git-commit-vandalism/remote-curl.c
brian m. carlson 6f1194246a remote-curl: pass on atomic capability to remote side
When pushing more than one reference with the --atomic option, the
server is supposed to perform a single atomic transaction to update the
references, leaving them either all to succeed or all to fail.  This
works fine when pushing locally or over SSH, but when pushing over HTTP,
we fail to pass the atomic capability to the remote side.  In fact, we
have not reported this capability to any remote helpers during the life
of the feature.

Now normally, things happen to work nevertheless, since we actually
check for most types of failures, such as non-fast-forward updates, on
the client side, and just abort the entire attempt.  However, if the
server side reports a problem, such as the inability to lock a ref, the
transaction isn't atomic, because we haven't passed the appropriate
capability over and the remote side has no way of knowing that we wanted
atomic behavior.

Fix this by passing the option from the transport code through to remote
helpers, and from the HTTP remote helper down to send-pack.  With this
change, we can detect if the server side rejects the push and report
back appropriately.  Note the difference in the messages: the remote
side reports "atomic transaction failed", while our own checking rejects
pushes with the message "atomic push failed".

Document the atomic option in the remote helper documentation, so other
implementers can implement it if they like.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-17 16:08:22 +09:00

1460 lines
37 KiB
C

#include "cache.h"
#include "config.h"
#include "remote.h"
#include "connect.h"
#include "strbuf.h"
#include "walker.h"
#include "http.h"
#include "exec-cmd.h"
#include "run-command.h"
#include "pkt-line.h"
#include "string-list.h"
#include "sideband.h"
#include "argv-array.h"
#include "credential.h"
#include "sha1-array.h"
#include "send-pack.h"
#include "protocol.h"
#include "quote.h"
#include "transport.h"
static struct remote *remote;
/* always ends with a trailing slash */
static struct strbuf url = STRBUF_INIT;
struct options {
int verbosity;
unsigned long depth;
char *deepen_since;
struct string_list deepen_not;
struct string_list push_options;
char *filter;
unsigned progress : 1,
check_self_contained_and_connected : 1,
cloning : 1,
update_shallow : 1,
followtags : 1,
dry_run : 1,
thin : 1,
/* One of the SEND_PACK_PUSH_CERT_* constants. */
push_cert : 2,
deepen_relative : 1,
from_promisor : 1,
no_dependents : 1,
atomic : 1;
};
static struct options options;
static struct string_list cas_options = STRING_LIST_INIT_DUP;
static int set_option(const char *name, const char *value)
{
if (!strcmp(name, "verbosity")) {
char *end;
int v = strtol(value, &end, 10);
if (value == end || *end)
return -1;
options.verbosity = v;
return 0;
}
else if (!strcmp(name, "progress")) {
if (!strcmp(value, "true"))
options.progress = 1;
else if (!strcmp(value, "false"))
options.progress = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "depth")) {
char *end;
unsigned long v = strtoul(value, &end, 10);
if (value == end || *end)
return -1;
options.depth = v;
return 0;
}
else if (!strcmp(name, "deepen-since")) {
options.deepen_since = xstrdup(value);
return 0;
}
else if (!strcmp(name, "deepen-not")) {
string_list_append(&options.deepen_not, value);
return 0;
}
else if (!strcmp(name, "deepen-relative")) {
if (!strcmp(value, "true"))
options.deepen_relative = 1;
else if (!strcmp(value, "false"))
options.deepen_relative = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "followtags")) {
if (!strcmp(value, "true"))
options.followtags = 1;
else if (!strcmp(value, "false"))
options.followtags = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "dry-run")) {
if (!strcmp(value, "true"))
options.dry_run = 1;
else if (!strcmp(value, "false"))
options.dry_run = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "check-connectivity")) {
if (!strcmp(value, "true"))
options.check_self_contained_and_connected = 1;
else if (!strcmp(value, "false"))
options.check_self_contained_and_connected = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "cas")) {
struct strbuf val = STRBUF_INIT;
strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
string_list_append(&cas_options, val.buf);
strbuf_release(&val);
return 0;
} else if (!strcmp(name, "cloning")) {
if (!strcmp(value, "true"))
options.cloning = 1;
else if (!strcmp(value, "false"))
options.cloning = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "update-shallow")) {
if (!strcmp(value, "true"))
options.update_shallow = 1;
else if (!strcmp(value, "false"))
