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git/transport.c
Jeff King ae1a7eefff fetch-pack: signal v2 server that we are done making requests 
When fetching with the v0 protocol over ssh (or a local upload-pack with
pipes), the server closes the connection as soon as it is finished
sending the pack. So even though the client may still be operating on
the data via index-pack (e.g., resolving deltas, checking connectivity,
etc), the server has released all resources.

With the v2 protocol, however, the server considers the ssh session only
as a transport, with individual requests coming over it. After sending
the pack, it goes back to its main loop, waiting for another request to
come from the client. As a result, the ssh session hangs around until
the client process ends, which may be much later (because resolving
deltas, etc, may consume a lot of CPU).

This is bad for two reasons:

  - it's consuming resources on the server to leave open a connection
    that won't see any more use

  - if something bad happens to the ssh connection in the meantime (say,
    it gets killed by the network because it's idle, as happened in a
    real-world report), then ssh will exit non-zero, and we'll propagate
    the error up the stack.

The server is correct here not to hang up after serving the pack. The v2
protocol's design is meant to allow multiple requests like this, and
hanging up would be the wrong thing for a hypothetical client which was
planning to make more requests (though in practice, the git.git client
never would, and I doubt any other implementations would either).

The right thing is instead for the client to signal to the server that
it's not interested in making more requests. We can do that by closing
the pipe descriptor we use to write to ssh. This will propagate to the
server upload-pack as an EOF when it tries to read the next request (and
then it will close its half, and the whole connection will go away).

It's important to do this "half duplex" shutdown, because we have to do
it _before_ we actually receive the pack. This is an artifact of the way
fetch-pack and index-pack (or unpack-objects) interact. We hand the
connection off to index-pack (really, a sideband demuxer which feeds
it), and then wait until it returns. And it doesn't do that until it has
resolved all of the deltas in the pack, even though it was done reading
from the server long before.

So just closing the connection fully after index-pack returns would be
too late; we'd have held it open much longer than was necessary. And
teaching index-pack to close the connection is awkward. It's not even
seeing the whole conversation (the sideband demuxer is, but it doesn't
actually know what's in the packets, or when the end comes).

Note that this close() is happening deep within the transport code. It's
possible that a caller would want to perform other operations over the
same ssh transport after receiving the pack. But as of the current code,
none of the callers do, and there haven't been discussions of any plans
to change this. If we need to support that later, we can probably do so
by passing down a flag for "you're the last request on the transport;
it's OK to close" instead of the code just assuming that's true.

The description above all discusses v2 ssh, so it's worth thinking about
how this interacts with other protocols:

  - in v0 protocols, we could do the same half-duplex shutdown (it just
    goes into the v0 do_fetch_pack() instead). This does work, but since
    it doesn't have the same persistence problem in the first place,
    there's little reason to change it at this point.

  - local fetches against git-upload-pack on the same machine will
    behave the same as ssh (they are talking over two pipes, and see EOF
    on their input pipe)

  - fetches against git-daemon will run this same code, and close one of
    the descriptors. In practice, this won't do anything, since there
    our two descriptors are dups of each other, and not part of a
    half-duplex pair. The right thing would probably be to call
    shutdown(SHUT_WR) on it. I didn't bother with that here. It doesn't
    face the same error-code problem (since it's just a TCP connection),
    so it's really only an optimization problem. And git:// is not that
    widely used these days, and has less impact on server resources than
    an ssh termination.

  - v2 http doesn't suffer from this problem in the first place, as our
    pipes terminate at a local git-remote-https, which is passing data
    along as individual requests via curl. Probably curl is keeping the
    TCP/TLS connection open for more requests, and we might be able to
    tell it manually "hey, we are done making requests now". But I think
    that's much less important. It again doesn't suffer from the
    error-code problem, and HTTP keepalive is pretty well understood
    (importantly, the timeouts can be set low, because clients like curl
    know how to reconnect for subsequent requests if necessary). So it's
    probably not worth figuring out how to tell curl that we're done
    (though if we do, this patch is probably the first step anyway;
    fetch-pack closes the pipe back to remote-https, which would be the
    signal that it should tell curl we're done).

The code is pretty straightforward. We close the pipe at the right
moment, and set it to -1 to mark it as invalid. I modified the later
cleanup code to avoid calling close(-1). That's not strictly necessary,
since close(-1) is a noop, but hopefully makes things a bit more obvious
to a reader.

I suspect that trying to call more transport functions after the close()
(e.g., calling transport_fetch_refs() again) would fail, as it's not
smart enough to realize we need to re-open the ssh connection. But
that's already true when v0 is in use. And no current callers want to do
that (and again, the solution is probably a flag in the transport code
to keep things open, which can be added later).

There's no test here, as the situation it covers is inherently racy (the
question is when upload-pack exits, compared to when index-pack finishes
resolving deltas and exits). The rather gross shell snippet below does
recreate the problematic situation; when run on a sufficiently-large
repository (git.git works fine), it kills an "idle" upload-pack while
the client is resolving deltas, leading to a failed clone.

