2 #include "repository.h"
12 #include "fetch-pack.h"
14 #include "run-command.h"
16 #include "transport.h"
18 #include "sha1-array.h"
21 #include "object-store.h"
22 #include "connected.h"
23 #include "fetch-negotiator.h"
25 static int transfer_unpack_limit
= -1;
26 static int fetch_unpack_limit
= -1;
27 static int unpack_limit
= 100;
28 static int prefer_ofs_delta
= 1;
30 static int deepen_since_ok
;
31 static int deepen_not_ok
;
32 static int fetch_fsck_objects
= -1;
33 static int transfer_fsck_objects
= -1;
34 static int agent_supported
;
35 static int server_supports_filtering
;
36 static struct lock_file shallow_lock
;
37 static const char *alternate_shallow_file
;
39 /* Remember to update object flag allocation in object.h */
40 #define COMPLETE (1U << 0)
41 #define ALTERNATE (1U << 1)
44 * After sending this many "have"s if we do not get any new ACK , we
45 * give up traversing our history.
47 #define MAX_IN_VAIN 256
49 static int multi_ack
, use_sideband
;
50 /* Allow specifying sha1 if it is a ref tip. */
51 #define ALLOW_TIP_SHA1 01
52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
53 #define ALLOW_REACHABLE_SHA1 02
54 static unsigned int allow_unadvertised_object_request
;
56 __attribute__((format (printf
, 2, 3)))
57 static inline void print_verbose(const struct fetch_pack_args
*args
,
65 va_start(params
, fmt
);
66 vfprintf(stderr
, fmt
, params
);
71 struct alternate_object_cache
{
72 struct object
**items
;
76 static void cache_one_alternate(const char *refname
,
77 const struct object_id
*oid
,
80 struct alternate_object_cache
*cache
= vcache
;
81 struct object
*obj
= parse_object(the_repository
, oid
);
83 if (!obj
|| (obj
->flags
& ALTERNATE
))
86 obj
->flags
|= ALTERNATE
;
87 ALLOC_GROW(cache
->items
, cache
->nr
+ 1, cache
->alloc
);
88 cache
->items
[cache
->nr
++] = obj
;
91 static void for_each_cached_alternate(struct fetch_negotiator
*negotiator
,
92 void (*cb
)(struct fetch_negotiator
*,
95 static int initialized
;
96 static struct alternate_object_cache cache
;
100 for_each_alternate_ref(cache_one_alternate
, &cache
);
104 for (i
= 0; i
< cache
.nr
; i
++)
105 cb(negotiator
, cache
.items
[i
]);
108 static int rev_list_insert_ref(struct fetch_negotiator
*negotiator
,
110 const struct object_id
*oid
)
112 struct object
*o
= deref_tag(the_repository
,
113 parse_object(the_repository
, oid
),
116 if (o
&& o
->type
== OBJ_COMMIT
)
117 negotiator
->add_tip(negotiator
, (struct commit
*)o
);
122 static int rev_list_insert_ref_oid(const char *refname
, const struct object_id
*oid
,
123 int flag
, void *cb_data
)
125 return rev_list_insert_ref(cb_data
, refname
, oid
);
136 static void consume_shallow_list(struct fetch_pack_args
*args
, int fd
)
138 if (args
->stateless_rpc
&& args
->deepen
) {
139 /* If we sent a depth we will get back "duplicate"
140 * shallow and unshallow commands every time there
141 * is a block of have lines exchanged.
