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git/http-push.c

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#include "cache.h"
#include "commit.h"
#include "pack.h"
#include "fetch.h"
#include "tag.h"
#include "blob.h"
#include "http.h"
#include <expat.h>
static const char http_push_usage[] =
"git-http-push [--complete] [--force] [--verbose] <url> <ref> [<ref>...]\n";
#ifndef XML_STATUS_OK
enum XML_Status {
XML_STATUS_OK = 1,
XML_STATUS_ERROR = 0
};
#define XML_STATUS_OK 1
#define XML_STATUS_ERROR 0
#endif
#define RANGE_HEADER_SIZE 30
/* DAV methods */
#define DAV_LOCK "LOCK"
#define DAV_MKCOL "MKCOL"
#define DAV_MOVE "MOVE"
#define DAV_PROPFIND "PROPFIND"
#define DAV_PUT "PUT"
#define DAV_UNLOCK "UNLOCK"
/* DAV lock flags */
#define DAV_PROP_LOCKWR (1u << 0)
#define DAV_PROP_LOCKEX (1u << 1)
#define DAV_LOCK_OK (1u << 2)
/* DAV XML properties */
#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
/* DAV request body templates */
#define PROPFIND_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
#define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
#define LOCK_TIME 600
#define LOCK_REFRESH 30
static int pushing = 0;
static int aborted = 0;
static char remote_dir_exists[256];
static struct curl_slist *no_pragma_header;
static struct curl_slist *default_headers;
static int push_verbosely = 0;
static int push_all = 0;
static int force_all = 0;
struct repo
{
char *url;
struct packed_git *packs;
};
static struct repo *remote = NULL;
enum transfer_state {
NEED_CHECK,
RUN_HEAD,
NEED_PUSH,
RUN_MKCOL,
RUN_PUT,
RUN_MOVE,
ABORTED,
COMPLETE,
};
struct transfer_request
{
unsigned char sha1[20];
char *url;
char *dest;
struct active_lock *lock;
struct curl_slist *headers;
struct buffer buffer;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
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 struct transfer_request *request_queue_head = NULL;
struct xml_ctx
{
char *name;
int len;
char *cdata;
void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
void *userData;
};
struct active_lock
{
char *url;
char *owner;
char *token;
time_t start_time;
long timeout;
int refreshing;
};
static void finish_request(struct transfer_request *request);
static void process_response(void *callback_data)
{
struct transfer_request *request =
(struct transfer_request *)callback_data;
finish_request(request);
}
static void start_check(struct transfer_request *request)
{
char *hex = sha1_to_hex(request->sha1);
struct active_request_slot *slot;
char *posn;
request->url = xmalloc(strlen(remote->url) + 55);
strcpy(request->url, remote->url);
posn = request->url + strlen(remote->url);
strcpy(posn, "objects/");
posn += 8;
memcpy(posn, hex, 2);
posn += 2;
*(posn++) = '/';
strcpy(posn, hex + 2);
slot = get_active_slot();
slot->callback_func = process_response;
slot->callback_data = request;
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
if (start_active_slot(slot)) {
request->slot = slot;
request->state = RUN_HEAD;
} else {
request->state = ABORTED;
free(request->url);
request->url = NULL;
}
}
static void start_mkcol(struct transfer_request *request)
{
char *hex = sha1_to_hex(request->sha1);
struct active_request_slot *slot;
char *posn;
request->url = xmalloc(strlen(remote->url) + 13);
strcpy(request->url, remote->url);
posn = request->url + strlen(remote->url);
strcpy(posn, "objects/");
posn += 8;
memcpy(posn, hex, 2);
posn += 2;
strcpy(posn, "/");
slot = get_active_slot();
slot->callback_func = process_response;
slot->callback_data = request;
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
if (start_active_slot(slot)) {
request->slot = slot;
request->state = RUN_MKCOL;
} else {
request->state = ABORTED;
free(request->url);
request->url = NULL;
}
}
static void start_put(struct transfer_request *request)
{
char *hex = sha1_to_hex(request->sha1);
struct active_request_slot *slot;
char *posn;
char type[20];
