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git/upload-pack.c
Jeff King 36a317929b refs: switch peel_ref() to peel_iterated_oid() 
The peel_ref() interface is confusing and error-prone:

  - it's typically used by ref iteration callbacks that have both a
    refname and oid. But since they pass only the refname, we may load
    the ref value from the filesystem again. This is inefficient, but
    also means we are open to a race if somebody simultaneously updates
    the ref. E.g., this:

      int some_ref_cb(const char *refname, const struct object_id *oid, ...)
      {
              if (!peel_ref(refname, &peeled))
                      printf("%s peels to %s",
                             oid_to_hex(oid), oid_to_hex(&peeled);
      }

    could print nonsense. It is correct to say "refname peels to..."
    (you may see the "before" value or the "after" value, either of
    which is consistent), but mentioning both oids may be mixing
    before/after values.

    Worse, whether this is possible depends on whether the optimization
    to read from the current iterator value kicks in. So it is actually
    not possible with:

      for_each_ref(some_ref_cb);

    but it _is_ possible with:

      head_ref(some_ref_cb);

    which does not use the iterator mechanism (though in practice, HEAD
    should never peel to anything, so this may not be triggerable).

  - it must take a fully-qualified refname for the read_ref_full() code
    path to work. Yet we routinely pass it partial refnames from
    callbacks to for_each_tag_ref(), etc. This happens to work when
    iterating because there we do not call read_ref_full() at all, and
    only use the passed refname to check if it is the same as the
    iterator. But the requirements for the function parameters are quite
    unclear.

Instead of taking a refname, let's instead take an oid. That fixes both
problems. It's a little funny for a "ref" function not to involve refs
at all. The key thing is that it's optimizing under the hood based on
having access to the ref iterator. So let's change the name to make it
clear why you'd want this function versus just peel_object().

There are two other directions I considered but rejected:

  - we could pass the peel information into the each_ref_fn callback.
    However, we don't know if the caller actually wants it or not. For
    packed-refs, providing it is essentially free. But for loose refs,
    we actually have to peel the object, which would be wasteful in most
    cases. We could likewise pass in a flag to the callback indicating
    whether the peeled information is known, but that complicates those
    callbacks, as they then have to decide whether to manually peel
    themselves. Plus it requires changing the interface of every
    callback, whether they care about peeling or not, and there are many
    of them.

  - we could make a function to return the peeled value of the current
    iterated ref (computing it if necessary), and BUG() otherwise. I.e.:

      int peel_current_iterated_ref(struct object_id *out);

    Each of the current callers is an each_ref_fn callback, so they'd
    mostly be happy. But:

      - we use those callbacks with functions like head_ref(), which do
        not use the iteration code. So we'd need to handle the fallback
        case there, anyway.

      - it's possible that a caller would want to call into generic code
        that sometimes is used during iteration and sometimes not. This
        encapsulates the logic to do the fast thing when possible, and
        fallback when necessary.

The implementation is mostly obvious, but I want to call out a few
things in the patch:

  - the test-tool coverage for peel_ref() is now meaningless, as it all
    collapses to a single peel_object() call (arguably they were pretty
    uninteresting before; the tricky part of that function is the
    fast-path we see during iteration, but these calls didn't trigger
    that). I've just dropped it entirely, though note that some other
    tests relied on the tags we created; I've moved that creation to the
    tests where it matters.

  - we no longer need to take a ref_store parameter, since we'd never
    look up a ref now. We do still rely on a global "current iterator"
    variable which _could_ be kept per-ref-store. But in practice this
    is only useful if there are multiple recursive iterations, at which
    point the more appropriate solution is probably a stack of
    iterators. No caller used the actual ref-store parameter anyway
    (they all call the wrapper that passes the_repository).

  - the original only kicked in the optimization when the "refname"
    pointer matched (i.e., not string comparison). We do likewise with
    the "oid" parameter here, but fall back to doing an actual oideq()
    call. This in theory lets us kick in the optimization more often,
    though in practice no current caller cares. It should never be
    wrong, though (peeling is a property of an object, so two refs
    pointing to the same object would peel identically).

  - the original took care not to touch the peeled out-parameter unless
    we found something to put in it. But no caller cares about this, and
    anyway, it is enforced by peel_object() itself (and even in the
    optimized iterator case, that's where we eventually end up). We can
    shorten the code and avoid an extra copy by just passing the
    out-parameter through the stack.

Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-21 15:51:31 -08:00

1764 lines
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#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 */
unsigned advertise_sid : 1;
};
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;
data->advertise_sid = 0;
}
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, 0);
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;
pack_objects.clean_on_exit = 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;
int feature_len;
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;
arg = parse_feature_value(features, "session-id", &feature_len, NULL);
if (arg) {
char *client_sid = xstrndup(arg, feature_len);
trace2_data_string("transfer", NULL, "client-sid", client_sid);
free(client_sid);
}
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 void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
if (d->advertise_sid)
strbuf_addf(buf, " session-id=%s", trace2_session_id());
}
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;
struct strbuf session_id = STRBUF_INIT;
format_symref_info(&symref_info, &data->symref);
format_session_id(&session_id, data);
packet_write_fmt(1, "%s %s%c%s%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" : "",
session_id.buf,
the_hash_algo->name,
git_user_agent_sanitized());
strbuf_release(&symref_info);
strbuf_release(&session_id);
} else {
packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
}
capabilities = NULL;
if (!peel_iterated_oid(oid, &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);
} else if (!strcmp("transfer.advertisesid", var)) {
data->advertise_sid = 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);
}
if (parse_object_filter_config(var, value, data) < 0)
return -1;
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);
/*
* An EOF at this exact point in negotiation should be
* acceptable from stateless clients as they will consume the
* shallow list before doing subsequent rpc with haves/etc.
*/
if (data.stateless_rpc)
reader.options |= PACKET_READ_GENTLE_ON_EOF;
if (data.want_obj.nr &&
packet_reader_peek(&reader) != PACKET_READ_EOF) {
reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
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;
}
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