#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
-#if LIBCURL_VERSION_NUM < 0x070800
-#define curl_global_init(a) do { /* nothing */ } while(0)
-#endif
+#include "http.h"
#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30
-static int active_requests = 0;
-static int data_received;
+static int got_alternates = -1;
-#ifdef USE_CURL_MULTI
-static int max_requests = DEFAULT_MAX_REQUESTS;
-static CURLM *curlm;
-#endif
-static CURL *curl_default;
-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
{
static struct alt_base *alt = NULL;
-enum transfer_state {
+enum object_request_state {
WAITING,
ABORTED,
ACTIVE,
COMPLETE,
};
-struct transfer_request
+struct object_request
{
unsigned char sha1[20];
struct alt_base *repo;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int local;
- enum transfer_state state;
+ enum object_request_state state;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
long http_code;
int zret;
int rename;
struct active_request_slot *slot;
- struct transfer_request *next;
+ struct object_request *next;
};
-struct active_request_slot
-{
- CURL *curl;
- FILE *local;
- int in_use;
- int done;
- CURLcode curl_result;
- struct active_request_slot *next;
-};
-
-static struct transfer_request *request_queue_head = NULL;
-static struct active_request_slot *active_queue_head = NULL;
-
-static int curl_ssl_verify;
-static char *ssl_cert;
-static char *ssl_key;
-static char *ssl_capath;
-static char *ssl_cainfo;
-
-struct buffer
-{
- size_t posn;
- size_t size;
- void *buffer;
+struct alternates_request {
+ char *base;
+ char *url;
+ struct buffer *buffer;
+ struct active_request_slot *slot;
+ int http_specific;
};
-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;
- data_received++;
- return size;
-}
+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 transfer_request *request = (struct transfer_request *)data;
+ struct object_request *obj_req = (struct object_request *)data;
do {
- ssize_t retval = write(request->local,
+ ssize_t retval = write(obj_req->local,
ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);
- request->stream.avail_in = size;
- request->stream.next_in = ptr;
+ obj_req->stream.avail_in = size;
+ obj_req->stream.next_in = ptr;
do {
- 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);
+ 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;
}
-int relink_or_rename(char *old, char *new) {
- int ret;
-
- ret = link(old, new);
- if (ret < 0) {
- /* Same Coda hack as in write_sha1_file(sha1_file.c) */
- ret = errno;
- if (ret == EXDEV && !rename(old, new))
- return 0;
- }
- unlink(old);
- if (ret) {
- if (ret != EEXIST)
- return ret;
- }
-
- return 0;
-}
-
-#ifdef USE_CURL_MULTI
-void process_curl_messages();
-void process_request_queue();
-#endif
-
-struct active_request_slot *get_active_slot()
-{
- 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 = curl_easy_duphandle(curl_default);
- 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;
- }
-
- active_requests++;
- slot->in_use = 1;
- slot->done = 0;
- slot->local = 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;
-}
-
-int start_active_slot(struct active_request_slot *slot)
-{
-#ifdef USE_CURL_MULTI
- CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
+static void fetch_alternates(char *base);
- if (curlm_result != CURLM_OK &&
- curlm_result != CURLM_CALL_MULTI_PERFORM) {
- active_requests--;
- slot->in_use = 0;
- return 0;
- }
-#endif
- return 1;
-}
+static void process_object_response(void *callback_data);
-void run_active_slot(struct active_request_slot *slot)
+static void start_object_request(struct object_request *obj_req)
{
-#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
-}
-
-void start_request(struct transfer_request *request)
-{
- char *hex = sha1_to_hex(request->sha1);
+ char *hex = sha1_to_hex(obj_req->sha1);
char prevfile[PATH_MAX];
char *url;
char *posn;
struct curl_slist *range_header = NULL;
struct active_request_slot *slot;
- snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
+ snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename);
unlink(prevfile);
- rename(request->tmpfile, prevfile);
- unlink(request->tmpfile);
+ rename(obj_req->tmpfile, prevfile);
+ unlink(obj_req->tmpfile);
- request->local = open(request->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);
- if (request->local < 0) {
- request->state = ABORTED;
+ /* 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",
- request->tmpfile, request->filename, strerror(errno));
+ obj_req->tmpfile, obj_req->filename, strerror(errno));
return;
}
- memset(&request->stream, 0, sizeof(request->stream));
+ memset(&obj_req->stream, 0, sizeof(obj_req->stream));
- inflateInit(&request->stream);
+ inflateInit(&obj_req->stream);
- SHA1_Init(&request->c);
+ SHA1_Init(&obj_req->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);
+ 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(request->url, url);