    (
	    git clone --no-local --progress . foo.git 2>&1
	    echo >&2 "clone exit code=$?"
    ) |
    tr '\r' '\n' |
    while read line
    do
	    case "$done,$line" in
	    ,Resolving*)
		    echo "hit resolving deltas; killing upload-pack"
		    killall -9 git-upload-pack
		    done=t
		    ;;
	    esac
    done

Reported-by: Greg Pflaum <greg.pflaum@pnp-hcl.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-20 07:38:40 +09:00

1532 lines
40 KiB
C
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#include "cache.h"
#include "config.h"
#include "transport.h"
#include "run-command.h"
#include "pkt-line.h"
#include "fetch-pack.h"
#include "remote.h"
#include "connect.h"
#include "send-pack.h"
#include "walker.h"
#include "bundle.h"
#include "dir.h"
#include "refs.h"
#include "refspec.h"
#include "branch.h"
#include "url.h"
#include "submodule.h"
#include "string-list.h"
#include "oid-array.h"
#include "sigchain.h"
#include "transport-internal.h"
#include "protocol.h"
#include "object-store.h"
#include "color.h"
static int transport_use_color = -1;
static char transport_colors[][COLOR_MAXLEN] = {
GIT_COLOR_RESET,
GIT_COLOR_RED /* REJECTED */
};
enum color_transport {
TRANSPORT_COLOR_RESET = 0,
TRANSPORT_COLOR_REJECTED = 1
};
static int transport_color_config(void)
{
const char *keys[] = {
"color.transport.reset",
"color.transport.rejected"
}, *key = "color.transport";
char *value;
int i;
static int initialized;
if (initialized)
return 0;
initialized = 1;
if (!git_config_get_string(key, &value))
transport_use_color = git_config_colorbool(key, value);
if (!want_color_stderr(transport_use_color))
return 0;
for (i = 0; i < ARRAY_SIZE(keys); i++)
if (!git_config_get_string(keys[i], &value)) {
if (!value)
return config_error_nonbool(keys[i]);
if (color_parse(value, transport_colors[i]) < 0)
return -1;
}
return 0;
}
static const char *transport_get_color(enum color_transport ix)
{
if (want_color_stderr(transport_use_color))
return transport_colors[ix];
return "";
}
static void set_upstreams(struct transport *transport, struct ref *refs,
int pretend)
{
struct ref *ref;
for (ref = refs; ref; ref = ref->next) {
const char *localname;
const char *tmp;
const char *remotename;
int flag = 0;
/*
* Check suitability for tracking. Must be successful /
* already up-to-date ref create/modify (not delete).
*/
if (ref->status != REF_STATUS_OK &&
ref->status != REF_STATUS_UPTODATE)
continue;
if (!ref->peer_ref)
continue;
if (is_null_oid(&ref->new_oid))
continue;
/* Follow symbolic refs (mainly for HEAD). */
localname = ref->peer_ref->name;
remotename = ref->name;
tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
NULL, &flag);
if (tmp && flag & REF_ISSYMREF &&
starts_with(tmp, "refs/heads/"))
localname = tmp;
/* Both source and destination must be local branches. */
if (!localname || !starts_with(localname, "refs/heads/"))
continue;
if (!remotename || !starts_with(remotename, "refs/heads/"))
continue;
if (!pretend) {
int flag = transport->verbose < 0 ? 0 : BRANCH_CONFIG_VERBOSE;
install_branch_config(flag, localname + 11,
transport->remote->name, remotename);
} else if (transport->verbose >= 0)
printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
localname + 11, remotename + 11,
transport->remote->name);
}
}
struct bundle_transport_data {
int fd;
struct bundle_header header;
unsigned get_refs_from_bundle_called : 1;
};
static struct ref *get_refs_from_bundle(struct transport *transport,
int for_push,
struct transport_ls_refs_options *transport_options)
{
struct bundle_transport_data *data = transport->data;
struct ref *result = NULL;
int i;
if (for_push)
return NULL;
data->get_refs_from_bundle_called = 1;
if (data->fd > 0)
close(data->fd);
data->fd = read_bundle_header(transport->url, &data->header);
if (data->fd < 0)
die(_("could not read bundle '%s'"), transport->url);
transport->hash_algo = data->header.hash_algo;
for (i = 0; i < data->header.references.nr; i++) {
struct ref_list_entry *e = data->header.references.list + i;
struct ref *ref = alloc_ref(e->name);
oidcpy(&ref->old_oid, &e->oid);
ref->next = result;
result = ref;
}
return result;
}
static int fetch_refs_from_bundle(struct transport *transport,
int nr_heads, struct ref **to_fetch)
{
struct bundle_transport_data *data = transport->data;
int ret;
if (!data->get_refs_from_bundle_called)
get_refs_from_bundle(transport, 0, NULL);
ret = unbundle(the_repository, &data->header, data->fd,
transport->progress ? BUNDLE_VERBOSE : 0);
transport->hash_algo = data->header.hash_algo;
return ret;
}
static int close_bundle(struct transport *transport)
{
struct bundle_transport_data *data = transport->data;
if (data->fd > 0)
close(data->fd);
free(data);
return 0;
}
struct git_transport_data {
struct git_transport_options options;
struct child_process *conn;
int fd[2];
unsigned got_remote_heads : 1;
enum protocol_version version;
struct oid_array extra_have;
struct oid_array shallow;
};
static int set_git_option(struct git_transport_options *opts,
const char *name, const char *value)
{
if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
opts->uploadpack = value;
return 0;
} else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
opts->receivepack = value;
return 0;
} else if (!strcmp(name, TRANS_OPT_THIN)) {
opts->thin = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
opts->followtags = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_KEEP)) {
opts->keep = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
