#include "cache.h"
#include "config.h"
#include "refs.h"
#include "pkt-line.h"
#include "sideband.h"
#include "repository.h"
#include "object-store.h"
#include "tag.h"
#include "object.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "list-objects.h"
#include "list-objects-filter.h"
#include "list-objects-filter-options.h"
#include "run-command.h"
#include "connect.h"
#include "sigchain.h"
#include "version.h"
#include "string-list.h"
#include "strvec.h"
#include "prio-queue.h"
#include "protocol.h"
#include "quote.h"
#include "upload-pack.h"
#include "serve.h"
#include "commit-graph.h"
#include "commit-reach.h"
#include "shallow.h"
/* Remember to update object flag allocation in object.h */
#define THEY_HAVE (1u << 11)
#define OUR_REF (1u << 12)
#define WANTED (1u << 13)
#define COMMON_KNOWN (1u << 14)
#define SHALLOW (1u << 16)
#define NOT_SHALLOW (1u << 17)
#define CLIENT_SHALLOW (1u << 18)
#define HIDDEN_REF (1u << 19)
#define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
/* Enum for allowed unadvertised object request (UOR) */
enum allow_uor {
/* Allow specifying sha1 if it is a ref tip. */
ALLOW_TIP_SHA1 = 0x01,
/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
ALLOW_REACHABLE_SHA1 = 0x02,
/* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
ALLOW_ANY_SHA1 = 0x07
};
/*
* Please annotate, and if possible group together, fields used only
* for protocol v0 or only for protocol v2.
*/
struct upload_pack_data {
struct string_list symref; /* v0 only */
struct object_array want_obj;
struct object_array have_obj;
struct oid_array haves; /* v2 only */
struct string_list wanted_refs; /* v2 only */
struct object_array shallows;
struct string_list deepen_not;
struct object_array extra_edge_obj;
int depth;
timestamp_t deepen_since;
int deepen_rev_list;
int deepen_relative;
int keepalive;
int shallow_nr;
timestamp_t oldest_have;
unsigned int timeout; /* v0 only */
enum {
NO_MULTI_ACK = 0,
MULTI_ACK = 1,
MULTI_ACK_DETAILED = 2
} multi_ack; /* v0 only */
/* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
int use_sideband;
struct string_list uri_protocols;
enum allow_uor allow_uor;
struct list_objects_filter_options filter_options;
struct string_list allowed_filters;
struct packet_writer writer;
const char *pack_objects_hook;
unsigned stateless_rpc : 1; /* v0 only */
unsigned no_done : 1; /* v0 only */
unsigned daemon_mode : 1; /* v0 only */
unsigned filter_capability_requested : 1; /* v0 only */
unsigned use_thin_pack : 1;
unsigned use_ofs_delta : 1;
unsigned no_progress : 1;
unsigned use_include_tag : 1;
unsigned allow_filter : 1;
unsigned allow_filter_fallback : 1;
unsigned long tree_filter_max_depth;
unsigned done : 1; /* v2 only */
unsigned allow_ref_in_want : 1; /* v2 only */
unsigned allow_sideband_all : 1; /* v2 only */
};
static void upload_pack_data_init(struct upload_pack_data *data)
{
struct string_list symref = STRING_LIST_INIT_DUP;
struct string_list wanted_refs = STRING_LIST_INIT_DUP;
struct object_array want_obj = OBJECT_ARRAY_INIT;
struct object_array have_obj = OBJECT_ARRAY_INIT;
struct oid_array haves = OID_ARRAY_INIT;
struct object_array shallows = OBJECT_ARRAY_INIT;
struct string_list deepen_not = STRING_LIST_INIT_DUP;
struct string_list uri_protocols = STRING_LIST_INIT_DUP;
struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
struct string_list allowed_filters = STRING_LIST_INIT_DUP;
memset(data, 0, sizeof(*data));
data->symref = symref;
data->wanted_refs = wanted_refs;
data->want_obj = want_obj;
data->have_obj = have_obj;
data->haves = haves;
data->shallows = shallows;
data->deepen_not = deepen_not;
data->uri_protocols = uri_protocols;
data->extra_edge_obj = extra_edge_obj;
data->allowed_filters = allowed_filters;
data->allow_filter_fallback = 1;
data->tree_filter_max_depth = ULONG_MAX;
packet_writer_init(&data->writer, 1);
data->keepalive = 5;
}
static void upload_pack_data_clear(struct upload_pack_data *data)
{
string_list_clear(&data->symref, 1);
string_list_clear(&data->wanted_refs, 1);
object_array_clear(&data->want_obj);
object_array_clear(&data->have_obj);
oid_array_clear(&data->haves);
object_array_clear(&data->shallows);
string_list_clear(&data->deepen_not, 0);
object_array_clear(&data->extra_edge_obj);
list_objects_filter_release(&data->filter_options);
string_list_clear(&data->allowed_filters, 1);
free((char *)data->pack_objects_hook);
}
static void reset_timeout(unsigned int timeout)
{
alarm(timeout);
}
static void send_client_data(int fd, const char *data, ssize_t sz,
int use_sideband)
{
if (use_sideband) {
send_sideband(1, fd, data, sz, use_sideband);
return;
}
if (fd == 3)
/* emergency quit */
fd = 2;
if (fd == 2) {
/* XXX: are we happy to lose stuff here? */
xwrite(fd, data, sz);
return;
}
write_or_die(fd, data, sz);
}
static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
{
FILE *fp = cb_data;
if (graft->nr_parent == -1)
fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
return 0;
}
struct output_state {
char buffer[8193];
int used;
unsigned packfile_uris_started : 1;
unsigned packfile_started : 1;
};
static int relay_pack_data(int pack_objects_out, struct output_state *os,
int use_sideband, int write_packfile_line)
{
/*
* We keep the last byte to ourselves
* in case we detect broken rev-list, so that we
* can leave the stream corrupted. This is
* unfortunate -- unpack-objects would happily
* accept a valid packdata with trailing garbage,
* so appending garbage after we pass all the
* pack data is not good enough to signal
* breakage to downstream.