+ strcpy(obj_req->url, url);
/* If a previous temp file is present, process what was already
fetched. */
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
- request) == prev_read) {
+ obj_req) == prev_read) {
prev_posn += prev_read;
} else {
prev_read = -1;
/* 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);
+ 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(request->local, SEEK_SET, 0);
- ftruncate(request->local, 0);
+ lseek(obj_req->local, SEEK_SET, 0);
+ ftruncate(obj_req->local, 0);
}
}
slot = get_active_slot();
- curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
+ 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, request->errorstr);
+ 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);
}
/* Try to get the request started, abort the request on error */
+ obj_req->state = ACTIVE;
if (!start_active_slot(slot)) {
- request->state = ABORTED;
- close(request->local);
- free(request->url);
+ obj_req->state = ABORTED;
+ obj_req->slot = NULL;
+ close(obj_req->local); obj_req->local = -1;
+ free(obj_req->url);
return;
}
-
- request->slot = slot;
- request->state = ACTIVE;
}
-void finish_request(struct transfer_request *request)
+static void finish_object_request(struct object_request *obj_req)
{
- fchmod(request->local, 0444);
- close(request->local);
+ struct stat st;
- if (request->http_code == 416) {
+ 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 (request->curl_result != CURLE_OK) {
+ } 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(&request->stream);
- SHA1_Final(request->real_sha1, &request->c);
- if (request->zret != Z_STREAM_END) {
- unlink(request->tmpfile);
+ 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(request->sha1, request->real_sha1, 20)) {
- unlink(request->tmpfile);
+ if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
+ unlink(obj_req->tmpfile);
return;
}
- request->rename =
- relink_or_rename(request->tmpfile, request->filename);
+ obj_req->rename =
+ move_temp_to_file(obj_req->tmpfile, obj_req->filename);
- if (request->rename == 0)
- pull_say("got %s\n", sha1_to_hex(request->sha1));
+ if (obj_req->rename == 0)
+ pull_say("got %s\n", sha1_to_hex(obj_req->sha1));
}
-void release_request(struct transfer_request *request)
+static void process_object_response(void *callback_data)
{
- struct transfer_request *entry = request_queue_head;
+ 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 ||
+ obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+ 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 (request == request_queue_head) {
- request_queue_head = request->next;
+ 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 != request)
+ while (entry->next != NULL && entry->next != obj_req)
entry = entry->next;
- if (entry->next == request)
+ if (entry->next == obj_req)
entry->next = entry->next->next;
}
- free(request->url);
- free(request);
+ free(obj_req->url);
+ free(obj_req);
}
#ifdef USE_CURL_MULTI
-void process_curl_messages()
+void fill_active_slots(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) {
- 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_message->data.result;
- request = request_queue_head;
- while (request != NULL &&
- request->slot != slot)
- request = request->next;
- } else {
- fprintf(stderr, "Received DONE message for unknown request!\n");
- }
- if (request != NULL) {
- request->curl_result =
- curl_message->data.result;
- curl_easy_getinfo(slot->curl,
- CURLINFO_HTTP_CODE,
- &request->http_code);
- request->slot = NULL;
-
- /* Use alternates if necessary */
- if (request->http_code == 404 &&
- request->repo->next != NULL) {
- request->repo = request->repo->next;
- start_request(request);
- } else {
- finish_request(request);
- request->state = COMPLETE;
- }
- }
- } else {
- fprintf(stderr, "Unknown CURL message received: %d\n",
- (int)curl_message->msg);
- }
- curl_message = curl_multi_info_read(curlm, &num_messages);
- }
-}
-
-void process_request_queue()
-{
- struct transfer_request *request = request_queue_head;
+ struct object_request *obj_req = object_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);
+ while (active_requests < max_requests && obj_req != NULL) {
+ if (obj_req->state == WAITING) {
+ if (has_sha1_file(obj_req->sha1))
+ obj_req->state = COMPLETE;
else
- start_request(request);
+ start_object_request(obj_req);
curl_multi_perform(curlm, &num_transfers);
}
- request = request->next;
+ 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 transfer_request *newreq;
- struct transfer_request *tail;
+ struct object_request *newreq;
+ struct object_request *tail;
char *filename = sha1_file_name(sha1);
newreq = xmalloc(sizeof(*newreq));
"%s.temp", filename);
newreq->next = NULL;
- if (request_queue_head == NULL) {
- request_queue_head = newreq;
+ if (object_queue_head == NULL) {
+ object_queue_head = newreq;
} else {
- tail = request_queue_head;