144 while ((line
= packet_read_line(fd
, NULL
))) {
145 if (starts_with(line
, "shallow "))
147 if (starts_with(line
, "unshallow "))
149 die(_("git fetch-pack: expected shallow list"));
154 static enum ack_type
get_ack(int fd
, struct object_id
*result_oid
)
157 char *line
= packet_read_line(fd
, &len
);
161 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
162 if (!strcmp(line
, "NAK"))
164 if (skip_prefix(line
, "ACK ", &arg
)) {
165 if (!get_oid_hex(arg
, result_oid
)) {
170 if (strstr(arg
, "continue"))
172 if (strstr(arg
, "common"))
174 if (strstr(arg
, "ready"))
179 if (skip_prefix(line
, "ERR ", &arg
))
180 die(_("remote error: %s"), arg
);
181 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), line
);
184 static void send_request(struct fetch_pack_args
*args
,
185 int fd
, struct strbuf
*buf
)
187 if (args
->stateless_rpc
) {
188 send_sideband(fd
, -1, buf
->buf
, buf
->len
, LARGE_PACKET_MAX
);
191 write_or_die(fd
, buf
->buf
, buf
->len
);
194 static void insert_one_alternate_object(struct fetch_negotiator
*negotiator
,
197 rev_list_insert_ref(negotiator
, NULL
, &obj
->oid
);
200 #define INITIAL_FLUSH 16
201 #define PIPESAFE_FLUSH 32
202 #define LARGE_FLUSH 16384
204 static int next_flush(int stateless_rpc
, int count
)
207 if (count
< LARGE_FLUSH
)
210 count
= count
* 11 / 10;
212 if (count
< PIPESAFE_FLUSH
)
215 count
+= PIPESAFE_FLUSH
;
220 static void mark_tips(struct fetch_negotiator
*negotiator
,
221 const struct oid_array
*negotiation_tips
)
225 if (!negotiation_tips
) {
226 for_each_ref(rev_list_insert_ref_oid
, negotiator
);
230 for (i
= 0; i
< negotiation_tips
->nr
; i
++)
231 rev_list_insert_ref(negotiator
, NULL
,
232 &negotiation_tips
->oid
[i
]);
236 static int find_common(struct fetch_negotiator
*negotiator
,
237 struct fetch_pack_args
*args
,
238 int fd
[2], struct object_id
*result_oid
,
242 int count
= 0, flushes
= 0, flush_at
= INITIAL_FLUSH
, retval
;
243 const struct object_id
*oid
;
244 unsigned in_vain
= 0;
245 int got_continue
= 0;
247 struct strbuf req_buf
= STRBUF_INIT
;
248 size_t state_len
= 0;
250 if (args
->stateless_rpc
&& multi_ack
== 1)
251 die(_("--stateless-rpc requires multi_ack_detailed"));
253 mark_tips(negotiator
, args
->negotiation_tips
);
254 for_each_cached_alternate(negotiator
, insert_one_alternate_object
);
257 for ( ; refs
; refs
= refs
->next
) {
258 struct object_id
*remote
= &refs
->old_oid
;
259 const char *remote_hex
;
263 * If that object is complete (i.e. it is an ancestor of a
264 * local ref), we tell them we have it but do not have to
265 * tell them about its ancestors, which they already know
268 * We use lookup_object here because we are only
269 * interested in the case we *know* the object is
270 * reachable and we have already scanned it.
272 if (((o
= lookup_object(the_repository
, remote
->hash
)) != NULL
) &&
273 (o
->flags
& COMPLETE
)) {
277 remote_hex
= oid_to_hex(remote
);
279 struct strbuf c
= STRBUF_INIT
;
280 if (multi_ack
== 2) strbuf_addstr(&c
, " multi_ack_detailed");
281 if (multi_ack
== 1) strbuf_addstr(&c
, " multi_ack");
282 if (no_done
) strbuf_addstr(&c
, " no-done");
283 if (use_sideband
== 2) strbuf_addstr(&c
, " side-band-64k");
284 if (use_sideband
== 1) strbuf_addstr(&c
, " side-band");
285 if (args
->deepen_relative
) strbuf_addstr(&c
, " deepen-relative");
286 if (args
->use_thin_pack
) strbuf_addstr(&c
, " thin-pack");
287 if (args
->no_progress
) strbuf_addstr(&c
, " no-progress");
