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#include "cache.h"
#include "commit.h"
#include "pack.h"
#include "fetch.h"
#include "http.h"

#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30

static int commits_on_stdin;

static int got_alternates = -1;
static int corrupt_object_found;

static struct curl_slist *no_pragma_header;

struct alt_base
{
char *base;
int got_indices;
struct packed_git *packs;
struct alt_base *next;
};

static struct alt_base *alt;

enum object_request_state {
WAITING,
ABORTED,
ACTIVE,
COMPLETE,
};

struct object_request
{
unsigned char sha1[20];
struct alt_base *repo;
char *url;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int local;
enum object_request_state state;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
long http_code;
unsigned char real_sha1[20];
SHA_CTX c;
z_stream stream;
int zret;
int rename;
struct active_request_slot *slot;
struct object_request *next;
};

struct alternates_request {
const char *base;
char *url;
struct buffer *buffer;
struct active_request_slot *slot;
int http_specific;
};

static struct object_request *object_queue_head;

static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
void *data)
{
unsigned char expn[4096];
size_t size = eltsize * nmemb;
int posn = 0;
struct object_request *obj_req = (struct object_request *)data;
do {
ssize_t retval = xwrite(obj_req->local,
(char *) ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);

obj_req->stream.avail_in = size;
obj_req->stream.next_in = ptr;
do {
obj_req->stream.next_out = expn;
obj_req->stream.avail_out = sizeof(expn);
obj_req->zret = inflate(&obj_req->stream, Z_SYNC_FLUSH);
SHA1_Update(&obj_req->c, expn,
sizeof(expn) - obj_req->stream.avail_out);
} while (obj_req->stream.avail_in && obj_req->zret == Z_OK);
data_received++;
return size;
}

static int missing__target(int code, int result)
{
return /* file:// URL -- do we ever use one??? */
(result == CURLE_FILE_COULDNT_READ_FILE) ||
/* http:// and https:// URL */
(code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
/* ftp:// URL */
(code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
;
}

#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)

static void fetch_alternates(const 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",
obj_req->tmpfile, obj_req->filename, strerror(errno));
return;
}

memset(&obj_req->stream, 0, sizeof(obj_req->stream));

inflateInit(&obj_req->stream);

SHA1_Init(&obj_req->c);

url = xmalloc(strlen(obj_req->repo->base) + 51);
obj_req->url = xmalloc(strlen(obj_req->repo->base) + 51);
strcpy(url, obj_req->repo->base);
posn = url + strlen(obj_req->repo->base);
strcpy(posn, "/objects/");
posn += 9;
memcpy(posn, hex, 2);
posn += 2;
*(posn++) = '/';
strcpy(posn, hex + 2);
strcpy(obj_req->url, url);

/* If a previous temp file is present, process what was already
fetched. */
prevlocal = open(prevfile, O_RDONLY);
if (prevlocal != -1) {
do {
prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
if (prev_read>0) {
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
obj_req) == prev_read) {
prev_posn += prev_read;
} else {
prev_read = -1;
}
}
} while (prev_read > 0);
close(prevlocal);
}
unlink(prevfile);

/* Reset inflate/SHA1 if there was an error reading the previous temp
file; also rewind to the beginning of the local file. */
if (prev_read == -1) {
memset(&obj_req->stream, 0, sizeof(obj_req->stream));
inflateInit(&obj_req->stream);
SHA1_Init(&obj_req->c);
if (prev_posn>0) {
prev_posn = 0;
lseek(obj_req->local, 0, SEEK_SET);
ftruncate(obj_req->local, 0);
}
}

slot = get_active_slot();
slot->callback_func = process_object_response;
slot->callback_data = obj_req;
obj_req->slot = slot;

curl_easy_setopt(slot->curl, CURLOPT_FILE, obj_req);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, obj_req->errorstr);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, 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 void finish_object_request(struct object_request *obj_req)
{
struct stat st;

fchmod(obj_req->local, 0444);
close(obj_req->local); obj_req->local = -1;

if (obj_req->http_code == 416) {
fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
} else if (obj_req->curl_result != CURLE_OK) {
if (stat(obj_req->tmpfile, &st) == 0)
if (st.st_size == 0)
unlink(obj_req->tmpfile);
return;
}

inflateEnd(&obj_req->stream);
SHA1_Final(obj_req->real_sha1, &obj_req->c);
if (obj_req->zret != Z_STREAM_END) {
unlink(obj_req->tmpfile);
return;
}
if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
unlink(obj_req->tmpfile);
return;
}
obj_req->rename =
move_temp_to_file(obj_req->tmpfile, obj_req->filename);

if (obj_req->rename == 0)
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 (missing_target(obj_req)) {
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;
}

