http-push: support for updating remote info/refs

If info/refs exists on the remote, get a lock on info/refs, make sure that
there is a local copy of the object referenced in each remote ref (in case
someone else added a tag we don't have locally), do all the refspec updates,
and generate and send an updated info/refs file.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Nick Hengeveld 2006-03-10 20:18:18 -08:00 committed by Junio C Hamano
parent 512d632cf2
commit 197e8951ab

View File

@ -22,6 +22,7 @@ enum XML_Status {
#define XML_STATUS_ERROR 0
#endif
#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30
/* DAV methods */
@ -58,9 +59,10 @@ enum XML_Status {
/* bits #0-4 in revision.h */
#define LOCAL (1u << 5)
#define REMOTE (1u << 6)
#define PUSHING (1u << 7)
#define LOCAL (1u << 5)
#define REMOTE (1u << 6)
#define FETCHING (1u << 7)
#define PUSHING (1u << 8)
static int pushing = 0;
static int aborted = 0;
@ -79,6 +81,9 @@ struct repo
{
char *url;
int path_len;
int has_info_refs;
int can_update_info_refs;
int has_info_packs;
struct packed_git *packs;
struct remote_lock *locks;
};
@ -86,6 +91,9 @@ struct repo
static struct repo *remote = NULL;
enum transfer_state {
NEED_FETCH,
RUN_FETCH_LOOSE,
RUN_FETCH_PACKED,
NEED_PUSH,
RUN_MKCOL,
RUN_PUT,
@ -104,6 +112,8 @@ struct transfer_request
struct buffer buffer;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int local_fileno;
FILE *local_stream;
enum transfer_state state;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
@ -113,6 +123,7 @@ struct transfer_request
z_stream stream;
int zret;
int rename;
void *userData;
struct active_request_slot *slot;
struct transfer_request *next;
};
@ -159,6 +170,7 @@ struct remote_ls_ctx
};
static void finish_request(struct transfer_request *request);
static void release_request(struct transfer_request *request);
static void process_response(void *callback_data)
{
@ -168,6 +180,258 @@ static void process_response(void *callback_data)
finish_request(request);
}
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(request->local_fileno,
ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);
request->stream.avail_in = size;
request->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);
data_received++;
return size;
}
static void start_fetch_loose(struct transfer_request *request)
{
char *hex = sha1_to_hex(request->obj->sha1);
char *filename;
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;
filename = sha1_file_name(request->obj->sha1);
snprintf(request->filename, sizeof(request->filename), "%s", filename);
snprintf(request->tmpfile, sizeof(request->tmpfile),
"%s.temp", filename);
snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
unlink(prevfile);
rename(request->tmpfile, prevfile);
unlink(request->tmpfile);
if (request->local_fileno != -1)
error("fd leakage in start: %d", request->local_fileno);
request->local_fileno = 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_fileno < 0 && errno == ENOENT) {
char *dir = strrchr(request->tmpfile, '/');
if (dir) {
*dir = 0;
mkdir(request->tmpfile, 0777);
*dir = '/';
}
request->local_fileno = open(request->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
}
if (request->local_fileno < 0) {
request->state = ABORTED;
error("Couldn't create temporary file %s for %s: %s",
request->tmpfile, request->filename, strerror(errno));
return;
}
memset(&request->stream, 0, sizeof(request->stream));
inflateInit(&request->stream);
SHA1_Init(&request->c);
url = xmalloc(strlen(remote->url) + 50);
request->url = xmalloc(strlen(remote->url) + 50);
strcpy(url, remote->url);
posn = url + strlen(remote->url);
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_fileno, SEEK_SET, 0);
ftruncate(request->local_fileno, 0);
}
}
slot = get_active_slot();
slot->callback_func = process_response;
slot->callback_data = request;
request->slot = 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 (push_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 */