opts->update_shallow = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_DEPTH)) {
if (!value)
opts->depth = 0;
else {
char *end;
opts->depth = strtol(value, &end, 0);
if (*end)
die(_("transport: invalid depth option '%s'"), value);
}
return 0;
} else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
opts->deepen_since = value;
return 0;
} else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
opts->deepen_not = (const struct string_list *)value;
return 0;
} else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
opts->deepen_relative = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
opts->from_promisor = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
list_objects_filter_die_if_populated(&opts->filter_options);
parse_list_objects_filter(&opts->filter_options, value);
return 0;
} else if (!strcmp(name, TRANS_OPT_REJECT_SHALLOW)) {
opts->reject_shallow = !!value;
return 0;
}
return 1;
}
static int connect_setup(struct transport *transport, int for_push)
{
struct git_transport_data *data = transport->data;
int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
if (data->conn)
return 0;
switch (transport->family) {
case TRANSPORT_FAMILY_ALL: break;
case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
}
data->conn = git_connect(data->fd, transport->url,
for_push ? data->options.receivepack :
data->options.uploadpack,
flags);
return 0;
}
static void die_if_server_options(struct transport *transport)
{
if (!transport->server_options || !transport->server_options->nr)
return;
advise(_("see protocol.version in 'git help config' for more details"));
die(_("server options require protocol version 2 or later"));
}
/*
* Obtains the protocol version from the transport and writes it to
* transport->data->version, first connecting if not already connected.
*
* If the protocol version is one that allows skipping the listing of remote
* refs, and must_list_refs is 0, the listing of remote refs is skipped and
* this function returns NULL. Otherwise, this function returns the list of
* remote refs.
*/
static struct ref *handshake(struct transport *transport, int for_push,
struct transport_ls_refs_options *options,
int must_list_refs)
{
struct git_transport_data *data = transport->data;
struct ref *refs = NULL;
struct packet_reader reader;
int sid_len;
const char *server_sid;
connect_setup(transport, for_push);
packet_reader_init(&reader, data->fd[0], NULL, 0,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_GENTLE_ON_EOF |
PACKET_READ_DIE_ON_ERR_PACKET);
data->version = discover_version(&reader);
switch (data->version) {
case protocol_v2:
if (server_feature_v2("session-id", &server_sid))
trace2_data_string("transfer", NULL, "server-sid", server_sid);
if (must_list_refs)
get_remote_refs(data->fd[1], &reader, &refs, for_push,
options,
transport->server_options,
transport->stateless_rpc);
break;
case protocol_v1:
case protocol_v0:
die_if_server_options(transport);
get_remote_heads(&reader, &refs,
for_push ? REF_NORMAL : 0,
&data->extra_have,
&data->shallow);
server_sid = server_feature_value("session-id", &sid_len);
if (server_sid) {
char *sid = xstrndup(server_sid, sid_len);
trace2_data_string("transfer", NULL, "server-sid", sid);
free(sid);
}
break;
case protocol_unknown_version:
BUG("unknown protocol version");
}
data->got_remote_heads = 1;
transport->hash_algo = reader.hash_algo;
if (reader.line_peeked)
BUG("buffer must be empty at the end of handshake()");
return refs;
}
static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
struct transport_ls_refs_options *options)
{
return handshake(transport, for_push, options, 1);
}
static int fetch_refs_via_pack(struct transport *transport,
int nr_heads, struct ref **to_fetch)
{
int ret = 0;
struct git_transport_data *data = transport->data;
struct ref *refs = NULL;
struct fetch_pack_args args;
struct ref *refs_tmp = NULL;
memset(&args, 0, sizeof(args));
args.uploadpack = data->options.uploadpack;
args.keep_pack = data->options.keep;
args.lock_pack = 1;
args.use_thin_pack = data->options.thin;
args.include_tag = data->options.followtags;
args.verbose = (transport->verbose > 1);
args.quiet = (transport->verbose < 0);
args.no_progress = !transport->progress;
args.depth = data->options.depth;
args.deepen_since = data->options.deepen_since;
args.deepen_not = data->options.deepen_not;
args.deepen_relative = data->options.deepen_relative;
args.check_self_contained_and_connected =
data->options.check_self_contained_and_connected;
args.cloning = transport->cloning;
args.update_shallow = data->options.update_shallow;
args.from_promisor = data->options.from_promisor;
args.filter_options = data->options.filter_options;
args.stateless_rpc = transport->stateless_rpc;
args.server_options = transport->server_options;
args.negotiation_tips = data->options.negotiation_tips;
args.reject_shallow_remote = transport->smart_options->reject_shallow;
if (!data->got_remote_heads) {
int i;
int must_list_refs = 0;
for (i = 0; i < nr_heads; i++) {
if (!to_fetch[i]->exact_oid) {
must_list_refs = 1;
break;
}
}
refs_tmp = handshake(transport, 0, NULL, must_list_refs);
}
if (data->version == protocol_unknown_version)
BUG("unknown protocol version");
else if (data->version <= protocol_v1)
die_if_server_options(transport);
if (data->options.acked_commits) {
if (data->version < protocol_v2) {
warning(_("--negotiate-only requires protocol v2"));
ret = -1;
} else if (!server_supports_feature("fetch", "wait-for-done", 0)) {