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))
obj_req->state = COMPLETE;
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));
hashcpy(newreq->sha1, sha1);
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->slot = NULL;
newreq->next = NULL;

if (object_queue_head == NULL) {
object_queue_head = newreq;
} else {
tail = object_queue_head;
while (tail->next != NULL) {
tail = tail->next;
}
tail->next = newreq;
}

#ifdef USE_CURL_MULTI
fill_active_slots();
step_active_slots();
#endif
}

static int fetch_index(struct 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;
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");
if (!indexfile)
return error("Unable to open local file %s for pack index",
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);
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 (results.curl_result != CURLE_OK) {
fclose(indexfile);
return error("Unable to get pack index %s\n%s", url,
curl_errorstr);
}
} else {
fclose(indexfile);
return error("Unable to start request");
}

fclose(indexfile);

return move_temp_to_file(tmpfile, filename);
}

static int setup_index(struct 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(repo, sha1))
return -1;

new_pack = parse_pack_index(sha1);
new_pack->next = repo->packs;
repo->packs = new_pack;
return 0;
}

static void process_alternates_response(void *callback_data)
{
struct alternates_request *alt_req =
(struct alternates_request *)callback_data;
struct active_request_slot *slot = alt_req->slot;
struct alt_base *tail = alt;
const char *base = alt_req->base;
static const char null_byte = '\0';
char *data;
int i = 0;

if (alt_req->http_specific) {
if (slot->curl_result != CURLE_OK ||
!alt_req->buffer->posn) {

/* Try reusing the slot to get non-http alternates */
alt_req->http_specific = 0;
sprintf(alt_req->url, "%s/objects/info/alternates",
base);
curl_easy_setopt(slot->curl, CURLOPT_URL,
alt_req->url);
active_requests++;
slot->in_use = 1;
if (slot->finished != NULL)
(*slot->finished) = 0;
if (!start_active_slot(slot)) {
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)) {
got_alternates = -1;
return;
}
}

fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
alt_req->buffer->posn--;
data = alt_req->buffer->buffer;

while (i < alt_req->buffer->posn) {
int posn = i;
while (posn < alt_req->buffer->posn && data[posn] != '\n')
posn++;
if (data[posn] == '\n') {
int okay = 0;
int serverlen = 0;
struct alt_base *newalt;
char *target = NULL;
if (data[i] == '/') {
/* This counts
* http://git.host/pub/scm/linux.git/
* -----------here^
* so memcpy(dst, base, serverlen) will
* copy up to "...git.host".
*/
const char *colon_ss = strstr(base,"://");
if (colon_ss) {
serverlen = (strchr(colon_ss + 3, '/')
- base);
okay = 1;
}
} else if (!memcmp(data + i, "../", 3)) {
/* Relative URL; chop the corresponding
* number of subpath from base (and ../
* from data), and concatenate the result.
*
* The code first drops ../ from data, and
* then drops one ../ from data and one path
* from base. IOW, one extra ../ is dropped
* from data than path is dropped from base.
*
* This is not wrong. The alternate in
* http://git.host/pub/scm/linux.git/
* to borrow from
* http://git.host/pub/scm/linus.git/
* is ../../linus.git/objects/. You need
* two ../../ to borrow from your direct
* neighbour.
*/
i += 3;
serverlen = strlen(base);
while (i + 2 < posn &&
!memcmp(data + i, "../", 3)) {
do {
serverlen--;
} while (serverlen &&
base[serverlen - 1] != '/');
i += 3;
}
/* If the server got removed, give up. */
okay = strchr(base, ':') - base + 3 <
serverlen;
} else if (alt_req->http_specific) {
char *colon = strchr(data + i, ':');
char *slash = strchr(data + i, '/');
if (colon && slash && colon < data + posn &&
slash < data + posn && colon < slash) {
okay = 1;
}
}
/* skip "objects\n" at end */
if (okay) {
target = xmalloc(serverlen + posn - i - 6);
memcpy(target, base, serverlen);
memcpy(target + serverlen, data + i,
posn - i - 7);
target[serverlen + posn - i - 7] = 0;
if (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(const 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)
{
unsigned char sha1[20];
char *url;
struct buffer buffer;
char *data;
int i = 0;