char hdr[50];
void *unpacked;
unsigned long len;
int hdrlen;
ssize_t size;
z_stream stream;
unpacked = read_sha1_file(request->sha1, type, &len);
hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
/* Set it up */
memset(&stream, 0, sizeof(stream));
deflateInit(&stream, Z_BEST_COMPRESSION);
size = deflateBound(&stream, len + hdrlen);
request->buffer.buffer = xmalloc(size);
/* Compress it */
stream.next_out = request->buffer.buffer;
stream.avail_out = size;
/* First header.. */
stream.next_in = (void *)hdr;
stream.avail_in = hdrlen;
while (deflate(&stream, 0) == Z_OK)
/* nothing */;
/* Then the data itself.. */
stream.next_in = unpacked;
stream.avail_in = len;
while (deflate(&stream, Z_FINISH) == Z_OK)
/* nothing */;
deflateEnd(&stream);
free(unpacked);
request->buffer.size = stream.total_out;
request->buffer.posn = 0;
request->url = xmalloc(strlen(remote->url) +
strlen(request->lock->token) + 51);
strcpy(request->url, remote->url);
posn = request->url + strlen(remote->url);
strcpy(posn, "objects/");
posn += 8;
memcpy(posn, hex, 2);
posn += 2;
*(posn++) = '/';
strcpy(posn, hex + 2);
request->dest = xmalloc(strlen(request->url) + 14);
sprintf(request->dest, "Destination: %s", request->url);
posn += 38;
*(posn++) = '.';
strcpy(posn, request->lock->token);
slot = get_active_slot();
slot->callback_func = process_response;
slot->callback_data = request;
curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
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_UPLOAD, 1);
curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
if (start_active_slot(slot)) {
request->slot = slot;
request->state = RUN_PUT;
} else {
request->state = ABORTED;
free(request->url);
request->url = NULL;
}
}
static void start_move(struct transfer_request *request)
{
struct active_request_slot *slot;
struct curl_slist *dav_headers = NULL;
slot = get_active_slot();
slot->callback_func = process_response;
slot->callback_data = request;
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
dav_headers = curl_slist_append(dav_headers, request->dest);
dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
if (start_active_slot(slot)) {
request->slot = slot;
request->state = RUN_MOVE;
} else {
request->state = ABORTED;
free(request->url);
request->url = NULL;
}
}
static int refresh_lock(struct active_lock *lock)
{
struct active_request_slot *slot;
char *if_header;
char timeout_header[25];
struct curl_slist *dav_headers = NULL;
int rc = 0;
lock->refreshing = 1;
if_header = xmalloc(strlen(lock->token) + 25);
sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
dav_headers = curl_slist_append(dav_headers, if_header);
dav_headers = curl_slist_append(dav_headers, timeout_header);
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (slot->curl_result != CURLE_OK) {
fprintf(stderr, "Got HTTP error %ld\n", slot->http_code);
} else {
lock->start_time = time(NULL);
rc = 1;
}
}
lock->refreshing = 0;
curl_slist_free_all(dav_headers);
free(if_header);
return rc;
}
static void finish_request(struct transfer_request *request)
{
time_t current_time = time(NULL);
int time_remaining;
request->curl_result = request->slot->curl_result;
request->http_code = request->slot->http_code;
request->slot = NULL;
/* Refresh the lock if it is close to timing out */
time_remaining = request->lock->start_time + request->lock->timeout
- current_time;
if (time_remaining < LOCK_REFRESH && !request->lock->refreshing) {
if (!refresh_lock(request->lock)) {
fprintf(stderr, "Unable to refresh remote lock\n");
aborted = 1;
}
}
if (request->headers != NULL)
curl_slist_free_all(request->headers);
/* URL is reused for MOVE after PUT */
if (request->state != RUN_PUT) {
free(request->url);
request->url = NULL;
}
if (request->state == RUN_HEAD) {
if (request->http_code == 404) {
request->state = NEED_PUSH;
} else if (request->curl_result == CURLE_OK) {
remote_dir_exists[request->sha1[0]] = 1;
