#include "cache.h"
#include "commit.h"
-
+#include "pack.h"
#include "fetch.h"
+#include "http.h"
-#include <curl/curl.h>
-#include <curl/easy.h>
-
-#if LIBCURL_VERSION_NUM < 0x070704
-#define curl_global_cleanup() do { /* nothing */ } while(0)
-#endif
-#if LIBCURL_VERSION_NUM < 0x070800
-#define curl_global_init(a) do { /* nothing */ } while(0)
-#endif
+#define PREV_BUF_SIZE 4096
+#define RANGE_HEADER_SIZE 30
-static CURL *curl;
+static int got_alternates = -1;
-static char *base;
+static struct curl_slist *no_pragma_header;
-static SHA_CTX c;
-static z_stream stream;
+struct alt_base
+{
+ char *base;
+ int got_indices;
+ struct packed_git *packs;
+ struct alt_base *next;
+};
-static int local;
-static int zret;
+static struct alt_base *alt = NULL;
-static int curl_ssl_verify;
+enum object_request_state {
+ WAITING,
+ ABORTED,
+ ACTIVE,
+ COMPLETE,
+};
-struct buffer
+struct object_request
{
- size_t posn;
- size_t size;
- void *buffer;
+ 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;
};
-static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
- struct buffer *buffer)
-{
- size_t size = eltsize * nmemb;
- if (size > buffer->size - buffer->posn)
- size = buffer->size - buffer->posn;
- memcpy(buffer->buffer + buffer->posn, ptr, size);
- buffer->posn += size;
- return size;
-}
+struct alternates_request {
+ char *base;
+ char *url;
+ struct buffer *buffer;
+ struct active_request_slot *slot;
+ int http_specific;
+};
+
+static struct object_request *object_queue_head = NULL;
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 = write(local, ptr + posn, size - posn);
+ ssize_t retval = write(obj_req->local,
+ ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);
- stream.avail_in = size;
- stream.next_in = ptr;
+ obj_req->stream.avail_in = size;
+ obj_req->stream.next_in = ptr;
do {
- stream.next_out = expn;
- stream.avail_out = sizeof(expn);
- zret = inflate(&stream, Z_SYNC_FLUSH);
- SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
- } while (stream.avail_in && zret == Z_OK);
+ 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;
}
-void prefetch(unsigned char *sha1)
+static void fetch_alternates(char *base);
+
+static void process_object_response(void *callback_data);
+
+static void start_object_request(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;
+
+ 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\n",
+ 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) + 50);
+ obj_req->url = xmalloc(strlen(obj_req->repo->base) + 50);
+ strcpy(url, obj_req->repo->base);
+ posn = url + strlen(obj_req->repo->base);
+ strcpy(posn, "objects/");
+ posn += 8;
+ 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 = read(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, SEEK_SET, 0);
+ 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, 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 (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 int got_indices = 0;
+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;
+ }
-static struct packed_git *packs = NULL;
+ 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 (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
+ unlink(obj_req->tmpfile);
+ return;
+ }
+ obj_req->rename =
+ move_temp_to_file(obj_req->tmpfile, obj_req->filename);
+
+ if (obj_req->rename == 0)
+ pull_say("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;
+
+ 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 (obj_req->http_code == 404) {
+ fetch_alternates(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(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;
+ }
-static int fetch_index(unsigned char *sha1)
+ free(obj_req->url);
+ free(obj_req);
+}
+
+#ifdef USE_CURL_MULTI
+void fill_active_slots(void)
+{
+ struct object_request *obj_req = object_queue_head;
+ struct active_request_slot *slot = active_queue_head;
+ int num_transfers;
+
+ while (active_requests < max_requests && obj_req != NULL) {
+ if (obj_req->state == WAITING) {