options.update_shallow = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "pushcert")) {
if (!strcmp(value, "true"))
options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
else if (!strcmp(value, "false"))
options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
else if (!strcmp(value, "if-asked"))
options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
else
return -1;
return 0;
} else if (!strcmp(name, "atomic")) {
if (!strcmp(value, "true"))
options.atomic = 1;
else if (!strcmp(value, "false"))
options.atomic = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "push-option")) {
if (*value != '"')
string_list_append(&options.push_options, value);
else {
struct strbuf unquoted = STRBUF_INIT;
if (unquote_c_style(&unquoted, value, NULL) < 0)
die(_("invalid quoting in push-option value: '%s'"), value);
string_list_append_nodup(&options.push_options,
strbuf_detach(&unquoted, NULL));
}
return 0;
#if LIBCURL_VERSION_NUM >= 0x070a08
} else if (!strcmp(name, "family")) {
if (!strcmp(value, "ipv4"))
git_curl_ipresolve = CURL_IPRESOLVE_V4;
else if (!strcmp(value, "ipv6"))
git_curl_ipresolve = CURL_IPRESOLVE_V6;
else if (!strcmp(value, "all"))
git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
else
return -1;
return 0;
#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
} else if (!strcmp(name, "from-promisor")) {
options.from_promisor = 1;
return 0;
} else if (!strcmp(name, "no-dependents")) {
options.no_dependents = 1;
return 0;
} else if (!strcmp(name, "filter")) {
options.filter = xstrdup(value);
return 0;
} else {
return 1 /* unsupported */;
}
}
struct discovery {
char *service;
char *buf_alloc;
char *buf;
size_t len;
struct ref *refs;
struct oid_array shallow;
enum protocol_version version;
unsigned proto_git : 1;
};
static struct discovery *last_discovery;
static struct ref *parse_git_refs(struct discovery *heads, int for_push)
{
struct ref *list = NULL;
struct packet_reader reader;
packet_reader_init(&reader, -1, heads->buf, heads->len,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_GENTLE_ON_EOF |
PACKET_READ_DIE_ON_ERR_PACKET);
heads->version = discover_version(&reader);
switch (heads->version) {
case protocol_v2:
/*
* Do nothing. This isn't a list of refs but rather a
* capability advertisement. Client would have run
* 'stateless-connect' so we'll dump this capability listing
* and let them request the refs themselves.
*/
break;
case protocol_v1:
case protocol_v0:
get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
NULL, &heads->shallow);
break;
case protocol_unknown_version:
BUG("unknown protocol version");
}
return list;
}
static struct ref *parse_info_refs(struct discovery *heads)
{
char *data, *start, *mid;
char *ref_name;
int i = 0;
struct ref *refs = NULL;
struct ref *ref = NULL;
struct ref *last_ref = NULL;
data = heads->buf;
start = NULL;
mid = data;
while (i < heads->len) {
if (!start) {
start = &data[i];
}
if (data[i] == '\t')
mid = &data[i];
if (data[i] == '\n') {
if (mid - start != the_hash_algo->hexsz)
die(_("%sinfo/refs not valid: is this a git repository?"),
transport_anonymize_url(url.buf));
data[i] = 0;
ref_name = mid + 1;
ref = alloc_ref(ref_name);
get_oid_hex(start, &ref->old_oid);
if (!refs)
refs = ref;
if (last_ref)
last_ref->next = ref;
last_ref = ref;
start = NULL;
}
i++;
}
ref = alloc_ref("HEAD");
if (!http_fetch_ref(url.buf, ref) &&
!resolve_remote_symref(ref, refs)) {
ref->next = refs;
refs = ref;
} else {
free(ref);
}
return refs;
}
static void free_discovery(struct discovery *d)
{
if (d) {
if (d == last_discovery)
last_discovery = NULL;
free(d->shallow.oid);
free(d->buf_alloc);
free_refs(d->refs);
free(d->service);
free(d);
}
}
static int show_http_message(struct strbuf *type, struct strbuf *charset,
struct strbuf *msg)
{
const char *p, *eol;
/*
* We only show text/plain parts, as other types are likely
* to be ugly to look at on the user's terminal.
*/
if (strcmp(type->buf, "text/plain"))
return -1;
if (charset->len)
strbuf_reencode(msg, charset->buf, get_log_output_encoding());
strbuf_trim(msg);
if (!msg->len)
return -1;
p = msg->buf;
do {
eol = strchrnul(p, '\n');
fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
p = eol + 1;
} while(*eol);
return 0;
}
static int get_protocol_http_header(enum protocol_version version,
struct strbuf *header)
{
if (version > 0) {
strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
version);
return 1;
}
return 0;
}
static void check_smart_http(struct discovery *d, const char *service,
struct strbuf *type)
{
const char *p;
struct packet_reader reader;
/*
* If we don't see x-$service-advertisement, then it's not smart-http.
* But once we do, we commit to it and assume any other protocol
* violations are hard errors.
