| /* |
| * This file is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, |
| * as published by the Free Software Foundation. |
| * |
| * In addition to the permissions in the GNU General Public License, |
| * the authors give you unlimited permission to link the compiled |
| * version of this file into combinations with other programs, |
| * and to distribute those combinations without any restriction |
| * coming from the use of this file. (The General Public License |
| * restrictions do apply in other respects; for example, they cover |
| * modification of the file, and distribution when not linked into |
| * a combined executable.) |
| * |
| * This file is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; see the file COPYING. If not, write to |
| * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "common.h" |
| #include "git2/zlib.h" |
| #include "git2/object.h" |
| #include "fileops.h" |
| #include "hash.h" |
| #include "odb.h" |
| #include "delta-apply.h" |
| |
| #include "git2/odb_backend.h" |
| |
| #define GIT_ALTERNATES_FILE "info/alternates" |
| |
| /* TODO: is this correct? */ |
| #define GIT_LOOSE_PRIORITY 2 |
| #define GIT_PACKED_PRIORITY 1 |
| |
| typedef struct |
| { |
| git_odb_backend *backend; |
| int priority; |
| int is_alternate; |
| } backend_internal; |
| |
| static int format_object_header(char *hdr, size_t n, git_rawobj *obj) |
| { |
| const char *type_str = git_object_type2string(obj->type); |
| int len = snprintf(hdr, n, "%s %"PRIuZ, type_str, obj->len); |
| |
| assert(len > 0); /* otherwise snprintf() is broken */ |
| assert(((size_t) len) < n); /* otherwise the caller is broken! */ |
| |
| if (len < 0 || ((size_t) len) >= n) |
| return GIT_ERROR; |
| return len+1; |
| } |
| |
| int git_odb__hash_obj(git_oid *id, char *hdr, size_t n, int *len, git_rawobj *obj) |
| { |
| git_buf_vec vec[2]; |
| int hdrlen; |
| |
| assert(id && hdr && len && obj); |
| |
| if (!git_object_typeisloose(obj->type)) |
| return GIT_ERROR; |
| |
| if (!obj->data && obj->len != 0) |
| return GIT_ERROR; |
| |
| if ((hdrlen = format_object_header(hdr, n, obj)) < 0) |
| return GIT_ERROR; |
| |
| *len = hdrlen; |
| |
| vec[0].data = hdr; |
| vec[0].len = hdrlen; |
| vec[1].data = obj->data; |
| vec[1].len = obj->len; |
| |
| git_hash_vec(id, vec, 2); |
| |
| return GIT_SUCCESS; |
| } |
| |
| void git_rawobj_close(git_rawobj *obj) |
| { |
| free(obj->data); |
| obj->data = NULL; |
| } |
| |
| int git_rawobj_hash(git_oid *id, git_rawobj *obj) |
| { |
| char hdr[64]; |
| int hdrlen; |
| |
| assert(id && obj); |
| |
| return git_odb__hash_obj(id, hdr, sizeof(hdr), &hdrlen, obj); |
| } |
| |
| int git_odb__inflate_buffer(void *in, size_t inlen, void *out, size_t outlen) |
| { |
| z_stream zs; |
| int status = Z_OK; |
| |
| memset(&zs, 0x0, sizeof(zs)); |
| |
| zs.next_out = out; |
| zs.avail_out = outlen; |
| |
| zs.next_in = in; |
| zs.avail_in = inlen; |
| |
| if (inflateInit(&zs) < Z_OK) |
| return GIT_ERROR; |
| |
| while (status == Z_OK) |
| status = inflate(&zs, Z_FINISH); |
| |
| inflateEnd(&zs); |
| |
| if ((status != Z_STREAM_END) /*|| (zs.avail_in != 0) */) |
| return GIT_ERROR; |
| |
| if (zs.total_out != outlen) |
| return GIT_ERROR; |
| |
| return GIT_SUCCESS; |
| } |
| |
| |