288 if (args
->include_tag
) strbuf_addstr(&c
, " include-tag");
289 if (prefer_ofs_delta
) strbuf_addstr(&c
, " ofs-delta");
290 if (deepen_since_ok
) strbuf_addstr(&c
, " deepen-since");
291 if (deepen_not_ok
) strbuf_addstr(&c
, " deepen-not");
292 if (agent_supported
) strbuf_addf(&c
, " agent=%s",
293 git_user_agent_sanitized());
294 if (args
->filter_options
.choice
)
295 strbuf_addstr(&c
, " filter");
296 packet_buf_write(&req_buf
, "want %s%s\n", remote_hex
, c
.buf
);
299 packet_buf_write(&req_buf
, "want %s\n", remote_hex
);
304 strbuf_release(&req_buf
);
309 if (is_repository_shallow(the_repository
))
310 write_shallow_commits(&req_buf
, 1, NULL
);
312 packet_buf_write(&req_buf
, "deepen %d", args
->depth
);
313 if (args
->deepen_since
) {
314 timestamp_t max_age
= approxidate(args
->deepen_since
);
315 packet_buf_write(&req_buf
, "deepen-since %"PRItime
, max_age
);
317 if (args
->deepen_not
) {
319 for (i
= 0; i
< args
->deepen_not
->nr
; i
++) {
320 struct string_list_item
*s
= args
->deepen_not
->items
+ i
;
321 packet_buf_write(&req_buf
, "deepen-not %s", s
->string
);
324 if (server_supports_filtering
&& args
->filter_options
.choice
)
325 packet_buf_write(&req_buf
, "filter %s",
326 args
->filter_options
.filter_spec
);
327 packet_buf_flush(&req_buf
);
328 state_len
= req_buf
.len
;
333 struct object_id oid
;
335 send_request(args
, fd
[1], &req_buf
);
336 while ((line
= packet_read_line(fd
[0], NULL
))) {
337 if (skip_prefix(line
, "shallow ", &arg
)) {
338 if (get_oid_hex(arg
, &oid
))
339 die(_("invalid shallow line: %s"), line
);
340 register_shallow(the_repository
, &oid
);
343 if (skip_prefix(line
, "unshallow ", &arg
)) {
344 if (get_oid_hex(arg
, &oid
))
345 die(_("invalid unshallow line: %s"), line
);
346 if (!lookup_object(the_repository
, oid
.hash
))
347 die(_("object not found: %s"), line
);
348 /* make sure that it is parsed as shallow */
349 if (!parse_object(the_repository
, &oid
))
350 die(_("error in object: %s"), line
);
351 if (unregister_shallow(&oid
))
352 die(_("no shallow found: %s"), line
);
355 die(_("expected shallow/unshallow, got %s"), line
);
357 } else if (!args
->stateless_rpc
)
358 send_request(args
, fd
[1], &req_buf
);
360 if (!args
->stateless_rpc
) {
361 /* If we aren't using the stateless-rpc interface
362 * we don't need to retain the headers.
364 strbuf_setlen(&req_buf
, 0);
370 if (args
->no_dependents
)
372 while ((oid
= negotiator
->next(negotiator
))) {
373 packet_buf_write(&req_buf
, "have %s\n", oid_to_hex(oid
));
374 print_verbose(args
, "have %s", oid_to_hex(oid
));
376 if (flush_at
<= ++count
) {
379 packet_buf_flush(&req_buf
);
380 send_request(args
, fd
[1], &req_buf
);
381 strbuf_setlen(&req_buf
, state_len
);
383 flush_at
= next_flush(args
->stateless_rpc
, count
);
386 * We keep one window "ahead" of the other side, and
387 * will wait for an ACK only on the next one
389 if (!args
->stateless_rpc
&& count
== INITIAL_FLUSH
)
392 consume_shallow_list(args
, fd
[0]);
394 ack
= get_ack(fd
[0], result_oid
);
396 print_verbose(args
, _("got %s %d %s"), "ack",
397 ack
, oid_to_hex(result_oid
));
407 struct commit
*commit
=
408 lookup_commit(the_repository
,
413 die(_("invalid commit %s"), oid_to_hex(result_oid
));
414 was_common
= negotiator
->ack(negotiator
, commit
);
415 if (args
->stateless_rpc
418 /* We need to replay the have for this object
419 * on the next RPC request so the peer knows
420 * it is in common with us.
