diff options
Diffstat (limited to 'third_party/git/tag.c')
| -rw-r--r-- | third_party/git/tag.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/third_party/git/tag.c b/third_party/git/tag.c new file mode 100644 index 0000000000..5db870edb9 --- /dev/null +++ b/third_party/git/tag.c @@ -0,0 +1,214 @@ +#include "cache.h" +#include "tag.h" +#include "object-store.h" +#include "commit.h" +#include "tree.h" +#include "blob.h" +#include "alloc.h" +#include "gpg-interface.h" +#include "packfile.h" + +const char *tag_type = "tag"; + +static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags) +{ + struct signature_check sigc; + size_t payload_size; + int ret; + + memset(&sigc, 0, sizeof(sigc)); + + payload_size = parse_signature(buf, size); + + if (size == payload_size) { + if (flags & GPG_VERIFY_VERBOSE) + write_in_full(1, buf, payload_size); + return error("no signature found"); + } + + ret = check_signature(buf, payload_size, buf + payload_size, + size - payload_size, &sigc); + + if (!(flags & GPG_VERIFY_OMIT_STATUS)) + print_signature_buffer(&sigc, flags); + + signature_check_clear(&sigc); + return ret; +} + +int gpg_verify_tag(const struct object_id *oid, const char *name_to_report, + unsigned flags) +{ + enum object_type type; + char *buf; + unsigned long size; + int ret; + + type = oid_object_info(the_repository, oid, NULL); + if (type != OBJ_TAG) + return error("%s: cannot verify a non-tag object of type %s.", + name_to_report ? + name_to_report : + find_unique_abbrev(oid, DEFAULT_ABBREV), + type_name(type)); + + buf = read_object_file(oid, &type, &size); + if (!buf) + return error("%s: unable to read file.", + name_to_report ? + name_to_report : + find_unique_abbrev(oid, DEFAULT_ABBREV)); + + ret = run_gpg_verify(buf, size, flags); + + free(buf); + return ret; +} + +struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen) +{ + struct object_id *last_oid = NULL; + while (o && o->type == OBJ_TAG) + if (((struct tag *)o)->tagged) { + last_oid = &((struct tag *)o)->tagged->oid; + o = parse_object(r, last_oid); + } else { + last_oid = NULL; + o = NULL; + } + if (!o && warn) { + if (last_oid && is_promisor_object(last_oid)) + return NULL; + if (!warnlen) + warnlen = strlen(warn); + error("missing object referenced by '%.*s'", warnlen, warn); + } + return o; +} + +struct object *deref_tag_noverify(struct object *o) +{ + while (o && o->type == OBJ_TAG) { + o = parse_object(the_repository, &o->oid); + if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged) + o = ((struct tag *)o)->tagged; + else + o = NULL; + } + return o; +} + +struct tag *lookup_tag(struct repository *r, const struct object_id *oid) +{ + struct object *obj = lookup_object(r, oid); + if (!obj) + return create_object(r, oid, alloc_tag_node(r)); + return object_as_type(r, obj, OBJ_TAG, 0); +} + +static timestamp_t parse_tag_date(const char *buf, const char *tail) +{ + const char *dateptr; + + while (buf < tail && *buf++ != '>') + /* nada */; + if (buf >= tail) + return 0; + dateptr = buf; + while (buf < tail && *buf++ != '\n') + /* nada */; + if (buf >= tail) + return 0; + /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */ + return parse_timestamp(dateptr, NULL, 10); +} + +void release_tag_memory(struct tag *t) +{ + free(t->tag); + t->tagged = NULL; + t->object.parsed = 0; + t->date = 0; +} + +int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size) +{ + struct object_id oid; + char type[20]; + const char *bufptr = data; + const char *tail = bufptr + size; + const char *nl; + + if (item->object.parsed) + return 0; + item->object.parsed = 1; + + if (size < the_hash_algo->hexsz + 24) + return -1; + if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n') + return -1; + + if (!starts_with(bufptr, "type ")) + return -1; + bufptr += 5; + nl = memchr(bufptr, '\n', tail - bufptr); + if (!nl || sizeof(type) <= (nl - bufptr)) + return -1; + memcpy(type, bufptr, nl - bufptr); + type[nl - bufptr] = '\0'; + bufptr = nl + 1; + + if (!strcmp(type, blob_type)) { + item->tagged = (struct object *)lookup_blob(r, &oid); + } else if (!strcmp(type, tree_type)) { + item->tagged = (struct object *)lookup_tree(r, &oid); + } else if (!strcmp(type, commit_type)) { + item->tagged = (struct object *)lookup_commit(r, &oid); + } else if (!strcmp(type, tag_type)) { + item->tagged = (struct object *)lookup_tag(r, &oid); + } else { + error("Unknown type %s", type); + item->tagged = NULL; + } + + if (bufptr + 4 < tail && starts_with(bufptr, "tag ")) + ; /* good */ + else + return -1; + bufptr += 4; + nl = memchr(bufptr, '\n', tail - bufptr); + if (!nl) + return -1; + item->tag = xmemdupz(bufptr, nl - bufptr); + bufptr = nl + 1; + + if (bufptr + 7 < tail && starts_with(bufptr, "tagger ")) + item->date = parse_tag_date(bufptr, tail); + else + item->date = 0; + + return 0; +} + +int parse_tag(struct tag *item) +{ + enum object_type type; + void *data; + unsigned long size; + int ret; + + if (item->object.parsed) + return 0; + data = read_object_file(&item->object.oid, &type, &size); + if (!data) + return error("Could not read %s", + oid_to_hex(&item->object.oid)); + if (type != OBJ_TAG) { + free(data); + return error("Object %s not a tag", + oid_to_hex(&item->object.oid)); + } + ret = parse_tag_buffer(the_repository, item, data, size); + free(data); + return ret; +} |