*/
ssize_t readsz;
readsz = xread(pack_objects_out, os->buffer + os->used,
sizeof(os->buffer) - os->used);
if (readsz < 0) {
return readsz;
}
os->used += readsz;
while (!os->packfile_started) {
char *p;
if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
os->packfile_started = 1;
if (write_packfile_line) {
if (os->packfile_uris_started)
packet_delim(1);
packet_write_fmt(1, "\1packfile\n");
}
break;
}
if ((p = memchr(os->buffer, '\n', os->used))) {
if (!os->packfile_uris_started) {
os->packfile_uris_started = 1;
if (!write_packfile_line)
BUG("packfile_uris requires sideband-all");
packet_write_fmt(1, "\1packfile-uris\n");
}
*p = '\0';
packet_write_fmt(1, "\1%s\n", os->buffer);
os->used -= p - os->buffer + 1;
memmove(os->buffer, p + 1, os->used);
} else {
/*
* Incomplete line.
*/
return readsz;
}
}
if (os->used > 1) {
send_client_data(1, os->buffer, os->used - 1, use_sideband);
os->buffer[0] = os->buffer[os->used - 1];
os->used = 1;
} else {
send_client_data(1, os->buffer, os->used, use_sideband);
os->used = 0;
}
return readsz;
}
static void create_pack_file(struct upload_pack_data *pack_data,
const struct string_list *uri_protocols)
{
struct child_process pack_objects = CHILD_PROCESS_INIT;
struct output_state output_state = { { 0 } };
char progress[128];
char abort_msg[] = "aborting due to possible repository "
"corruption on the remote side.";
ssize_t sz;
int i;
FILE *pipe_fd;
if (!pack_data->pack_objects_hook)
pack_objects.git_cmd = 1;
else {
strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
strvec_push(&pack_objects.args, "git");
pack_objects.use_shell = 1;
}
if (pack_data->shallow_nr) {
strvec_push(&pack_objects.args, "--shallow-file");
strvec_push(&pack_objects.args, "");
}
strvec_push(&pack_objects.args, "pack-objects");
strvec_push(&pack_objects.args, "--revs");
if (pack_data->use_thin_pack)
strvec_push(&pack_objects.args, "--thin");
strvec_push(&pack_objects.args, "--stdout");
if (pack_data->shallow_nr)
strvec_push(&pack_objects.args, "--shallow");
if (!pack_data->no_progress)
strvec_push(&pack_objects.args, "--progress");
if (pack_data->use_ofs_delta)
strvec_push(&pack_objects.args, "--delta-base-offset");
if (pack_data->use_include_tag)
strvec_push(&pack_objects.args, "--include-tag");
if (pack_data->filter_options.choice) {
const char *spec =
expand_list_objects_filter_spec(&pack_data->filter_options);
if (pack_objects.use_shell) {
struct strbuf buf = STRBUF_INIT;
sq_quote_buf(&buf, spec);
strvec_pushf(&pack_objects.args, "--filter=%s", buf.buf);
strbuf_release(&buf);
} else {
strvec_pushf(&pack_objects.args, "--filter=%s", spec);
}
}
if (uri_protocols) {
for (i = 0; i < uri_protocols->nr; i++)
strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
uri_protocols->items[i].string);
}
pack_objects.in = -1;
pack_objects.out = -1;
pack_objects.err = -1;
if (start_command(&pack_objects))
die("git upload-pack: unable to fork git-pack-objects");
pipe_fd = xfdopen(pack_objects.in, "w");
if (pack_data->shallow_nr)
for_each_commit_graft(write_one_shallow, pipe_fd);
for (i = 0; i < pack_data->want_obj.nr; i++)
fprintf(pipe_fd, "%s\n",
oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
fprintf(pipe_fd, "--not\n");
for (i = 0; i < pack_data->have_obj.nr; i++)
fprintf(pipe_fd, "%s\n",
oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
fprintf(pipe_fd, "%s\n",
oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
fprintf(pipe_fd, "\n");
fflush(pipe_fd);
fclose(pipe_fd);
/* We read from pack_objects.err to capture stderr output for
* progress bar, and pack_objects.out to capture the pack data.
*/
while (1) {
struct pollfd pfd[2];
int pe, pu, pollsize, polltimeout;
int ret;
reset_timeout(pack_data->timeout);
pollsize = 0;
pe = pu = -1;
if (0 <= pack_objects.out) {
pfd[pollsize].fd = pack_objects.out;
pfd[pollsize].events = POLLIN;
pu = pollsize;
pollsize++;
}
if (0 <= pack_objects.err) {
pfd[pollsize].fd = pack_objects.err;
pfd[pollsize].events = POLLIN;
pe = pollsize;
pollsize++;
}
if (!pollsize)
break;
polltimeout = pack_data->keepalive < 0
? -1
: 1000 * pack_data->keepalive;
ret = poll(pfd, pollsize, polltimeout);
if (ret < 0) {
if (errno != EINTR) {
error_errno("poll failed, resuming");
sleep(1);
}
continue;
}
if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
/* Status ready; we ship that in the side-band
* or dump to the standard error.
