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https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Jonathan Tan](/assets/img/avatar_default.png)
finish_http_pack_request() does multiple tasks, including some housekeeping on a struct packed_git - (1) closing its index, (2) removing it from a list, and (3) installing it. These concerns are independent of fetching a pack through HTTP: they are there only because (1) the calling code opens the pack's index before deciding to fetch it, (2) the calling code maintains a list of packfiles that can be fetched, and (3) the calling code fetches it in order to make use of its objects in the same process. In preparation for a subsequent commit, which adds a feature that does not need any of this housekeeping, remove (1), (2), and (3) from finish_http_pack_request(). (2) and (3) are now done by a helper function, and (1) is the responsibility of the caller (in this patch, done closer to the point where the pack index is opened). Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
632 lines
15 KiB
C
632 lines
15 KiB
C
#include "cache.h"
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#include "repository.h"
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#include "commit.h"
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#include "walker.h"
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#include "http.h"
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#include "list.h"
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#include "transport.h"
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#include "packfile.h"
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#include "object-store.h"
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struct alt_base {
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char *base;
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int got_indices;
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struct packed_git *packs;
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struct alt_base *next;
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};
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enum object_request_state {
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WAITING,
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ABORTED,
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ACTIVE,
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COMPLETE
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};
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struct object_request {
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struct walker *walker;
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struct object_id oid;
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struct alt_base *repo;
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enum object_request_state state;
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struct http_object_request *req;
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struct list_head node;
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};
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struct alternates_request {
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struct walker *walker;
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const char *base;
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struct strbuf *url;
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struct strbuf *buffer;
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struct active_request_slot *slot;
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int http_specific;
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};
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struct walker_data {
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const char *url;
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int got_alternates;
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struct alt_base *alt;
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};
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static LIST_HEAD(object_queue_head);
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static void fetch_alternates(struct walker *walker, const char *base);
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static void process_object_response(void *callback_data);
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static void start_object_request(struct walker *walker,
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struct object_request *obj_req)
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{
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struct active_request_slot *slot;
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struct http_object_request *req;
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req = new_http_object_request(obj_req->repo->base, &obj_req->oid);
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if (req == NULL) {
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obj_req->state = ABORTED;
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return;
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}
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obj_req->req = req;
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slot = req->slot;
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slot->callback_func = process_object_response;
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slot->callback_data = obj_req;
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/* Try to get the request started, abort the request on error */
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obj_req->state = ACTIVE;
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if (!start_active_slot(slot)) {
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obj_req->state = ABORTED;
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release_http_object_request(req);
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return;
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}
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}
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static void finish_object_request(struct object_request *obj_req)
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{
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if (finish_http_object_request(obj_req->req))
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return;
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if (obj_req->req->rename == 0)
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walker_say(obj_req->walker, "got %s\n", oid_to_hex(&obj_req->oid));
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}
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static void process_object_response(void *callback_data)
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{
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struct object_request *obj_req =
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(struct object_request *)callback_data;
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struct walker *walker = obj_req->walker;
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struct walker_data *data = walker->data;
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struct alt_base *alt = data->alt;
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process_http_object_request(obj_req->req);
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obj_req->state = COMPLETE;
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normalize_curl_result(&obj_req->req->curl_result,
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obj_req->req->http_code,
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obj_req->req->errorstr,
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sizeof(obj_req->req->errorstr));
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/* Use alternates if necessary */
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if (missing_target(obj_req->req)) {
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fetch_alternates(walker, alt->base);
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if (obj_req->repo->next != NULL) {
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obj_req->repo =
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obj_req->repo->next;
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release_http_object_request(obj_req->req);
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start_object_request(walker, obj_req);
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return;
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}
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}
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finish_object_request(obj_req);
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}
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static void release_object_request(struct object_request *obj_req)
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{
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if (obj_req->req !=NULL && obj_req->req->localfile != -1)
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error("fd leakage in release: %d", obj_req->req->localfile);
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list_del(&obj_req->node);
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free(obj_req);
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}
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#ifdef USE_CURL_MULTI
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static int fill_active_slot(struct walker *walker)
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{
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struct object_request *obj_req;
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struct list_head *pos, *tmp, *head = &object_queue_head;
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list_for_each_safe(pos, tmp, head) {
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obj_req = list_entry(pos, struct object_request, node);
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if (obj_req->state == WAITING) {
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if (has_object_file(&obj_req->oid))
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obj_req->state = COMPLETE;
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else {
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start_object_request(walker, obj_req);
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return 1;
