#include "cache.h"
#include "commit.h"
-
+#include "pack.h"
#include "fetch.h"
#include <curl/curl.h>
#include <curl/easy.h>
+#if LIBCURL_VERSION_NUM >= 0x070908
+#define USE_CURL_MULTI
+#define DEFAULT_MAX_REQUESTS 5
+#endif
+
#if LIBCURL_VERSION_NUM < 0x070704
#define curl_global_cleanup() do { /* nothing */ } while(0)
#endif
#define curl_global_init(a) do { /* nothing */ } while(0)
#endif
-static CURL *curl;
-static struct curl_slist *no_pragma_header;
+#if LIBCURL_VERSION_NUM < 0x070c04
+#define NO_CURL_EASY_DUPHANDLE
+#endif
-static char *initial_base;
+#define PREV_BUF_SIZE 4096
+#define RANGE_HEADER_SIZE 30
+
+static int got_alternates = -1;
+static int active_requests = 0;
+static int data_received;
+
+#ifdef USE_CURL_MULTI
+static int max_requests = -1;
+static CURLM *curlm;
+#endif
+#ifndef NO_CURL_EASY_DUPHANDLE
+static CURL *curl_default;
+#endif
+static struct curl_slist *pragma_header;
+static struct curl_slist *no_pragma_header;
+static struct curl_slist *no_range_header;
+static char curl_errorstr[CURL_ERROR_SIZE];
struct alt_base
{
struct alt_base *next;
};
-struct alt_base *alt = NULL;
+static struct alt_base *alt = NULL;
-static SHA_CTX c;
-static z_stream stream;
+enum transfer_state {
+ WAITING,
+ ABORTED,
+ ACTIVE,
+ COMPLETE,
+};
-static int local;
-static int zret;
+struct transfer_request
+{
+ unsigned char sha1[20];
+ struct alt_base *repo;
+ char *url;
+ char filename[PATH_MAX];
+ char tmpfile[PATH_MAX];
+ int local;
+ enum transfer_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 transfer_request *next;
+};
-static int curl_ssl_verify;
+struct active_request_slot
+{
+ CURL *curl;
+ FILE *local;
+ int in_use;
+ int done;
+ CURLcode curl_result;
+ long http_code;
+ void *callback_data;
+ void (*callback_func)(void *data);
+ struct active_request_slot *next;
+};
+
+struct alt_request {
+ char *base;
+ char *url;
+ struct buffer *buffer;
+ struct active_request_slot *slot;
+ int http_specific;
+};
+
+static struct transfer_request *request_queue_head = NULL;
+static struct active_request_slot *active_queue_head = NULL;
+
+static int curl_ssl_verify = -1;
+static char *ssl_cert = NULL;
+#if LIBCURL_VERSION_NUM >= 0x070902
+static char *ssl_key = NULL;
+#endif
+#if LIBCURL_VERSION_NUM >= 0x070908
+static char *ssl_capath = NULL;
+#endif
+static char *ssl_cainfo = NULL;
+static long curl_low_speed_limit = -1;
+static long curl_low_speed_time = -1;
struct buffer
{
void *buffer;
};
+static int http_options(const char *var, const char *value)
+{
+ if (!strcmp("http.sslverify", var)) {
+ if (curl_ssl_verify == -1) {
+ curl_ssl_verify = git_config_bool(var, value);
+ }
+ return 0;
+ }
+
+ if (!strcmp("http.sslcert", var)) {
+ if (ssl_cert == NULL) {
+ ssl_cert = xmalloc(strlen(value)+1);
+ strcpy(ssl_cert, value);
+ }
+ return 0;
+ }
+#if LIBCURL_VERSION_NUM >= 0x070902
+ if (!strcmp("http.sslkey", var)) {
+ if (ssl_key == NULL) {
+ ssl_key = xmalloc(strlen(value)+1);
+ strcpy(ssl_key, value);
+ }
+ return 0;
+ }
+#endif
+#if LIBCURL_VERSION_NUM >= 0x070908
+ if (!strcmp("http.sslcapath", var)) {
+ if (ssl_capath == NULL) {
+ ssl_capath = xmalloc(strlen(value)+1);
+ strcpy(ssl_capath, value);
+ }
+ return 0;
+ }
+#endif
+ if (!strcmp("http.sslcainfo", var)) {
+ if (ssl_cainfo == NULL) {
+ ssl_cainfo = xmalloc(strlen(value)+1);
+ strcpy(ssl_cainfo, value);
+ }
+ return 0;
+ }
+
+#ifdef USE_CURL_MULTI
+ if (!strcmp("http.maxrequests", var)) {
+ if (max_requests == -1)
+ max_requests = git_config_int(var, value);
+ return 0;
+ }
+#endif
+
+ if (!strcmp("http.lowspeedlimit", var)) {
+ if (curl_low_speed_limit == -1)
+ curl_low_speed_limit = (long)git_config_int(var, value);
+ return 0;
+ }
+ if (!strcmp("http.lowspeedtime", var)) {