422 const char *hex
= oid_to_hex(result_oid
);
423 packet_buf_write(&req_buf
, "have %s\n", hex
);
424 state_len
= req_buf
.len
;
426 * Reset in_vain because an ack
427 * for this commit has not been
431 } else if (!args
->stateless_rpc
432 || ack
!= ACK_common
)
436 if (ack
== ACK_ready
)
443 if (got_continue
&& MAX_IN_VAIN
< in_vain
) {
444 print_verbose(args
, _("giving up"));
452 if (!got_ready
|| !no_done
) {
453 packet_buf_write(&req_buf
, "done\n");
454 send_request(args
, fd
[1], &req_buf
);
456 print_verbose(args
, _("done"));
461 strbuf_release(&req_buf
);
463 if (!got_ready
|| !no_done
)
464 consume_shallow_list(args
, fd
[0]);
465 while (flushes
|| multi_ack
) {
466 int ack
= get_ack(fd
[0], result_oid
);
468 print_verbose(args
, _("got %s (%d) %s"), "ack",
469 ack
, oid_to_hex(result_oid
));
477 /* it is no error to fetch into a completely empty repo */
478 return count
? retval
: 0;
481 static struct commit_list
*complete
;
483 static int mark_complete(const struct object_id
*oid
)
485 struct object
*o
= parse_object(the_repository
, oid
);
487 while (o
&& o
->type
== OBJ_TAG
) {
488 struct tag
*t
= (struct tag
*) o
;
490 break; /* broken repository */
491 o
->flags
|= COMPLETE
;
492 o
= parse_object(the_repository
, &t
->tagged
->oid
);
494 if (o
&& o
->type
== OBJ_COMMIT
) {
495 struct commit
*commit
= (struct commit
*)o
;
496 if (!(commit
->object
.flags
& COMPLETE
)) {
497 commit
->object
.flags
|= COMPLETE
;
498 commit_list_insert(commit
, &complete
);
504 static int mark_complete_oid(const char *refname
, const struct object_id
*oid
,
505 int flag
, void *cb_data
)
507 return mark_complete(oid
);
510 static void mark_recent_complete_commits(struct fetch_pack_args
*args
,
513 while (complete
&& cutoff
<= complete
->item
->date
) {
514 print_verbose(args
, _("Marking %s as complete"),
515 oid_to_hex(&complete
->item
->object
.oid
));
516 pop_most_recent_commit(&complete
, COMPLETE
);
520 static void add_refs_to_oidset(struct oidset
*oids
, struct ref
*refs
)
522 for (; refs
; refs
= refs
->next
)
523 oidset_insert(oids
, &refs
->old_oid
);
526 static int tip_oids_contain(struct oidset
*tip_oids
,
527 struct ref
*unmatched
, struct ref
*newlist
,
528 const struct object_id
*id
)
531 * Note that this only looks at the ref lists the first time it's
532 * called. This works out in filter_refs() because even though it may
533 * add to "newlist" between calls, the additions will always be for
534 * oids that are already in the set.
536 if (!tip_oids
->map
.map
.tablesize
) {
537 add_refs_to_oidset(tip_oids
, unmatched
);
538 add_refs_to_oidset(tip_oids
, newlist
);
540 return oidset_contains(tip_oids
, id
);
543 static void filter_refs(struct fetch_pack_args
*args
,
545 struct ref
**sought
, int nr_sought
)
547 struct ref
*newlist
= NULL
;
548 struct ref
**newtail
= &newlist
;
549 struct ref
*unmatched
= NULL
;
550 struct ref
*ref
, *next
;
551 struct oidset tip_oids
= OIDSET_INIT
;
555 for (ref
= *refs
; ref
; ref
= next
) {
559 if (starts_with(ref
->name
, "refs/") &&
560 check_refname_format(ref
->name
, 0))
563 while (i
< nr_sought
) {
564 int cmp
= strcmp(ref
->name
, sought
[i
]->name
);
566 break; /* definitely do not have it */
568 keep
= 1; /* definitely have it */
569 sought
[i
]->match_status
= REF_MATCHED
;
574 if (!keep
&& args
->fetch_all
&&
575 (!args
->deepen
|| !starts_with(ref
->name
, "refs/tags/")))
582 newtail
= &ref
->next
;
584 ref
->next
= unmatched
;
589 /* Append unmatched requests to the list */
590 for (i
= 0; i
< nr_sought
; i
++) {
591 struct object_id oid
;
595 if (ref
->match_status
!= REF_NOT_MATCHED
)
597 if (parse_oid_hex(ref
->name
, &oid
, &p
) ||
599 oidcmp(&oid
, &ref
->old_oid
))
602 if ((allow_unadvertised_object_request
&
603 (ALLOW_TIP_SHA1
| ALLOW_REACHABLE_SHA1
)) ||
604 tip_oids_contain(&tip_oids
, unmatched
, newlist
,
606 ref
->match_status
= REF_MATCHED
;
607 *newtail
= copy_ref(ref
);
608 newtail
= &(*newtail
)->next
;
610 ref
->match_status
= REF_UNADVERTISED_NOT_ALLOWED
;
614 oidset_clear(&tip_oids
);
615 for (ref
= unmatched
; ref
; ref
= next
) {
623 static void mark_alternate_complete(struct fetch_negotiator
*unused
,
626 mark_complete(&obj
->oid
);
629 struct loose_object_iter
{
630 struct oidset
*loose_object_set
;
635 * If the number of refs is not larger than the number of loose objects,
636 * this function stops inserting.