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}
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}
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}
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return 0;
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}
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#endif
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static void prefetch(struct walker *walker, unsigned char *sha1)
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{
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struct object_request *newreq;
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struct walker_data *data = walker->data;
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newreq = xmalloc(sizeof(*newreq));
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newreq->walker = walker;
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hashcpy(newreq->oid.hash, sha1);
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newreq->repo = data->alt;
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newreq->state = WAITING;
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newreq->req = NULL;
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http_is_verbose = walker->get_verbosely;
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list_add_tail(&newreq->node, &object_queue_head);
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#ifdef USE_CURL_MULTI
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fill_active_slots();
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step_active_slots();
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#endif
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}
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static int is_alternate_allowed(const char *url)
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{
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const char *protocols[] = {
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"http", "https", "ftp", "ftps"
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};
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int i;
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if (http_follow_config != HTTP_FOLLOW_ALWAYS) {
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warning("alternate disabled by http.followRedirects: %s", url);
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return 0;
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}
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for (i = 0; i < ARRAY_SIZE(protocols); i++) {
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const char *end;
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if (skip_prefix(url, protocols[i], &end) &&
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starts_with(end, "://"))
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break;
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}
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if (i >= ARRAY_SIZE(protocols)) {
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warning("ignoring alternate with unknown protocol: %s", url);
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return 0;
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}
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if (!is_transport_allowed(protocols[i], 0)) {
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warning("ignoring alternate with restricted protocol: %s", url);
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return 0;
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}
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return 1;
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}
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static void process_alternates_response(void *callback_data)
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{
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struct alternates_request *alt_req =
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(struct alternates_request *)callback_data;
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struct walker *walker = alt_req->walker;
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struct walker_data *cdata = walker->data;
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struct active_request_slot *slot = alt_req->slot;
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struct alt_base *tail = cdata->alt;
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const char *base = alt_req->base;
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const char null_byte = '\0';
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char *data;
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int i = 0;
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normalize_curl_result(&slot->curl_result, slot->http_code,
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curl_errorstr, sizeof(curl_errorstr));
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if (alt_req->http_specific) {
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if (slot->curl_result != CURLE_OK ||
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!alt_req->buffer->len) {
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/* Try reusing the slot to get non-http alternates */
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alt_req->http_specific = 0;
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strbuf_reset(alt_req->url);
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strbuf_addf(alt_req->url, "%s/objects/info/alternates",
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base);
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curl_easy_setopt(slot->curl, CURLOPT_URL,
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alt_req->url->buf);
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active_requests++;
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slot->in_use = 1;
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if (slot->finished != NULL)
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(*slot->finished) = 0;
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if (!start_active_slot(slot)) {
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cdata->got_alternates = -1;
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slot->in_use = 0;
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if (slot->finished != NULL)
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(*slot->finished) = 1;
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}
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return;
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}
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} else if (slot->curl_result != CURLE_OK) {
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if (!missing_target(slot)) {
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cdata->got_alternates = -1;
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return;
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}
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}
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fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
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alt_req->buffer->len--;
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data = alt_req->buffer->buf;
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while (i < alt_req->buffer->len) {
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int posn = i;
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while (posn < alt_req->buffer->len && data[posn] != '\n')
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posn++;
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if (data[posn] == '\n') {
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int okay = 0;
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int serverlen = 0;
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struct alt_base *newalt;
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if (data[i] == '/') {
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/*
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* This counts
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* http://git.host/pub/scm/linux.git/
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* -----------here^
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* so memcpy(dst, base, serverlen) will
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* copy up to "...git.host".
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*/
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const char *colon_ss = strstr(base,"://");
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if (colon_ss) {
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serverlen = (strchr(colon_ss + 3, '/')
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- base);
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okay = 1;
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}
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} else if (!memcmp(data + i, "../", 3)) {
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/*
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* Relative URL; chop the corresponding
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* number of subpath from base (and ../
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* from data), and concatenate the result.
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*
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* The code first drops ../ from data, and
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* then drops one ../ from data and one path
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* from base. IOW, one extra ../ is dropped
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* from data than path is dropped from base.
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*
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* This is not wrong. The alternate in
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* http://git.host/pub/scm/linux.git/
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* to borrow from
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* http://git.host/pub/scm/linus.git/
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* is ../../linus.git/objects/. You need
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* two ../../ to borrow from your direct
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* neighbour.