warning(_("server does not support wait-for-done"));
ret = -1;
} else {
negotiate_using_fetch(data->options.negotiation_tips,
transport->server_options,
transport->stateless_rpc,
data->fd,
data->options.acked_commits);
ret = 0;
}
goto cleanup;
}
refs = fetch_pack(&args, data->fd,
refs_tmp ? refs_tmp : transport->remote_refs,
to_fetch, nr_heads, &data->shallow,
&transport->pack_lockfiles, data->version);
data->got_remote_heads = 0;
data->options.self_contained_and_connected =
args.self_contained_and_connected;
data->options.connectivity_checked = args.connectivity_checked;
if (refs == NULL)
ret = -1;
if (report_unmatched_refs(to_fetch, nr_heads))
ret = -1;
cleanup:
close(data->fd[0]);
if (data->fd[1] >= 0)
close(data->fd[1]);
if (finish_connect(data->conn))
ret = -1;
data->conn = NULL;
free_refs(refs_tmp);
free_refs(refs);
return ret;
}
static int push_had_errors(struct ref *ref)
{
for (; ref; ref = ref->next) {
switch (ref->status) {
case REF_STATUS_NONE:
case REF_STATUS_UPTODATE:
case REF_STATUS_OK:
break;
default:
return 1;
}
}
return 0;
}
int transport_refs_pushed(struct ref *ref)
{
for (; ref; ref = ref->next) {
switch(ref->status) {
case REF_STATUS_NONE:
case REF_STATUS_UPTODATE:
break;
default:
return 1;
}
}
return 0;
}
static void update_one_tracking_ref(struct remote *remote, char *refname,
struct object_id *new_oid, int deletion,
int verbose)
{
struct refspec_item rs;
memset(&rs, 0, sizeof(rs));
rs.src = refname;
rs.dst = NULL;
if (!remote_find_tracking(remote, &rs)) {
if (verbose)
fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
if (deletion)
delete_ref(NULL, rs.dst, NULL, 0);
else
update_ref("update by push", rs.dst, new_oid,
NULL, 0, 0);
free(rs.dst);
}
}
void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
{
char *refname;
struct object_id *new_oid;
struct ref_push_report *report;
if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
return;
report = ref->report;
if (!report)
update_one_tracking_ref(remote, ref->name, &ref->new_oid,
ref->deletion, verbose);
else
for (; report; report = report->next) {
refname = report->ref_name ? (char *)report->ref_name : ref->name;
new_oid = report->new_oid ? report->new_oid : &ref->new_oid;
update_one_tracking_ref(remote, refname, new_oid,
is_null_oid(new_oid), verbose);
}
}
static void print_ref_status(char flag, const char *summary,
struct ref *to, struct ref *from, const char *msg,
struct ref_push_report *report,
int porcelain, int summary_width)
{
const char *to_name;
if (report && report->ref_name)
to_name = report->ref_name;
else
to_name = to->name;
if (porcelain) {
if (from)
fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to_name);
else
fprintf(stdout, "%c\t:%s\t", flag, to_name);
if (msg)
fprintf(stdout, "%s (%s)\n", summary, msg);
else
fprintf(stdout, "%s\n", summary);
} else {
const char *red = "", *reset = "";
if (push_had_errors(to)) {
red = transport_get_color(TRANSPORT_COLOR_REJECTED);
reset = transport_get_color(TRANSPORT_COLOR_RESET);
}
fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
summary, reset);
if (from)
fprintf(stderr, "%s -> %s",
prettify_refname(from->name),
prettify_refname(to_name));
else
fputs(prettify_refname(to_name), stderr);
if (msg) {
fputs(" (", stderr);
fputs(msg, stderr);
fputc(')', stderr);
}
fputc('\n', stderr);
}
}
static void print_ok_ref_status(struct ref *ref,
struct ref_push_report *report,
int porcelain, int summary_width)
{
struct object_id *old_oid;
struct object_id *new_oid;
const char *ref_name;
int forced_update;
if (report && report->old_oid)
old_oid = report->old_oid;
else
old_oid = &ref->old_oid;
if (report && report->new_oid)
new_oid = report->new_oid;
else
new_oid = &ref->new_oid;
if (report && report->forced_update)
forced_update = report->forced_update;
else
forced_update = ref->forced_update;
if (report && report->ref_name)
ref_name = report->ref_name;
else
ref_name = ref->name;
if (ref->deletion)
print_ref_status('-', "[deleted]", ref, NULL, NULL,
report, porcelain, summary_width);
else if (is_null_oid(old_oid))
print_ref_status('*',
(starts_with(ref_name, "refs/tags/")
? "[new tag]"
: (starts_with(ref_name, "refs/heads/")
? "[new branch]"
: "[new reference]")),
ref, ref->peer_ref, NULL,
report, porcelain, summary_width);
else {
struct strbuf quickref = STRBUF_INIT;
char type;
const char *msg;
strbuf_add_unique_abbrev(&quickref, old_oid,
DEFAULT_ABBREV);
if (forced_update) {
strbuf_addstr(&quickref, "...");
type = '+';
msg = "forced update";
} else {
strbuf_addstr(&quickref, "..");
type = ' ';
msg = NULL;
}
strbuf_add_unique_abbrev(&quickref, new_oid,
DEFAULT_ABBREV);
print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
report, porcelain, summary_width);
strbuf_release(&quickref);
}
}
static int print_one_push_report(struct ref *ref, const char *dest, int count,
struct ref_push_report *report,
int porcelain, int summary_width)
{
if (!count) {
char *url = transport_anonymize_url(dest);
fprintf(porcelain ? stdout : stderr, "To %s\n", url);
free(url);
}
switch(ref->status) {
case REF_STATUS_NONE:
print_ref_status('X', "[no match]", ref, NULL, NULL,
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_NODELETE:
print_ref_status('!', "[rejected]", ref, NULL,
"remote does not support deleting refs",
report, porcelain, summary_width);
break;
case REF_STATUS_UPTODATE:
print_ref_status('=', "[up to date]", ref,
ref->peer_ref, NULL,