struct active_request_slot *slot;
struct slot_results results;

if (repo->got_indices)
return 0;

data = xmalloc(4096);
buffer.size = 4096;
buffer.posn = 0;
buffer.buffer = data;

if (get_verbosely)
fprintf(stderr, "Getting pack list for %s\n", repo->base);

url = xmalloc(strlen(repo->base) + 21);
sprintf(url, "%s/objects/info/packs", repo->base);

slot = get_active_slot();
slot->results = &results;
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK) {
if (missing_target(&results)) {
repo->got_indices = 1;
free(buffer.buffer);
return 0;
} else {
repo->got_indices = 0;
free(buffer.buffer);
return error("%s", curl_errorstr);
}
}
} else {
repo->got_indices = 0;
free(buffer.buffer);
return error("Unable to start request");
}

data = buffer.buffer;
while (i < buffer.posn) {
switch (data[i]) {
case 'P':
i++;
if (i + 52 <= buffer.posn &&
!prefixcmp(data + i, " pack-") &&
!prefixcmp(data + i + 46, ".pack\n")) {
get_sha1_hex(data + i + 6, sha1);
setup_index(repo, sha1);
i += 51;
break;
}
default:
while (i < buffer.posn && data[i] != '\n')
i++;
}
i++;
}

free(buffer.buffer);
repo->got_indices = 1;
return 0;
}

static int fetch_pack(struct 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;
struct slot_results results;

if (fetch_indices(repo))
return -1;
target = find_sha1_pack(sha1, repo->packs);
if (!target)
return -1;

if (get_verbosely) {
fprintf(stderr, "Getting pack %s\n",
sha1_to_hex(target->sha1));
fprintf(stderr, " which contains %s\n",
sha1_to_hex(sha1));
}

url = xmalloc(strlen(repo->base) + 65);
sprintf(url, "%s/objects/pack/pack-%s.pack",
repo->base, sha1_to_hex(target->sha1));

filename = sha1_pack_name(target->sha1);
snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
packfile = fopen(tmpfile, "a");
if (!packfile)
return error("Unable to open local file %s for pack",
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);
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 (results.curl_result != CURLE_OK) {
fclose(packfile);
return error("Unable to get pack file %s\n%s", url,
curl_errorstr);
}
} else {
fclose(packfile);
return error("Unable to start request");
}

target->pack_size = ftell(packfile);
fclose(packfile);

ret = move_temp_to_file(tmpfile, filename);
if (ret)
return ret;

lst = &repo->packs;
while (*lst != target)
lst = &((*lst)->next);
*lst = (*lst)->next;

if (verify_pack(target, 0))
return -1;
install_packed_git(target);

return 0;
}

static void abort_object_request(struct object_request *obj_req)
{
if (obj_req->local >= 0) {
close(obj_req->local);
obj_req->local = -1;
}
unlink(obj_req->tmpfile);
if (obj_req->slot) {
release_active_slot(obj_req->slot);
obj_req->slot = NULL;
}
release_object_request(obj_req);
}

static int fetch_object(struct alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
int ret = 0;
struct object_request *obj_req = object_queue_head;

while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
obj_req = obj_req->next;
if (obj_req == NULL)
return error("Couldn't find request for %s in the queue", hex);

if (has_sha1_file(obj_req->sha1)) {
abort_object_request(obj_req);
return 0;
}

#ifdef USE_CURL_MULTI
while (obj_req->state == WAITING) {
step_active_slots();
}
#else
start_object_request(obj_req);
#endif

while (obj_req->state == ACTIVE) {
run_active_slot(obj_req->slot);
}
if (obj_req->local != -1) {
close(obj_req->local); obj_req->local = -1;
}

if (obj_req->state == ABORTED) {
ret = error("Request for %s aborted", hex);
} else if (obj_req->curl_result != CURLE_OK &&
obj_req->http_code != 416) {
if (missing_target(obj_req))
ret = -1; /* Be silent, it is probably in a pack. */
else
ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
obj_req->errorstr, obj_req->curl_result,
obj_req->http_code, hex);
} else if (obj_req->zret != Z_STREAM_END) {
corrupt_object_found++;
ret = error("File %s (%s) corrupt", hex, obj_req->url);
} else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
ret = error("File %s has bad hash", hex);
} else if (obj_req->rename < 0) {
ret = error("unable to write sha1 filename %s",
obj_req->filename);
}

release_object_request(obj_req);
return ret;
}

int fetch(unsigned char *sha1)
{
struct alt_base *altbase = alt;