request->state = COMPLETE;
} else {
fprintf(stderr, "HEAD %s failed, aborting (%d/%ld)\n",
sha1_to_hex(request->sha1),
request->curl_result, request->http_code);
request->state = ABORTED;
aborted = 1;
}
} else if (request->state == RUN_MKCOL) {
if (request->curl_result == CURLE_OK ||
request->http_code == 405) {
remote_dir_exists[request->sha1[0]] = 1;
start_put(request);
} else {
fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
sha1_to_hex(request->sha1),
request->curl_result, request->http_code);
request->state = ABORTED;
aborted = 1;
}
} else if (request->state == RUN_PUT) {
if (request->curl_result == CURLE_OK) {
start_move(request);
} else {
fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
sha1_to_hex(request->sha1),
request->curl_result, request->http_code);
request->state = ABORTED;
aborted = 1;
}
} else if (request->state == RUN_MOVE) {
if (request->curl_result == CURLE_OK) {
if (push_verbosely)
fprintf(stderr,
"sent %s\n",
sha1_to_hex(request->sha1));
request->state = COMPLETE;
} else {
fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
sha1_to_hex(request->sha1),
request->curl_result, request->http_code);
request->state = ABORTED;
aborted = 1;
}
}
}
static void release_request(struct transfer_request *request)
{
struct transfer_request *entry = request_queue_head;
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;
}
if (request->url != NULL)
free(request->url);
free(request);
}
void fill_active_slots(void)
{
struct transfer_request *request = request_queue_head;
struct active_request_slot *slot = active_queue_head;
int num_transfers;
if (aborted)
return;
while (active_requests < max_requests && request != NULL) {
if (!pushing && request->state == NEED_CHECK) {
start_check(request);
curl_multi_perform(curlm, &num_transfers);
} else if (pushing && request->state == NEED_PUSH) {
if (remote_dir_exists[request->sha1[0]])
start_put(request);
else
start_mkcol(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;
}
}
static void add_request(unsigned char *sha1, struct active_lock *lock)
{
struct transfer_request *request = request_queue_head;
struct packed_git *target;
while (request != NULL && memcmp(request->sha1, sha1, 20))
request = request->next;
if (request != NULL)
return;
target = find_sha1_pack(sha1, remote->packs);
if (target)
return;
request = xmalloc(sizeof(*request));
memcpy(request->sha1, sha1, 20);
request->url = NULL;
request->lock = lock;
request->headers = NULL;
request->state = NEED_CHECK;
request->next = request_queue_head;
request_queue_head = request;
fill_active_slots();
step_active_slots();
}
static int fetch_index(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;
/* Don't use the index if the pack isn't there */
url = xmalloc(strlen(remote->url) + 65);
sprintf(url, "%s/objects/pack/pack-%s.pack", remote->url, hex);
slot = get_active_slot();
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 (slot->curl_result != CURLE_OK) {
free(url);
return error("Unable to verify pack %s is available",
hex);
}
} else {
return error("Unable to start request");
}
if (has_pack_index(sha1))
return 0;
if (push_verbosely)
fprintf(stderr, "Getting index for pack %s\n", hex);
sprintf(url, "%s/objects/pack/pack-%s.idx", remote->url, 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();
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
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 (push_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) {
free(url);
fclose(indexfile);
return error("Unable to get pack index %s\n%s", url,
curl_errorstr);
}
} else {
free(url);
fclose(indexfile);
return error("Unable to start request");
}
free(url);
fclose(indexfile);
return move_temp_to_file(tmpfile, filename);
}
static int setup_index(unsigned char *sha1)
{
struct packed_git *new_pack;
if (fetch_index(sha1))
return -1;
new_pack = parse_pack_index(sha1);
new_pack->next = remote->packs;