+ if (curl_low_speed_time == -1)
+ curl_low_speed_time = (long)git_config_int(var, value);
+ return 0;
+ }
+
+ /* Fall back on the default ones */
+ return git_default_config(var, value);
+}
+
static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
struct buffer *buffer)
{
size = buffer->size - buffer->posn;
memcpy(buffer->buffer + buffer->posn, ptr, size);
buffer->posn += size;
+ data_received++;
return size;
}
+static size_t fwrite_buffer_dynamic(const void *ptr, size_t eltsize,
+ size_t nmemb, struct buffer *buffer)
+{
+ size_t size = eltsize * nmemb;
+ if (size > buffer->size - buffer->posn) {
+ buffer->size = buffer->size * 3 / 2;
+ if (buffer->size < buffer->posn + size)
+ buffer->size = buffer->posn + size;
+ buffer->buffer = xrealloc(buffer->buffer, buffer->size);
+ }
+ memcpy(buffer->buffer + buffer->posn, ptr, size);
+ buffer->posn += size;
+ data_received++;
+ return size;
+}
+
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 transfer_request *request = (struct transfer_request *)data;
do {
- ssize_t retval = write(local, ptr + posn, size - posn);
+ ssize_t retval = write(request->local,
+ ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);
- stream.avail_in = size;
- stream.next_in = ptr;
+ request->stream.avail_in = size;
+ request->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);
+ request->stream.next_out = expn;
+ request->stream.avail_out = sizeof(expn);
+ request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
+ SHA1_Update(&request->c, expn,
+ sizeof(expn) - request->stream.avail_out);
+ } while (request->stream.avail_in && request->zret == Z_OK);
+ data_received++;
return size;
}
-void prefetch(unsigned char *sha1)
+#ifdef USE_CURL_MULTI
+static void process_curl_messages(void);
+static void process_request_queue(void);
+#endif
+static void fetch_alternates(char *base);
+
+static CURL* get_curl_handle(void)
+{
+ CURL* result = curl_easy_init();
+
+ curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
+#if LIBCURL_VERSION_NUM >= 0x070907
+ curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
+#endif
+
+ if (ssl_cert != NULL)
+ curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
+#if LIBCURL_VERSION_NUM >= 0x070902
+ if (ssl_key != NULL)
+ curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
+#endif
+#if LIBCURL_VERSION_NUM >= 0x070908
+ if (ssl_capath != NULL)
+ curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
+#endif
+ if (ssl_cainfo != NULL)
+ curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
+ curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
+
+ if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
+ curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
+ curl_low_speed_limit);
+ curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
+ curl_low_speed_time);
+ }
+
+ curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
+
+ return result;
+}
+
+static struct active_request_slot *get_active_slot(void)
+{
+ struct active_request_slot *slot = active_queue_head;
+ struct active_request_slot *newslot;
+
+#ifdef USE_CURL_MULTI
+ int num_transfers;
+
+ /* Wait for a slot to open up if the queue is full */
+ while (active_requests >= max_requests) {
+ curl_multi_perform(curlm, &num_transfers);
+ if (num_transfers < active_requests) {
+ process_curl_messages();
+ }
+ }
+#endif
+
+ while (slot != NULL && slot->in_use) {
+ slot = slot->next;
+ }
+ if (slot == NULL) {
+ newslot = xmalloc(sizeof(*newslot));
+ newslot->curl = NULL;
+ newslot->in_use = 0;
+ newslot->next = NULL;
+
+ slot = active_queue_head;
+ if (slot == NULL) {
+ active_queue_head = newslot;
+ } else {
+ while (slot->next != NULL) {
+ slot = slot->next;
+ }
+ slot->next = newslot;
+ }
+ slot = newslot;
+ }
+
+ if (slot->curl == NULL) {