*/
sz = xread(pack_objects.err, progress,
sizeof(progress));
if (0 < sz)
send_client_data(2, progress, sz,
pack_data->use_sideband);
else if (sz == 0) {
close(pack_objects.err);
pack_objects.err = -1;
}
else
goto fail;
/* give priority to status messages */
continue;
}
if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
int result = relay_pack_data(pack_objects.out,
&output_state,
pack_data->use_sideband,
!!uri_protocols);
if (result == 0) {
close(pack_objects.out);
pack_objects.out = -1;
} else if (result < 0) {
goto fail;
}
}
/*
* We hit the keepalive timeout without saying anything; send
* an empty message on the data sideband just to let the other
* side know we're still working on it, but don't have any data
* yet.
*
* If we don't have a sideband channel, there's no room in the
* protocol to say anything, so those clients are just out of
* luck.
*/
if (!ret && pack_data->use_sideband) {
static const char buf[] = "0005\1";
write_or_die(1, buf, 5);
}
}
if (finish_command(&pack_objects)) {
error("git upload-pack: git-pack-objects died with error.");
goto fail;
}
/* flush the data */
if (output_state.used > 0) {
send_client_data(1, output_state.buffer, output_state.used,
pack_data->use_sideband);
fprintf(stderr, "flushed.\n");
}
if (pack_data->use_sideband)
packet_flush(1);
return;
fail:
send_client_data(3, abort_msg, sizeof(abort_msg),
pack_data->use_sideband);
die("git upload-pack: %s", abort_msg);
}
static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
{
int we_knew_they_have = 0;
struct object *o = parse_object(the_repository, oid);
if (!o)
die("oops (%s)", oid_to_hex(oid));
if (o->type == OBJ_COMMIT) {
struct commit_list *parents;
struct commit *commit = (struct commit *)o;
if (o->flags & THEY_HAVE)
we_knew_they_have = 1;
else
o->flags |= THEY_HAVE;
if (!data->oldest_have || (commit->date < data->oldest_have))
data->oldest_have = commit->date;
for (parents = commit->parents;
parents;
parents = parents->next)
parents->item->object.flags |= THEY_HAVE;
}
if (!we_knew_they_have) {
add_object_array(o, NULL, &data->have_obj);
return 1;
}
return 0;
}
static int got_oid(struct upload_pack_data *data,
const char *hex, struct object_id *oid)
{
if (get_oid_hex(hex, oid))
die("git upload-pack: expected SHA1 object, got '%s'", hex);
if (!has_object_file_with_flags(oid,
OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
return -1;
return do_got_oid(data, oid);
}
static int ok_to_give_up(struct upload_pack_data *data)
{
uint32_t min_generation = GENERATION_NUMBER_ZERO;
if (!data->have_obj.nr)
return 0;
return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
COMMON_KNOWN, data->oldest_have,
min_generation);
}
static int get_common_commits(struct upload_pack_data *data,
struct packet_reader *reader)
{
struct object_id oid;
char last_hex[GIT_MAX_HEXSZ + 1];
int got_common = 0;
int got_other = 0;
int sent_ready = 0;
save_commit_buffer = 0;
for (;;) {
const char *arg;
reset_timeout(data->timeout);
if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
if (data->multi_ack == MULTI_ACK_DETAILED
&& got_common
&& !got_other
&& ok_to_give_up(data)) {
sent_ready = 1;
packet_write_fmt(1, "ACK %s ready\n", last_hex);
}
if (data->have_obj.nr == 0 || data->multi_ack)
packet_write_fmt(1, "NAK\n");
if (data->no_done && sent_ready) {
packet_write_fmt(1, "ACK %s\n", last_hex);
return 0;
}
if (data->stateless_rpc)
exit(0);
got_common = 0;
got_other = 0;
continue;
}
if (skip_prefix(reader->line, "have ", &arg)) {
switch (got_oid(data, arg, &oid)) {
case -1: /* they have what we do not */
got_other = 1;
if (data->multi_ack
&& ok_to_give_up(data)) {
const char *hex = oid_to_hex(&oid);
if (data->multi_ack == MULTI_ACK_DETAILED) {
sent_ready = 1;
packet_write_fmt(1, "ACK %s ready\n", hex);
} else
packet_write_fmt(1, "ACK %s continue\n", hex);
}
break;
default:
got_common = 1;
oid_to_hex_r(last_hex, &oid);
if (data->multi_ack == MULTI_ACK_DETAILED)
packet_write_fmt(1, "ACK %s common\n", last_hex);
else if (data->multi_ack)
packet_write_fmt(1, "ACK %s continue\n", last_hex);
else if (data->have_obj.nr == 1)
packet_write_fmt(1, "ACK %s\n", last_hex);
break;
}
continue;
}
if (!strcmp(reader->line, "done")) {
if (data->have_obj.nr > 0) {
if (data->multi_ack)
packet_write_fmt(1, "ACK %s\n", last_hex);
return 0;
}
packet_write_fmt(1, "NAK\n");
return -1;
}
die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
}
}
static int is_our_ref(struct object *o, enum allow_uor allow_uor)
{
int allow_hidden_ref = (allow_uor &
(ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
}
/*
* on successful case, it's up to the caller to close cmd->out
*/
static int do_reachable_revlist(struct child_process *cmd,
struct object_array *src,
struct object_array *reachable,
enum allow_uor allow_uor)
{
static const char *argv[] = {
"rev-list", "--stdin", NULL,
};
struct object *o;
FILE *cmd_in = NULL;
int i;
cmd->argv = argv;
cmd->git_cmd = 1;
cmd->no_stderr = 1;
cmd->in = -1;
cmd->out = -1;
/*
* If the next rev-list --stdin encounters an unknown commit,
* it terminates, which will cause SIGPIPE in the write loop
* below.