638 static int add_loose_objects_to_set(const struct object_id
*oid
,
642 struct loose_object_iter
*iter
= data
;
643 oidset_insert(iter
->loose_object_set
, oid
);
644 if (iter
->refs
== NULL
)
647 iter
->refs
= iter
->refs
->next
;
652 * Mark recent commits available locally and reachable from a local ref as
653 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
654 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
655 * thus do not need COMMON_REF marks).
657 * The cutoff time for recency is determined by this heuristic: it is the
658 * earliest commit time of the objects in refs that are commits and that we know
659 * the commit time of.
661 static void mark_complete_and_common_ref(struct fetch_negotiator
*negotiator
,
662 struct fetch_pack_args
*args
,
666 int old_save_commit_buffer
= save_commit_buffer
;
667 timestamp_t cutoff
= 0;
668 struct oidset loose_oid_set
= OIDSET_INIT
;
670 struct loose_object_iter iter
= {&loose_oid_set
, *refs
};
672 /* Enumerate all loose objects or know refs are not so many. */
673 use_oidset
= !for_each_loose_object(add_loose_objects_to_set
,
676 save_commit_buffer
= 0;
678 for (ref
= *refs
; ref
; ref
= ref
->next
) {
680 unsigned int flags
= OBJECT_INFO_QUICK
;
683 !oidset_contains(&loose_oid_set
, &ref
->old_oid
)) {
685 * I know this does not exist in the loose form,
686 * so check if it exists in a non-loose form.
688 flags
|= OBJECT_INFO_IGNORE_LOOSE
;
691 if (!has_object_file_with_flags(&ref
->old_oid
, flags
))
693 o
= parse_object(the_repository
, &ref
->old_oid
);
697 /* We already have it -- which may mean that we were
698 * in sync with the other side at some time after
699 * that (it is OK if we guess wrong here).
701 if (o
->type
== OBJ_COMMIT
) {
702 struct commit
*commit
= (struct commit
*)o
;
703 if (!cutoff
|| cutoff
< commit
->date
)
704 cutoff
= commit
->date
;
708 oidset_clear(&loose_oid_set
);
710 if (!args
->no_dependents
) {
712 for_each_ref(mark_complete_oid
, NULL
);
713 for_each_cached_alternate(NULL
, mark_alternate_complete
);
714 commit_list_sort_by_date(&complete
);
716 mark_recent_complete_commits(args
, cutoff
);
720 * Mark all complete remote refs as common refs.
721 * Don't mark them common yet; the server has to be told so first.
723 for (ref
= *refs
; ref
; ref
= ref
->next
) {
724 struct object
*o
= deref_tag(the_repository
,
725 lookup_object(the_repository
,
729 if (!o
|| o
->type
!= OBJ_COMMIT
|| !(o
->flags
& COMPLETE
))
732 negotiator
->known_common(negotiator
,
737 save_commit_buffer
= old_save_commit_buffer
;
741 * Returns 1 if every object pointed to by the given remote refs is available
742 * locally and reachable from a local ref, and 0 otherwise.