+ if (has_sha1_file(obj_req->sha1))
+ release_object_request(obj_req);
+ else
+ start_object_request(obj_req);
+ curl_multi_perform(curlm, &num_transfers);
+ }
+ obj_req = obj_req->next;
+ }
+
+ while (slot != NULL) {
+ if (!slot->in_use && slot->curl != NULL) {
+ curl_easy_cleanup(slot->curl);
+ slot->curl = NULL;
+ }
+ slot = slot->next;
+ }
+}
+#endif
+
+void prefetch(unsigned char *sha1)
{
+ struct object_request *newreq;
+ struct object_request *tail;
+ char *filename = sha1_file_name(sha1);
+
+ newreq = xmalloc(sizeof(*newreq));
+ memcpy(newreq->sha1, sha1, 20);
+ newreq->repo = 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->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 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;
FILE *indexfile;
+ struct active_request_slot *slot;
if (has_pack_index(sha1))
return 0;
if (get_verbosely)
- fprintf(stderr, "Getting index for pack %s\n",
- sha1_to_hex(sha1));
+ fprintf(stderr, "Getting index for pack %s\n", hex);
- url = xmalloc(strlen(base) + 64);
- sprintf(url, "%s/objects/pack/pack-%s.idx",
- base, sha1_to_hex(sha1));
+ url = xmalloc(strlen(repo->base) + 64);
+ sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
filename = sha1_pack_index_name(sha1);
- indexfile = fopen(filename, "w");
+ snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
+ indexfile = fopen(tmpfile, "a");
if (!indexfile)
return error("Unable to open local file %s for pack index",
filename);
- curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
- curl_easy_setopt(curl, CURLOPT_URL, url);
-
- if (curl_easy_perform(curl)) {
+ slot = get_active_slot();
+ 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, 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 (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 (slot->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 get pack index %s", url);
+ return error("Unable to start request");
}
fclose(indexfile);
- return 0;
+
+ return move_temp_to_file(tmpfile, filename);
}
-static int setup_index(unsigned char *sha1)
+static int setup_index(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(sha1))
+ if (fetch_index(repo, sha1))
return -1;
new_pack = parse_pack_index(sha1);
- new_pack->next = packs;
- packs = new_pack;
+ new_pack->next = repo->packs;
+ repo->packs = new_pack;
return 0;
}
-static int fetch_indices(void)
+static void process_alternates_response(void *callback_data)
+{
+ struct alternates_request *alt_req =
+ (struct alternates_request *)callback_data;
+ struct active_request_slot *slot = alt_req->slot;
+ struct alt_base *tail = alt;
+ 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 (start_active_slot(slot)) {
+ return;
+ } else {
+ got_alternates = -1;
+ slot->in_use = 0;
+ return;
+ }
+ }
+ } else if (slot->curl_result != CURLE_OK) {
+ if (slot->http_code != 404) {
+ 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] == '/') {
+ serverlen = strchr(base + 8, '/') - base;
+ okay = 1;
+ } else if (!memcmp(data + i, "../", 3)) {
+ 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' at end
+ if (okay) {
+ target = xmalloc(serverlen + posn - i - 6);
+ strncpy(target, base, serverlen);
+ strncpy(target + serverlen, data + i,
+ posn - i - 7);
+ target[serverlen + posn - i - 7] = '\0';
+ if (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;
+ }
+
+ got_alternates = 1;
+}
+
+static void fetch_alternates(char *base)
+{
+ struct buffer buffer;
+ char *url;
+ char *data;
+ struct active_request_slot *slot;
+ static struct alternates_request alt_req;
+
+ /* 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 (got_alternates == 0) {
+ step_active_slots();
+ }
+#endif
+
+ /* Nothing to do if they've already been fetched */
+ if (got_alternates == 1)
+ return;
+
+ /* Start the fetch */
+ got_alternates = 0;
+
+ data = xmalloc(4096);
+ buffer.size = 4096;
+ buffer.posn = 0;
+ buffer.buffer = data;
+
+ if (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;
+ 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