*/
sigchain_push(SIGPIPE, SIG_IGN);
if (start_command(cmd))
goto error;
cmd_in = xfdopen(cmd->in, "w");
for (i = get_max_object_index(); 0 < i; ) {
o = get_indexed_object(--i);
if (!o)
continue;
if (reachable && o->type == OBJ_COMMIT)
o->flags &= ~TMP_MARK;
if (!is_our_ref(o, allow_uor))
continue;
if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
goto error;
}
for (i = 0; i < src->nr; i++) {
o = src->objects[i].item;
if (is_our_ref(o, allow_uor)) {
if (reachable)
add_object_array(o, NULL, reachable);
continue;
}
if (reachable && o->type == OBJ_COMMIT)
o->flags |= TMP_MARK;
if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
goto error;
}
if (ferror(cmd_in) || fflush(cmd_in))
goto error;
fclose(cmd_in);
cmd->in = -1;
sigchain_pop(SIGPIPE);
return 0;
error:
sigchain_pop(SIGPIPE);
if (cmd_in)
fclose(cmd_in);
if (cmd->out >= 0)
close(cmd->out);
return -1;
}
static int get_reachable_list(struct upload_pack_data *data,
struct object_array *reachable)
{
struct child_process cmd = CHILD_PROCESS_INIT;
int i;
struct object *o;
char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
const unsigned hexsz = the_hash_algo->hexsz;
if (do_reachable_revlist(&cmd, &data->shallows, reachable,
data->allow_uor) < 0)
return -1;
while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
struct object_id oid;
const char *p;
if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
break;
o = lookup_object(the_repository, &oid);
if (o && o->type == OBJ_COMMIT) {
o->flags &= ~TMP_MARK;
}
}
for (i = get_max_object_index(); 0 < i; i--) {
o = get_indexed_object(i - 1);
if (o && o->type == OBJ_COMMIT &&
(o->flags & TMP_MARK)) {
add_object_array(o, NULL, reachable);
o->flags &= ~TMP_MARK;
}
}
close(cmd.out);
if (finish_command(&cmd))
return -1;
return 0;
}
static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
{
struct child_process cmd = CHILD_PROCESS_INIT;
char buf[1];
int i;
if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
return 1;
/*
* The commits out of the rev-list are not ancestors of
* our ref.
*/
i = read_in_full(cmd.out, buf, 1);
if (i)
goto error;
close(cmd.out);
cmd.out = -1;
/*
* rev-list may have died by encountering a bad commit
* in the history, in which case we do want to bail out
* even when it showed no commit.
*/
if (finish_command(&cmd))
goto error;
/* All the non-tip ones are ancestors of what we advertised */
return 0;
error:
if (cmd.out >= 0)
close(cmd.out);
return 1;
}
static void check_non_tip(struct upload_pack_data *data)
{
int i;
/*
* In the normal in-process case without
* uploadpack.allowReachableSHA1InWant,
* non-tip requests can never happen.
*/
if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
goto error;
if (!has_unreachable(&data->want_obj, data->allow_uor))
/* All the non-tip ones are ancestors of what we advertised */
return;
error:
/* Pick one of them (we know there at least is one) */
for (i = 0; i < data->want_obj.nr; i++) {
struct object *o = data->want_obj.objects[i].item;
if (!is_our_ref(o, data->allow_uor)) {
packet_writer_error(&data->writer,
"upload-pack: not our ref %s",
oid_to_hex(&o->oid));
die("git upload-pack: not our ref %s",
oid_to_hex(&o->oid));
}
}
}
static void send_shallow(struct upload_pack_data *data,
struct commit_list *result)
{
while (result) {
struct object *object = &result->item->object;
if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
packet_writer_write(&data->writer, "shallow %s",
oid_to_hex(&object->oid));
register_shallow(the_repository, &object->oid);
data->shallow_nr++;
}
result = result->next;
}
}
static void send_unshallow(struct upload_pack_data *data)
{
int i;
for (i = 0; i < data->shallows.nr; i++) {
struct object *object = data->shallows.objects[i].item;
if (object->flags & NOT_SHALLOW) {
struct commit_list *parents;
packet_writer_write(&data->writer, "unshallow %s",
oid_to_hex(&object->oid));
object->flags &= ~CLIENT_SHALLOW;
/*
* We want to _register_ "object" as shallow, but we
* also need to traverse object's parents to deepen a
* shallow clone. Unregister it for now so we can
* parse and add the parents to the want list, then
* re-register it.
*/
unregister_shallow(&object->oid);
object->parsed = 0;
parse_commit_or_die((struct commit *)object);
parents = ((struct commit *)object)->parents;
while (parents) {
add_object_array(&parents->item->object,
NULL, &data->want_obj);
parents = parents->next;
}
add_object_array(object, NULL, &data->extra_edge_obj);
}
/* make sure commit traversal conforms to client */
register_shallow(the_repository, &object->oid);
}
}
static int check_ref(const char *refname_full, const struct object_id *oid,
int flag, void *cb_data);
static void deepen(struct upload_pack_data *data, int depth)
{
if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
int i;
for (i = 0; i < data->shallows.nr; i++) {
struct object *object = data->shallows.objects[i].item;
object->flags |= NOT_SHALLOW;
}
} else if (data->deepen_relative) {
struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
struct commit_list *result;
/*
* Checking for reachable shallows requires that our refs be
* marked with OUR_REF.