+#ifdef NO_CURL_EASY_DUPHANDLE
+ slot->curl = get_curl_handle();
+#else
+ slot->curl = curl_easy_duphandle(curl_default);
+#endif
+ }
+
+ active_requests++;
+ slot->in_use = 1;
+ slot->done = 0;
+ slot->local = NULL;
+ slot->callback_data = NULL;
+ slot->callback_func = NULL;
+ curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
+ curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
+ curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
+
+ return slot;
+}
+
+static int start_active_slot(struct active_request_slot *slot)
+{
+#ifdef USE_CURL_MULTI
+ CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
+
+ if (curlm_result != CURLM_OK &&
+ curlm_result != CURLM_CALL_MULTI_PERFORM) {
+ active_requests--;
+ slot->in_use = 0;
+ return 0;
+ }
+#endif
+ return 1;
+}
+
+static void run_active_slot(struct active_request_slot *slot)
+{
+#ifdef USE_CURL_MULTI
+ int num_transfers;
+ long last_pos = 0;
+ long current_pos;
+ fd_set readfds;
+ fd_set writefds;
+ fd_set excfds;
+ int max_fd;
+ struct timeval select_timeout;
+ CURLMcode curlm_result;
+
+ while (!slot->done) {
+ data_received = 0;
+ do {
+ curlm_result = curl_multi_perform(curlm,
+ &num_transfers);
+ } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
+ if (num_transfers < active_requests) {
+ process_curl_messages();
+ process_request_queue();
+ }
+
+ if (!data_received && slot->local != NULL) {
+ current_pos = ftell(slot->local);
+ if (current_pos > last_pos)
+ data_received++;
+ last_pos = current_pos;
+ }
+
+ if (!slot->done && !data_received) {
+ max_fd = 0;
+ FD_ZERO(&readfds);
+ FD_ZERO(&writefds);
+ FD_ZERO(&excfds);
+ select_timeout.tv_sec = 0;
+ select_timeout.tv_usec = 50000;
+ select(max_fd, &readfds, &writefds,
+ &excfds, &select_timeout);
+ }
+ }
+#else
+ slot->curl_result = curl_easy_perform(slot->curl);
+ active_requests--;
+#endif
+}
+
+static void start_request(struct transfer_request *request)
+{
+ char *hex = sha1_to_hex(request->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", request->filename);
+ unlink(prevfile);
+ rename(request->tmpfile, prevfile);
+ unlink(request->tmpfile);
+
+ if (request->local != -1)
+ error("fd leakage in start: %d", request->local);
+ request->local = open(request->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 (request->local < 0 && errno == ENOENT) {
+ char *dir = strrchr(request->tmpfile, '/');
+ if (dir) {
+ *dir = 0;
+ mkdir(request->tmpfile, 0777);
+ *dir = '/';
+ }
+ request->local = open(request->tmpfile,
+ O_WRONLY | O_CREAT | O_EXCL, 0666);
+ }
+
+ if (request->local < 0) {
+ request->state = ABORTED;
+ error("Couldn't create temporary file %s for %s: %s\n",
+ request->tmpfile, request->filename, strerror(errno));
+ return;
+ }
+
+ memset(&request->stream, 0, sizeof(request->stream));
+
+ inflateInit(&request->stream);
+
+ SHA1_Init(&request->c);
+
+ url = xmalloc(strlen(request->repo->base) + 50);
+ request->url = xmalloc(strlen(request->repo->base) + 50);
+ strcpy(url, request->repo->base);
+ posn = url + strlen(request->repo->base);
+ strcpy(posn, "objects/");
+ posn += 8;
+ memcpy(posn, hex, 2);
+ posn += 2;
+ *(posn++) = '/';
+ strcpy(posn, hex + 2);
+ strcpy(request->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,
+ request) == 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(&request->stream, 0, sizeof(request->stream));
+ inflateInit(&request->stream);
+ SHA1_Init(&request->c);
+ if (prev_posn>0) {
+ prev_posn = 0;
+ lseek(request->local, SEEK_SET, 0);
+ ftruncate(request->local, 0);
+ }
+ }
+
+ slot = get_active_slot();
+ curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
+ curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
+ curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->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 */
+ if (!start_active_slot(slot)) {
+ request->state = ABORTED;
+ close(request->local); request->local = -1;
+ free(request->url);
+ return;
+ }
+
+ request->slot = slot;
+ request->state = ACTIVE;
+}
+
+static void finish_request(struct transfer_request *request)
+{
+ struct stat st;
+
+ fchmod(request->local, 0444);
+ close(request->local); request->local = -1;
+
+ if (request->http_code == 416) {
+ fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
+ } else if (request->curl_result != CURLE_OK) {
+ if (stat(request->tmpfile, &st) == 0)
+ if (st.st_size == 0)
+ unlink(request->tmpfile);
+ return;
+ }
+
+ inflateEnd(&request->stream);
+ SHA1_Final(request->real_sha1, &request->c);
+ if (request->zret != Z_STREAM_END) {
+ unlink(request->tmpfile);
+ return;
+ }
+ if (memcmp(request->sha1, request->real_sha1, 20)) {
+ unlink(request->tmpfile);
+ return;
+ }
+ request->rename =
+ move_temp_to_file(request->tmpfile, request->filename);
+
+ if (request->rename == 0)
+ pull_say("got %s\n", sha1_to_hex(request->sha1));
+}
+
+static void release_request(struct transfer_request *request)
+{
+ struct transfer_request *entry = request_queue_head;
+
+ if (request->local != -1)
+ error("fd leakage in release: %d", request->local);
+ if (request == request_queue_head) {
+ request_queue_head = request->next;
+ } else {
+ while (entry->next != NULL && entry->next != request)
+ entry = entry->next;
+ if (entry->next == request)
+ entry->next = entry->next->next;
+ }
+
+ free(request->url);
+ free(request);
+}
+
+#ifdef USE_CURL_MULTI
+static void process_curl_messages(void)
+{
+ int num_messages;
+ struct active_request_slot *slot;
+ struct transfer_request *request = NULL;
+ CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
+
+ while (curl_message != NULL) {
+ if (curl_message->msg == CURLMSG_DONE) {
+ int curl_result = curl_message->data.result;
+ slot = active_queue_head;
+ while (slot != NULL &&
+ slot->curl != curl_message->easy_handle)
+ slot = slot->next;
+ if (slot != NULL) {
+ curl_multi_remove_handle(curlm, slot->curl);
+ active_requests--;
+ slot->done = 1;
+ slot->in_use = 0;
+ slot->curl_result = curl_result;
+ curl_easy_getinfo(slot->curl,
+ CURLINFO_HTTP_CODE,
+ &slot->http_code);
+ request = request_queue_head;
+ while (request != NULL &&
+ request->slot != slot)
+ request = request->next;
+ } else {
+ fprintf(stderr, "Received DONE message for unknown request!\n");
+ }
+
+ /* Process slot callback if appropriate */
+ if (slot->callback_func != NULL) {
+ slot->callback_func(slot->callback_data);
+ }
+
+ if (request != NULL) {
+ request->curl_result = curl_result;
+ request->http_code = slot->http_code;
+ request->slot = NULL;
+ request->state = COMPLETE;
+
+ /* Use alternates if necessary */
+ if (request->http_code == 404) {
+ fetch_alternates(alt->base);
+ if (request->repo->next != NULL) {
+ request->repo =
+ request->repo->next;
+ close(request->local);
+ request->local = -1;
+ start_request(request);
+ } else {
+ finish_request(request);
+ }
+ } else {
+ finish_request(request);
+ }
+ }
+ } else {
+ fprintf(stderr, "Unknown CURL message received: %d\n",
+ (int)curl_message->msg);
+ }
+ curl_message = curl_multi_info_read(curlm, &num_messages);
+ }
+}
+
+static void process_request_queue(void)
{
+ struct transfer_request *request = request_queue_head;
+ struct active_request_slot *slot = active_queue_head;
+ int num_transfers;
+
+ while (active_requests < max_requests && request != NULL) {
+ if (request->state == WAITING) {
+ if (has_sha1_file(request->sha1))
+ release_request(request);
+ else
+ start_request(request);
+ curl_multi_perform(curlm, &num_transfers);
+ }
+ request = request->next;
