diff options
Diffstat (limited to 'http-walker.c')
| -rw-r--r-- | http-walker.c | 1035 |
1 files changed, 1035 insertions, 0 deletions
diff --git a/http-walker.c b/http-walker.c new file mode 100644 index 0000000000..a3fb596542 --- /dev/null +++ b/http-walker.c @@ -0,0 +1,1035 @@ +#include "cache.h" +#include "commit.h" +#include "pack.h" +#include "walker.h" +#include "http.h" + +#define PREV_BUF_SIZE 4096 +#define RANGE_HEADER_SIZE 30 + +struct alt_base +{ + char *base; + int got_indices; + struct packed_git *packs; + struct alt_base *next; +}; + +enum object_request_state { + WAITING, + ABORTED, + ACTIVE, + COMPLETE, +}; + +struct object_request +{ + struct walker *walker; + unsigned char sha1[20]; + struct alt_base *repo; + char *url; + char filename[PATH_MAX]; + char tmpfile[PATH_MAX]; + int local; + enum object_request_state state; + CURLcode curl_result; + char errorstr[CURL_ERROR_SIZE]; + long http_code; + unsigned char real_sha1[20]; + SHA_CTX c; + z_stream stream; + int zret; + int rename; + struct active_request_slot *slot; + struct object_request *next; +}; + +struct alternates_request { + struct walker *walker; + const char *base; + char *url; + struct buffer *buffer; + struct active_request_slot *slot; + int http_specific; +}; + +struct walker_data { + const char *url; + int got_alternates; + struct alt_base *alt; + struct curl_slist *no_pragma_header; +}; + +static struct object_request *object_queue_head; + +static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb, + void *data) +{ + unsigned char expn[4096]; + size_t size = eltsize * nmemb; + int posn = 0; + struct object_request *obj_req = (struct object_request *)data; + do { + ssize_t retval = xwrite(obj_req->local, + (char *) ptr + posn, size - posn); + if (retval < 0) + return posn; + posn += retval; + } while (posn < size); + + obj_req->stream.avail_in = size; + obj_req->stream.next_in = ptr; + do { + obj_req->stream.next_out = expn; + obj_req->stream.avail_out = sizeof(expn); + obj_req->zret = inflate(&obj_req->stream, Z_SYNC_FLUSH); + SHA1_Update(&obj_req->c, expn, + sizeof(expn) - obj_req->stream.avail_out); + } while (obj_req->stream.avail_in && obj_req->zret == Z_OK); + data_received++; + return size; +} + +static int missing__target(int code, int result) +{ + return /* file:// URL -- do we ever use one??? */ + (result == CURLE_FILE_COULDNT_READ_FILE) || + /* http:// and https:// URL */ + (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) || + /* ftp:// URL */ + (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE) + ; +} + +#define missing_target(a) missing__target((a)->http_code, (a)->curl_result) + +static void fetch_alternates(struct walker *walker, const char *base); + +static void process_object_response(void *callback_data); + +static void start_object_request(struct walker *walker, + struct object_request *obj_req) +{ + char *hex = sha1_to_hex(obj_req->sha1); + char prevfile[PATH_MAX]; + char *url; + char *posn; + int prevlocal; + unsigned char prev_buf[PREV_BUF_SIZE]; + ssize_t prev_read = 0; + long prev_posn = 0; + char range[RANGE_HEADER_SIZE]; + struct curl_slist *range_header = NULL; + struct active_request_slot *slot; + struct walker_data *data = walker->data; + + snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename); + unlink(prevfile); + rename(obj_req->tmpfile, prevfile); + unlink(obj_req->tmpfile); + + if (obj_req->local != -1) + error("fd leakage in start: %d", obj_req->local); + obj_req->local = open(obj_req->tmpfile, + O_WRONLY | O_CREAT | O_EXCL, 0666); + /* This could have failed due to the "lazy directory creation"; + * try to mkdir the last path component. + */ + if (obj_req->local < 0 && errno == ENOENT) { + char *dir = strrchr(obj_req->tmpfile, '/'); + if (dir) { + *dir = 0; + mkdir(obj_req->tmpfile, 0777); + *dir = '/'; + } + obj_req->local = open(obj_req->tmpfile, + O_WRONLY | O_CREAT | O_EXCL, 0666); + } + + if (obj_req->local < 0) { + obj_req->state = ABORTED; + error("Couldn't create temporary file %s for %s: %s", + obj_req->tmpfile, obj_req->filename, strerror(errno)); + return; + } + + memset(&obj_req->stream, 0, sizeof(obj_req->stream)); + + inflateInit(&obj_req->stream); + + SHA1_Init(&obj_req->c); + + url = xmalloc(strlen(obj_req->repo->base) + 51); + obj_req->url = xmalloc(strlen(obj_req->repo->base) + 51); + strcpy(url, obj_req->repo->base); + posn = url + strlen(obj_req->repo->base); + strcpy(posn, "/objects/"); + posn += 9; + memcpy(posn, hex, 2); + posn += 2; + *(posn++) = '/'; + strcpy(posn, hex + 2); + strcpy(obj_req->url, url); + + /* If a previous temp file is present, process what was already + fetched. */ + prevlocal = open(prevfile, O_RDONLY); + if (prevlocal != -1) { + do { + prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE); + if (prev_read>0) { + if (fwrite_sha1_file(prev_buf, + 1, + prev_read, + obj_req) == prev_read) { + prev_posn += prev_read; + } else { + prev_read = -1; + } + } + } while (prev_read > 0); + close(prevlocal); + } + unlink(prevfile); + + /* Reset inflate/SHA1 if there was an error reading the previous temp + file; also rewind to the beginning of the local file. */ + if (prev_read == -1) { + memset(&obj_req->stream, 0, sizeof(obj_req->stream)); + inflateInit(&obj_req->stream); + SHA1_Init(&obj_req->c); + if (prev_posn>0) { + prev_posn = 0; + lseek(obj_req->local, 0, SEEK_SET); + ftruncate(obj_req->local, 0); + } + } + + slot = get_active_slot(); + slot->callback_func = process_object_response; + slot->callback_data = obj_req; + obj_req->slot = slot; + + curl_easy_setopt(slot->curl, CURLOPT_FILE, obj_req); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file); + curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, obj_req->errorstr); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header); + + /* If we have successfully processed data from a previous fetch + attempt, only fetch the data we don't already have. */ + if (prev_posn>0) { + if (walker->get_verbosely) + fprintf(stderr, + "Resuming fetch of object %s at byte %ld\n", + hex, prev_posn); + sprintf(range, "Range: bytes=%ld-", prev_posn); + range_header = curl_slist_append(range_header, range); + curl_easy_setopt(slot->curl, + CURLOPT_HTTPHEADER, range_header); + } + + /* Try to get the request started, abort the request on error */ + obj_req->state = ACTIVE; + if (!start_active_slot(slot)) { + obj_req->state = ABORTED; + obj_req->slot = NULL; + close(obj_req->local); obj_req->local = -1; + free(obj_req->url); + return; + } +} + +static void finish_object_request(struct object_request *obj_req) +{ + struct stat st; + + fchmod(obj_req->local, 0444); + close(obj_req->local); obj_req->local = -1; + + if (obj_req->http_code == 416) { + fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n"); + } else if (obj_req->curl_result != CURLE_OK) { + if (stat(obj_req->tmpfile, &st) == 0) + if (st.st_size == 0) + unlink(obj_req->tmpfile); + return; + } + + inflateEnd(&obj_req->stream); + SHA1_Final(obj_req->real_sha1, &obj_req->c); + if (obj_req->zret != Z_STREAM_END) { + unlink(obj_req->tmpfile); + return; + } + if (hashcmp(obj_req->sha1, obj_req->real_sha1)) { + unlink(obj_req->tmpfile); + return; + } + obj_req->rename = + move_temp_to_file(obj_req->tmpfile, obj_req->filename); + + if (obj_req->rename == 0) + walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1)); +} + +static void process_object_response(void *callback_data) +{ + struct object_request *obj_req = + (struct object_request *)callback_data; + struct walker *walker = obj_req->walker; + struct walker_data *data = walker->data; + struct alt_base *alt = data->alt; + + obj_req->curl_result = obj_req->slot->curl_result; + obj_req->http_code = obj_req->slot->http_code; + obj_req->slot = NULL; + obj_req->state = COMPLETE; + + /* Use alternates if necessary */ + if (missing_target(obj_req)) { + fetch_alternates(walker, alt->base); + if (obj_req->repo->next != NULL) { + obj_req->repo = + obj_req->repo->next; + close(obj_req->local); + obj_req->local = -1; + start_object_request(walker, obj_req); + return; + } + } + + finish_object_request(obj_req); +} + +static void release_object_request(struct object_request *obj_req) +{ + struct object_request *entry = object_queue_head; + + if (obj_req->local != -1) + error("fd leakage in release: %d", obj_req->local); + if (obj_req == object_queue_head) { + object_queue_head = obj_req->next; + } else { + while (entry->next != NULL && entry->next != obj_req) + entry = entry->next; + if (entry->next == obj_req) + entry->next = entry->next->next; + } + + free(obj_req->url); + free(obj_req); +} + +#ifdef USE_CURL_MULTI +static int fill_active_slot(struct walker *walker) +{ + struct object_request *obj_req; + + for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) { + if (obj_req->state == WAITING) { + if (has_sha1_file(obj_req->sha1)) + obj_req->state = COMPLETE; + else { + start_object_request(walker, obj_req); + return 1; + } + } + } + return 0; +} +#endif + +static void prefetch(struct walker *walker, unsigned char *sha1) +{ + struct object_request *newreq; + struct object_request *tail; + struct walker_data *data = walker->data; + char *filename = sha1_file_name(sha1); + + newreq = xmalloc(sizeof(*newreq)); + newreq->walker = walker; + hashcpy(newreq->sha1, sha1); + newreq->repo = data->alt; + newreq->url = NULL; + newreq->local = -1; + newreq->state = WAITING; + snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename); + snprintf(newreq->tmpfile, sizeof(newreq->tmpfile), + "%s.temp", filename); + newreq->slot = NULL; + newreq->next = NULL; + + if (object_queue_head == NULL) { + object_queue_head = newreq; + } else { + tail = object_queue_head; + while (tail->next != NULL) { + tail = tail->next; + } + tail->next = newreq; + } + +#ifdef USE_CURL_MULTI + fill_active_slots(); + step_active_slots(); +#endif +} + +static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1) +{ + char *hex = sha1_to_hex(sha1); + char *filename; + char *url; + char tmpfile[PATH_MAX]; + long prev_posn = 0; + char range[RANGE_HEADER_SIZE]; + struct curl_slist *range_header = NULL; + struct walker_data *data = walker->data; + + FILE *indexfile; + struct active_request_slot *slot; + struct slot_results results; + + if (has_pack_index(sha1)) + return 0; + + if (walker->get_verbosely) + fprintf(stderr, "Getting index for pack %s\n", hex); + + url = xmalloc(strlen(repo->base) + 64); + sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex); + + filename = sha1_pack_index_name(sha1); + snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename); + indexfile = fopen(tmpfile, "a"); + if (!indexfile) + return error("Unable to open local file %s for pack index", + tmpfile); + + slot = get_active_slot(); + slot->results = &results; + curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header); + slot->local = indexfile; + + /* If there is data present from a previous transfer attempt, + resume where it left off */ + prev_posn = ftell(indexfile); + if (prev_posn>0) { + if (walker->get_verbosely) + fprintf(stderr, + "Resuming fetch of index for pack %s at byte %ld\n", + hex, prev_posn); + sprintf(range, "Range: bytes=%ld-", prev_posn); + range_header = curl_slist_append(range_header, range); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header); + } + + if (start_active_slot(slot)) { + run_active_slot(slot); + if (results.curl_result != CURLE_OK) { + fclose(indexfile); + return error("Unable to get pack index %s\n%s", url, + curl_errorstr); + } + } else { + fclose(indexfile); + return error("Unable to start request"); + } + + fclose(indexfile); + + return move_temp_to_file(tmpfile, filename); +} + +static int setup_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1) +{ + struct packed_git *new_pack; + if (has_pack_file(sha1)) + return 0; /* don't list this as something we can get */ + + if (fetch_index(walker, repo, sha1)) + return -1; + + new_pack = parse_pack_index(sha1); + new_pack->next = repo->packs; + repo->packs = new_pack; + return 0; +} + +static void process_alternates_response(void *callback_data) +{ + struct alternates_request *alt_req = + (struct alternates_request *)callback_data; + struct walker *walker = alt_req->walker; + struct walker_data *cdata = walker->data; + struct active_request_slot *slot = alt_req->slot; + struct alt_base *tail = cdata->alt; + const char *base = alt_req->base; + static const char null_byte = '\0'; + char *data; + int i = 0; + + if (alt_req->http_specific) { + if (slot->curl_result != CURLE_OK || + !alt_req->buffer->posn) { + + /* Try reusing the slot to get non-http alternates */ + alt_req->http_specific = 