+ tail = object_queue_head;
while (tail->next != NULL) {
tail = tail->next;
}
tail->next = newreq;
}
+
#ifdef USE_CURL_MULTI
- process_request_queue();
- process_curl_messages();
+ fill_active_slots();
+ step_active_slots();
#endif
}
-static int got_alternates = 0;
-
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];
- int ret;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
FILE *indexfile;
struct active_request_slot *slot;
+ struct slot_results results;
if (has_pack_index(sha1))
return 0;
if (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");
filename);
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);
if (start_active_slot(slot)) {
run_active_slot(slot);
- if (slot->curl_result != CURLE_OK) {
+ 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);
- ret = relink_or_rename(tmpfile, filename);
- if (ret)
- return error("unable to write index filename %s: %s",
- filename, strerror(ret));
-
- 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_response(void *callback_data)
{
- int ret = 0;
- struct buffer buffer;
- char *url;
+ 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;
- int http_specific = 1;
- struct alt_base *tail = alt;
- struct active_request_slot *slot;
- if (got_alternates)
- return 0;
- data = xmalloc(4096);
- buffer.size = 4095;
- 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);
-
- 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);
- if (start_active_slot(slot)) {
- run_active_slot(slot);
- if (slot->curl_result != CURLE_OK || !buffer.posn) {
- http_specific = 0;
-
- sprintf(url, "%s/objects/info/alternates", 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);
- if (start_active_slot(slot)) {
- run_active_slot(slot);
- if (slot->curl_result != CURLE_OK) {
- 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;
+ if (!start_active_slot(slot)) {
+ got_alternates = -1;
+ slot->in_use = 0;
}
+ return;
+ }
+ } else if (slot->curl_result != CURLE_OK) {
+ if (slot->http_code != 404 &&
+ slot->curl_result != CURLE_FILE_COULDNT_READ_FILE) {
+ got_alternates = -1;
+ return;
}
- } else {
- return 0;
}
- data[buffer.posn] = '\0';
+ fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
+ alt_req->buffer->posn--;
+ data = alt_req->buffer->buffer;
- while (i < buffer.posn) {
+ 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;
} else if (!memcmp(data + i, "../", 3)) {
i += 3;
serverlen = strlen(base);
- while (i + 2 < posn &&
+ while (i + 2 < posn &&
!memcmp(data + i, "../", 3)) {
do {
serverlen--;
i += 3;
}
// If the server got removed, give up.
- okay = strchr(base, ':') - base + 3 <
+ okay = strchr(base, ':') - base + 3 <
serverlen;
- } else if (http_specific) {
+ } else if (alt_req->http_specific) {
char *colon = strchr(data + i, ':');
char *slash = strchr(data + i, '/');
if (colon && slash && colon < data + posn &&
posn - i - 7);
target[serverlen + posn - i - 7] = '\0';
if (get_verbosely)
- fprintf(stderr,
+ fprintf(stderr,
"Also look at %s\n", target);
newalt = xmalloc(sizeof(*newalt));
newalt->next = NULL;
while (tail->next != NULL)
tail = tail->next;
tail->next = newalt;
- ret++;
}
}
i = posn + 1;
}
+
got_alternates = 1;
-
- return ret;
+}
+
+static void fetch_alternates(char *base)
+{
+ struct buffer buffer;
+ char *url;
+ char *data;
+ struct active_request_slot *slot;
+ 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)
int i = 0;
struct active_request_slot *slot;
+ struct slot_results results;
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);
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 (slot->curl_result != CURLE_OK)
- return error("%s", curl_errorstr);
+ if (results.curl_result != CURLE_OK) {
+ if (results.http_code == 404 ||
+ results.curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+ 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 &&
+ if (i + 52 <= buffer.posn &&
!strncmp(data + i, " pack-", 6) &&
!strncmp(data + i + 46, ".pack\n", 6)) {
get_sha1_hex(data + i + 6, sha1);
break;
}
default:
- while (data[i] != '\n')
+ while (i < buffer.posn && data[i] != '\n')
i++;
}
i++;
}
+ free(buffer.buffer);
repo->got_indices = 1;
return 0;
}
struct curl_slist *range_header = NULL;
struct active_request_slot *slot;
+ struct slot_results results;
if (fetch_indices(repo))
return -1;
filename);
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);
if (start_active_slot(slot)) {
run_active_slot(slot);
- if (slot->curl_result != CURLE_OK) {
+ 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");
}
fclose(packfile);
- ret = relink_or_rename(tmpfile, filename);
+ ret = move_temp_to_file(tmpfile, filename);
if (ret)
- return error("unable to write pack filename %s: %s",
- filename, strerror(ret));
+ return ret;
lst = &repo->packs;
while (*lst != 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 alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
- int ret;
- struct transfer_request *request = request_queue_head;
