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#include "cache.h"
#include "commit.h"
#include "walker.h"
#include "http.h"
struct alt_base {
char *base;
int got_indices;
struct packed_git *packs;
struct alt_base *next;
};
enum object_request_state {
WAITING,
ABORTED,
ACTIVE,
COMPLETE
};
struct object_request {
struct walker *walker;
unsigned char sha1[20];
struct alt_base *repo;
enum object_request_state state;
struct http_object_request *req;
struct object_request *next;
};
struct alternates_request {
struct walker *walker;
const char *base;
char *url;
struct strbuf *buffer;
struct active_request_slot *slot;
int http_specific;
};
struct walker_data {
const char *url;
int got_alternates;
struct alt_base *alt;
};
static struct object_request *object_queue_head;
static void fetch_alternates(struct walker *walker, const char *base);
static void process_object_response(void *callback_data);
static void start_object_request(struct walker *walker,
struct object_request *obj_req)
{
struct active_request_slot *slot;
struct http_object_request *req;
req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
if (req == NULL) {
obj_req->state = ABORTED;
return;
}
obj_req->req = req;
slot = req->slot;
slot->callback_func = process_object_response;
slot->callback_data = obj_req;
/* Try to get the request started, abort the request on error */
obj_req->state = ACTIVE;
if (!start_active_slot(slot)) {
obj_req->state = ABORTED;
release_http_object_request(req);
return;
}
}
static void finish_object_request(struct object_request *obj_req)
{
if (finish_http_object_request(obj_req->req))
return;
if (obj_req->req->rename == 0)
walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
}
static void process_object_response(void *callback_data)
{
struct object_request *obj_req =
(struct object_request *)callback_data;
struct walker *walker = obj_req->walker;
struct walker_data *data = walker->data;
struct alt_base *alt = data->alt;
process_http_object_request(obj_req->req);
obj_req->state = COMPLETE;
/* Use alternates if necessary */
if (missing_target(obj_req->req)) {
fetch_alternates(walker, alt->base);
if (obj_req->repo->next != NULL) {
obj_req->repo =
obj_req->repo->next;
release_http_object_request(obj_req->req);
start_object_request(walker, obj_req);
return;
}
}
finish_object_request(obj_req);
}
static void release_object_request(struct object_request *obj_req)
{
struct object_request *entry = object_queue_head;
if (obj_req->req !=NULL && obj_req->req->localfile != -1)
error("fd leakage in release: %d", obj_req->req->localfile);
if (obj_req == object_queue_head) {
object_queue_head = obj_req->next;
} else {
while (entry->next != NULL && entry->next != obj_req)
entry = entry->next;
if (entry->next == obj_req)
entry->next = entry->next->next;
}
free(obj_req);
}
#ifdef USE_CURL_MULTI
static int fill_active_slot(struct walker *walker)
{
struct object_request *obj_req;
for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
if (obj_req->state == WAITING) {
if (has_sha1_file(obj_req->sha1))
obj_req->state = COMPLETE;
else {
start_object_request(walker, obj_req);
return 1;
}
}
}
return 0;
}
#endif
static void prefetch(struct walker *walker, unsigned char *sha1)
{
struct object_request *newreq;
struct object_request *tail;
struct walker_data *data = walker->data;
newreq = xmalloc(sizeof(*newreq));
newreq->walker = walker;
hashcpy(newreq->sha1, sha1);
newreq->repo = data->alt;
newreq->state = WAITING;
newreq->req = NULL;
newreq->next = NULL;
http_is_verbose = walker->get_verbosely;
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 void process_alternates_response(void *callback_data)
{
struct alternates_request *alt_req =
(struct alternates_request *)callback_data;
struct walker *walker = alt_req->walker;
struct walker_data *cdata = walker->data;
struct active_request_slot *slot = alt_req->slot;
struct alt_base *tail = cdata->alt;
const char *base = alt_req->base;
const char null_byte = '\0';
char *data;
int i = 0;
if (alt_req->http_specific) {
if (slot->curl_result != CURLE_OK ||
!alt_req->buffer->len) {
/* Try reusing the slot to get non-http alternates */
alt_req->http_specific = 0;
sprintf(alt_req->url, "%s/objects/info/alternates",
base);
curl_easy_setopt(slot->curl, CURLOPT_URL,
alt_req->url);
active_requests++;
slot->in_use = 1;
if (slot->finished != NULL)
(*slot->finished) = 0;
if (!start_active_slot(slot)) {
cdata->got_alternates = -1;
slot->in_use = 0;
if (slot->finished != NULL)
(*slot->finished) = 1;
}
return;
}
} else if (slot->curl_result != CURLE_OK) {
if (!missing_target(slot)) {
cdata->got_alternates = -1;
return;
}
}
fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
alt_req->buffer->len--;
data = alt_req->buffer->buf;
while (i < alt_req->buffer->len) {
int posn = i;
while (posn < alt_req->buffer->len && data[posn] != '\n')
posn++;
if (data[posn] == '\n') {
int okay = 0;
int serverlen = 0;
struct alt_base *newalt;
char *target = NULL;
if (data[i] == '/') {
/*
* This counts
* http://git.host/pub/scm/linux.git/
* -----------here^
* so memcpy(dst, base, serverlen) will
* copy up to "...git.host".