remote->packs = new_pack;
return 0;
}
static int fetch_indices(void)
{
unsigned char sha1[20];
char *url;
struct buffer buffer;
char *data;
int i = 0;
struct active_request_slot *slot;
data = xmalloc(4096);
memset(data, 0, 4096);
buffer.size = 4096;
buffer.posn = 0;
buffer.buffer = data;
if (push_verbosely)
fprintf(stderr, "Getting pack list\n");
url = xmalloc(strlen(remote->url) + 21);
sprintf(url, "%s/objects/info/packs", remote->url);
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);
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);
free(url);
if (slot->http_code == 404)
return 0;
else
return error("%s", curl_errorstr);
}
} else {
free(buffer.buffer);
free(url);
return error("Unable to start request");
}
free(url);
data = buffer.buffer;
while (i < buffer.posn) {
switch (data[i]) {
case 'P':
i++;
if (i + 52 < buffer.posn &&
!strncmp(data + i, " pack-", 6) &&
!strncmp(data + i + 46, ".pack\n", 6)) {
get_sha1_hex(data + i + 6, sha1);
setup_index(sha1);
i += 51;
break;
}
default:
while (data[i] != '\n')
i++;
}
i++;
}
free(buffer.buffer);
return 0;
}
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 + 12; /* "refs/heads/" + 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/heads/", 11);
for (cp = ref, dp = qref + baselen + 11; (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;
char *base = remote->url;
struct active_request_slot *slot;
buffer.size = 41;
buffer.posn = 0;
buffer.buffer = hex;
hex[41] = '\0';
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);
return 0;
}
static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
{
int *lock_flags = (int *)ctx->userData;
if (tag_closed) {
if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
if ((*lock_flags & DAV_PROP_LOCKEX) &&
(*lock_flags & DAV_PROP_LOCKWR)) {
*lock_flags |= DAV_LOCK_OK;
}
*lock_flags &= DAV_LOCK_OK;
} else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
*lock_flags |= DAV_PROP_LOCKWR;
} else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
*lock_flags |= DAV_PROP_LOCKEX;
}
}
}
static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
{
struct active_lock *lock = (struct active_lock *)ctx->userData;
if (tag_closed && ctx->cdata) {
if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
lock->owner = xmalloc(strlen(ctx->cdata) + 1);
strcpy(lock->owner, ctx->cdata);
} else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
if (!strncmp(ctx->cdata, "Second-", 7))
lock->timeout =
strtol(ctx->cdata + 7, NULL, 10);
} else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
lock->token = xmalloc(strlen(ctx->cdata - 15));
strcpy(lock->token, ctx->cdata + 16);
}
}
}
}
static void
xml_start_tag(void *userData, const char *name, const char **atts)
{
struct xml_ctx *ctx = (struct xml_ctx *)userData;
const char *c = index(name, ':');
int new_len;
if (c == NULL)
c = name;
else
c++;
new_len = strlen(ctx->name) + strlen(c) + 2;
if (new_len > ctx->len) {
ctx->name = xrealloc(ctx->name, new_len);
ctx->len = new_len;
}
strcat(ctx->name, ".");
strcat(ctx->name, c);
if (ctx->cdata) {
free(ctx->cdata);
ctx->cdata = NULL;
}
ctx->userFunc(ctx, 0);
}
static void
xml_end_tag(void *userData, const char *name)
{
struct xml_ctx *ctx = (struct xml_ctx *)userData;
const char *c = index(name, ':');
char *ep;
ctx->userFunc(ctx, 1);
if (c == NULL)
c = name;
else
c++;
ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
*ep = 0;
}
static void
xml_cdata(void *userData, const XML_Char *s, int len)
{
struct xml_ctx *ctx = (struct xml_ctx *)userData;
if (ctx->cdata)
free(ctx->cdata);
ctx->cdata = xcalloc(len+1, 1);
strncpy(ctx->cdata, s, len);
}
static struct active_lock *lock_remote(char *file, long timeout)
{
struct active_request_slot *slot;
struct buffer out_buffer;
struct buffer in_buffer;
char *out_data;
char *in_data;
char *url;
char *ep;
char timeout_header[25];
struct active_lock *new_lock = NULL;