+ got_alternates = -1;
+
+ free(data);
+ free(url);
+}
+
+static int fetch_indices(struct alt_base *repo)
{
unsigned char sha1[20];
char *url;
char *data;
int i = 0;
- if (got_indices)
+ struct active_request_slot *slot;
+
+ if (repo->got_indices)
return 0;
data = xmalloc(4096);
buffer.buffer = data;
if (get_verbosely)
- fprintf(stderr, "Getting pack list\n");
-
- url = xmalloc(strlen(base) + 21);
- sprintf(url, "%s/objects/info/packs", base);
-
- curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
- curl_easy_setopt(curl, CURLOPT_URL, url);
+ fprintf(stderr, "Getting pack list for %s\n", repo->base);
- if (curl_easy_perform(curl)) {
- return error("Unable to get pack index %s", url);
+ url = xmalloc(strlen(repo->base) + 21);
+ sprintf(url, "%s/objects/info/packs", repo->base);
+
+ slot = get_active_slot();
+ 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 (slot->curl_result != CURLE_OK) {
+ if (slot->http_code == 404) {
+ 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");
}
- do {
+ data = buffer.buffer;
+ while (i < buffer.posn) {
switch (data[i]) {
case 'P':
i++;
!strncmp(data + i, " pack-", 6) &&
!strncmp(data + i + 46, ".pack\n", 6)) {
get_sha1_hex(data + i + 6, sha1);
- setup_index(sha1);
+ setup_index(repo, sha1);
i += 51;
break;
}
i++;
}
i++;
- } while (i < buffer.posn);
+ }
- got_indices = 1;
+ free(buffer.buffer);
+ repo->got_indices = 1;
return 0;
}
-static int fetch_pack(unsigned char *sha1)
+static int fetch_pack(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 active_request_slot *slot;
- if (fetch_indices())
+ if (fetch_indices(repo))
return -1;
- target = find_sha1_pack(sha1, packs);
+ target = find_sha1_pack(sha1, repo->packs);
if (!target)
- return error("Couldn't get %s: not separate or in any pack",
- sha1_to_hex(sha1));
+ return -1;
if (get_verbosely) {
fprintf(stderr, "Getting pack %s\n",
sha1_to_hex(sha1));
}
- url = xmalloc(strlen(base) + 65);
+ url = xmalloc(strlen(repo->base) + 65);
sprintf(url, "%s/objects/pack/pack-%s.pack",
- base, sha1_to_hex(target->sha1));
+ repo->base, sha1_to_hex(target->sha1));
filename = sha1_pack_name(target->sha1);
- packfile = fopen(filename, "w");
+ snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
+ packfile = fopen(tmpfile, "a");
if (!packfile)
return error("Unable to open local file %s for pack",
filename);
- curl_easy_setopt(curl, CURLOPT_FILE, packfile);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
- curl_easy_setopt(curl, CURLOPT_URL, url);
-
- if (curl_easy_perform(curl)) {
+ slot = get_active_slot();
+ 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, 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 (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 (slot->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 get pack file %s", url);
+ return error("Unable to start request");
}
fclose(packfile);
- lst = &packs;
+ 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;
}
-int fetch(unsigned char *sha1)
+static int fetch_object(struct alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
- char *filename = sha1_file_name(sha1);
- unsigned char real_sha1[20];
- char *url;
- char *posn;
+ int ret = 0;
+ struct object_request *obj_req = object_queue_head;
- local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+ while (obj_req != NULL && memcmp(obj_req->sha1, sha1, 20))
+ obj_req = obj_req->next;
+ if (obj_req == NULL)
+ return error("Couldn't find request for %s in the queue", hex);
- if (local < 0)
- return error("Couldn't open local object %s\n", filename);
-
- memset(&stream, 0, sizeof(stream));
+ if (has_sha1_file(obj_req->sha1)) {
+ release_object_request(obj_req);
+ return 0;
+ }
- inflateInit(&stream);
+#ifdef USE_CURL_MULTI
+ while (obj_req->state == WAITING) {
+ step_active_slots();
+ }
+#else
+ start_object_request(obj_req);
+#endif
- SHA1_Init(&c);
+ while (obj_req->state == ACTIVE) {
+ run_active_slot(obj_req->slot);
+ }
+ if (obj_req->local != -1) {
+ close(obj_req->local); obj_req->local = -1;