*/
head_ref_namespaced(check_ref, NULL);
for_each_namespaced_ref(check_ref, NULL);
get_reachable_list(data, &reachable_shallows);
result = get_shallow_commits(&reachable_shallows,
depth + 1,
SHALLOW, NOT_SHALLOW);
send_shallow(data, result);
free_commit_list(result);
object_array_clear(&reachable_shallows);
} else {
struct commit_list *result;
result = get_shallow_commits(&data->want_obj, depth,
SHALLOW, NOT_SHALLOW);
send_shallow(data, result);
free_commit_list(result);
}
send_unshallow(data);
}
static void deepen_by_rev_list(struct upload_pack_data *data,
int ac,
const char **av)
{
struct commit_list *result;
disable_commit_graph(the_repository);
result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
send_shallow(data, result);
free_commit_list(result);
send_unshallow(data);
}
/* Returns 1 if a shallow list is sent or 0 otherwise */
static int send_shallow_list(struct upload_pack_data *data)
{
int ret = 0;
if (data->depth > 0 && data->deepen_rev_list)
die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
if (data->depth > 0) {
deepen(data, data->depth);
ret = 1;
} else if (data->deepen_rev_list) {
struct strvec av = STRVEC_INIT;
int i;
strvec_push(&av, "rev-list");
if (data->deepen_since)
strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
if (data->deepen_not.nr) {
strvec_push(&av, "--not");
for (i = 0; i < data->deepen_not.nr; i++) {
struct string_list_item *s = data->deepen_not.items + i;
strvec_push(&av, s->string);
}
strvec_push(&av, "--not");
}
for (i = 0; i < data->want_obj.nr; i++) {
struct object *o = data->want_obj.objects[i].item;
strvec_push(&av, oid_to_hex(&o->oid));
}
deepen_by_rev_list(data, av.nr, av.v);
strvec_clear(&av);
ret = 1;
} else {
if (data->shallows.nr > 0) {
int i;
for (i = 0; i < data->shallows.nr; i++)
register_shallow(the_repository,
&data->shallows.objects[i].item->oid);
}
}
data->shallow_nr += data->shallows.nr;
return ret;
}
static int process_shallow(const char *line, struct object_array *shallows)
{
const char *arg;
if (skip_prefix(line, "shallow ", &arg)) {
struct object_id oid;
struct object *object;
if (get_oid_hex(arg, &oid))
die("invalid shallow line: %s", line);
object = parse_object(the_repository, &oid);
if (!object)
return 1;
if (object->type != OBJ_COMMIT)
die("invalid shallow object %s", oid_to_hex(&oid));
if (!(object->flags & CLIENT_SHALLOW)) {
object->flags |= CLIENT_SHALLOW;
add_object_array(object, NULL, shallows);
}
return 1;
}
return 0;
}
static int process_deepen(const char *line, int *depth)
{
const char *arg;
if (skip_prefix(line, "deepen ", &arg)) {
char *end = NULL;
*depth = (int)strtol(arg, &end, 0);
if (!end || *end || *depth <= 0)
die("Invalid deepen: %s", line);
return 1;
}
return 0;
}
static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
{
const char *arg;
if (skip_prefix(line, "deepen-since ", &arg)) {
char *end = NULL;
*deepen_since = parse_timestamp(arg, &end, 0);
if (!end || *end || !deepen_since ||
/* revisions.c's max_age -1 is special */
*deepen_since == -1)
die("Invalid deepen-since: %s", line);
*deepen_rev_list = 1;
return 1;
}
return 0;
}
static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
{
const char *arg;
if (skip_prefix(line, "deepen-not ", &arg)) {
char *ref = NULL;
struct object_id oid;
if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
die("git upload-pack: ambiguous deepen-not: %s", line);
string_list_append(deepen_not, ref);
free(ref);
*deepen_rev_list = 1;
return 1;
}
return 0;
}
NORETURN __attribute__((format(printf,2,3)))
static void send_err_and_die(struct upload_pack_data *data,
const char *fmt, ...)
{
struct strbuf buf = STRBUF_INIT;
va_list ap;
va_start(ap, fmt);
strbuf_vaddf(&buf, fmt, ap);
va_end(ap);
packet_writer_error(&data->writer, "%s", buf.buf);
die("%s", buf.buf);
}
static void check_one_filter(struct upload_pack_data *data,
struct list_objects_filter_options *opts)
{
const char *key = list_object_filter_config_name(opts->choice);
struct string_list_item *item = string_list_lookup(&data->allowed_filters,
key);
int allowed;
if (item)
allowed = (intptr_t)item->util;
else
allowed = data->allow_filter_fallback;
if (!allowed)
send_err_and_die(data, "filter '%s' not supported", key);
if (opts->choice == LOFC_TREE_DEPTH &&
opts->tree_exclude_depth > data->tree_filter_max_depth)
send_err_and_die(data,
"tree filter allows max depth %lu, but got %lu",
data->tree_filter_max_depth,
opts->tree_exclude_depth);
}
static void check_filter_recurse(struct upload_pack_data *data,
struct list_objects_filter_options *opts)
{
size_t i;
check_one_filter(data, opts);
if (opts->choice != LOFC_COMBINE)
return;
for (i = 0; i < opts->sub_nr; i++)
check_filter_recurse(data, &opts->sub[i]);
}
static void die_if_using_banned_filter(struct upload_pack_data *data)
{
check_filter_recurse(data, &data->filter_options);
}
static void receive_needs(struct upload_pack_data *data,
struct packet_reader *reader)
{
int has_non_tip = 0;
data->shallow_nr = 0;
for (;;) {
struct object *o;
const char *features;
struct object_id oid_buf;
const char *arg;
reset_timeout(data->timeout);
if (packet_reader_read(reader) != PACKET_READ_NORMAL)
break;
if (process_shallow(reader->line, &data->shallows))
continue;
if (process_deepen(reader->line, &data->depth))
continue;
if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