XML_Parser parser = XML_ParserCreate(NULL);
enum XML_Status result;
struct curl_slist *dav_headers = NULL;
struct xml_ctx ctx;
url = xmalloc(strlen(remote->url) + strlen(file) + 1);
sprintf(url, "%s%s", remote->url, file);
/* Make sure leading directories exist for the remote ref */
ep = strchr(url + strlen(remote->url) + 11, '/');
while (ep) {
*ep = 0;
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (slot->curl_result != CURLE_OK &&
slot->http_code != 405) {
fprintf(stderr,
"Unable to create branch path %s\n",
url);
free(url);
return NULL;
}
} else {
fprintf(stderr, "Unable to start request\n");
free(url);
return NULL;
}
*ep = '/';
ep = strchr(ep + 1, '/');
}
out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
out_data = xmalloc(out_buffer.size + 1);
snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
out_buffer.posn = 0;
out_buffer.buffer = out_data;
in_buffer.size = 4096;
in_data = xmalloc(in_buffer.size);
in_buffer.posn = 0;
in_buffer.buffer = in_data;
sprintf(timeout_header, "Timeout: Second-%ld", timeout);
dav_headers = curl_slist_append(dav_headers, timeout_header);
dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
new_lock = xcalloc(1, sizeof(*new_lock));
new_lock->owner = NULL;
new_lock->token = NULL;
new_lock->timeout = -1;
new_lock->refreshing = 0;
if (start_active_slot(slot)) {
run_active_slot(slot);
if (slot->curl_result == CURLE_OK) {
ctx.name = xcalloc(10, 1);
ctx.len = 0;
ctx.cdata = NULL;
ctx.userFunc = handle_new_lock_ctx;
ctx.userData = new_lock;
XML_SetUserData(parser, &ctx);
XML_SetElementHandler(parser, xml_start_tag,
xml_end_tag);
XML_SetCharacterDataHandler(parser, xml_cdata);
result = XML_Parse(parser, in_buffer.buffer,
in_buffer.posn, 1);
free(ctx.name);
if (result != XML_STATUS_OK) {
fprintf(stderr, "XML error: %s\n",
XML_ErrorString(
XML_GetErrorCode(parser)));
new_lock->timeout = -1;
}
}
} else {
fprintf(stderr, "Unable to start request\n");
}
curl_slist_free_all(dav_headers);
free(out_data);
free(in_data);
if (new_lock->token == NULL || new_lock->timeout <= 0) {
if (new_lock->token != NULL)
free(new_lock->token);
if (new_lock->owner != NULL)
free(new_lock->owner);
free(url);
free(new_lock);
new_lock = NULL;
} else {
new_lock->url = url;
new_lock->start_time = time(NULL);
}
return new_lock;
}
static int unlock_remote(struct active_lock *lock)
{
struct active_request_slot *slot;
char *lock_token_header;
struct curl_slist *dav_headers = NULL;
int rc = 0;
lock_token_header = xmalloc(strlen(lock->token) + 31);
sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
lock->token);
dav_headers = curl_slist_append(dav_headers, lock_token_header);
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (slot->curl_result == CURLE_OK)
rc = 1;
else
fprintf(stderr, "Got HTTP error %ld\n",
slot->http_code);
} else {
fprintf(stderr, "Unable to start request\n");
}
curl_slist_free_all(dav_headers);
free(lock_token_header);
if (lock->owner != NULL)
free(lock->owner);
free(lock->url);
/* Freeing the token causes a segfault...
free(lock->token);
*/
free(lock);
return rc;
}
static int locking_available(void)
{
struct active_request_slot *slot;
struct buffer in_buffer;
struct buffer out_buffer;
char *in_data;
char *out_data;
XML_Parser parser = XML_ParserCreate(NULL);
enum XML_Status result;
struct curl_slist *dav_headers = NULL;
struct xml_ctx ctx;
int lock_flags = 0;
out_buffer.size = strlen(PROPFIND_REQUEST) + strlen(remote->url) - 2;
out_data = xmalloc(out_buffer.size + 1);
snprintf(out_data, out_buffer.size + 1, PROPFIND_REQUEST, remote->url);
out_buffer.posn = 0;
out_buffer.buffer = out_data;
in_buffer.size = 4096;
in_data = xmalloc(in_buffer.size);
in_buffer.posn = 0;
in_buffer.buffer = in_data;
dav_headers = curl_slist_append(dav_headers, "Depth: 0");
dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (slot->curl_result == CURLE_OK) {
ctx.name = xcalloc(10, 1);
ctx.len = 0;
ctx.cdata = NULL;