+ int ret = 0;
+ struct object_request *obj_req = object_queue_head;
- while (request != NULL && memcmp(request->sha1, sha1, 20))
- request = request->next;
- if (request == NULL)
+ 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 (has_sha1_file(request->sha1)) {
- release_request(request);
+ if (has_sha1_file(obj_req->sha1)) {
+ abort_object_request(obj_req);
return 0;
}
#ifdef USE_CURL_MULTI
- int num_transfers;
- while (request->state == WAITING) {
- curl_multi_perform(curlm, &num_transfers);
- if (num_transfers < active_requests) {
- process_curl_messages();
- process_request_queue();
- }
+ while (obj_req->state == WAITING) {
+ step_active_slots();
}
#else
- start_request(request);
-#endif
-
- while (request->state == ACTIVE) {
- run_active_slot(request->slot);
-#ifndef USE_CURL_MULTI
- request->curl_result = request->slot->curl_result;
- curl_easy_getinfo(request->slot->curl,
- CURLINFO_HTTP_CODE,
- &request->http_code);
- request->slot = NULL;
-
- /* Use alternates if necessary */
- if (request->http_code == 404 &&
- request->repo->next != NULL) {
- request->repo = request->repo->next;
- start_request(request);
- } else {
- finish_request(request);
- request->state = COMPLETE;
- }
+ start_object_request(obj_req);
#endif
- }
-
- if (request->state == ABORTED) {
- release_request(request);
- return error("Request for %s aborted", hex);
- }
-
- if (request->curl_result != CURLE_OK && request->http_code != 416) {
- ret = error("%s", request->errorstr);
- release_request(request);
- return ret;
- }
-
- if (request->zret != Z_STREAM_END) {
- ret = error("File %s (%s) corrupt\n", hex, request->url);
- release_request(request);
- return ret;
- }
-
- if (memcmp(request->sha1, request->real_sha1, 20)) {
- release_request(request);
- return error("File %s has bad hash\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;
+ 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 (obj_req->http_code == 404 ||
+ obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE)
+ 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",
+ obj_req->filename);
+ }
+
+ release_object_request(obj_req);
+ return ret;
}
int fetch(unsigned char *sha1)
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),
+ return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
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 = alt->base;
struct active_request_slot *slot;
+ struct slot_results results;
buffer.size = 41;
buffer.posn = 0;
buffer.buffer = hex;
hex[41] = '\0';
-
- url = xmalloc(strlen(base) + 6 + strlen(ref));
- strcpy(url, base);
- posn = url + strlen(base);
- strcpy(posn, "refs/");
- posn += 5;
- strcpy(posn, ref);
+ 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 (slot->curl_result != CURLE_OK)
+ if (results.curl_result != CURLE_OK)
return error("Couldn't get %s for %s\n%s",
url, ref, curl_errorstr);
} else {
char *commit_id;
char *url;
int arg = 1;
- struct active_request_slot *slot;
+ int rc = 0;
+
+ setup_git_directory();
while (arg < argc && argv[arg][0] == '-') {
if (argv[arg][1] == 't') {
commit_id = argv[arg];
url = argv[arg + 1];
- curl_global_init(CURL_GLOBAL_ALL);
+ http_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);
- if (max_requests < 1)
- max_requests = DEFAULT_MAX_REQUESTS;
-
- curlm = curl_multi_init();
- if (curlm == NULL) {
- fprintf(stderr, "Error creating curl multi handle.\n");
- return 1;
- }
-#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_default = curl_easy_init();
-
- curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
- curl_easy_setopt(curl_default, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
-#if LIBCURL_VERSION_NUM >= 0x070907
- curl_easy_setopt(curl_default, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
-#endif
-
- if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
- curl_easy_setopt(curl_default, CURLOPT_SSLCERT, ssl_cert);
- }
-#if LIBCURL_VERSION_NUM >= 0x070902
- if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
- curl_easy_setopt(curl_default, CURLOPT_SSLKEY, ssl_key);
- }
-#endif
-#if LIBCURL_VERSION_NUM >= 0x070908
- if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
- curl_easy_setopt(curl_default, CURLOPT_CAPATH, ssl_capath);
- }
-#endif
- if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
- curl_easy_setopt(curl_default, CURLOPT_CAINFO, ssl_cainfo);
- }
- curl_easy_setopt(curl_default, CURLOPT_FAILONERROR, 1);
alt = xmalloc(sizeof(*alt));
alt->base = url;
alt->got_indices = 0;
alt->packs = NULL;
alt->next = NULL;
- fetch_alternates(alt->base);
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);
- curl_easy_cleanup(curl_default);
- slot = active_queue_head;
- while (slot != NULL) {
- curl_easy_cleanup(slot->curl);
- slot = slot->next;
- }
-#ifdef USE_CURL_MULTI
- curl_multi_cleanup(curlm);
-#endif
- curl_global_cleanup();
- return 0;
+
+ http_cleanup();
+
+ return rc;
}