continue;
if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
continue;
if (skip_prefix(reader->line, "filter ", &arg)) {
if (!data->filter_capability_requested)
die("git upload-pack: filtering capability not negotiated");
list_objects_filter_die_if_populated(&data->filter_options);
parse_list_objects_filter(&data->filter_options, arg);
die_if_using_banned_filter(data);
continue;
}
if (!skip_prefix(reader->line, "want ", &arg) ||
parse_oid_hex(arg, &oid_buf, &features))
die("git upload-pack: protocol error, "
"expected to get object ID, not '%s'", reader->line);
if (parse_feature_request(features, "deepen-relative"))
data->deepen_relative = 1;
if (parse_feature_request(features, "multi_ack_detailed"))
data->multi_ack = MULTI_ACK_DETAILED;
else if (parse_feature_request(features, "multi_ack"))
data->multi_ack = MULTI_ACK;
if (parse_feature_request(features, "no-done"))
data->no_done = 1;
if (parse_feature_request(features, "thin-pack"))
data->use_thin_pack = 1;
if (parse_feature_request(features, "ofs-delta"))
data->use_ofs_delta = 1;
if (parse_feature_request(features, "side-band-64k"))
data->use_sideband = LARGE_PACKET_MAX;
else if (parse_feature_request(features, "side-band"))
data->use_sideband = DEFAULT_PACKET_MAX;
if (parse_feature_request(features, "no-progress"))
data->no_progress = 1;
if (parse_feature_request(features, "include-tag"))
data->use_include_tag = 1;
if (data->allow_filter &&
parse_feature_request(features, "filter"))
data->filter_capability_requested = 1;
o = parse_object(the_repository, &oid_buf);
if (!o) {
packet_writer_error(&data->writer,
"upload-pack: not our ref %s",
oid_to_hex(&oid_buf));
die("git upload-pack: not our ref %s",
oid_to_hex(&oid_buf));
}
if (!(o->flags & WANTED)) {
o->flags |= WANTED;
if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
|| is_our_ref(o, data->allow_uor)))
has_non_tip = 1;
add_object_array(o, NULL, &data->want_obj);
}
}
/*
* We have sent all our refs already, and the other end
* should have chosen out of them. When we are operating
* in the stateless RPC mode, however, their choice may
* have been based on the set of older refs advertised
* by another process that handled the initial request.
*/
if (has_non_tip)
check_non_tip(data);
if (!data->use_sideband && data->daemon_mode)
data->no_progress = 1;
if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
return;
if (send_shallow_list(data))
packet_flush(1);
}
/* return non-zero if the ref is hidden, otherwise 0 */
static int mark_our_ref(const char *refname, const char *refname_full,
const struct object_id *oid)
{
struct object *o = lookup_unknown_object(oid);
if (ref_is_hidden(refname, refname_full)) {
o->flags |= HIDDEN_REF;
return 1;
}
o->flags |= OUR_REF;
return 0;
}
static int check_ref(const char *refname_full, const struct object_id *oid,
int flag, void *cb_data)
{
const char *refname = strip_namespace(refname_full);
mark_our_ref(refname, refname_full, oid);
return 0;
}
static void format_symref_info(struct strbuf *buf, struct string_list *symref)
{
struct string_list_item *item;
if (!symref->nr)
return;
for_each_string_list_item(item, symref)
strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
}
static int send_ref(const char *refname, const struct object_id *oid,
int flag, void *cb_data)
{
static const char *capabilities = "multi_ack thin-pack side-band"
" side-band-64k ofs-delta shallow deepen-since deepen-not"
" deepen-relative no-progress include-tag multi_ack_detailed";
const char *refname_nons = strip_namespace(refname);
struct object_id peeled;
struct upload_pack_data *data = cb_data;
if (mark_our_ref(refname_nons, refname, oid))
return 0;
if (capabilities) {
struct strbuf symref_info = STRBUF_INIT;
format_symref_info(&symref_info, &data->symref);
packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s object-format=%s agent=%s\n",
oid_to_hex(oid), refname_nons,
0, capabilities,
(data->allow_uor & ALLOW_TIP_SHA1) ?
" allow-tip-sha1-in-want" : "",
(data->allow_uor & ALLOW_REACHABLE_SHA1) ?
" allow-reachable-sha1-in-want" : "",
data->stateless_rpc ? " no-done" : "",
symref_info.buf,
data->allow_filter ? " filter" : "",
the_hash_algo->name,
git_user_agent_sanitized());
strbuf_release(&symref_info);
} else {
packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
}
capabilities = NULL;
if (!peel_ref(refname, &peeled))
packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
return 0;
}
static int find_symref(const char *refname, const struct object_id *oid,
int flag, void *cb_data)
{
const char *symref_target;
struct string_list_item *item;
if ((flag & REF_ISSYMREF) == 0)
return 0;
symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
if (!symref_target || (flag & REF_ISSYMREF) == 0)
die("'%s' is a symref but it is not?", refname);
item = string_list_append(cb_data, strip_namespace(refname));
item->util = xstrdup(strip_namespace(symref_target));
return 0;
}
static int parse_object_filter_config(const char *var, const char *value,
struct upload_pack_data *data)
{
struct strbuf buf = STRBUF_INIT;
const char *sub, *key;
size_t sub_len;
if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
return 0;
if (!sub) {
if (!strcmp(key, "allow"))
data->allow_filter_fallback = git_config_bool(var, value);
return 0;
}
strbuf_add(&buf, sub, sub_len);
if (!strcmp(key, "allow"))
