, p1 doesn't */ - p2_off += p2_step; - } - } -} - -static size_t sizeof_union(struct packed_git *p1, struct packed_git *p2) -{ - size_t ret = 0; - unsigned long p1_off = 0, p2_off = 0, p1_step, p2_step; - const unsigned char *p1_base, *p2_base; - const unsigned int hashsz = the_hash_algo->rawsz; - - p1_base = p1->index_data; - p2_base = p2->index_data; - p1_base += 256 * 4 + ((p1->index_version < 2) ? 4 : 8); - p2_base += 256 * 4 + ((p2->index_version < 2) ? 4 : 8); - p1_step = hashsz + ((p1->index_version < 2) ? 4 : 0); - p2_step = hashsz + ((p2->index_version < 2) ? 4 : 0); - - while (p1_off < p1->num_objects * p1_step && - p2_off < p2->num_objects * p2_step) - { - int cmp = hashcmp(p1_base + p1_off, p2_base + p2_off); - /* cmp ~ p1 - p2 */ - if (cmp == 0) { - ret++; - p1_off += p1_step; - p2_off += p2_step; - continue; - } - if (cmp < 0) { /* p1 has the object, p2 doesn't */ - p1_off += p1_step; - } else { /* p2 has the object, p1 doesn't */ - p2_off += p2_step; - } - } - return ret; -} - -/* another O(n^2) function ... */ -static size_t get_pack_redundancy(struct pack_list *pl) -{ - struct pack_list *subset; - size_t ret = 0; - - if (pl == NULL) - return 0; - - while ((subset = pl->next)) { - while (subset) { - ret += sizeof_union(pl->pack, subset->pack); - subset = subset->next; - } - pl = pl->next; - } - return ret; -} - -static inline off_t pack_set_bytecount(struct pack_list *pl) -{ - off_t ret = 0; - while (pl) { - ret += pl->pack->pack_size; - ret += pl->pack->index_size; - pl = pl->next; - } - return ret; -} - -static int cmp_remaining_objects(const void *a, const void *b) -{ - struct pack_list *pl_a = *((struct pack_list **)a); - struct pack_list *pl_b = *((struct pack_list **)b); - - if (pl_a->remaining_objects->size == pl_b->remaining_objects->size) { - /* have the same remaining_objects, big pack first */ - if (pl_a->all_objects_size == pl_b->all_objects_size) - return 0; - else if (pl_a->all_objects_size < pl_b->all_objects_size) - return 1; - else - return -1; - } else if (pl_a->remaining_objects->size < pl_b->remaining_objects->size) { - /* sort by remaining objects, more objects first */ - return 1; - } else { - return -1; - } -} - -/* Sort pack_list, greater size of remaining_objects first */ -static void sort_pack_list(struct pack_list **pl) -{ - struct pack_list **ary, *p; - int i; - size_t n = pack_list_size(*pl); - - if (n < 2) - return; - - /* prepare an array of packed_list for easier sorting */ - ary = xcalloc(n, sizeof(struct pack_list *)); - for (n = 0, p = *pl; p; p = p->next) - ary[n++] = p; - - QSORT(ary, n, cmp_remaining_objects); - - /* link them back again */ - for (i = 0; i < n - 1; i++) - ary[i]->next = ary[i + 1]; - ary[n - 1]->next = NULL; - *pl = ary[0]; - - free(ary); -} - - -static void minimize(struct pack_list **min) -{ - struct pack_list *pl, *unique = NULL, *non_unique = NULL; - struct llist *missing, *unique_pack_objects; - - pl = local_packs; - while (pl) { - if (pl->unique_objects->size) - pack_list_insert(&unique, pl); - else - pack_list_insert(&non_unique, pl); - pl = pl->next; - } - /* find out which objects are missing from the set of unique packs */ - missing = llist_copy(all_objects); - pl = unique; - while (pl) { - llist_sorted_difference_inplace(missing, pl->remaining_objects); - pl = pl->next; - } - - *min = unique; - - /* return if there are no objects missing from the unique set */ - if (missing->size == 0) { - free(missing); - return; - } - - unique_pack_objects = llist_copy(all_objects); - llist_sorted_difference_inplace(unique_pack_objects, missing); - - /* remove unique pack objects from the non_unique packs */ - pl = non_unique; - while (pl) { - llist_sorted_difference_inplace(pl->remaining_objects, unique_pack_objects); - pl = pl->next; - } - - while (non_unique) { - /* sort the non_unique packs, greater size of remaining_objects first */ - sort_pack_list(&non_unique); - if (non_unique->remaining_objects->size == 0) - break; - - pack_list_insert(min, non_unique); - - for (pl = non_unique->next; pl && pl->remaining_objects->size > 0; pl = pl->next) - llist_sorted_difference_inplace(pl->remaining_objects, non_unique->remaining_objects); - - non_unique = non_unique->next; - } -} - -static void load_all_objects(void) -{ - struct pack_list *pl = local_packs; - struct llist_item *hint, *l; - - llist_init(&all_objects); - - while (pl) { - hint = NULL; - l = pl->remaining_objects->front; - while (l) { - hint = llist_insert_sorted_unique(all_objects, - l->oid, hint); - l = l->next; - } - pl = pl->next; - } - /* remove objects present in remote packs */ - pl = altodb_packs; - while (pl) { - llist_sorted_difference_inplace(all_objects, pl->remaining_objects); - pl = pl->next; - } -} - -/* this scales like O(n^2) */ -static void cmp_local_packs(void) -{ - struct pack_list *subset, *pl = local_packs; - - while ((subset = pl)) { - while ((subset = subset->next)) - cmp_two_packs(pl, subset); - pl = pl->next; - } -} - -static void scan_alt_odb_packs(void) -{ - struct pack_list *local, *alt; - - alt = altodb_packs; - while (alt) { - local = local_packs; - while (local) { - llist_sorted_difference_inplace(local->remaining_objects, - alt->remaining_objects); - local = local->next; - } - alt = alt->next; - } -} - -static struct pack_list * add_pack(struct packed_git *p) -{ - struct pack_list l; - unsigned long off = 0, step; - const unsigned char *base; - - if (!p->pack_local && !(alt_odb || verbose)) - return NULL; - - l.pack = p; - llist_init(&l.remaining_objects); - - if (open_pack_index(p)) - return NULL; - - base = p->index_data; - base += 256 * 4 + ((p->index_version < 2) ? 4 : 8); - step = the_hash_algo->rawsz + ((p->index_version < 2) ? 4 : 0); - while (off < p->num_objects * step) { - 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; -} |