request->state = RUN_FETCH_LOOSE;
if (!start_active_slot(slot)) {
fprintf(stderr, "Unable to start GET request\n");
remote->can_update_info_refs = 0;
release_request(request);
}
}
static void start_fetch_packed(struct transfer_request *request)
{
char *url;
struct packed_git *target;
FILE *packfile;
char *filename;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
struct transfer_request *check_request = request_queue_head;
struct active_request_slot *slot;
target = find_sha1_pack(request->obj->sha1, remote->packs);
if (!target) {
fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
remote->can_update_info_refs = 0;
release_request(request);
return;
}
fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
filename = sha1_pack_name(target->sha1);
snprintf(request->filename, sizeof(request->filename), "%s", filename);
snprintf(request->tmpfile, sizeof(request->tmpfile),
"%s.temp", filename);
url = xmalloc(strlen(remote->url) + 64);
sprintf(url, "%sobjects/pack/pack-%s.pack",
remote->url, sha1_to_hex(target->sha1));
/* Make sure there isn't another open request for this pack */
while (check_request) {
if (check_request->state == RUN_FETCH_PACKED &&
!strcmp(check_request->url, url)) {
free(url);
release_request(request);
return;
}
check_request = check_request->next;
}
packfile = fopen(request->tmpfile, "a");
if (!packfile) {
fprintf(stderr, "Unable to open local file %s for pack",
filename);
remote->can_update_info_refs = 0;
free(url);
return;
}
slot = get_active_slot();
slot->callback_func = process_response;
slot->callback_data = request;
request->slot = slot;
request->local_stream = packfile;
request->userData = target;
request->url = url;
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 (push_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);
}
/* Try to get the request started, abort the request on error */
request->state = RUN_FETCH_PACKED;
if (!start_active_slot(slot)) {
fprintf(stderr, "Unable to start GET request\n");
remote->can_update_info_refs = 0;
release_request(request);
}
}
static void start_mkcol(struct transfer_request *request)
{
char *hex = sha1_to_hex(request->obj->sha1);
@ -388,6 +652,10 @@ static void release_request(struct transfer_request *request)
entry->next = entry->next->next;
}
if (request->local_fileno != -1)
close(request->local_fileno);
if (request->local_stream)
fclose(request->local_stream);
if (request->url != NULL)
free(request->url);
free(request);
@ -395,7 +663,11 @@ static void release_request(struct transfer_request *request)
static void finish_request(struct transfer_request *request)
{
request->curl_result = request->slot->curl_result;
struct stat st;
struct packed_git *target;
struct packed_git **lst;
request->curl_result = request->slot->curl_result;
request->http_code = request->slot->http_code;
request->slot = NULL;
@ -437,7 +709,6 @@ static void finish_request(struct transfer_request *request)
if (request->curl_result == CURLE_OK) {
fprintf(stderr, " sent %s\n",
sha1_to_hex(request->obj->sha1));
request->state = COMPLETE;
request->obj->flags |= REMOTE;
release_request(request);
} else {
@ -447,12 +718,73 @@ static void finish_request(struct transfer_request *request)
request->state = ABORTED;
aborted = 1;
}
} else if (request->state == RUN_FETCH_LOOSE) {
fchmod(request->local_fileno, 0444);
close(request->local_fileno); request->local_fileno = -1;
if (request->curl_result != CURLE_OK &&
request->http_code != 416) {
if (stat(request->tmpfile, &st) == 0) {
if (st.st_size == 0)
unlink(request->tmpfile);
}
} else {
if (request->http_code == 416)
fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
inflateEnd(&request->stream);
SHA1_Final(request->real_sha1, &request->c);
if (request->zret != Z_STREAM_END) {
unlink(request->tmpfile);
} else if (memcmp(request->obj->sha1, request->real_sha1, 20)) {
unlink(request->tmpfile);
} else {
request->rename =