string_list_insert(&data->allowed_filters, buf.buf)->util =
(void *)(intptr_t)git_config_bool(var, value);
else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
if (!value) {
strbuf_release(&buf);
return config_error_nonbool(var);
}
string_list_insert(&data->allowed_filters, buf.buf)->util =
(void *)(intptr_t)1;
data->tree_filter_max_depth = git_config_ulong(var, value);
}
strbuf_release(&buf);
return 0;
}
static int upload_pack_config(const char *var, const char *value, void *cb_data)
{
struct upload_pack_data *data = cb_data;
if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
if (git_config_bool(var, value))
data->allow_uor |= ALLOW_TIP_SHA1;
else
data->allow_uor &= ~ALLOW_TIP_SHA1;
} else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
if (git_config_bool(var, value))
data->allow_uor |= ALLOW_REACHABLE_SHA1;
else
data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
} else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
if (git_config_bool(var, value))
data->allow_uor |= ALLOW_ANY_SHA1;
else
data->allow_uor &= ~ALLOW_ANY_SHA1;
} else if (!strcmp("uploadpack.keepalive", var)) {
data->keepalive = git_config_int(var, value);
if (!data->keepalive)
data->keepalive = -1;
} else if (!strcmp("uploadpack.allowfilter", var)) {
data->allow_filter = git_config_bool(var, value);
} else if (!strcmp("uploadpack.allowrefinwant", var)) {
data->allow_ref_in_want = git_config_bool(var, value);
} else if (!strcmp("uploadpack.allowsidebandall", var)) {
data->allow_sideband_all = git_config_bool(var, value);
} else if (!strcmp("core.precomposeunicode", var)) {
precomposed_unicode = git_config_bool(var, value);
}
if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
current_config_scope() != CONFIG_SCOPE_WORKTREE) {
if (!strcmp("uploadpack.packobjectshook", var))
return git_config_string(&data->pack_objects_hook, var, value);
}
parse_object_filter_config(var, value, data);
return parse_hide_refs_config(var, value, "uploadpack");
}
void upload_pack(struct upload_pack_options *options)
{
struct packet_reader reader;
struct upload_pack_data data;
upload_pack_data_init(&data);
git_config(upload_pack_config, &data);
data.stateless_rpc = options->stateless_rpc;
data.daemon_mode = options->daemon_mode;
data.timeout = options->timeout;
head_ref_namespaced(find_symref, &data.symref);
if (options->advertise_refs || !data.stateless_rpc) {
reset_timeout(data.timeout);
head_ref_namespaced(send_ref, &data);
for_each_namespaced_ref(send_ref, &data);
advertise_shallow_grafts(1);
packet_flush(1);
} else {
head_ref_namespaced(check_ref, NULL);
for_each_namespaced_ref(check_ref, NULL);
}
if (!options->advertise_refs) {
packet_reader_init(&reader, 0, NULL, 0,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_DIE_ON_ERR_PACKET);
receive_needs(&data, &reader);
if (data.want_obj.nr) {
get_common_commits(&data, &reader);
create_pack_file(&data, NULL);
}
}
upload_pack_data_clear(&data);
}
static int parse_want(struct packet_writer *writer, const char *line,
struct object_array *want_obj)
{
const char *arg;
if (skip_prefix(line, "want ", &arg)) {
struct object_id oid;
struct object *o;
if (get_oid_hex(arg, &oid))
die("git upload-pack: protocol error, "
"expected to get oid, not '%s'", line);
o = parse_object(the_repository, &oid);
if (!o) {
packet_writer_error(writer,
"upload-pack: not our ref %s",
oid_to_hex(&oid));
die("git upload-pack: not our ref %s",
oid_to_hex(&oid));
}
if (!(o->flags & WANTED)) {
o->flags |= WANTED;
add_object_array(o, NULL, want_obj);
}
return 1;
}
return 0;
}
static int parse_want_ref(struct packet_writer *writer, const char *line,
struct string_list *wanted_refs,
struct object_array *want_obj)
{
const char *arg;
if (skip_prefix(line, "want-ref ", &arg)) {
struct object_id oid;
struct string_list_item *item;
struct object *o;
if (read_ref(arg, &oid)) {
packet_writer_error(writer, "unknown ref %s", arg);
die("unknown ref %s", arg);
}
item = string_list_append(wanted_refs, arg);
item->util = oiddup(&oid);
o = parse_object_or_die(&oid, arg);
if (!(o->flags & WANTED)) {
o->flags |= WANTED;
add_object_array(o, NULL, want_obj);
}
return 1;
}
return 0;
}
static int parse_have(const char *line, struct oid_array *haves)
{
const char *arg;
if (skip_prefix(line, "have ", &arg)) {
struct object_id oid;
if (get_oid_hex(arg, &oid))
die("git upload-pack: expected SHA1 object, got '%s'", arg);
oid_array_append(haves, &oid);
return 1;
}
return 0;
}
static void process_args(struct packet_reader *request,
struct upload_pack_data *data)
{
while (packet_reader_read(request) == PACKET_READ_NORMAL) {
const char *arg = request->line;
const char *p;
/* process want */
if (parse_want(&data->writer, arg, &data->want_obj))
continue;
if (data->allow_ref_in_want &&
parse_want_ref(&data->writer, arg, &data->wanted_refs,
&data->want_obj))
continue;
/* process have line */
if (parse_have(arg, &data->haves))
continue;
/* process args like thin-pack */
if (!strcmp(arg, "thin-pack")) {
data->use_thin_pack = 1;
continue;
}
if (!strcmp(arg, "ofs-delta")) {
data->use_ofs_delta = 1;
continue;
}
if (!strcmp(arg, "no-progress")) {
data->no_progress = 1;
continue;
}
if (!strcmp(arg, "include-tag")) {
data->use_include_tag = 1;
continue;
}
if (!strcmp(arg, "done")) {
data->done = 1;
continue;
}
/* Shallow related arguments */