*/
if (!skip_prefix(type->buf, "application/x-", &p) ||
!skip_prefix(p, service, &p) ||
strcmp(p, "-advertisement"))
return;
packet_reader_init(&reader, -1, d->buf, d->len,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_DIE_ON_ERR_PACKET);
if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
die(_("invalid server response; expected service, got flush packet"));
if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
/*
* The header can include additional metadata lines, up
* until a packet flush marker. Ignore these now, but
* in the future we might start to scan them.
*/
for (;;) {
packet_reader_read(&reader);
if (reader.pktlen <= 0) {
break;
}
}
/*
* v0 smart http; callers expect us to soak up the
* service and header packets
*/
d->buf = reader.src_buffer;
d->len = reader.src_len;
d->proto_git = 1;
} else if (!strcmp(reader.line, "version 2")) {
/*
* v2 smart http; do not consume version packet, which will
* be handled elsewhere.
*/
d->proto_git = 1;
} else {
die(_("invalid server response; got '%s'"), reader.line);
}
}
static struct discovery *discover_refs(const char *service, int for_push)
{
struct strbuf type = STRBUF_INIT;
struct strbuf charset = STRBUF_INIT;
struct strbuf buffer = STRBUF_INIT;
struct strbuf refs_url = STRBUF_INIT;
struct strbuf effective_url = STRBUF_INIT;
struct strbuf protocol_header = STRBUF_INIT;
struct string_list extra_headers = STRING_LIST_INIT_DUP;
struct discovery *last = last_discovery;
int http_ret, maybe_smart = 0;
struct http_get_options http_options;
enum protocol_version version = get_protocol_version_config();
if (last && !strcmp(service, last->service))
return last;
free_discovery(last);
strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
git_env_bool("GIT_SMART_HTTP", 1)) {
maybe_smart = 1;
if (!strchr(url.buf, '?'))
strbuf_addch(&refs_url, '?');
else
strbuf_addch(&refs_url, '&');
strbuf_addf(&refs_url, "service=%s", service);
}
/*
* NEEDSWORK: If we are trying to use protocol v2 and we are planning
* to perform a push, then fallback to v0 since the client doesn't know
* how to push yet using v2.
*/
if (version == protocol_v2 && !strcmp("git-receive-pack", service))
version = protocol_v0;
/* Add the extra Git-Protocol header */
if (get_protocol_http_header(version, &protocol_header))
string_list_append(&extra_headers, protocol_header.buf);
memset(&http_options, 0, sizeof(http_options));
http_options.content_type = &type;
http_options.charset = &charset;
http_options.effective_url = &effective_url;
http_options.base_url = &url;
http_options.extra_headers = &extra_headers;
http_options.initial_request = 1;
http_options.no_cache = 1;
http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
switch (http_ret) {
case HTTP_OK:
break;
case HTTP_MISSING_TARGET:
show_http_message(&type, &charset, &buffer);
die(_("repository '%s' not found"),
transport_anonymize_url(url.buf));
case HTTP_NOAUTH:
show_http_message(&type, &charset, &buffer);
die(_("Authentication failed for '%s'"),
transport_anonymize_url(url.buf));
default:
show_http_message(&type, &charset, &buffer);
die(_("unable to access '%s': %s"),
transport_anonymize_url(url.buf), curl_errorstr);
}
if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
char *u = transport_anonymize_url(url.buf);
warning(_("redirecting to %s"), u);
free(u);
}
last= xcalloc(1, sizeof(*last_discovery));
last->service = xstrdup(service);
last->buf_alloc = strbuf_detach(&buffer, &last->len);
last->buf = last->buf_alloc;
if (maybe_smart)
check_smart_http(last, service, &type);
if (last->proto_git)
last->refs = parse_git_refs(last, for_push);
else
last->refs = parse_info_refs(last);
strbuf_release(&refs_url);
strbuf_release(&type);
strbuf_release(&charset);
strbuf_release(&effective_url);
strbuf_release(&buffer);
strbuf_release(&protocol_header);
string_list_clear(&extra_headers, 0);
last_discovery = last;
return last;
}
static struct ref *get_refs(int for_push)
{
struct discovery *heads;
if (for_push)
heads = discover_refs("git-receive-pack", for_push);
else
heads = discover_refs("git-upload-pack", for_push);
return heads->refs;
}
static void output_refs(struct ref *refs)
{
struct ref *posn;
for (posn = refs; posn; posn = posn->next) {
if (posn->symref)
printf("@%s %s\n", posn->symref, posn->name);
else
printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
}
printf("\n");
fflush(stdout);
}
struct rpc_state {
const char *service_name;
char *service_url;
char *hdr_content_type;
char *hdr_accept;
char *protocol_header;
char *buf;
size_t alloc;
size_t len;
size_t pos;
int in;
int out;
int any_written;
unsigned gzip_request : 1;
unsigned initial_buffer : 1;
/*
* Whenever a pkt-line is read into buf, append the 4 characters
* denoting its length before appending the payload.