+ }
+
+ while (slot != NULL) {
+ if (!slot->in_use && slot->curl != NULL) {
+ curl_easy_cleanup(slot->curl);
+ slot->curl = NULL;
+ }
+ slot = slot->next;
+ }
}
+#endif
-static int got_alternates = 0;
+void prefetch(unsigned char *sha1)
+{
+ struct transfer_request *newreq;
+ struct transfer_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 (request_queue_head == NULL) {
+ request_queue_head = newreq;
+ } else {
+ tail = request_queue_head;
+ while (tail->next != NULL) {
+ tail = tail->next;
+ }
+ tail->next = newreq;
+ }
+#ifdef USE_CURL_MULTI
+ process_request_queue();
+ process_curl_messages();
+#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(repo->base) + 64);
- sprintf(url, "%s/objects/pack/pack-%s.idx",
- repo->base, sha1_to_hex(sha1));
+ 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);
- curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
-
- 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(struct alt_base *repo, unsigned char *sha1)
return 0;
}
-static int fetch_alternates(char *base)
+static void process_alternates(void *callback_data)
{
- int ret = 0;
- struct buffer buffer;
- char *url;
+ struct alt_request *alt_req = (struct alt_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 (got_alternates)
- return 0;
- data = xmalloc(4096);
- buffer.size = 4096;
- buffer.posn = 0;
- buffer.buffer = data;
- if (get_verbosely)
- fprintf(stderr, "Getting alternates list\n");
-
- url = xmalloc(strlen(base) + 31);
- sprintf(url, "%s/objects/info/http-alternates", base);
-
- curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
- curl_easy_setopt(curl, CURLOPT_URL, url);
-
- if (curl_easy_perform(curl) || !buffer.posn) {
- sprintf(url, "%s/objects/info/alternates", base);
-
- curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
- curl_easy_setopt(curl, CURLOPT_URL, url);
-
- if (curl_easy_perform(curl)) {
- return 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;
+ slot->done = 0;
+ if (start_active_slot(slot)) {
+ return;
+ } else {
+ got_alternates = -1;
+ slot->done = 1;
+ return;
+ }
+ }
+ } else if (slot->curl_result != CURLE_OK) {
+ if (slot->http_code != 404) {
+ got_alternates = -1;
+ return;
}
}
- while (i < buffer.posn) {
+ fwrite_buffer_dynamic(&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 < buffer.posn && data[posn] != '\n')
+ 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] == '/') {
- int serverlen = strchr(base + 8, '/') - base;
- // skip 'objects' at end
- char *target =
- xmalloc(serverlen + posn - i - 6);
- struct alt_base *newalt;
+ 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);
fprintf(stderr,
"Also look at %s\n", target);
newalt = xmalloc(sizeof(*newalt));
- newalt->next = alt;
+ newalt->next = NULL;
newalt->base = target;
newalt->got_indices = 0;
newalt->packs = NULL;
- alt = newalt;
- ret++;
+ 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 alt_request alt_req;
+ int num_transfers;
+
+ /* If another request has already started fetching alternates,
+ wait for them to arrive and return to processing this request's
+ curl message */
+ while (got_alternates == 0) {
+ curl_multi_perform(curlm, &num_transfers);
+ process_curl_messages();
+ process_request_queue();
+ }
+
+ /* 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);
- return ret;
+ 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;
+ slot->callback_data = &alt_req;
+
+ curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
+ curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
+ fwrite_buffer_dynamic);
+ 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)
char *data;
int i = 0;
+ struct active_request_slot *slot;
+
if (repo->got_indices)
return 0;
buffer.buffer = data;
if (get_verbosely)