move_temp_to_file(
request->tmpfile,
request->filename);
if (request->rename == 0) {
request->obj->flags |= (LOCAL | REMOTE);
}
}
}
/* Try fetching packed if necessary */
if (request->obj->flags & LOCAL)
release_request(request);
else
start_fetch_packed(request);
} else if (request->state == RUN_FETCH_PACKED) {
if (request->curl_result != CURLE_OK) {
fprintf(stderr, "Unable to get pack file %s\n%s",
request->url, curl_errorstr);
remote->can_update_info_refs = 0;
} else {
fclose(request->local_stream);
request->local_stream = NULL;
if (!move_temp_to_file(request->tmpfile,
request->filename)) {
target = (struct packed_git *)request->userData;
lst = &remote->packs;
while (*lst != target)
lst = &((*lst)->next);
*lst = (*lst)->next;
if (!verify_pack(target, 0))
install_packed_git(target);
else
remote->can_update_info_refs = 0;
}
}
release_request(request);
}
}
void fill_active_slots(void)
{
struct transfer_request *request = request_queue_head;
struct transfer_request *next;
struct active_request_slot *slot = active_queue_head;
int num_transfers;
@ -460,7 +792,10 @@ void fill_active_slots(void)
return;
while (active_requests < max_requests && request != NULL) {
if (pushing && request->state == NEED_PUSH) {
next = request->next;
if (request->state == NEED_FETCH) {
start_fetch_loose(request);
} else if (pushing && request->state == NEED_PUSH) {
if (remote_dir_exists[request->obj->sha1[0]] == 1) {
start_put(request);
} else {
@ -468,7 +803,7 @@ void fill_active_slots(void)
}
curl_multi_perform(curlm, &num_transfers);
}
request = request->next;
request = next;
}
while (slot != NULL) {
@ -482,7 +817,38 @@ void fill_active_slots(void)
static void get_remote_object_list(unsigned char parent);
static void add_request(struct object *obj, struct remote_lock *lock)
static void add_fetch_request(struct object *obj)
{
struct transfer_request *request;
check_locks();
/*
* Don't fetch the object if it's known to exist locally
* or is already in the request queue
*/
if (remote_dir_exists[obj->sha1[0]] == -1)
get_remote_object_list(obj->sha1[0]);
if (obj->flags & (LOCAL | FETCHING))
return;
obj->flags |= FETCHING;
request = xmalloc(sizeof(*request));
request->obj = obj;
request->url = NULL;
request->lock = NULL;
request->headers = NULL;
request->local_fileno = -1;
request->local_stream = NULL;
request->state = NEED_FETCH;
request->next = request_queue_head;
request_queue_head = request;
fill_active_slots();
step_active_slots();
}
static void add_send_request(struct object *obj, struct remote_lock *lock)
{
struct transfer_request *request = request_queue_head;
struct packed_git *target;
@ -510,6 +876,8 @@ static void add_request(struct object *obj, struct remote_lock *lock)
request->url = NULL;
request->lock = lock;
request->headers = NULL;
request->local_fileno = -1;
request->local_stream = NULL;
request->state = NEED_PUSH;
request->next = request_queue_head;
request_queue_head = request;
@ -1375,7 +1743,7 @@ static void get_delta(struct rev_info *revs, struct remote_lock *lock)
p = process_tree(commit->tree, p, NULL, "");
commit->object.flags |= LOCAL;
if (!(commit->object.flags & UNINTERESTING))
add_request(&commit->object, lock);
add_send_request(&commit->object, lock);
}
for (pending = revs->pending_objects; pending; pending = pending->next) {
@ -1402,7 +1770,7 @@ static void get_delta(struct rev_info *revs, struct remote_lock *lock)
while (objects) {
if (!(objects->item->flags & UNINTERESTING))
add_request(objects->item, lock);
add_send_request(objects->item, lock);
objects = objects->next;
}
}
@ -1483,6 +1851,7 @@ static void one_remote_ref(char *refname)
{
struct ref *ref;
unsigned char remote_sha1[20];
struct object *obj;
if (fetch_ref(refname, remote_sha1) != 0) {
fprintf(stderr,
@ -1491,6 +1860,19 @@ static void one_remote_ref(char *refname)
return;
}
/*
* Fetch a copy of the object if it doesn't exist locally - it
* may be required for updating server info later.