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_NONFASTFORWARD:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"non-fast-forward",
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_ALREADY_EXISTS:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"already exists",
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_FETCH_FIRST:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"fetch first",
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_NEEDS_FORCE:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"needs force",
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_STALE:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"stale info",
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_REMOTE_UPDATED:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"remote ref updated since checkout",
report, porcelain, summary_width);
break;
case REF_STATUS_REJECT_SHALLOW:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"new shallow roots not allowed",
report, porcelain, summary_width);
break;
case REF_STATUS_REMOTE_REJECT:
print_ref_status('!', "[remote rejected]", ref,
ref->deletion ? NULL : ref->peer_ref,
ref->remote_status,
report, porcelain, summary_width);
break;
case REF_STATUS_EXPECTING_REPORT:
print_ref_status('!', "[remote failure]", ref,
ref->deletion ? NULL : ref->peer_ref,
"remote failed to report status",
report, porcelain, summary_width);
break;
case REF_STATUS_ATOMIC_PUSH_FAILED:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"atomic push failed",
report, porcelain, summary_width);
break;
case REF_STATUS_OK:
print_ok_ref_status(ref, report, porcelain, summary_width);
break;
}
return 1;
}
static int print_one_push_status(struct ref *ref, const char *dest, int count,
int porcelain, int summary_width)
{
struct ref_push_report *report;
int n = 0;
if (!ref->report)
return print_one_push_report(ref, dest, count,
NULL, porcelain, summary_width);
for (report = ref->report; report; report = report->next)
print_one_push_report(ref, dest, count + n++,
report, porcelain, summary_width);
return n;
}
static int measure_abbrev(const struct object_id *oid, int sofar)
{
char hex[GIT_MAX_HEXSZ + 1];
int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
return (w < sofar) ? sofar : w;
}
int transport_summary_width(const struct ref *refs)
{
int maxw = -1;
for (; refs; refs = refs->next) {
maxw = measure_abbrev(&refs->old_oid, maxw);
maxw = measure_abbrev(&refs->new_oid, maxw);
}
if (maxw < 0)
maxw = FALLBACK_DEFAULT_ABBREV;
return (2 * maxw + 3);
}
void transport_print_push_status(const char *dest, struct ref *refs,
int verbose, int porcelain, unsigned int *reject_reasons)
{
struct ref *ref;
int n = 0;
char *head;
int summary_width = transport_summary_width(refs);
if (transport_color_config() < 0)
warning(_("could not parse transport.color.* config"));
head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
if (verbose) {
for (ref = refs; ref; ref = ref->next)
if (ref->status == REF_STATUS_UPTODATE)
n += print_one_push_status(ref, dest, n,
porcelain, summary_width);
}
for (ref = refs; ref; ref = ref->next)
if (ref->status == REF_STATUS_OK)
n += print_one_push_status(ref, dest, n,
porcelain, summary_width);
*reject_reasons = 0;
for (ref = refs; ref; ref = ref->next) {
if (ref->status != REF_STATUS_NONE &&
ref->status != REF_STATUS_UPTODATE &&
ref->status != REF_STATUS_OK)
n += print_one_push_status(ref, dest, n,
porcelain, summary_width);
if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
if (head != NULL && !strcmp(head, ref->name))
*reject_reasons |= REJECT_NON_FF_HEAD;
else
*reject_reasons |= REJECT_NON_FF_OTHER;
} else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
*reject_reasons |= REJECT_ALREADY_EXISTS;
} else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
*reject_reasons |= REJECT_FETCH_FIRST;
} else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
*reject_reasons |= REJECT_NEEDS_FORCE;
} else if (ref->status == REF_STATUS_REJECT_REMOTE_UPDATED) {
*reject_reasons |= REJECT_REF_NEEDS_UPDATE;
}
}
free(head);
}
static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
{
struct git_transport_data *data = transport->data;
struct send_pack_args args;
int ret = 0;
if (transport_color_config() < 0)
return -1;
if (!data->got_remote_heads)
get_refs_via_connect(transport, 1, NULL);
memset(&args, 0, sizeof(args));
args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
args.use_thin_pack = data->options.thin;
args.verbose = (transport->verbose > 0);
args.quiet = (transport->verbose < 0);
args.progress = transport->progress;
args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
args.push_options = transport->push_options;
args.url = transport->url;
if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
else
args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
switch (data->version) {
case protocol_v2:
die(_("support for protocol v2 not implemented yet"));
break;
case protocol_v1:
case protocol_v0:
ret = send_pack(&args, data->fd, data->conn, remote_refs,
&data->extra_have);
break;
case protocol_unknown_version:
BUG("unknown protocol version");
}
close(data->fd[1]);
close(data->fd[0]);
/*
* Atomic push may abort the connection early and close the pipe,
* which may cause an error for `finish_connect()`. Ignore this error
* for atomic git-push.
*/
if (ret || args.atomic)
finish_connect(data->conn);
else
ret = finish_connect(data->conn);
data->conn = NULL;
data->got_remote_heads = 0;
return ret;
}