*/
unsigned write_line_lengths : 1;
/*
* Used by rpc_out; initialize to 0. This is true if a flush has been
* read, but the corresponding line length (if write_line_lengths is
* true) and EOF have not been sent to libcurl. Since each flush marks
* the end of a request, each flush must be completely sent before any
* further reading occurs.
*/
unsigned flush_read_but_not_sent : 1;
};
/*
* Appends the result of reading from rpc->out to the string represented by
* rpc->buf and rpc->len if there is enough space. Returns 1 if there was
* enough space, 0 otherwise.
*
* If rpc->write_line_lengths is true, appends the line length as a 4-byte
* hexadecimal string before appending the result described above.
*
* Writes the total number of bytes appended into appended.
*/
static int rpc_read_from_out(struct rpc_state *rpc, int options,
size_t *appended,
enum packet_read_status *status) {
size_t left;
char *buf;
int pktlen_raw;
if (rpc->write_line_lengths) {
left = rpc->alloc - rpc->len - 4;
buf = rpc->buf + rpc->len + 4;
} else {
left = rpc->alloc - rpc->len;
buf = rpc->buf + rpc->len;
}
if (left < LARGE_PACKET_MAX)
return 0;
*status = packet_read_with_status(rpc->out, NULL, NULL, buf,
left, &pktlen_raw, options);
if (*status != PACKET_READ_EOF) {
*appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
rpc->len += *appended;
}
if (rpc->write_line_lengths) {
switch (*status) {
case PACKET_READ_EOF:
if (!(options & PACKET_READ_GENTLE_ON_EOF))
die(_("shouldn't have EOF when not gentle on EOF"));
break;
case PACKET_READ_NORMAL:
set_packet_header(buf - 4, *appended);
break;
case PACKET_READ_DELIM:
memcpy(buf - 4, "0001", 4);
break;
case PACKET_READ_FLUSH:
memcpy(buf - 4, "0000", 4);
break;
}
}
return 1;
}
static size_t rpc_out(void *ptr, size_t eltsize,
size_t nmemb, void *buffer_)
{
size_t max = eltsize * nmemb;
struct rpc_state *rpc = buffer_;
size_t avail = rpc->len - rpc->pos;
enum packet_read_status status;
if (!avail) {
rpc->initial_buffer = 0;
rpc->len = 0;
rpc->pos = 0;
if (!rpc->flush_read_but_not_sent) {
if (!rpc_read_from_out(rpc, 0, &avail, &status))
BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
if (status == PACKET_READ_FLUSH)
rpc->flush_read_but_not_sent = 1;
}
/*
* If flush_read_but_not_sent is true, we have already read one
* full request but have not fully sent it + EOF, which is why
* we need to refrain from reading.
*/
}
if (rpc->flush_read_but_not_sent) {
if (!avail) {
/*
* The line length either does not need to be sent at
* all or has already been completely sent. Now we can
* return 0, indicating EOF, meaning that the flush has
* been fully sent.
*/
rpc->flush_read_but_not_sent = 0;
return 0;
}
/*
* If avail is non-zerp, the line length for the flush still
* hasn't been fully sent. Proceed with sending the line
* length.
*/
}
if (max < avail)
avail = max;
memcpy(ptr, rpc->buf + rpc->pos, avail);
rpc->pos += avail;
return avail;
}
#ifndef NO_CURL_IOCTL
static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
{
struct rpc_state *rpc = clientp;
switch (cmd) {
case CURLIOCMD_NOP:
return CURLIOE_OK;
case CURLIOCMD_RESTARTREAD:
if (rpc->initial_buffer) {
rpc->pos = 0;
return CURLIOE_OK;
}
error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
return CURLIOE_FAILRESTART;
default:
return CURLIOE_UNKNOWNCMD;
}
}
#endif
struct rpc_in_data {
struct rpc_state *rpc;
struct active_request_slot *slot;
};
/*
* A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
* from ptr.