0; + sprintf(alt_req->url, "%s/objects/info/alternates", + base); + curl_easy_setopt(slot->curl, CURLOPT_URL, + alt_req->url); + active_requests++; + slot->in_use = 1; + if (slot->finished != NULL) + (*slot->finished) = 0; + if (!start_active_slot(slot)) { + cdata->got_alternates = -1; + slot->in_use = 0; + if (slot->finished != NULL) + (*slot->finished) = 1; + } + return; + } + } else if (slot->curl_result != CURLE_OK) { + if (!missing_target(slot)) { + cdata->got_alternates = -1; + return; + } + } + + fwrite_buffer(&null_byte, 1, 1, alt_req->buffer); + alt_req->buffer->posn--; + data = alt_req->buffer->buffer; + + while (i < alt_req->buffer->posn) { + int posn = i; + while (posn < alt_req->buffer->posn && data[posn] != '\n') + posn++; + if (data[posn] == '\n') { + int okay = 0; + int serverlen = 0; + struct alt_base *newalt; + char *target = NULL; + if (data[i] == '/') { + /* This counts + * http://git.host/pub/scm/linux.git/ + * -----------here^ + * so memcpy(dst, base, serverlen) will + * copy up to "...git.host". + */ + const char *colon_ss = strstr(base,"://"); + if (colon_ss) { + serverlen = (strchr(colon_ss + 3, '/') + - base); + okay = 1; + } + } else if (!memcmp(data + i, "../", 3)) { + /* Relative URL; chop the corresponding + * number of subpath from base (and ../ + * from data), and concatenate the result. + * + * The code first drops ../ from data, and + * then drops one ../ from data and one path + * from base. IOW, one extra ../ is dropped + * from data than path is dropped from base. + * + * This is not wrong. The alternate in + * http://git.host/pub/scm/linux.git/ + * to borrow from + * http://git.host/pub/scm/linus.git/ + * is ../../linus.git/objects/. You need + * two ../../ to borrow from your direct + * neighbour. + */ + i += 3; + serverlen = strlen(base); + while (i + 2 < posn && + !memcmp(data + i, "../", 3)) { + do { + serverlen--; + } while (serverlen && + base[serverlen - 1] != '/'); + i += 3; + } + /* If the server got removed, give up. */ + okay = strchr(base, ':') - base + 3 < + serverlen; + } else if (alt_req->http_specific) { + char *colon = strchr(data + i, ':'); + char *slash = strchr(data + i, '/'); + if (colon && slash && colon < data + posn && + slash < data + posn && colon < slash) { + okay = 1; + } + } + /* skip "objects\n" at end */ + if (okay) { + target = xmalloc(serverlen + posn - i - 6); + memcpy(target, base, serverlen); + memcpy(target + serverlen, data + i, + posn - i - 7); + target[serverlen + posn - i - 7] = 0; + if (walker->get_verbosely) + fprintf(stderr, + "Also look at %s\n", target); + newalt = xmalloc(sizeof(*newalt)); + newalt->next = NULL; + newalt->base = target; + newalt->got_indices = 0; + newalt->packs = NULL; + + while (tail->next != NULL) + tail = tail->next; + tail->next = newalt; + } + } + i = posn + 1; + } + + cdata->got_alternates = 1; +} + +static void fetch_alternates(struct walker *walker, const char *base) +{ + struct buffer buffer; + char *url; + char *data; + struct active_request_slot *slot; + struct alternates_request alt_req; + struct walker_data *cdata = walker->data; + + /* If another request has already started fetching alternates, + wait for them to arrive and return to processing this request's + curl message */ +#ifdef USE_CURL_MULTI + while (cdata->got_alternates == 0) { + step_active_slots(); + } +#endif + + /* Nothing to do if they've already been fetched */ + if (cdata->got_alternates == 1) + return; + + /* Start the fetch */ + cdata->got_alternates = 0; + + data = xmalloc(4096); + buffer.size = 4096; + buffer.posn = 0; + buffer.buffer = data; + + if (walker->get_verbosely) + fprintf(stderr, "Getting alternates list for %s\n", base); + + url = xmalloc(strlen(base) + 31); + sprintf(url, "%s/objects/info/http-alternates", base); + + /* Use a callback to process the result, since another request + may fail and need to have alternates loaded before continuing */ + slot = get_active_slot(); + slot->callback_func = process_alternates_response; + alt_req.walker = walker; + slot->callback_data = &alt_req; + + curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + + alt_req.base = base; + alt_req.url = url; + alt_req.buffer = &buffer; + alt_req.http_specific = 1; + alt_req.slot = slot; + + if (start_active_slot(slot)) + run_active_slot(slot); + else + cdata->got_alternates = -1; + + free(data); + free(url); +} + +static int fetch_indices(struct walker *walker, struct alt_base *repo) +{ + unsigned char sha1[20]; + char *url; + struct buffer buffer; + char *data; + int i = 0; + + struct active_request_slot *slot; + struct slot_results results; + + if (repo->got_indices) + return 0; + + data = xmalloc(4096); + buffer.size = 4096; + buffer.posn = 0; + buffer.buffer = data; + + if (walker->get_verbosely) + fprintf(stderr, "Getting pack list for %s\n", repo->base); + + url = xmalloc(strlen(repo->base) + 21); + sprintf(url, "%s/objects/info/packs", repo->base); + + slot = get_active_slot(); + slot->results = &results; + curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL); + if (start_active_slot(slot)) { + run_active_slot(slot); + if (results.curl_result != CURLE_OK) { + if (missing_target(&results)) { + repo->got_indices = 1; + free(buffer.buffer); + return 0; + } else { + repo->got_indices = 0; + free(buffer.buffer); + return error("%s", curl_errorstr); + } + } + } else { + repo->got_indices = 0; + free(buffer.buffer); + return error("Unable to start request"); + } + + data = buffer.buffer; + while (i < buffer.posn) { + switch (data[i]) { + case 'P': + i++; + if (i + 52 <= buffer.posn && + !prefixcmp(data + i, " pack-") && + !prefixcmp(data + i + 46, ".pack\n")) { + get_sha1_hex(data + i + 6, sha1); + setup_index(walker, repo, sha1); + i += 51; + break; + } + default: + while (i < buffer.posn && data[i] != '\n') + i++; + } + i++; + } + + free(buffer.buffer); + repo->got_indices = 1; + return 0; +} + +static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1) +{ + char *url; + struct packed_git *target; + struct packed_git **lst; + FILE *packfile; + char *filename; + char tmpfile[PATH_MAX]; + int ret; + long prev_posn = 0; + char range[RANGE_HEADER_SIZE]; + struct curl_slist *range_header = NULL; + struct walker_data *data = walker->data; + + struct active_request_slot *slot; + struct slot_results results; + + if (fetch_indices(walker, repo)) + return -1; + target = find_sha1_pack(sha1, repo->packs); + if (!target) + return -1; + + if (walker->get_verbosely) { + fprintf(stderr, "Getting pack %s\n", + sha1_to_hex(target->sha1)); + fprintf(stderr, " which contains %s\n", + sha1_to_hex(sha1)); + } + + url = xmalloc(strlen(repo->base) + 65); + sprintf(url, "%s/objects/pack/pack-%s.pack", + repo->base, sha1_to_hex(target->sha1)); + + filename = sha1_pack_name(target->sha1); + snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename); + packfile = fopen(tmpfile, "a"); + if (!packfile) + return error("Unable to open local file %s for pack", + tmpfile); + + slot = get_active_slot(); + slot->results = &results; + curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header); + slot->local = packfile; + + /* If there is data present from a previous transfer attempt, + resume where it left off */ + prev_posn = ftell(packfile); + if (prev_posn>0) { + if (walker->get_verbosely) + fprintf(stderr, + "Resuming fetch of pack %s at byte %ld\n", + sha1_to_hex(target->sha1), prev_posn); + sprintf(range, "Range: bytes=%ld-", prev_posn); + range_header = curl_slist_append(range_header, range); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header); + } + + if (start_active_slot(slot)) { + run_active_slot(slot); + if (results.curl_result != CURLE_OK) { + fclose(packfile); + return error("Unable to get pack file %s\n%s", url, + curl_errorstr); + } + } else { + fclose(packfile); + return error("Unable to start request"); + } + + target->pack_size = ftell(packfile); + fclose(packfile); + + ret = move_temp_to_file(tmpfile, filename); + if (ret) + return ret; + + lst = &repo->packs; + while (*lst != target) + lst = &((*lst)->next); + *lst = (*lst)->next; + + if (verify_pack(target, 0)) + return -1; + install_packed_git(target); + + return 0; +} + +static void abort_object_request(struct object_request *obj_req) +{ + if (obj_req->local >= 0) { + close(obj_req->local); + obj_req->local = -1; + } + unlink(obj_req->tmpfile); + if (obj_req->slot) { + release_active_slot(obj_req->slot); + obj_req->slot = NULL; + } + release_object_request(obj_req); +} + +static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1) +{ + char *hex = sha1_to_hex(sha1); + int ret = 0; + struct object_request *obj_req = object_queue_head; + + while (obj_req != NULL && hashcmp(obj_req->sha1, sha1)) + obj_req = obj_req->next; + if (obj_req == NULL) + return error("Couldn't find request for %s in the queue", hex); + + if (has_sha1_file(obj_req->sha1)) { + abort_object_request(obj_req); + return 0; + } + +#ifdef USE_CURL_MULTI + while (obj_req->state == WAITING) { + step_active_slots(); + } +#else + start_object_request(walker, obj_req); +#endif + + while (obj_req->state == ACTIVE) { + run_active_slot(obj_req->slot); + } + if (obj_req->local != -1) { + close(obj_req->local); obj_req->local = -1; + } + + if (obj_req->state == ABORTED) { + ret = error("Request for %s aborted", hex); + } else if (obj_req->curl_result != CURLE_OK && + obj_req->http_code != 416) { + if (missing_target(obj_req)) + ret = -1; /* Be silent, it is probably in a pack. */ + else + ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)", + obj_req->errorstr, obj_req->curl_result, + obj_req->http_code, hex); + } else if (obj_req->zret != Z_STREAM_END) { + walker->corrupt_object_found++; + ret = error("File %s (%s) corrupt", hex, obj_req->url); + } else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) { + ret = error("File %s has bad hash", hex); + } else if (obj_req->rename < 0) { + ret = error("unable to write sha1 filename %s", + obj_req->filename); + } + + release_object_request(obj_req); + return ret; +} + +static int fetch(struct walker *walker, unsigned char *sha1) +{ + struct walker_data *data = walker->data; + struct alt_base *altbase = data->alt; + + if (!fetch_object(walker, altbase, sha1)) + return 0; + while (altbase) { + if (!fetch_pack(walker, altbase, sha1)) + return 0; + fetch_alternates(walker, data->alt->base); + altbase = altbase->next; + } + return error("Unable to find %s under %s", sha1_to_hex(sha1), + data->alt->base); +} + +static inline int needs_quote(int ch) +{ + if (((ch >= 'A') && (ch <= 'Z')) + || ((ch >= 'a') && (ch <= 'z')) + || ((ch >= '0') && (ch <= '9')) + || (ch == '/') + || (ch == '-') + || (ch == '.')) + return 0; + return 1; +} + +static inline int hex(int v) +{ + if (v < 10) return '0' + v; + else return 'A' + v - 10; +} + +static char *quote_ref_url(const char *base, const char *ref) +{ + const char *cp; + char *dp, *qref; + int len, baselen, ch; + + baselen = strlen(base); + len = baselen + 7; /* "/refs/" + NUL */ + for (cp = ref; (ch = *cp) != 0; cp++, len++) + if (needs_quote(ch)) + len += 2; /* extra two hex plus replacement % */ + qref = xmalloc(len); + memcpy(qref, base, baselen); + memcpy(qref + baselen, "/refs/", 6); + for (cp = ref, dp = qref + baselen + 6; (ch = *cp) != 0; cp++) { + if (needs_quote(ch)) { + *dp++ = '%'; + *dp++ = hex((ch >> 4) & 0xF); + *dp++ = hex(ch & 0xF); + } + else + *dp++ = ch; + } + *dp = 0; + + return qref; +} + +static int fetch_ref(struct walker *walker, char *ref, unsigned char *sha1) +{ + char *url; + char hex[42]; + struct buffer buffer; + struct walker_data *data = walker->data; + const char *base = data->alt->base; + struct active_request_slot *slot; + struct slot_results results; + buffer.size = 41; + buffer.posn = 0; + buffer.buffer = hex; + hex[41] = '\0'; + + url = quote_ref_url(base, ref); + slot = get_active_slot(); + slot->results = &results; + curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + if (start_active_slot(slot)) { + run_active_slot(slot); + if (results.curl_result != CURLE_OK) + return error("Couldn't get %s for %s\n%s", + url, ref, curl_errorstr); + } else { + return error("Unable to start request"); + } + + hex[40] = '\0'; + get_sha1_hex(hex, sha1); + return 0; +} + +static void cleanup(struct walker *walker) +{ + struct walker_data *data = walker->data; + http_cleanup(); + + curl_slist_free_all(data->no_pragma_header); +} + +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)); + + http_init(); + + data->no_pragma_header = curl_slist_append(NULL, "Pragma:"); + + data->alt = xmalloc(sizeof(*data->alt)); + data->alt->base = xmalloc(strlen(url) + 1); + strcpy(data->alt->base, 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; +} |