744 static int everything_local(struct fetch_pack_args
*args
,
750 for (retval
= 1, ref
= *refs
; ref
; ref
= ref
->next
) {
751 const struct object_id
*remote
= &ref
->old_oid
;
754 o
= lookup_object(the_repository
, remote
->hash
);
755 if (!o
|| !(o
->flags
& COMPLETE
)) {
757 print_verbose(args
, "want %s (%s)", oid_to_hex(remote
),
761 print_verbose(args
, _("already have %s (%s)"), oid_to_hex(remote
),
768 static int sideband_demux(int in
, int out
, void *data
)
773 ret
= recv_sideband("fetch-pack", xd
[0], out
);
778 static int get_pack(struct fetch_pack_args
*args
,
779 int xd
[2], char **pack_lockfile
)
782 int do_keep
= args
->keep_pack
;
783 const char *cmd_name
;
784 struct pack_header header
;
786 struct child_process cmd
= CHILD_PROCESS_INIT
;
789 memset(&demux
, 0, sizeof(demux
));
791 /* xd[] is talking with upload-pack; subprocess reads from
792 * xd[0], spits out band#2 to stderr, and feeds us band#1
793 * through demux->out.
795 demux
.proc
= sideband_demux
;
798 demux
.isolate_sigpipe
= 1;
799 if (start_async(&demux
))
800 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
805 if (!args
->keep_pack
&& unpack_limit
) {
807 if (read_pack_header(demux
.out
, &header
))
808 die(_("protocol error: bad pack header"));
810 if (ntohl(header
.hdr_entries
) < unpack_limit
)
816 if (alternate_shallow_file
) {
817 argv_array_push(&cmd
.args
, "--shallow-file");
818 argv_array_push(&cmd
.args
, alternate_shallow_file
);
821 if (do_keep
|| args
->from_promisor
) {
824 cmd_name
= "index-pack";
825 argv_array_push(&cmd
.args
, cmd_name
);
826 argv_array_push(&cmd
.args
, "--stdin");
827 if (!args
->quiet
&& !args
->no_progress
)
828 argv_array_push(&cmd
.args
, "-v");
829 if (args
->use_thin_pack
)
830 argv_array_push(&cmd
.args
, "--fix-thin");
831 if (do_keep
&& (args
->lock_pack
|| unpack_limit
)) {
832 char hostname
[HOST_NAME_MAX
+ 1];
833 if (xgethostname(hostname
, sizeof(hostname
)))
834 xsnprintf(hostname
, sizeof(hostname
), "localhost");
835 argv_array_pushf(&cmd
.args
,
836 "--keep=fetch-pack %"PRIuMAX
" on %s",
837 (uintmax_t)getpid(), hostname
);
839 if (args
->check_self_contained_and_connected
)
840 argv_array_push(&cmd
.args
, "--check-self-contained-and-connected");
841 if (args
->from_promisor
)
842 argv_array_push(&cmd
.args
, "--promisor");
845 cmd_name
= "unpack-objects";
846 argv_array_push(&cmd
.args
, cmd_name
);
847 if (args
->quiet
|| args
->no_progress
)
848 argv_array_push(&cmd
.args
, "-q");
849 args
->check_self_contained_and_connected
= 0;
853 argv_array_pushf(&cmd
.args
, "--pack_header=%"PRIu32
",%"PRIu32
,
854 ntohl(header
.hdr_version
),
855 ntohl(header
.hdr_entries
));
856 if (fetch_fsck_objects
>= 0
858 : transfer_fsck_objects
>= 0
859 ? transfer_fsck_objects
861 if (args
->from_promisor
)
863 * We cannot use --strict in index-pack because it
864 * checks both broken objects and links, but we only
865 * want to check for broken objects.