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*/
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i += 3;
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serverlen = strlen(base);
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while (i + 2 < posn &&
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!memcmp(data + i, "../", 3)) {
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do {
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serverlen--;
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} while (serverlen &&
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base[serverlen - 1] != '/');
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i += 3;
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}
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/* If the server got removed, give up. */
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okay = strchr(base, ':') - base + 3 <
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serverlen;
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} else if (alt_req->http_specific) {
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char *colon = strchr(data + i, ':');
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char *slash = strchr(data + i, '/');
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if (colon && slash && colon < data + posn &&
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slash < data + posn && colon < slash) {
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okay = 1;
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}
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}
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if (okay) {
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struct strbuf target = STRBUF_INIT;
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strbuf_add(&target, base, serverlen);
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strbuf_add(&target, data + i, posn - i);
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if (!strbuf_strip_suffix(&target, "objects")) {
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warning("ignoring alternate that does"
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" not end in 'objects': %s",
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target.buf);
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strbuf_release(&target);
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} else if (is_alternate_allowed(target.buf)) {
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warning("adding alternate object store: %s",
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target.buf);
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newalt = xmalloc(sizeof(*newalt));
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newalt->next = NULL;
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newalt->base = strbuf_detach(&target, NULL);
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newalt->got_indices = 0;
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newalt->packs = NULL;
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while (tail->next != NULL)
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tail = tail->next;
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tail->next = newalt;
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} else {
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strbuf_release(&target);
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}
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}
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}
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i = posn + 1;
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}
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cdata->got_alternates = 1;
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}
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static void fetch_alternates(struct walker *walker, const char *base)
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{
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struct strbuf buffer = STRBUF_INIT;
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struct strbuf url = STRBUF_INIT;
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struct active_request_slot *slot;
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struct alternates_request alt_req;
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struct walker_data *cdata = walker->data;
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/*
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* If another request has already started fetching alternates,
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* wait for them to arrive and return to processing this request's
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* curl message
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*/
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#ifdef USE_CURL_MULTI
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while (cdata->got_alternates == 0) {
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step_active_slots();
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}
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#endif
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/* Nothing to do if they've already been fetched */
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if (cdata->got_alternates == 1)
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return;
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/* Start the fetch */
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cdata->got_alternates = 0;
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if (walker->get_verbosely)
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fprintf(stderr, "Getting alternates list for %s\n", base);
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strbuf_addf(&url, "%s/objects/info/http-alternates", base);
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/*
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* Use a callback to process the result, since another request
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* may fail and need to have alternates loaded before continuing
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*/
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slot = get_active_slot();
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slot->callback_func = process_alternates_response;
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alt_req.walker = walker;
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slot->callback_data = &alt_req;
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curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
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curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
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curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf);
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alt_req.base = base;
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alt_req.url = &url;
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alt_req.buffer = &buffer;
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alt_req.http_specific = 1;
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alt_req.slot = slot;
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if (start_active_slot(slot))
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run_active_slot(slot);
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else
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cdata->got_alternates = -1;
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strbuf_release(&buffer);
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strbuf_release(&url);
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}
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static int fetch_indices(struct walker *walker, struct alt_base *repo)
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{
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int ret;
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if (repo->got_indices)
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return 0;
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if (walker->get_verbosely)
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fprintf(stderr, "Getting pack list for %s\n", repo->base);
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switch (http_get_info_packs(repo->base, &repo->packs)) {
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case HTTP_OK:
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case HTTP_MISSING_TARGET:
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repo->got_indices = 1;
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ret = 0;
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break;
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default:
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repo->got_indices = 0;
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ret = -1;
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}
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return ret;
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}
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static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
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{
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struct packed_git *target;
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int ret;
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struct slot_results results;
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struct http_pack_request *preq;
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if (fetch_indices(walker, repo))
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return -1;
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target = find_sha1_pack(sha1, repo->packs);
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if (!target)
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return -1;
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close_pack_index(target);
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if (walker->get_verbosely) {
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fprintf(stderr, "Getting pack %s\n",
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hash_to_hex(target->hash));
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fprintf(stderr, " which contains %s\n",
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hash_to_hex(sha1));
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}
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preq = new_http_pack_request(target->hash, repo->base);
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if (preq == NULL)
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goto abort;
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preq->slot->results = &results;
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if (start_active_slot(preq->slot)) {
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run_active_slot(preq->slot);
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if (results.curl_result != CURLE_OK) {
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error("Unable to get pack file %s\n%s", preq->url,
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curl_errorstr);
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goto abort;
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}
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} else {
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error("Unable to start request");
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goto abort;
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}
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ret = finish_http_pack_request(preq);
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release_http_pack_request(preq);
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if (ret)
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return ret;
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http_install_packfile(target, &repo->packs);
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return 0;
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abort:
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return -1;
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}
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static void abort_object_request(struct object_request *obj_req)
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{
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release_object_request(obj_req);
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}
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static int fetch_object(struct walker *walker, unsigned char *hash)
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{
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char *hex = hash_to_hex(hash);
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int ret = 0;
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struct object_request *obj_req = NULL;
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struct http_object_request *req;
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struct list_head *pos, *head = &object_queue_head;
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list_for_each(pos, head) {
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obj_req = list_entry(pos, struct object_request, node);
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if (hasheq(obj_req->oid.hash, hash))
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break;
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}
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if (obj_req == NULL)
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return error("Couldn't find request for %s in the queue", hex);
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if (has_object_file(&obj_req->oid)) {
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if (obj_req->req != NULL)
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abort_http_object_request(obj_req->req);
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abort_object_request(obj_req);
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return 0;
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}
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#ifdef USE_CURL_MULTI
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while (obj_req->state == WAITING)
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step_active_slots();
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#else
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start_object_request(walker, obj_req);
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#endif
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/*
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* obj_req->req might change when fetching alternates in the callback
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* process_object_response; therefore, the "shortcut" variable, req,
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* is used only after we're done with slots.