static int connect_git(struct transport *transport, const char *name,
const char *executable, int fd[2])
{
struct git_transport_data *data = transport->data;
data->conn = git_connect(data->fd, transport->url,
executable, 0);
fd[0] = data->fd[0];
fd[1] = data->fd[1];
return 0;
}
static int disconnect_git(struct transport *transport)
{
struct git_transport_data *data = transport->data;
if (data->conn) {
if (data->got_remote_heads && !transport->stateless_rpc)
packet_flush(data->fd[1]);
close(data->fd[0]);
if (data->fd[1] >= 0)
close(data->fd[1]);
finish_connect(data->conn);
}
free(data);
return 0;
}
static struct transport_vtable taken_over_vtable = {
NULL,
get_refs_via_connect,
fetch_refs_via_pack,
git_transport_push,
NULL,
disconnect_git
};
void transport_take_over(struct transport *transport,
struct child_process *child)
{
struct git_transport_data *data;
if (!transport->smart_options)
BUG("taking over transport requires non-NULL "
"smart_options field.");
CALLOC_ARRAY(data, 1);
data->options = *transport->smart_options;
data->conn = child;
data->fd[0] = data->conn->out;
data->fd[1] = data->conn->in;
data->got_remote_heads = 0;
transport->data = data;
transport->vtable = &taken_over_vtable;
transport->smart_options = &(data->options);
transport->cannot_reuse = 1;
}
static int is_file(const char *url)
{
struct stat buf;
if (stat(url, &buf))
return 0;
return S_ISREG(buf.st_mode);
}
static int external_specification_len(const char *url)
{
return strchr(url, ':') - url;
}
static const struct string_list *protocol_whitelist(void)
{
static int enabled = -1;
static struct string_list allowed = STRING_LIST_INIT_DUP;
if (enabled < 0) {
const char *v = getenv("GIT_ALLOW_PROTOCOL");
if (v) {
string_list_split(&allowed, v, ':', -1);
string_list_sort(&allowed);
enabled = 1;
} else {
enabled = 0;
}
}
return enabled ? &allowed : NULL;
}
enum protocol_allow_config {
PROTOCOL_ALLOW_NEVER = 0,
PROTOCOL_ALLOW_USER_ONLY,
PROTOCOL_ALLOW_ALWAYS
};
static enum protocol_allow_config parse_protocol_config(const char *key,
const char *value)
{
if (!strcasecmp(value, "always"))
return PROTOCOL_ALLOW_ALWAYS;
else if (!strcasecmp(value, "never"))
return PROTOCOL_ALLOW_NEVER;
else if (!strcasecmp(value, "user"))
return PROTOCOL_ALLOW_USER_ONLY;
die(_("unknown value for config '%s': %s"), key, value);
}
static enum protocol_allow_config get_protocol_config(const char *type)
{
char *key = xstrfmt("protocol.%s.allow", type);
char *value;
/* first check the per-protocol config */
if (!git_config_get_string(key, &value)) {
enum protocol_allow_config ret =
parse_protocol_config(key, value);
free(key);
free(value);
return ret;
}
free(key);
/* if defined, fallback to user-defined default for unknown protocols */
if (!git_config_get_string("protocol.allow", &value)) {
enum protocol_allow_config ret =
parse_protocol_config("protocol.allow", value);
free(value);
return ret;
}
/* fallback to built-in defaults */
/* known safe */
if (!strcmp(type, "http") ||
!strcmp(type, "https") ||
!strcmp(type, "git") ||
!strcmp(type, "ssh") ||
!strcmp(type, "file"))
return PROTOCOL_ALLOW_ALWAYS;
/* known scary; err on the side of caution */
if (!strcmp(type, "ext"))
return PROTOCOL_ALLOW_NEVER;
/* unknown; by default let them be used only directly by the user */
return PROTOCOL_ALLOW_USER_ONLY;
}
int is_transport_allowed(const char *type, int from_user)
{
const struct string_list *whitelist = protocol_whitelist();
if (whitelist)
return string_list_has_string(whitelist, type);
switch (get_protocol_config(type)) {
case PROTOCOL_ALLOW_ALWAYS:
return 1;
case PROTOCOL_ALLOW_NEVER:
return 0;
case PROTOCOL_ALLOW_USER_ONLY:
if (from_user < 0)
from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
return from_user;
}
BUG("invalid protocol_allow_config type");
}
void transport_check_allowed(const char *type)
{
if (!is_transport_allowed(type, -1))
die(_("transport '%s' not allowed"), type);
}
static struct transport_vtable bundle_vtable = {
NULL,
get_refs_from_bundle,
fetch_refs_from_bundle,
NULL,
NULL,
close_bundle
};
static struct transport_vtable builtin_smart_vtable = {
NULL,
get_refs_via_connect,
fetch_refs_via_pack,
git_transport_push,
connect_git,
disconnect_git
};
struct transport *transport_get(struct remote *remote, const char *url)
{
const char *helper;
struct transport *ret = xcalloc(1, sizeof(*ret));
ret->progress = isatty(2);
string_list_init(&ret->pack_lockfiles, 1);
if (!remote)
BUG("No remote provided to transport_get()");
ret->got_remote_refs = 0;
ret->remote = remote;
helper = remote->foreign_vcs;
if (!url && remote->url)
url = remote->url[0];
ret->url = url;
/* maybe it is a foreign URL? */
if (url) {
const char *p = url;
while (is_urlschemechar(p == url, *p))
p++;
if (starts_with(p, "::"))
helper = xstrndup(url, p - url);
}
if (helper) {
transport_helper_init(ret, helper);
} else if (starts_with(url, "rsync:")) {
die(_("git-over-rsync is no longer supported"));
} else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
transport_check_allowed("file");
ret->data = data;
ret->vtable = &bundle_vtable;
ret->smart_options = NULL;
} else if (!is_url(url)
|| starts_with(url, "file://")
|| starts_with(url, "git://")
|| starts_with(url, "ssh://")
|| starts_with(url, "git+ssh://") /* deprecated - do not use */
|| starts_with(url, "ssh+git://") /* deprecated - do not use */
) {
/*
* These are builtin smart transports; "allowed" transports
* will be checked individually in git_connect.
*/
struct git_transport_data *data = xcalloc(1, sizeof(*data));