| |
| |
| |
| /*********************************************************** |
| * |
| * OBJECT DATABASE PUBLIC API |
| * |
| * Public calls for the ODB functionality |
| * |
| ***********************************************************/ |
| |
| int backend_sort_cmp(const void *a, const void *b) |
| { |
| const backend_internal *backend_a = *(const backend_internal **)(a); |
| const backend_internal *backend_b = *(const backend_internal **)(b); |
| |
| if (backend_a->is_alternate == backend_b->is_alternate) |
| return (backend_b->priority - backend_a->priority); |
| |
| return backend_a->is_alternate ? 1 : -1; |
| } |
| |
| int git_odb_new(git_odb **out) |
| { |
| git_odb *db = git__calloc(1, sizeof(*db)); |
| if (!db) |
| return GIT_ENOMEM; |
| |
| if (git_vector_init(&db->backends, 4, backend_sort_cmp) < 0) { |
| free(db); |
| return GIT_ENOMEM; |
| } |
| |
| *out = db; |
| return GIT_SUCCESS; |
| } |
| |
| static int add_backend_internal(git_odb *odb, git_odb_backend *backend, int priority, int is_alternate) |
| { |
| backend_internal *internal; |
| |
| assert(odb && backend); |
| |
| if (backend->odb != NULL && backend->odb != odb) |
| return GIT_EBUSY; |
| |
| internal = git__malloc(sizeof(backend_internal)); |
| if (internal == NULL) |
| return GIT_ENOMEM; |
| |
| internal->backend = backend; |
| internal->priority = priority; |
| internal->is_alternate = is_alternate; |
| |
| if (git_vector_insert(&odb->backends, internal) < 0) { |
| free(internal); |
| return GIT_ENOMEM; |
| } |
| |
| git_vector_sort(&odb->backends); |
| internal->backend->odb = odb; |
| return GIT_SUCCESS; |
| } |
| |
| int git_odb_add_backend(git_odb *odb, git_odb_backend *backend, int priority) |
| { |
| return add_backend_internal(odb, backend, priority, 0); |
| } |
| |
| int git_odb_add_alternate(git_odb *odb, git_odb_backend *backend, int priority) |
| { |
| return add_backend_internal(odb, backend, priority, 1); |
| } |
| |
| static int add_default_backends(git_odb *db, const char *objects_dir, int as_alternates) |
| { |
| git_odb_backend *loose, *packed; |
| int error; |
| |
| /* add the loose object backend */ |
| error = git_odb_backend_loose(&loose, objects_dir); |
| if (error < GIT_SUCCESS) |
| return error; |
| |
| error = add_backend_internal(db, loose, GIT_LOOSE_PRIORITY, as_alternates); |
| if (error < GIT_SUCCESS) |
| return error; |
| |
| /* add the packed file backend */ |
| error = git_odb_backend_pack(&packed, objects_dir); |
| if (error < GIT_SUCCESS) |
| return error; |
| |
| error = add_backend_internal(db, packed, GIT_PACKED_PRIORITY, as_alternates); |
| if (error < GIT_SUCCESS) |
| return error; |
| |
| return GIT_SUCCESS; |
| } |
| |
| static int load_alternates(git_odb *odb, const char *objects_dir) |
| { |
| char alternates_path[GIT_PATH_MAX]; |
| char alternate[GIT_PATH_MAX]; |
| char *buffer; |
| |
| gitfo_buf alternates_buf = GITFO_BUF_INIT; |
| int error; |
| |
| git__joinpath(alternates_path, objects_dir, GIT_ALTERNATES_FILE); |
| |
| if (gitfo_exists(alternates_path) < GIT_SUCCESS) |
| return GIT_SUCCESS; |
| |
| if (gitfo_read_file(&alternates_buf, alternates_path) < GIT_SUCCESS) |
| return GIT_EOSERR; |
| |
| buffer = (char *)alternates_buf.data; |
| error = GIT_SUCCESS; |
| |