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", sha1_to_hex(sha1),
alt->base);
}

static inline int needs_quote(int ch)
{
if (((ch >= 'A') && (ch <= 'Z'))
|| ((ch >= 'a') && (ch <= 'z'))
|| ((ch >= '0') && (ch <= '9'))
|| (ch == '/')
|| (ch == '-')
|| (ch == '.'))
return 0;
return 1;
}

static inline int hex(int v)
{
if (v < 10) return '0' + v;
else return 'A' + v - 10;
}

static char *quote_ref_url(const char *base, const char *ref)
{
const char *cp;
char *dp, *qref;
int len, baselen, ch;

baselen = strlen(base);
len = baselen + 7; /* "/refs/" + NUL */
for (cp = ref; (ch = *cp) != 0; cp++, len++)
if (needs_quote(ch))
len += 2; /* extra two hex plus replacement % */
qref = xmalloc(len);
memcpy(qref, base, baselen);
memcpy(qref + baselen, "/refs/", 6);
for (cp = ref, dp = qref + baselen + 6; (ch = *cp) != 0; cp++) {
if (needs_quote(ch)) {
*dp++ = '%';
*dp++ = hex((ch >> 4) & 0xF);
*dp++ = hex(ch & 0xF);
}
else
*dp++ = ch;
}
*dp = 0;

return qref;
}

int fetch_ref(char *ref, unsigned char *sha1)
{
        char *url;
        char hex[42];
        struct buffer buffer;
const 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 = quote_ref_url(base, ref);
slot = get_active_slot();
slot->results = &results;
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK)
return error("Couldn't get %s for %s\n%s",
url, ref, curl_errorstr);
} else {
return error("Unable to start request");
}

        hex[40] = '\0';
        get_sha1_hex(hex, sha1);
        return 0;
}

int main(int argc, const char **argv)
{
int commits;
const char **write_ref = NULL;
char **commit_id;
const char *url;
char *s;
int arg = 1;
int rc = 0;

setup_git_directory();
git_config(git_default_config);

while (arg < argc && argv[arg][0] == '-') {
if (argv[arg][1] == 't') {
get_tree = 1;
} else if (argv[arg][1] == 'c') {
get_history = 1;
} else if (argv[arg][1] == 'a') {
get_all = 1;
get_tree = 1;
get_history = 1;
} else if (argv[arg][1] == 'v') {
get_verbosely = 1;
} else if (argv[arg][1] == 'w') {
write_ref = &argv[arg + 1];
arg++;
} else if (!strcmp(argv[arg], "--recover")) {
get_recover = 1;
} else if (!strcmp(argv[arg], "--stdin")) {
commits_on_stdin = 1;
}
arg++;
}
if (argc < arg + 2 - commits_on_stdin) {
usage("git-http-fetch [-c] [-t] [-a] [-v] [--recover] [-w ref] [--stdin] commit-id url");
return 1;
}
if (commits_on_stdin) {
commits = pull_targets_stdin(&commit_id, &write_ref);
} else {
commit_id = (char **) &argv[arg++];
commits = 1;
}
url = argv[arg];

http_init();

no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");

alt = xmalloc(sizeof(*alt));
alt->base = xmalloc(strlen(url) + 1);
strcpy(alt->base, url);
for (s = alt->base + strlen(alt->base) - 1; *s == '/'; --s)
*s = 0;
alt->got_indices = 0;
alt->packs = NULL;
alt->next = NULL;

if (pull(commits, commit_id, write_ref, url))
rc = 1;

http_cleanup();

curl_slist_free_all(no_pragma_header);

if (commits_on_stdin)
pull_targets_free(commits, commit_id, write_ref);

if (corrupt_object_found) {
fprintf(stderr,
"Some loose object were found to be corrupt, but they might be just\n"
"a false '404 Not Found' error message sent with incorrect HTTP\n"
"status code. Suggest running git-fsck.\n");
}
return rc;
}
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