ret->data = data;
ret->vtable = &builtin_smart_vtable;
ret->smart_options = &(data->options);
data->conn = NULL;
data->got_remote_heads = 0;
} else {
/* Unknown protocol in URL. Pass to external handler. */
int len = external_specification_len(url);
char *handler = xmemdupz(url, len);
transport_helper_init(ret, handler);
}
if (ret->smart_options) {
ret->smart_options->thin = 1;
ret->smart_options->uploadpack = "git-upload-pack";
if (remote->uploadpack)
ret->smart_options->uploadpack = remote->uploadpack;
ret->smart_options->receivepack = "git-receive-pack";
if (remote->receivepack)
ret->smart_options->receivepack = remote->receivepack;
}
ret->hash_algo = &hash_algos[GIT_HASH_SHA1];
return ret;
}
const struct git_hash_algo *transport_get_hash_algo(struct transport *transport)
{
return transport->hash_algo;
}
int transport_set_option(struct transport *transport,
const char *name, const char *value)
{
int git_reports = 1, protocol_reports = 1;
if (transport->smart_options)
git_reports = set_git_option(transport->smart_options,
name, value);
if (transport->vtable->set_option)
protocol_reports = transport->vtable->set_option(transport,
name, value);
/* If either report is 0, report 0 (success). */
if (!git_reports || !protocol_reports)
return 0;
/* If either reports -1 (invalid value), report -1. */
if ((git_reports == -1) || (protocol_reports == -1))
return -1;
/* Otherwise if both report unknown, report unknown. */
return 1;
}
void transport_set_verbosity(struct transport *transport, int verbosity,
int force_progress)
{
if (verbosity >= 1)
transport->verbose = verbosity <= 3 ? verbosity : 3;
if (verbosity < 0)
transport->verbose = -1;
/**
* Rules used to determine whether to report progress (processing aborts
* when a rule is satisfied):
*
* . Report progress, if force_progress is 1 (ie. --progress).
* . Don't report progress, if force_progress is 0 (ie. --no-progress).
* . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
* . Report progress if isatty(2) is 1.
**/
if (force_progress >= 0)
transport->progress = !!force_progress;
else
transport->progress = verbosity >= 0 && isatty(2);
}
static void die_with_unpushed_submodules(struct string_list *needs_pushing)
{
int i;
fprintf(stderr, _("The following submodule paths contain changes that can\n"
"not be found on any remote:\n"));
for (i = 0; i < needs_pushing->nr; i++)
fprintf(stderr, " %s\n", needs_pushing->items[i].string);
fprintf(stderr, _("\nPlease try\n\n"
" git push --recurse-submodules=on-demand\n\n"
"or cd to the path and use\n\n"
" git push\n\n"
"to push them to a remote.\n\n"));
string_list_clear(needs_pushing, 0);
die(_("Aborting."));
}
static int run_pre_push_hook(struct transport *transport,
struct ref *remote_refs)
{
int ret = 0, x;
struct ref *r;
struct child_process proc = CHILD_PROCESS_INIT;
struct strbuf buf;
const char *argv[4];
if (!(argv[0] = find_hook("pre-push")))
return 0;
argv[1] = transport->remote->name;
argv[2] = transport->url;
argv[3] = NULL;
proc.argv = argv;
proc.in = -1;
proc.trace2_hook_name = "pre-push";
if (start_command(&proc)) {
finish_command(&proc);
return -1;
}
sigchain_push(SIGPIPE, SIG_IGN);
strbuf_init(&buf, 256);
for (r = remote_refs; r; r = r->next) {
if (!r->peer_ref) continue;
if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
if (r->status == REF_STATUS_REJECT_STALE) continue;
if (r->status == REF_STATUS_REJECT_REMOTE_UPDATED) continue;
if (r->status == REF_STATUS_UPTODATE) continue;
strbuf_reset(&buf);
strbuf_addf( &buf, "%s %s %s %s\n",
r->peer_ref->name, oid_to_hex(&r->new_oid),
r->name, oid_to_hex(&r->old_oid));
if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
/* We do not mind if a hook does not read all refs. */
if (errno != EPIPE)
ret = -1;
break;
}
}
strbuf_release(&buf);
x = close(proc.in);
if (!ret)
ret = x;
sigchain_pop(SIGPIPE);
x = finish_command(&proc);
if (!ret)
ret = x;
return ret;
}
int transport_push(struct repository *r,
struct transport *transport,
struct refspec *rs, int flags,
unsigned int *reject_reasons)
{
*reject_reasons = 0;
if (transport_color_config() < 0)
return -1;
if (transport->vtable->push_refs) {
struct ref *remote_refs;
struct ref *local_refs = get_local_heads();
int match_flags = MATCH_REFS_NONE;
int verbose = (transport->verbose > 0);
int quiet = (transport->verbose < 0);
int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
int push_ret, ret, err;
struct transport_ls_refs_options transport_options =
TRANSPORT_LS_REFS_OPTIONS_INIT;
if (check_push_refs(local_refs, rs) < 0)
return -1;
refspec_ref_prefixes(rs, &transport_options.ref_prefixes);
trace2_region_enter("transport_push", "get_refs_list", r);
remote_refs = transport->vtable->get_refs_list(transport, 1,
&transport_options);
trace2_region_leave("transport_push", "get_refs_list", r);
strvec_clear(&transport_options.ref_prefixes);
if (flags & TRANSPORT_PUSH_ALL)
match_flags |= MATCH_REFS_ALL;
if (flags & TRANSPORT_PUSH_MIRROR)
match_flags |= MATCH_REFS_MIRROR;
if (flags & TRANSPORT_PUSH_PRUNE)
match_flags |= MATCH_REFS_PRUNE;
if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
match_flags |= MATCH_REFS_FOLLOW_TAGS;
if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
return -1;
if (transport->smart_options &&
transport->smart_options->cas &&
!is_empty_cas(transport->smart_options->cas))
apply_push_cas(transport->smart_options->cas,
transport->remote, remote_refs);
set_ref_status_for_push(remote_refs,