| /* add each alternate as a new backend; one alternate per line */ |
| while ((error == GIT_SUCCESS) && (buffer = git__strtok(alternate, buffer, "\r\n")) != NULL) |
| error = add_default_backends(odb, alternate, 1); |
| |
| gitfo_free_buf(&alternates_buf); |
| return error; |
| } |
| |
| int git_odb_open(git_odb **out, const char *objects_dir) |
| { |
| git_odb *db; |
| int error; |
| |
| assert(out && objects_dir); |
| |
| *out = NULL; |
| |
| if ((error = git_odb_new(&db)) < 0) |
| return error; |
| |
| if ((error = add_default_backends(db, objects_dir, 0)) < GIT_SUCCESS) |
| goto cleanup; |
| |
| if ((error = load_alternates(db, objects_dir)) < GIT_SUCCESS) |
| goto cleanup; |
| |
| *out = db; |
| return GIT_SUCCESS; |
| |
| cleanup: |
| git_odb_close(db); |
| return error; |
| } |
| |
| void git_odb_close(git_odb *db) |
| { |
| unsigned int i; |
| |
| if (db == NULL) |
| return; |
| |
| for (i = 0; i < db->backends.length; ++i) { |
| backend_internal *internal = git_vector_get(&db->backends, i); |
| git_odb_backend *backend = internal->backend; |
| |
| if (backend->free) backend->free(backend); |
| else free(backend); |
| |
| free(internal); |
| } |
| |
| git_vector_free(&db->backends); |
| free(db); |
| } |
| |
| int git_odb_exists(git_odb *db, const git_oid *id) |
| { |
| unsigned int i; |
| int found = 0; |
| |
| assert(db && id); |
| |
| for (i = 0; i < db->backends.length && !found; ++i) { |
| backend_internal *internal = git_vector_get(&db->backends, i); |
| git_odb_backend *b = internal->backend; |
| |
| if (b->exists != NULL) |
| found = b->exists(b, id); |
| } |
| |
| return found; |
| } |
| |
| int git_odb_read_header(git_rawobj *out, git_odb *db, const git_oid *id) |
| { |
| unsigned int i; |
| int error = GIT_ENOTFOUND; |
| |
| assert(out && db && id); |
| |
| for (i = 0; i < db->backends.length && error < 0; ++i) { |
| backend_internal *internal = git_vector_get(&db->backends, i); |
| git_odb_backend *b = internal->backend; |
| |
| if (b->read_header != NULL) |
| error = b->read_header(out, b, id); |
| } |
| |
| /* |
| * no backend could read only the header. |
| * try reading the whole object and freeing the contents |
| */ |
| if (error < 0) { |
| error = git_odb_read(out, db, id); |
| git_rawobj_close(out); |
| } |
| |
| return error; |
| } |
| |
| int git_odb_read(git_rawobj *out, git_odb *db, const git_oid *id) |
| { |
| unsigned int i; |
| int error = GIT_ENOTFOUND; |
| |
| assert(out && db && id); |
| |
| for (i = 0; i < db->backends.length && error < 0; ++i) { |
| backend_internal *internal = git_vector_get(&db->backends, i); |
| git_odb_backend *b = internal->backend; |
| |
| if (b->read != NULL) |
| error = b->read(out, b, id); |
| } |
| |
| return error; |
| } |
| |
| int git_odb_write(git_oid *id, git_odb *db, git_rawobj *obj) |
| { |
| unsigned int i; |
| int error = GIT_ERROR; |
| |
| assert(obj && db && id); |
| |
| for (i = 0; i < db->backends.length && error < 0; ++i) { |
| backend_internal *internal = git_vector_get(&db->backends, i); |
| git_odb_backend *b = internal->backend; |
| |
| /* we don't write in alternates! */ |
| if (internal->is_alternate) |
| continue; |
| |
| if (b->write != NULL) |
| error = b->write(id, b, obj); |
| } |
| |
| return error; |
| } |
| |