ctx.userFunc = handle_lockprop_ctx;
ctx.userData = &lock_flags;
XML_SetUserData(parser, &ctx);
XML_SetElementHandler(parser, xml_start_tag,
xml_end_tag);
result = XML_Parse(parser, in_buffer.buffer,
in_buffer.posn, 1);
free(ctx.name);
if (result != XML_STATUS_OK) {
fprintf(stderr, "XML error: %s\n",
XML_ErrorString(
XML_GetErrorCode(parser)));
lock_flags = 0;
}
}
} else {
fprintf(stderr, "Unable to start request\n");
}
free(out_data);
free(in_buffer.buffer);
curl_slist_free_all(dav_headers);
return lock_flags;
}
static int is_ancestor(unsigned char *sha1, struct commit *commit)
{
struct commit_list *parents;
if (parse_commit(commit))
return 0;
parents = commit->parents;
for (; parents; parents = parents->next) {
if (!memcmp(sha1, parents->item->object.sha1, 20)) {
return 1;
} else if (parents->item->object.type == commit_type) {
if (is_ancestor(
sha1,
(struct commit *)&parents->item->object
))
return 1;
}
}
return 0;
}
static void get_delta(unsigned char *sha1, struct object *obj,
struct active_lock *lock)
{
struct commit *commit;
struct commit_list *parents;
struct tree *tree;
struct tree_entry_list *entry;
if (sha1 && !memcmp(sha1, obj->sha1, 20))
return;
if (aborted)
return;
if (obj->type == commit_type) {
if (push_verbosely)
fprintf(stderr, "walk %s\n", sha1_to_hex(obj->sha1));
add_request(obj->sha1, lock);
commit = (struct commit *)obj;
if (parse_commit(commit)) {
fprintf(stderr, "Error parsing commit %s\n",
sha1_to_hex(obj->sha1));
aborted = 1;
return;
}
parents = commit->parents;
for (; parents; parents = parents->next)
if (sha1 == NULL ||
memcmp(sha1, parents->item->object.sha1, 20))
get_delta(sha1, &parents->item->object,
lock);
get_delta(sha1, &commit->tree->object, lock);
} else if (obj->type == tree_type) {
if (push_verbosely)
fprintf(stderr, "walk %s\n", sha1_to_hex(obj->sha1));
add_request(obj->sha1, lock);
tree = (struct tree *)obj;
if (parse_tree(tree)) {
fprintf(stderr, "Error parsing tree %s\n",
sha1_to_hex(obj->sha1));
aborted = 1;
return;
}
entry = tree->entries;
tree->entries = NULL;
while (entry) {
struct tree_entry_list *next = entry->next;
get_delta(sha1, entry->item.any, lock);
free(entry->name);
free(entry);
entry = next;
}
} else if (obj->type == blob_type || obj->type == tag_type) {
add_request(obj->sha1, lock);
}
}
static int update_remote(unsigned char *sha1, struct active_lock *lock)
{
struct active_request_slot *slot;
char *out_data;
char *if_header;
struct buffer out_buffer;
struct curl_slist *dav_headers = NULL;
int i;
if_header = xmalloc(strlen(lock->token) + 25);
sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
dav_headers = curl_slist_append(dav_headers, if_header);
out_buffer.size = 41;
out_data = xmalloc(out_buffer.size + 1);
i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
if (i != out_buffer.size) {
fprintf(stderr, "Unable to initialize PUT request body\n");
return 0;
}
out_buffer.posn = 0;
out_buffer.buffer = out_data;
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
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);
if (start_active_slot(slot)) {
run_active_slot(slot);
free(out_data);
free(if_header);
if (slot->curl_result != CURLE_OK) {
fprintf(stderr,
"PUT error: curl result=%d, HTTP code=%ld\n",
slot->curl_result, slot->http_code);
/* We should attempt recovery? */
return 0;
}
} else {
free(out_data);
free(if_header);
fprintf(stderr, "Unable to start PUT request\n");
return 0;
}
return 1;
}
int main(int argc, char **argv)
{
struct transfer_request *request;
struct transfer_request *next_request;
int nr_refspec = 0;
char **refspec = NULL;
int do_remote_update;
int new_branch;
int force_this;
char *local_ref;
unsigned char local_sha1[20];
struct object *local_object = NULL;
char *remote_ref = NULL;
unsigned char remote_sha1[20];
struct active_lock *remote_lock;
char *remote_path = NULL;
int rc = 0;
int i;
setup_ident();
remote = xmalloc(sizeof(*remote));