*/
const char *colon_ss = strstr(base,"://");
if (colon_ss) {
serverlen = (strchr(colon_ss + 3, '/')
- base);
okay = 1;
}
} else if (!memcmp(data + i, "../", 3)) {
/*
* Relative URL; chop the corresponding
* number of subpath from base (and ../
* from data), and concatenate the result.
*
* The code first drops ../ from data, and
* then drops one ../ from data and one path
* from base. IOW, one extra ../ is dropped
* from data than path is dropped from base.
*
* This is not wrong. The alternate in
* http://git.host/pub/scm/linux.git/
* to borrow from
* http://git.host/pub/scm/linus.git/
* is ../../linus.git/objects/. You need
* two ../../ to borrow from your direct
* neighbour.
*/
i += 3;
serverlen = strlen(base);
while (i + 2 < posn &&
!memcmp(data + i, "../", 3)) {
do {
serverlen--;
} while (serverlen &&
base[serverlen - 1] != '/');
i += 3;
}
/* If the server got removed, give up. */
okay = strchr(base, ':') - base + 3 <
serverlen;
} else if (alt_req->http_specific) {
char *colon = strchr(data + i, ':');
char *slash = strchr(data + i, '/');
if (colon && slash && colon < data + posn &&
slash < data + posn && colon < slash) {
okay = 1;
}
}
/* skip "objects\n" at end */
if (okay) {
target = xmalloc(serverlen + posn - i - 6);
memcpy(target, base, serverlen);
memcpy(target + serverlen, data + i,
posn - i - 7);
target[serverlen + posn - i - 7] = 0;
if (walker->get_verbosely)
fprintf(stderr,
"Also look at %s\n", target);
newalt = xmalloc(sizeof(*newalt));
newalt->next = NULL;
newalt->base = target;
newalt->got_indices = 0;
newalt->packs = NULL;
while (tail->next != NULL)
tail = tail->next;
tail->next = newalt;
}
}
i = posn + 1;
}
cdata->got_alternates = 1;
}
static void fetch_alternates(struct walker *walker, const char *base)
{
struct strbuf buffer = STRBUF_INIT;
char *url;
struct active_request_slot *slot;
struct alternates_request alt_req;
struct walker_data *cdata = walker->data;
/*
* If another request has already started fetching alternates,
* wait for them to arrive and return to processing this request's
* curl message
*/
#ifdef USE_CURL_MULTI
while (cdata->got_alternates == 0) {
step_active_slots();
}
#endif
/* Nothing to do if they've already been fetched */
if (cdata->got_alternates == 1)
return;
/* Start the fetch */
cdata->got_alternates = 0;
if (walker->get_verbosely)
fprintf(stderr, "Getting alternates list for %s\n", base);
url = xmalloc(strlen(base) + 31);
sprintf(url, "%s/objects/info/http-alternates", base);
/*
* Use a callback to process the result, since another request
* may fail and need to have alternates loaded before continuing
*/
slot = get_active_slot();
slot->callback_func = process_alternates_response;
alt_req.walker = walker;
slot->callback_data = &alt_req;
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
alt_req.base = base;
alt_req.url = url;
alt_req.buffer = &buffer;
alt_req.http_specific = 1;
alt_req.slot = slot;
if (start_active_slot(slot))
run_active_slot(slot);
else
cdata->got_alternates = -1;
strbuf_release(&buffer);
free(url);
}
static int fetch_indices(struct walker *walker, struct alt_base *repo)
{
int ret;
if (repo->got_indices)
return 0;
if (walker->get_verbosely)
fprintf(stderr, "Getting pack list for %s\n", repo->base);
switch (http_get_info_packs(repo->base, &repo->packs)) {
case HTTP_OK:
case HTTP_MISSING_TARGET:
repo->got_indices = 1;
ret = 0;
break;
default:
repo->got_indices = 0;
ret = -1;
}
return ret;
}
static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
{
struct packed_git *target;
int ret;
struct slot_results results;
struct http_pack_request *preq;
if (fetch_indices(walker, repo))
return -1;
target = find_sha1_pack(sha1, repo->packs);
if (!target)
return -1;
if (walker->get_verbosely) {
fprintf(stderr, "Getting pack %s\n",
sha1_to_hex(target->sha1));
fprintf(stderr, " which contains %s\n",
sha1_to_hex(sha1));
}
preq = new_http_pack_request(target, repo->base);