*/
static size_t rpc_in(char *ptr, size_t eltsize,
size_t nmemb, void *buffer_)
{
size_t size = eltsize * nmemb;
struct rpc_in_data *data = buffer_;
long response_code;
if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
&response_code) != CURLE_OK)
return size;
if (response_code >= 300)
return size;
if (size)
data->rpc->any_written = 1;
write_or_die(data->rpc->in, ptr, size);
return size;
}
static int run_slot(struct active_request_slot *slot,
struct slot_results *results)
{
int err;
struct slot_results results_buf;
if (!results)
results = &results_buf;
err = run_one_slot(slot, results);
if (err != HTTP_OK && err != HTTP_REAUTH) {
struct strbuf msg = STRBUF_INIT;
if (results->http_code && results->http_code != 200)
strbuf_addf(&msg, "HTTP %ld", results->http_code);
if (results->curl_result != CURLE_OK) {
if (msg.len)
strbuf_addch(&msg, ' ');
strbuf_addf(&msg, "curl %d", results->curl_result);
if (curl_errorstr[0]) {
strbuf_addch(&msg, ' ');
strbuf_addstr(&msg, curl_errorstr);
}
}
error(_("RPC failed; %s"), msg.buf);
strbuf_release(&msg);
}
return err;
}
static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
{
struct active_request_slot *slot;
struct curl_slist *headers = http_copy_default_headers();
struct strbuf buf = STRBUF_INIT;
int err;
slot = get_active_slot();
headers = curl_slist_append(headers, rpc->hdr_content_type);
headers = curl_slist_append(headers, rpc->hdr_accept);
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
err = run_slot(slot, results);
curl_slist_free_all(headers);
strbuf_release(&buf);
return err;
}
static curl_off_t xcurl_off_t(size_t len)
{
uintmax_t size = len;
if (size > maximum_signed_value_of_type(curl_off_t))
die(_("cannot handle pushes this big"));
return (curl_off_t)size;
}
/*
* If flush_received is true, do not attempt to read any more; just use what's
* in rpc->buf.
*/
static int post_rpc(struct rpc_state *rpc, int flush_received)
{
struct active_request_slot *slot;
struct curl_slist *headers = http_copy_default_headers();
int use_gzip = rpc->gzip_request;
char *gzip_body = NULL;
size_t gzip_size = 0;
int err, large_request = 0;
int needs_100_continue = 0;
struct rpc_in_data rpc_in_data;
/* Try to load the entire request, if we can fit it into the
* allocated buffer space we can use HTTP/1.0 and avoid the
* chunked encoding mess.
*/
if (!flush_received) {
while (1) {
size_t n;
enum packet_read_status status;
if (!rpc_read_from_out(rpc, 0, &n, &status)) {
large_request = 1;
use_gzip = 0;
break;
}
if (status == PACKET_READ_FLUSH)
break;
}
}
if (large_request) {
struct slot_results results;
do {
err = probe_rpc(rpc, &results);
if (err == HTTP_REAUTH)
credential_fill(&http_auth);
} while (err == HTTP_REAUTH);
if (err != HTTP_OK)
return -1;
if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
needs_100_continue = 1;
}
headers = curl_slist_append(headers, rpc->hdr_content_type);
headers = curl_slist_append(headers, rpc->hdr_accept);
headers = curl_slist_append(headers, needs_100_continue ?
"Expect: 100-continue" : "Expect:");
/* Add the extra Git-Protocol header */
if (rpc->protocol_header)
headers = curl_slist_append(headers, rpc->protocol_header);
retry:
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
if (large_request) {
/* The request body is large and the size cannot be predicted.
* We must use chunked encoding to send it.
*/
headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
rpc->initial_buffer = 1;
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
#ifndef NO_CURL_IOCTL
curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
#endif
if (options.verbosity > 1) {
fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
fflush(stderr);
}
} else if (gzip_body) {
/*
* If we are looping to retry authentication, then the previous
* run will have set up the headers and gzip buffer already,
* and we just need to send it.
*/
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
} else if (use_gzip && 1024 < rpc->len) {
/* The client backend isn't giving us compressed data so
* we can try to deflate it ourselves, this may save on
* the transfer time.
*/
git_zstream stream;
int ret;
git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
gzip_size = git_deflate_bound(&stream, rpc->len);
gzip_body = xmalloc(gzip_size);
stream.next_in = (unsigned char *)rpc->buf;
stream.avail_in = rpc->len;
stream.next_out = (unsigned char *)gzip_body;
stream.avail_out = gzip_size;
ret = git_deflate(&stream, Z_FINISH);
if (ret != Z_STREAM_END)
die(_("cannot deflate request; zlib deflate error %d"), ret);
ret = git_deflate_end_gently(&stream);
if (ret != Z_OK)
die(_("cannot deflate request; zlib end error %d"), ret);
gzip_size = stream.total_out;
headers = curl_slist_append(headers, "Content-Encoding: gzip");
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
if (options.verbosity > 1) {
fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
rpc->service_name,
(unsigned long)rpc->len, (unsigned long)gzip_size);
fflush(stderr);
}
} else {
/* We know the complete request size in advance, use the
* more normal Content-Length approach.