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*/
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while (obj_req->state == ACTIVE)
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run_active_slot(obj_req->req->slot);
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req = obj_req->req;
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if (req->localfile != -1) {
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close(req->localfile);
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req->localfile = -1;
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}
|
|
|
|
normalize_curl_result(&req->curl_result, req->http_code,
|
|
req->errorstr, sizeof(req->errorstr));
|
|
|
|
if (obj_req->state == ABORTED) {
|
|
ret = error("Request for %s aborted", hex);
|
|
} else if (req->curl_result != CURLE_OK &&
|
|
req->http_code != 416) {
|
|
if (missing_target(req))
|
|
ret = -1; /* Be silent, it is probably in a pack. */
|
|
else
|
|
ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
|
|
req->errorstr, req->curl_result,
|
|
req->http_code, hex);
|
|
} else if (req->zret != Z_STREAM_END) {
|
|
walker->corrupt_object_found++;
|
|
ret = error("File %s (%s) corrupt", hex, req->url);
|
|
} else if (!oideq(&obj_req->oid, &req->real_oid)) {
|
|
ret = error("File %s has bad hash", hex);
|
|
} else if (req->rename < 0) {
|
|
struct strbuf buf = STRBUF_INIT;
|
|
loose_object_path(the_repository, &buf, &req->oid);
|
|
ret = error("unable to write sha1 filename %s", buf.buf);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
release_http_object_request(req);
|
|
release_object_request(obj_req);
|
|
return ret;
|
|
}
|
|
|
|
static int fetch(struct walker *walker, unsigned char *hash)
|
|
{
|
|
struct walker_data *data = walker->data;
|
|
struct alt_base *altbase = data->alt;
|
|
|
|
if (!fetch_object(walker, hash))
|
|
return 0;
|
|
while (altbase) {
|
|
if (!http_fetch_pack(walker, altbase, hash))
|
|
return 0;
|
|
fetch_alternates(walker, data->alt->base);
|
|
altbase = altbase->next;
|
|
}
|
|
return error("Unable to find %s under %s", hash_to_hex(hash),
|
|
data->alt->base);
|
|
}
|
|
|
|
static int fetch_ref(struct walker *walker, struct ref *ref)
|
|
{
|
|
struct walker_data *data = walker->data;
|
|
return http_fetch_ref(data->alt->base, ref);
|
|
}
|
|
|
|
static void cleanup(struct walker *walker)
|
|
{
|
|
struct walker_data *data = walker->data;
|
|
struct alt_base *alt, *alt_next;
|
|
|
|
if (data) {
|
|
alt = data->alt;
|
|
while (alt) {
|
|
alt_next = alt->next;
|
|
|
|
free(alt->base);
|
|
free(alt);
|
|
|
|
alt = alt_next;
|
|
}
|
|
free(data);
|
|
walker->data = NULL;
|
|
}
|
|
}
|
|
|
|
struct walker *get_http_walker(const char *url)
|
|
{
|
|
char *s;
|
|
struct walker_data *data = xmalloc(sizeof(struct walker_data));
|
|
struct walker *walker = xmalloc(sizeof(struct walker));
|
|
|
|
data->alt = xmalloc(sizeof(*data->alt));
|
|
data->alt->base = xstrdup(url);
|
|
for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
|
|
*s = 0;
|
|
|
|
data->alt->got_indices = 0;
|
|
data->alt->packs = NULL;
|
|
data->alt->next = NULL;
|
|
data->got_alternates = -1;
|
|
|
|
walker->corrupt_object_found = 0;
|
|
walker->fetch = fetch;
|
|
walker->fetch_ref = fetch_ref;
|
|
walker->prefetch = prefetch;
|
|
walker->cleanup = cleanup;
|
|
walker->data = data;
|
|
|
|
#ifdef USE_CURL_MULTI
|
|
add_fill_function(walker, (int (*)(void *)) fill_active_slot);
|
|
#endif
|
|
|
|
return walker;
|
|
}
|