if (preq == NULL)
goto abort;
preq->lst = &repo->packs;
preq->slot->results = &results;
if (start_active_slot(preq->slot)) {
run_active_slot(preq->slot);
if (results.curl_result != CURLE_OK) {
error("Unable to get pack file %s\n%s", preq->url,
curl_errorstr);
goto abort;
}
} else {
error("Unable to start request");
goto abort;
}
ret = finish_http_pack_request(preq);
release_http_pack_request(preq);
if (ret)
return ret;
return 0;
abort:
return -1;
}
static void abort_object_request(struct object_request *obj_req)
{
release_object_request(obj_req);
}
static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
int ret = 0;
struct object_request *obj_req = object_queue_head;
struct http_object_request *req;
while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
obj_req = obj_req->next;
if (obj_req == NULL)
return error("Couldn't find request for %s in the queue", hex);
if (has_sha1_file(obj_req->sha1)) {
if (obj_req->req != NULL)
abort_http_object_request(obj_req->req);
abort_object_request(obj_req);
return 0;
}
#ifdef USE_CURL_MULTI
while (obj_req->state == WAITING)
step_active_slots();
#else
start_object_request(walker, obj_req);
#endif
/*
* obj_req->req might change when fetching alternates in the callback
* process_object_response; therefore, the "shortcut" variable, req,
* is used only after we're done with slots.
*/
while (obj_req->state == ACTIVE)
run_active_slot(obj_req->req->slot);
req = obj_req->req;
if (req->localfile != -1) {
close(req->localfile);
req->localfile = -1;
}
if (obj_req->state == ABORTED) {
ret = error("Request for %s aborted", hex);
} else if (req->curl_result != CURLE_OK &&
req->http_code != 416) {
if (missing_target(req))
ret = -1; /* Be silent, it is probably in a pack. */
else
ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
req->errorstr, req->curl_result,
req->http_code, hex);
} else if (req->zret != Z_STREAM_END) {
walker->corrupt_object_found++;
ret = error("File %s (%s) corrupt", hex, req->url);
} else if (hashcmp(obj_req->sha1, req->real_sha1)) {
ret = error("File %s has bad hash", hex);
} else if (req->rename < 0) {
ret = error("unable to write sha1 filename %s",
sha1_file_name(req->sha1));
}
release_http_object_request(req);
release_object_request(obj_req);
return ret;
}
static int fetch(struct walker *walker, unsigned char *sha1)
{
struct walker_data *data = walker->data;
struct alt_base *altbase = data->alt;
if (!fetch_object(walker, altbase, sha1))
return 0;
while (altbase) {
if (!fetch_pack(walker, altbase, sha1))
return 0;
fetch_alternates(walker, data->alt->base);
altbase = altbase->next;
}
return error("Unable to find %s under %s", sha1_to_hex(sha1),
data->alt->base);
}
static int fetch_ref(struct walker *walker, struct ref *ref)
{
struct walker_data *data = walker->data;
return http_fetch_ref(data->alt->base, ref);
}
static void cleanup(struct walker *walker)
{
struct walker_data *data = walker->data;
struct alt_base *alt, *alt_next;
if (data) {
alt = data->alt;
while (alt) {
alt_next = alt->next;
free(alt->base);
free(alt);
alt = alt_next;
}
free(data);
walker->data = NULL;
}
}
struct walker *get_http_walker(const char *url)
{
char *s;
struct walker_data *data = xmalloc(sizeof(struct walker_data));
struct walker *walker = xmalloc(sizeof(struct walker));
data->alt = xmalloc(sizeof(*data->alt));
data->alt->base = xmalloc(strlen(url) + 1);
strcpy(data->alt->base, url);
for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
*s = 0;
data->alt->got_indices = 0;
data->alt->packs = NULL;
data->alt->next = NULL;
data->got_alternates = -1;
walker->corrupt_object_found = 0;
walker->fetch = fetch;
walker->fetch_ref = fetch_ref;
walker->prefetch = prefetch;
walker->cleanup = cleanup;
walker->data = data;
#ifdef USE_CURL_MULTI
add_fill_function(walker, (int (*)(void *)) fill_active_slot);
#endif
return walker;
}
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