flags & TRANSPORT_PUSH_MIRROR,
flags & TRANSPORT_PUSH_FORCE);
if (!(flags & TRANSPORT_PUSH_NO_HOOK))
if (run_pre_push_hook(transport, remote_refs))
return -1;
if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
!is_bare_repository()) {
struct ref *ref = remote_refs;
struct oid_array commits = OID_ARRAY_INIT;
trace2_region_enter("transport_push", "push_submodules", r);
for (; ref; ref = ref->next)
if (!is_null_oid(&ref->new_oid))
oid_array_append(&commits,
&ref->new_oid);
if (!push_unpushed_submodules(r,
&commits,
transport->remote,
rs,
transport->push_options,
pretend)) {
oid_array_clear(&commits);
trace2_region_leave("transport_push", "push_submodules", r);
die(_("failed to push all needed submodules"));
}
oid_array_clear(&commits);
trace2_region_leave("transport_push", "push_submodules", r);
}
if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
!pretend)) && !is_bare_repository()) {
struct ref *ref = remote_refs;
struct string_list needs_pushing = STRING_LIST_INIT_DUP;
struct oid_array commits = OID_ARRAY_INIT;
trace2_region_enter("transport_push", "check_submodules", r);
for (; ref; ref = ref->next)
if (!is_null_oid(&ref->new_oid))
oid_array_append(&commits,
&ref->new_oid);
if (find_unpushed_submodules(r,
&commits,
transport->remote->name,
&needs_pushing)) {
oid_array_clear(&commits);
trace2_region_leave("transport_push", "check_submodules", r);
die_with_unpushed_submodules(&needs_pushing);
}
string_list_clear(&needs_pushing, 0);
oid_array_clear(&commits);
trace2_region_leave("transport_push", "check_submodules", r);
}
if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY)) {
trace2_region_enter("transport_push", "push_refs", r);
push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
trace2_region_leave("transport_push", "push_refs", r);
} else
push_ret = 0;
err = push_had_errors(remote_refs);
ret = push_ret | err;
if (!quiet || err)
transport_print_push_status(transport->url, remote_refs,
verbose | porcelain, porcelain,
reject_reasons);
if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
set_upstreams(transport, remote_refs, pretend);
if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
struct ref *ref;
for (ref = remote_refs; ref; ref = ref->next)
transport_update_tracking_ref(transport->remote, ref, verbose);
}
if (porcelain && !push_ret)
puts("Done");
else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
fprintf(stderr, "Everything up-to-date\n");
return ret;
}
return 1;
}
const struct ref *transport_get_remote_refs(struct transport *transport,
struct transport_ls_refs_options *transport_options)
{
if (!transport->got_remote_refs) {
transport->remote_refs =
transport->vtable->get_refs_list(transport, 0,
transport_options);
transport->got_remote_refs = 1;
}
return transport->remote_refs;
}
int transport_fetch_refs(struct transport *transport, struct ref *refs)
{
int rc;
int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
struct ref **heads = NULL;
struct ref *rm;
for (rm = refs; rm; rm = rm->next) {
nr_refs++;
if (rm->peer_ref &&
!is_null_oid(&rm->old_oid) &&
oideq(&rm->peer_ref->old_oid, &rm->old_oid))
continue;
ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
heads[nr_heads++] = rm;
}
if (!nr_heads) {
/*
* When deepening of a shallow repository is requested,
* then local and remote refs are likely to still be equal.
* Just feed them all to the fetch method in that case.
* This condition shouldn't be met in a non-deepening fetch
* (see builtin/fetch.c:quickfetch()).
*/
ALLOC_ARRAY(heads, nr_refs);
for (rm = refs; rm; rm = rm->next)
heads[nr_heads++] = rm;
}
rc = transport->vtable->fetch(transport, nr_heads, heads);
free(heads);
return rc;
}
void transport_unlock_pack(struct transport *transport)
{
int i;
for (i = 0; i < transport->pack_lockfiles.nr; i++)
unlink_or_warn(transport->pack_lockfiles.items[i].string);
string_list_clear(&transport->pack_lockfiles, 0);
}
int transport_connect(struct transport *transport, const char *name,
const char *exec, int fd[2])
{
if (transport->vtable->connect)
return transport->vtable->connect(transport, name, exec, fd);
else
die(_("operation not supported by protocol"));
}
int transport_disconnect(struct transport *transport)
{
int ret = 0;
if (transport->vtable->disconnect)
ret = transport->vtable->disconnect(transport);
if (transport->got_remote_refs)
free_refs((void *)transport->remote_refs);
free(transport);
return ret;
}
/*
* Strip username (and password) from a URL and return
* it in a newly allocated string.
*/
char *transport_anonymize_url(const char *url)
{
char *scheme_prefix, *anon_part;
size_t anon_len, prefix_len = 0;
anon_part = strchr(url, '@');
if (url_is_local_not_ssh(url) || !anon_part)
goto literal_copy;
anon_len = strlen(++anon_part);
scheme_prefix = strstr(url, "://");
if (!scheme_prefix) {
if (!strchr(anon_part, ':'))
/* cannot be "me@there:/path/name" */
goto literal_copy;
} else {
const char *cp;
/* make sure scheme is reasonable */
for (cp = url; cp < scheme_prefix; cp++) {
switch (*cp) {
/* RFC 1738 2.1 */
case '+': case '.': case '-':
break; /* ok */
default:
if (isalnum(*cp))
break;
/* it isn't */
goto literal_copy;
}
}
/* @ past the first slash does not count */
cp = strchr(scheme_prefix + 3, '/');
if (cp && cp < anon_part)
goto literal_copy;
prefix_len = scheme_prefix - url + 3;
}
return xstrfmt("%.*s%.*s", (int)prefix_len, url,
(int)anon_len, anon_part);
literal_copy:
return xstrdup(url);
}
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