- fprintf(stderr, "Getting pack list\n");
+ fprintf(stderr, "Getting pack list for %s\n", repo->base);
url = xmalloc(strlen(repo->base) + 21);
sprintf(url, "%s/objects/info/packs", repo->base);
- curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
- curl_easy_setopt(curl, CURLOPT_URL, url);
- curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
-
- if (curl_easy_perform(curl)) {
- return error("Unable to get pack index %s", url);
+ slot = get_active_slot();
+ curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
+ curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
+ fwrite_buffer_dynamic);
+ 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) {
+ free(buffer.buffer);
+ return error("%s", curl_errorstr);
+ }
+ } else {
+ free(buffer.buffer);
+ return error("Unable to start request");
}
+ data = buffer.buffer;
while (i < buffer.posn) {
switch (data[i]) {
case 'P':
i++;
}
+ free(buffer.buffer);
repo->got_indices = 1;
return 0;
}
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(repo))
return -1;
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);
- curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
-
- 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);
+ 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_object(struct alt_base *repo, 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;
+ struct transfer_request *request = request_queue_head;
- local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+ while (request != NULL && memcmp(request->sha1, sha1, 20))
+ request = request->next;
+ if (request == 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));
-
- inflateInit(&stream);
-
- SHA1_Init(&c);
+ if (has_sha1_file(request->sha1)) {
+ release_request(request);
+ return 0;
+ }
- curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
- curl_easy_setopt(curl, CURLOPT_FILE, NULL);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
- curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
+#ifdef USE_CURL_MULTI
+ while (request->state == WAITING) {
+ int num_transfers;
+ curl_multi_perform(curlm, &num_transfers);
+ if (num_transfers < active_requests) {
+ process_curl_messages();
+ process_request_queue();
+ }
+ }
+#else
+ start_request(request);
+#endif
- url = xmalloc(strlen(repo->base) + 50);
- strcpy(url, repo->base);
- posn = url + strlen(repo->base);
- strcpy(posn, "objects/");
- posn += 8;
- memcpy(posn, hex, 2);
- posn += 2;
- *(posn++) = '/';
- strcpy(posn, hex + 2);
+ while (request->state == ACTIVE) {
+ run_active_slot(request->slot);
+#ifndef USE_CURL_MULTI
+ request->curl_result = request->slot->curl_result;
+ request->http_code = request->slot->http_code;
+ request->slot = NULL;
+
+ /* Use alternates if necessary */
+ if (request->http_code == 404) {
+ fetch_alternates(alt->base);
+ if (request->repo->next != NULL) {
+ request->repo = request->repo->next;
+ close(request->local); request->local = -1;
+ start_request(request);
+ }
+ } else {
+ finish_request(request);
+ request->state = COMPLETE;
+ }
+#endif
+ }
+ if (request->local != -1) {
+ close(request->local); request->local = -1;
+ }
- curl_easy_setopt(curl, CURLOPT_URL, url);
+ if (request->state == ABORTED) {
+ release_request(request);
+ return error("Request for %s aborted", hex);
+ }
- if (curl_easy_perform(curl)) {
- unlink(filename);
- return -1;
+ if (request->curl_result != CURLE_OK && request->http_code != 416) {
+ if (request->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)",
+ request->errorstr, request->curl_result,
+ request->http_code, hex);
+ release_request(request);
+ return ret;
}
- 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);
+ if (request->zret != Z_STREAM_END) {
+ ret = error("File %s (%s) corrupt\n", hex, request->url);