*/
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
if (options.verbosity > 1) {
fprintf(stderr, "POST %s (%lu bytes)\n",
rpc->service_name, (unsigned long)rpc->len);
fflush(stderr);
}
}
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
rpc_in_data.rpc = rpc;
rpc_in_data.slot = slot;
curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
rpc->any_written = 0;
err = run_slot(slot, NULL);
if (err == HTTP_REAUTH && !large_request) {
credential_fill(&http_auth);
goto retry;
}
if (err != HTTP_OK)
err = -1;
if (!rpc->any_written)
err = -1;
curl_slist_free_all(headers);
free(gzip_body);
return err;
}
static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
const char **client_argv, const struct strbuf *preamble,
struct strbuf *rpc_result)
{
const char *svc = rpc->service_name;
struct strbuf buf = STRBUF_INIT;
struct child_process client = CHILD_PROCESS_INIT;
int err = 0;
client.in = -1;
client.out = -1;
client.git_cmd = 1;
client.argv = client_argv;
if (start_command(&client))
exit(1);
write_or_die(client.in, preamble->buf, preamble->len);
if (heads)
write_or_die(client.in, heads->buf, heads->len);
rpc->alloc = http_post_buffer;
rpc->buf = xmalloc(rpc->alloc);
rpc->in = client.in;
rpc->out = client.out;
strbuf_addf(&buf, "%s%s", url.buf, svc);
rpc->service_url = strbuf_detach(&buf, NULL);
strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
rpc->hdr_content_type = strbuf_detach(&buf, NULL);
strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
rpc->hdr_accept = strbuf_detach(&buf, NULL);
if (get_protocol_http_header(heads->version, &buf))
rpc->protocol_header = strbuf_detach(&buf, NULL);
else
rpc->protocol_header = NULL;
while (!err) {
int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
if (!n)
break;
rpc->pos = 0;
rpc->len = n;
err |= post_rpc(rpc, 0);
}
close(client.in);
client.in = -1;
if (!err) {
strbuf_read(rpc_result, client.out, 0);
} else {
char buf[4096];
for (;;)
if (xread(client.out, buf, sizeof(buf)) <= 0)
break;
}
close(client.out);
client.out = -1;
err |= finish_command(&client);
free(rpc->service_url);
free(rpc->hdr_content_type);
free(rpc->hdr_accept);
free(rpc->protocol_header);
free(rpc->buf);
strbuf_release(&buf);
return err;
}
static int fetch_dumb(int nr_heads, struct ref **to_fetch)
{
struct walker *walker;
char **targets;
int ret, i;
ALLOC_ARRAY(targets, nr_heads);
if (options.depth || options.deepen_since)
die(_("dumb http transport does not support shallow capabilities"));
for (i = 0; i < nr_heads; i++)
targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
walker = get_http_walker(url.buf);
walker->get_verbosely = options.verbosity >= 3;
walker->get_recover = 0;
ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
walker_free(walker);
for (i = 0; i < nr_heads; i++)
free(targets[i]);
free(targets);
return ret ? error(_("fetch failed.")) : 0;
}
static int fetch_git(struct discovery *heads,
int nr_heads, struct ref **to_fetch)
{
struct rpc_state rpc;
struct strbuf preamble = STRBUF_INIT;
int i, err;
struct argv_array args = ARGV_ARRAY_INIT;
struct strbuf rpc_result = STRBUF_INIT;
argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
"--stdin", "--lock-pack", NULL);
if (options.followtags)
argv_array_push(&args, "--include-tag");
if (options.thin)
argv_array_push(&args, "--thin");
if (options.verbosity >= 3)
argv_array_pushl(&args, "-v", "-v", NULL);
if (options.check_self_contained_and_connected)
argv_array_push(&args, "--check-self-contained-and-connected");
if (options.cloning)
argv_array_push(&args, "--cloning");
if (options.update_shallow)
argv_array_push(&args, "--update-shallow");
if (!options.progress)
argv_array_push(&args, "--no-progress");
if (options.depth)
argv_array_pushf(&args, "--depth=%lu", options.depth);
if (options.deepen_since)
argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
for (i = 0; i < options.deepen_not.nr; i++)
argv_array_pushf(&args, "--shallow-exclude=%s",
options.deepen_not.items[i].string);
if (options.deepen_relative && options.depth)
argv_array_push(&args, "--deepen-relative");
if (options.from_promisor)
argv_array_push(&args, "--from-promisor");
if (options.no_dependents)
argv_array_push(&args, "--no-dependents");
if (options.filter)
argv_array_pushf(&args, "--filter=%s", options.filter);
argv_array_push(&args, url.buf);
for (i = 0; i < nr_heads; i++) {
struct ref *ref = to_fetch[i];
if (!*ref->name)
die(_("cannot fetch by sha1 over smart http"));
packet_buf_write(&preamble, "%s %s\n",
oid_to_hex(&ref->old_oid), ref->name);
}
packet_buf_flush(&preamble);
memset(&rpc, 0, sizeof(rpc));
rpc.service_name = "git-upload-pack",
rpc.gzip_request = 1;
err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
if (rpc_result.len)
write_or_die(1, rpc_result.buf, rpc_result.len);