*/
if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
obj = lookup_unknown_object(remote_sha1);
if (obj) {
fprintf(stderr, " fetch %s for %s\n",
sha1_to_hex(remote_sha1), refname);
add_fetch_request(obj);
}
}
int len = strlen(refname) + 1;
ref = xcalloc(1, sizeof(*ref) + len);
memcpy(ref->old_sha1, remote_sha1, 20);
@ -1596,6 +1978,125 @@ static void mark_edges_uninteresting(struct commit_list *list)
}
}
static void add_remote_info_ref(struct remote_ls_ctx *ls)
{
struct buffer *buf = (struct buffer *)ls->userData;
unsigned char remote_sha1[20];
struct object *o;
int len;
char *ref_info;
if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
fprintf(stderr,
"Unable to fetch ref %s from %s\n",
ls->dentry_name, remote->url);
aborted = 1;
return;
}
o = parse_object(remote_sha1);
if (!o) {
fprintf(stderr,
"Unable to parse object %s for remote ref %s\n",
sha1_to_hex(remote_sha1), ls->dentry_name);
aborted = 1;
return;
}
len = strlen(ls->dentry_name) + 42;
ref_info = xcalloc(len + 1, 1);
sprintf(ref_info, "%s %s\n",
sha1_to_hex(remote_sha1), ls->dentry_name);
fwrite_buffer(ref_info, 1, len, buf);
free(ref_info);
if (o->type == tag_type) {
o = deref_tag(o, ls->dentry_name, 0);
if (o) {
len = strlen(ls->dentry_name) + 45;
ref_info = xcalloc(len + 1, 1);
sprintf(ref_info, "%s %s^{}\n",
sha1_to_hex(o->sha1), ls->dentry_name);
fwrite_buffer(ref_info, 1, len, buf);
free(ref_info);
}
}
}
static void update_remote_info_refs(struct remote_lock *lock)
{
struct buffer buffer;
struct active_request_slot *slot;
struct slot_results results;
char *if_header;
struct curl_slist *dav_headers = NULL;
buffer.buffer = xmalloc(4096);
memset(buffer.buffer, 0, 4096);
buffer.size = 4096;
buffer.posn = 0;
remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
add_remote_info_ref, &buffer);
if (!aborted) {
if_header = xmalloc(strlen(lock->token) + 25);
sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
dav_headers = curl_slist_append(dav_headers, if_header);
slot = get_active_slot();
slot->results = &results;
curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
buffer.posn = 0;
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK) {
fprintf(stderr,
"PUT error: curl result=%d, HTTP code=%ld\n",
results.curl_result, results.http_code);
}
}
free(if_header);
}
free(buffer.buffer);
}
static int remote_exists(const char *path)
{
char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
struct active_request_slot *slot;
struct slot_results results;
sprintf(url, "%s%s", remote->url, path);
slot = get_active_slot();
slot->results = &results;
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.http_code == 404)
return 0;
else if (results.curl_result == CURLE_OK)
return 1;
else
fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
} else {
fprintf(stderr, "Unable to start HEAD request\n");
}
return -1;
}
int main(int argc, char **argv)
{
struct transfer_request *request;
@ -1603,6 +2104,7 @@ int main(int argc, char **argv)
int nr_refspec = 0;
char **refspec = NULL;
struct remote_lock *ref_lock = NULL;
struct remote_lock *info_ref_lock = NULL;
struct rev_info revs;
int rc = 0;
int i;
@ -1667,6 +2169,18 @@ int main(int argc, char **argv)
goto cleanup;
}
/* Check whether the remote has server info files */
remote->can_update_info_refs = 0;
remote->has_info_refs = remote_exists("info/refs");
remote->has_info_packs = remote_exists("objects/info/packs");
if (remote->has_info_refs) {
info_ref_lock = lock_remote("info/refs", LOCK_TIME);
if (info_ref_lock)
remote->can_update_info_refs = 1;
}
if (remote->has_info_packs)
fetch_indices();
/* Get a list of all local and remote heads to validate refspecs */
get_local_heads();
fprintf(stderr, "Fetching remote heads...\n");
@ -1769,7 +2283,6 @@ int main(int argc, char **argv)
pushing = 0;
prepare_revision_walk(&revs);
mark_edges_uninteresting(revs.commits);
fetch_indices();
get_delta(&revs, ref_lock);
finish_all_active_slots();
@ -1792,6 +2305,18 @@ int main(int argc, char **argv)
check_locks();
}
/* Update remote server info if appropriate */
if (remote->has_info_refs && new_refs) {
if (info_ref_lock && remote->can_update_info_refs) {
fprintf(stderr, "Updating remote server info\n");
update_remote_info_refs(info_ref_lock);
} else {
fprintf(stderr, "Unable to update server info\n");
}
}
if (info_ref_lock)
unlock_remote(info_ref_lock);
cleanup:
free(remote);