+ release_request(request);
+ return ret;
}
- if (memcmp(sha1, real_sha1, 20)) {
- unlink(filename);
+
+ if (memcmp(request->sha1, request->real_sha1, 20)) {
+ release_request(request);
return error("File %s has bad hash\n", hex);
}
-
- pull_say("got %s\n", hex);
+
+ if (request->rename < 0) {
+ ret = error("unable to write sha1 filename %s: %s",
+ request->filename,
+ strerror(request->rename));
+ release_request(request);
+ return ret;
+ }
+
+ release_request(request);
return 0;
}
int fetch(unsigned char *sha1)
{
struct alt_base *altbase = alt;
+
+ if (!fetch_object(altbase, sha1))
+ return 0;
while (altbase) {
- if (!fetch_object(altbase, sha1))
- return 0;
if (!fetch_pack(altbase, sha1))
return 0;
- if (fetch_alternates(altbase->base) > 0) {
- altbase = alt;
- continue;
- }
+ fetch_alternates(alt->base);
altbase = altbase->next;
}
return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
- initial_base);
+ alt->base);
+}
+
+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;
+ }
+}
+
+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;
+ }
+ *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 = initial_base;
+ 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);
- curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
-
- 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;
+ struct active_request_slot *slot;
+ char *low_speed_limit;
+ char *low_speed_time;
+ char *wait_url;
+ int rc = 0;
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++;
}
curl_global_init(CURL_GLOBAL_ALL);
- curl = curl_easy_init();
+#ifdef USE_CURL_MULTI
+ {
+ char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
+ if (http_max_requests != NULL)
+ max_requests = atoi(http_max_requests);
+ }
+
+ curlm = curl_multi_init();
+ if (curlm == NULL) {
+ fprintf(stderr, "Error creating curl multi handle.\n");
+ return 1;
+ }
+#endif
+
+ if (getenv("GIT_SSL_NO_VERIFY"))
+ curl_ssl_verify = 0;
+
+ ssl_cert = getenv("GIT_SSL_CERT");
+#if LIBCURL_VERSION_NUM >= 0x070902
+ ssl_key = getenv("GIT_SSL_KEY");
+#endif
+#if LIBCURL_VERSION_NUM >= 0x070908
+ ssl_capath = getenv("GIT_SSL_CAPATH");
+#endif
+ ssl_cainfo = getenv("GIT_SSL_CAINFO");
+
+ low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
+ if (low_speed_limit != NULL)
+ curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
+ low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
+ if (low_speed_time != NULL)
+ curl_low_speed_time = strtol(low_speed_time, NULL, 10);
+
+ git_config(http_options);
+
+ if (curl_ssl_verify == -1)
+ curl_ssl_verify = 1;
+
+#ifdef USE_CURL_MULTI
+ if (max_requests < 1)
+ max_requests = DEFAULT_MAX_REQUESTS;
+#endif
+
+ pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
+ no_range_header = curl_slist_append(no_range_header, "Range:");
- curl_ssl_verify = getenv("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);
+#ifndef NO_CURL_EASY_DUPHANDLE
+ curl_default = get_curl_handle();
#endif
alt = xmalloc(sizeof(*alt));
alt->got_indices = 0;
alt->packs = NULL;
alt->next = NULL;
- initial_base = url;
if (pull(commit_id))
- return 1;
+ rc = 1;
+ curl_slist_free_all(pragma_header);
curl_slist_free_all(no_pragma_header);
+ curl_slist_free_all(no_range_header);
+#ifndef NO_CURL_EASY_DUPHANDLE
+ curl_easy_cleanup(curl_default);
+#endif
+ slot = active_queue_head;
+ while (slot != NULL) {
+ if (slot->in_use) {
+ if (get_verbosely) {
+ curl_easy_getinfo(slot->curl,
+ CURLINFO_EFFECTIVE_URL,
+ &wait_url);
+ fprintf(stderr, "Waiting for %s\n", wait_url);
+ }
+ run_active_slot(slot);
+ }
+ if (slot->curl != NULL)
+ curl_easy_cleanup(slot->curl);
+ slot = slot->next;
+ }
+#ifdef USE_CURL_MULTI
+ curl_multi_cleanup(curlm);
+#endif
curl_global_cleanup();
- return 0;
+ return rc;
}