strbuf_release(&rpc_result);
strbuf_release(&preamble);
argv_array_clear(&args);
return err;
}
static int fetch(int nr_heads, struct ref **to_fetch)
{
struct discovery *d = discover_refs("git-upload-pack", 0);
if (d->proto_git)
return fetch_git(d, nr_heads, to_fetch);
else
return fetch_dumb(nr_heads, to_fetch);
}
static void parse_fetch(struct strbuf *buf)
{
struct ref **to_fetch = NULL;
struct ref *list_head = NULL;
struct ref **list = &list_head;
int alloc_heads = 0, nr_heads = 0;
do {
const char *p;
if (skip_prefix(buf->buf, "fetch ", &p)) {
const char *name;
struct ref *ref;
struct object_id old_oid;
const char *q;
if (parse_oid_hex(p, &old_oid, &q))
die(_("protocol error: expected sha/ref, got '%s'"), p);
if (*q == ' ')
name = q + 1;
else if (!*q)
name = "";
else
die(_("protocol error: expected sha/ref, got '%s'"), p);
ref = alloc_ref(name);
oidcpy(&ref->old_oid, &old_oid);
*list = ref;
list = &ref->next;
ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
to_fetch[nr_heads++] = ref;
}
else
die(_("http transport does not support %s"), buf->buf);
strbuf_reset(buf);
if (strbuf_getline_lf(buf, stdin) == EOF)
return;
if (!*buf->buf)
break;
} while (1);
if (fetch(nr_heads, to_fetch))
exit(128); /* error already reported */
free_refs(list_head);
free(to_fetch);
printf("\n");
fflush(stdout);
strbuf_reset(buf);
}
static int push_dav(int nr_spec, char **specs)
{
struct child_process child = CHILD_PROCESS_INIT;
size_t i;
child.git_cmd = 1;
argv_array_push(&child.args, "http-push");
argv_array_push(&child.args, "--helper-status");
if (options.dry_run)
argv_array_push(&child.args, "--dry-run");
if (options.verbosity > 1)
argv_array_push(&child.args, "--verbose");
argv_array_push(&child.args, url.buf);
for (i = 0; i < nr_spec; i++)
argv_array_push(&child.args, specs[i]);
if (run_command(&child))
die(_("git-http-push failed"));
return 0;
}
static int push_git(struct discovery *heads, int nr_spec, char **specs)
{
struct rpc_state rpc;
int i, err;
struct argv_array args;
struct string_list_item *cas_option;
struct strbuf preamble = STRBUF_INIT;
struct strbuf rpc_result = STRBUF_INIT;
argv_array_init(&args);
argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
NULL);
if (options.thin)
argv_array_push(&args, "--thin");
if (options.dry_run)
argv_array_push(&args, "--dry-run");
if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
argv_array_push(&args, "--signed=yes");
else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
argv_array_push(&args, "--signed=if-asked");
if (options.atomic)
argv_array_push(&args, "--atomic");
if (options.verbosity == 0)
argv_array_push(&args, "--quiet");
else if (options.verbosity > 1)
argv_array_push(&args, "--verbose");
for (i = 0; i < options.push_options.nr; i++)
argv_array_pushf(&args, "--push-option=%s",
options.push_options.items[i].string);
argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
for_each_string_list_item(cas_option, &cas_options)
argv_array_push(&args, cas_option->string);
argv_array_push(&args, url.buf);
argv_array_push(&args, "--stdin");
for (i = 0; i < nr_spec; i++)
packet_buf_write(&preamble, "%s\n", specs[i]);
packet_buf_flush(&preamble);
memset(&rpc, 0, sizeof(rpc));
rpc.service_name = "git-receive-pack",
err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
if (rpc_result.len)
write_or_die(1, rpc_result.buf, rpc_result.len);
strbuf_release(&rpc_result);
strbuf_release(&preamble);
argv_array_clear(&args);
return err;
}
static int push(int nr_spec, char **specs)
{
struct discovery *heads = discover_refs("git-receive-pack", 1);
int ret;
if (heads->proto_git)
ret = push_git(heads, nr_spec, specs);
else
ret = push_dav(nr_spec, specs);
free_discovery(heads);
return ret;
}
static void parse_push(struct strbuf *buf)
{
char **specs = NULL;
int alloc_spec = 0, nr_spec = 0, i, ret;
do {
if (starts_with(buf->buf, "push ")) {
ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
specs[nr_spec++] = xstrdup(buf->buf + 5);
}
else
die(_("http transport does not support %s"), buf->buf);
strbuf_reset(buf);
if (strbuf_getline_lf(buf, stdin) == EOF)
goto free_specs;
if (!*buf->buf)
break;
} while (1);
ret = push(nr_spec, specs);
printf("\n");
fflush(stdout);
if (ret)
exit(128); /* error already reported */
free_specs:
for (i = 0; i < nr_spec; i++)
free(specs[i]);
free(specs);
}
static int stateless_connect(const char *service_name)
{
struct discovery *discover;
struct rpc_state rpc;
struct strbuf buf = STRBUF_INIT;
/*
* Run the info/refs request and see if the server supports protocol
* v2. If and only if the server supports v2 can we successfully
* establish a stateless connection, otherwise we need to tell the
* client to fallback to using other transport helper functions to
* complete their request.