if (process_shallow(arg, &data->shallows))
continue;
if (process_deepen(arg, &data->depth))
continue;
if (process_deepen_since(arg, &data->deepen_since,
&data->deepen_rev_list))
continue;
if (process_deepen_not(arg, &data->deepen_not,
&data->deepen_rev_list))
continue;
if (!strcmp(arg, "deepen-relative")) {
data->deepen_relative = 1;
continue;
}
if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
list_objects_filter_die_if_populated(&data->filter_options);
parse_list_objects_filter(&data->filter_options, p);
die_if_using_banned_filter(data);
continue;
}
if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
data->allow_sideband_all) &&
!strcmp(arg, "sideband-all")) {
data->writer.use_sideband = 1;
continue;
}
if (skip_prefix(arg, "packfile-uris ", &p)) {
string_list_split(&data->uri_protocols, p, ',', -1);
continue;
}
/* ignore unknown lines maybe? */
die("unexpected line: '%s'", arg);
}
if (data->uri_protocols.nr && !data->writer.use_sideband)
string_list_clear(&data->uri_protocols, 0);
if (request->status != PACKET_READ_FLUSH)
die(_("expected flush after fetch arguments"));
}
static int process_haves(struct upload_pack_data *data, struct oid_array *common)
{
int i;
/* Process haves */
for (i = 0; i < data->haves.nr; i++) {
const struct object_id *oid = &data->haves.oid[i];
if (!has_object_file_with_flags(oid,
OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
continue;
oid_array_append(common, oid);
do_got_oid(data, oid);
}
return 0;
}
static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
{
int i;
packet_writer_write(&data->writer, "acknowledgments\n");
/* Send Acks */
if (!acks->nr)
packet_writer_write(&data->writer, "NAK\n");
for (i = 0; i < acks->nr; i++) {
packet_writer_write(&data->writer, "ACK %s\n",
oid_to_hex(&acks->oid[i]));
}
if (ok_to_give_up(data)) {
/* Send Ready */
packet_writer_write(&data->writer, "ready\n");
return 1;
}
return 0;
}
static int process_haves_and_send_acks(struct upload_pack_data *data)
{
struct oid_array common = OID_ARRAY_INIT;
int ret = 0;
process_haves(data, &common);
if (data->done) {
ret = 1;
} else if (send_acks(data, &common)) {
packet_writer_delim(&data->writer);
ret = 1;
} else {
/* Add Flush */
packet_writer_flush(&data->writer);
ret = 0;
}
oid_array_clear(&data->haves);
oid_array_clear(&common);
return ret;
}
static void send_wanted_ref_info(struct upload_pack_data *data)
{
const struct string_list_item *item;
if (!data->wanted_refs.nr)
return;
packet_writer_write(&data->writer, "wanted-refs\n");
for_each_string_list_item(item, &data->wanted_refs) {
packet_writer_write(&data->writer, "%s %s\n",
oid_to_hex(item->util),
item->string);
}
packet_writer_delim(&data->writer);
}
static void send_shallow_info(struct upload_pack_data *data)
{
/* No shallow info needs to be sent */
if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
!is_repository_shallow(the_repository))
return;
packet_writer_write(&data->writer, "shallow-info\n");
if (!send_shallow_list(data) &&
is_repository_shallow(the_repository))
deepen(data, INFINITE_DEPTH);
packet_delim(1);
}
enum fetch_state {
FETCH_PROCESS_ARGS = 0,
FETCH_SEND_ACKS,
FETCH_SEND_PACK,
FETCH_DONE,
};
int upload_pack_v2(struct repository *r, struct strvec *keys,
struct packet_reader *request)
{
enum fetch_state state = FETCH_PROCESS_ARGS;
struct upload_pack_data data;
clear_object_flags(ALL_FLAGS);
upload_pack_data_init(&data);
data.use_sideband = LARGE_PACKET_MAX;
git_config(upload_pack_config, &data);
while (state != FETCH_DONE) {
switch (state) {
case FETCH_PROCESS_ARGS:
process_args(request, &data);
if (!data.want_obj.nr) {
/*
* Request didn't contain any 'want' lines,
* guess they didn't want anything.
*/
state = FETCH_DONE;
} else if (data.haves.nr) {
/*
* Request had 'have' lines, so lets ACK them.
*/
state = FETCH_SEND_ACKS;
} else {
/*
* Request had 'want's but no 'have's so we can
* immedietly go to construct and send a pack.
*/
state = FETCH_SEND_PACK;
}
break;
case FETCH_SEND_ACKS:
if (process_haves_and_send_acks(&data))
state = FETCH_SEND_PACK;
else
state = FETCH_DONE;
break;
case FETCH_SEND_PACK:
send_wanted_ref_info(&data);
send_shallow_info(&data);
if (data.uri_protocols.nr) {
create_pack_file(&data, &data.uri_protocols);
} else {
packet_writer_write(&data.writer, "packfile\n");
create_pack_file(&data, NULL);
}
state = FETCH_DONE;
break;
case FETCH_DONE:
continue;
}
}
upload_pack_data_clear(&data);
return 0;
}
int upload_pack_advertise(struct repository *r,
struct strbuf *value)
{
if (value) {
int allow_filter_value;
int allow_ref_in_want;
int allow_sideband_all_value;
char *str = NULL;
strbuf_addstr(value, "shallow");
if (!repo_config_get_bool(the_repository,
"uploadpack.allowfilter",
&allow_filter_value) &&
allow_filter_value)
strbuf_addstr(value, " filter");
if (!repo_config_get_bool(the_repository,
"uploadpack.allowrefinwant",
&allow_ref_in_want) &&
allow_ref_in_want)
strbuf_addstr(value, " ref-in-want");
if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
(!repo_config_get_bool(the_repository,
"uploadpack.allowsidebandall",
&allow_sideband_all_value) &&
allow_sideband_all_value))
strbuf_addstr(value, " sideband-all");
if (!repo_config_get_string(the_repository,
"uploadpack.blobpackfileuri",
&str) &&
str) {
strbuf_addstr(value, " packfile-uris");
free(str);
}
}
return 1;
}