+ }
- curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
- curl_easy_setopt(curl, CURLOPT_FILE, NULL);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
+ 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 (obj_req->http_code == 404)
+ 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) {
+ ret = error("File %s (%s) corrupt\n", hex, obj_req->url);
+ } else if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
+ ret = error("File %s has bad hash\n", hex);
+ } else if (obj_req->rename < 0) {
+ ret = error("unable to write sha1 filename %s: %s",
+ obj_req->filename,
+ strerror(obj_req->rename));
+ }
- url = xmalloc(strlen(base) + 50);
- strcpy(url, base);
- posn = url + strlen(base);
- strcpy(posn, "objects/");
- posn += 8;
- memcpy(posn, hex, 2);
- posn += 2;
- *(posn++) = '/';
- strcpy(posn, hex + 2);
+ release_object_request(obj_req);
+ return ret;
+}
- curl_easy_setopt(curl, CURLOPT_URL, url);
+int fetch(unsigned char *sha1)
+{
+ struct alt_base *altbase = alt;
- if (curl_easy_perform(curl)) {
- unlink(filename);
- if (fetch_pack(sha1))
- return error("Tried %s", url);
+ if (!fetch_object(altbase, sha1))
return 0;
+ while (altbase) {
+ if (!fetch_pack(altbase, sha1))
+ return 0;
+ fetch_alternates(alt->base);
+ altbase = altbase->next;
}
+ return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
+ alt->base);
+}
- close(local);
- inflateEnd(&stream);
- SHA1_Final(real_sha1, &c);
- if (zret != Z_STREAM_END) {
- unlink(filename);
- return error("File %s (%s) corrupt\n", hex, url);
+static inline int needs_quote(int ch)
+{
+ switch (ch) {
+ case '/': case '-': case '.':
+ case 'A'...'Z': case 'a'...'z': case '0'...'9':
+ return 0;
+ default:
+ return 1;
}
- if (memcmp(sha1, real_sha1, 20)) {
- unlink(filename);
- return error("File %s has bad hash\n", hex);
+}
+
+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 + 6; /* "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/", 5);
+ for (cp = ref, dp = qref + baselen + 5; (ch = *cp) != 0; cp++) {
+ if (needs_quote(ch)) {
+ *dp++ = '%';
+ *dp++ = hex((ch >> 4) & 0xF);
+ *dp++ = hex(ch & 0xF);
+ }
+ else
+ *dp++ = ch;
}
-
- pull_say("got %s\n", hex);
- return 0;
+ *dp = 0;
+
+ return qref;
}
int fetch_ref(char *ref, unsigned char *sha1)
{
- char *url, *posn;
+ char *url;
char hex[42];
struct buffer buffer;
+ char *base = alt->base;
+ struct active_request_slot *slot;
buffer.size = 41;
buffer.posn = 0;
buffer.buffer = hex;
hex[41] = '\0';
- curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
-
- url = xmalloc(strlen(base) + 6 + strlen(ref));
- strcpy(url, base);
- posn = url + strlen(base);
- strcpy(posn, "refs/");
- posn += 5;
- strcpy(posn, ref);
-
- curl_easy_setopt(curl, CURLOPT_URL, url);
-
- if (curl_easy_perform(curl))
- return error("Couldn't get %s for %s\n", url, ref);
+ url = quote_ref_url(base, ref);
+ slot = get_active_slot();
+ 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 (slot->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);
char *commit_id;
char *url;
int arg = 1;
+ int rc = 0;
+
+ setup_git_directory();
while (arg < argc && argv[arg][0] == '-') {
if (argv[arg][1] == 't') {
} else if (argv[arg][1] == 'w') {
write_ref = argv[arg + 1];
arg++;
+ } else if (!strcmp(argv[arg], "--recover")) {
+ get_recover = 1;
}
arg++;
}
commit_id = argv[arg];
url = argv[arg + 1];
- curl_global_init(CURL_GLOBAL_ALL);
+ http_init();
- curl = curl_easy_init();
+ no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
- curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
- curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
-#if LIBCURL_VERSION_NUM >= 0x070907
- curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
-#endif
-
- base = url;
+ alt = xmalloc(sizeof(*alt));
+ alt->base = url;
+ alt->got_indices = 0;
+ alt->packs = NULL;
+ alt->next = NULL;
if (pull(commit_id))
- return 1;
+ rc = 1;
- curl_global_cleanup();
- return 0;
+ curl_slist_free_all(no_pragma_header);
+
+ http_cleanup();
+
+ return rc;
}