*/
discover = discover_refs(service_name, 0);
if (discover->version != protocol_v2) {
printf("fallback\n");
fflush(stdout);
return -1;
} else {
/* Stateless Connection established */
printf("\n");
fflush(stdout);
}
rpc.service_name = service_name;
rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
if (get_protocol_http_header(discover->version, &buf)) {
rpc.protocol_header = strbuf_detach(&buf, NULL);
} else {
rpc.protocol_header = NULL;
strbuf_release(&buf);
}
rpc.buf = xmalloc(http_post_buffer);
rpc.alloc = http_post_buffer;
rpc.len = 0;
rpc.pos = 0;
rpc.in = 1;
rpc.out = 0;
rpc.any_written = 0;
rpc.gzip_request = 1;
rpc.initial_buffer = 0;
rpc.write_line_lengths = 1;
rpc.flush_read_but_not_sent = 0;
/*
* Dump the capability listing that we got from the server earlier
* during the info/refs request.
*/
write_or_die(rpc.in, discover->buf, discover->len);
/* Until we see EOF keep sending POSTs */
while (1) {
size_t avail;
enum packet_read_status status;
if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
&status))
BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
if (status == PACKET_READ_EOF)
break;
if (post_rpc(&rpc, status == PACKET_READ_FLUSH))
/* We would have an err here */
break;
/* Reset the buffer for next request */
rpc.len = 0;
}
free(rpc.service_url);
free(rpc.hdr_content_type);
free(rpc.hdr_accept);
free(rpc.protocol_header);
free(rpc.buf);
strbuf_release(&buf);
return 0;
}
int cmd_main(int argc, const char **argv)
{
struct strbuf buf = STRBUF_INIT;
int nongit;
setup_git_directory_gently(&nongit);
if (argc < 2) {
error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
return 1;
}
options.verbosity = 1;
options.progress = !!isatty(2);
options.thin = 1;
string_list_init(&options.deepen_not, 1);
string_list_init(&options.push_options, 1);
/*
* Just report "remote-curl" here (folding all the various aliases
* ("git-remote-http", "git-remote-https", and etc.) here since they
* are all just copies of the same actual executable.
*/
trace2_cmd_name("remote-curl");
remote = remote_get(argv[1]);
if (argc > 2) {
end_url_with_slash(&url, argv[2]);
} else {
end_url_with_slash(&url, remote->url[0]);
}
http_init(remote, url.buf, 0);
do {
const char *arg;
if (strbuf_getline_lf(&buf, stdin) == EOF) {
if (ferror(stdin))
error(_("remote-curl: error reading command stream from git"));
return 1;
}
if (buf.len == 0)
break;
if (starts_with(buf.buf, "fetch ")) {
if (nongit)
die(_("remote-curl: fetch attempted without a local repo"));
parse_fetch(&buf);
} else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
int for_push = !!strstr(buf.buf + 4, "for-push");
output_refs(get_refs(for_push));
} else if (starts_with(buf.buf, "push ")) {
parse_push(&buf);
} else if (skip_prefix(buf.buf, "option ", &arg)) {
char *value = strchr(arg, ' ');
int result;
if (value)
*value++ = '\0';
else
value = "true";
result = set_option(arg, value);
if (!result)
printf("ok\n");
else if (result < 0)
printf("error invalid value\n");
else
printf("unsupported\n");
fflush(stdout);
} else if (!strcmp(buf.buf, "capabilities")) {
printf("stateless-connect\n");
printf("fetch\n");
printf("option\n");
printf("push\n");
printf("check-connectivity\n");
printf("\n");
fflush(stdout);
} else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
if (!stateless_connect(arg))
break;
} else {
error(_("remote-curl: unknown command '%s' from git"), buf.buf);
return 1;
}
strbuf_reset(&buf);
} while (1);
http_cleanup();
return 0;
}