remote->url = NULL;
remote->packs = NULL;
argv++;
for (i = 1; i < argc; i++, argv++) {
char *arg = *argv;
if (*arg == '-') {
if (!strcmp(arg, "--complete")) {
push_all = 1;
continue;
}
if (!strcmp(arg, "--force")) {
force_all = 1;
continue;
}
if (!strcmp(arg, "--verbose")) {
push_verbosely = 1;
continue;
}
usage(http_push_usage);
}
if (!remote->url) {
remote->url = arg;
continue;
}
refspec = argv;
nr_refspec = argc - i;
break;
}
memset(remote_dir_exists, 0, 256);
http_init();
no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
default_headers = curl_slist_append(default_headers, "Range:");
default_headers = curl_slist_append(default_headers, "Destination:");
default_headers = curl_slist_append(default_headers, "If:");
default_headers = curl_slist_append(default_headers,
"Pragma: no-cache");
/* Verify DAV compliance/lock support */
if (!locking_available()) {
fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
rc = 1;
goto cleanup;
}
/* Process each refspec */
for (i = 0; i < nr_refspec; i++) {
char *ep;
force_this = 0;
do_remote_update = 0;
new_branch = 0;
local_ref = refspec[i];
if (*local_ref == '+') {
force_this = 1;
local_ref++;
}
ep = strchr(local_ref, ':');
if (ep) {
remote_ref = ep + 1;
*ep = 0;
}
else
remote_ref = local_ref;
/* Lock remote branch ref */
if (remote_path)
free(remote_path);
remote_path = xmalloc(strlen(remote_ref) + 12);
sprintf(remote_path, "refs/heads/%s", remote_ref);
remote_lock = lock_remote(remote_path, LOCK_TIME);
if (remote_lock == NULL) {
fprintf(stderr, "Unable to lock remote branch %s\n",
remote_ref);
rc = 1;
continue;
}
/* Resolve local and remote refs */
if (fetch_ref(remote_ref, remote_sha1) != 0) {
fprintf(stderr,
"Remote branch %s does not exist on %s\n",
remote_ref, remote->url);
new_branch = 1;
}
if (get_sha1(local_ref, local_sha1) != 0) {
fprintf(stderr, "Error resolving local branch %s\n",
local_ref);
rc = 1;
goto unlock;
}
/* Find relationship between local and remote */
local_object = parse_object(local_sha1);
if (!local_object) {
fprintf(stderr, "Unable to parse local object %s\n",
sha1_to_hex(local_sha1));
rc = 1;
goto unlock;
} else if (new_branch) {
do_remote_update = 1;
} else {
if (!memcmp(local_sha1, remote_sha1, 20)) {
fprintf(stderr,
"* %s: same as branch '%s' of %s\n",
local_ref, remote_ref, remote->url);
} else if (is_ancestor(remote_sha1,
(struct commit *)local_object)) {
fprintf(stderr,
"Remote %s will fast-forward to local %s\n",
remote_ref, local_ref);
do_remote_update = 1;
} else if (force_all || force_this) {
fprintf(stderr,
"* %s on %s does not fast forward to local branch '%s', overwriting\n",
remote_ref, remote->url, local_ref);
do_remote_update = 1;
} else {
fprintf(stderr,
"* %s on %s does not fast forward to local branch '%s'\n",
remote_ref, remote->url, local_ref);
rc = 1;
goto unlock;
}
}
/* Generate and check list of required objects */
pushing = 0;
if (do_remote_update || push_all)
fetch_indices();
get_delta(push_all ? NULL : remote_sha1,
local_object, remote_lock);
finish_all_active_slots();
/* Push missing objects to remote, this would be a
convenient time to pack them first if appropriate. */
pushing = 1;
fill_active_slots();
finish_all_active_slots();
/* Update the remote branch if all went well */
if (do_remote_update) {
if (!aborted && update_remote(local_sha1,
remote_lock)) {
fprintf(stderr, "%s remote branch %s\n",
new_branch ? "Created" : "Updated",
remote_ref);
} else {
fprintf(stderr,
"Unable to %s remote branch %s\n",
new_branch ? "create" : "update",
remote_ref);
rc = 1;
goto unlock;
}
}
unlock:
unlock_remote(remote_lock);
free(remote_path);
}
cleanup:
free(remote);
curl_slist_free_all(no_pragma_header);
curl_slist_free_all(default_headers);
http_cleanup();
request = request_queue_head;
while (request != NULL) {
next_request = request->next;
release_request(request);
request = next_request;
}
return rc;
}