867 argv_array_push(&cmd
.args
, "--fsck-objects");
869 argv_array_push(&cmd
.args
, "--strict");
874 if (start_command(&cmd
))
875 die(_("fetch-pack: unable to fork off %s"), cmd_name
);
876 if (do_keep
&& pack_lockfile
) {
877 *pack_lockfile
= index_pack_lockfile(cmd
.out
);
882 /* Closed by start_command() */
885 ret
= finish_command(&cmd
);
886 if (!ret
|| (args
->check_self_contained_and_connected
&& ret
== 1))
887 args
->self_contained_and_connected
=
888 args
->check_self_contained_and_connected
&&
891 die(_("%s failed"), cmd_name
);
892 if (use_sideband
&& finish_async(&demux
))
893 die(_("error in sideband demultiplexer"));
897 static int cmp_ref_by_name(const void *a_
, const void *b_
)
899 const struct ref
*a
= *((const struct ref
**)a_
);
900 const struct ref
*b
= *((const struct ref
**)b_
);
901 return strcmp(a
->name
, b
->name
);
904 static struct ref
*do_fetch_pack(struct fetch_pack_args
*args
,
906 const struct ref
*orig_ref
,
907 struct ref
**sought
, int nr_sought
,
908 struct shallow_info
*si
,
909 char **pack_lockfile
)
911 struct ref
*ref
= copy_ref_list(orig_ref
);
912 struct object_id oid
;
913 const char *agent_feature
;
915 struct fetch_negotiator negotiator
;
916 fetch_negotiator_init(&negotiator
);
918 sort_ref_list(&ref
, ref_compare_name
);
919 QSORT(sought
, nr_sought
, cmp_ref_by_name
);
921 if ((args
->depth
> 0 || is_repository_shallow(the_repository
)) && !server_supports("shallow"))
922 die(_("Server does not support shallow clients"));
923 if (args
->depth
> 0 || args
->deepen_since
|| args
->deepen_not
)
925 if (server_supports("multi_ack_detailed")) {
926 print_verbose(args
, _("Server supports multi_ack_detailed"));
928 if (server_supports("no-done")) {
929 print_verbose(args
, _("Server supports no-done"));
930 if (args
->stateless_rpc
)
934 else if (server_supports("multi_ack")) {
935 print_verbose(args
, _("Server supports multi_ack"));
938 if (server_supports("side-band-64k")) {
939 print_verbose(args
, _("Server supports side-band-64k"));
942 else if (server_supports("side-band")) {
943 print_verbose(args
, _("Server supports side-band"));
946 if (server_supports("allow-tip-sha1-in-want")) {
947 print_verbose(args
, _("Server supports allow-tip-sha1-in-want"));
948 allow_unadvertised_object_request
|= ALLOW_TIP_SHA1
;
950 if (server_supports("allow-reachable-sha1-in-want")) {
951 print_verbose(args
, _("Server supports allow-reachable-sha1-in-want"));
952 allow_unadvertised_object_request
|= ALLOW_REACHABLE_SHA1
;
954 if (!server_supports("thin-pack"))
955 args
->use_thin_pack
= 0;
956 if (!server_supports("no-progress"))
957 args
->no_progress
= 0;
958 if (!server_supports("include-tag"))
959 args
->include_tag
= 0;
960 if (server_supports("ofs-delta"))
961 print_verbose(args
, _("Server supports ofs-delta"));
963 prefer_ofs_delta
= 0;
965 if (server_supports("filter")) {
966 server_supports_filtering
= 1;
967 print_verbose(args
, _("Server supports filter"));
968 } else if (args
->filter_options
.choice
) {
969 warning("filtering not recognized by server, ignoring");
972 if ((agent_feature
= server_feature_value("agent", &agent_len
))) {
975 print_verbose(args
, _("Server version is %.*s"),
976 agent_len
, agent_feature
);
978 if (server_supports("deepen-since"))
980 else if (args
->deepen_since
)
981 die(_("Server does not support --shallow-since"));
982 if (server_supports("deepen-not"))
984 else if (args
->deepen_not
)
985 die(_("Server does not support --shallow-exclude"));
986 if (!server_supports("deepen-relative") && args
->deepen_relative
)
987 die(_("Server does not support --deepen"));
989 mark_complete_and_common_ref(&negotiator
, args
, &ref
);
990 filter_refs(args
, &ref
, sought
, nr_sought
);
991 if (everything_local(args
, &ref
)) {
995 if (find_common(&negotiator
, args
, fd
, &oid
, ref
) < 0)
996 if (!args
->keep_pack
)
997 /* When cloning, it is not unusual to have
1000 warning(_("no common commits"));
1002 if (args
->stateless_rpc
)
1003 packet_flush(fd
[1]);
1005 setup_alternate_shallow(&shallow_lock
, &alternate_shallow_file
,
1007 else if (si
->nr_ours
|| si
->nr_theirs
)
1008 alternate_shallow_file
= setup_temporary_shallow(si
->shallow
);
1010 alternate_shallow_file
= NULL
;
1011 if (get_pack(args
, fd
, pack_lockfile
))
1012 die(_("git fetch-pack: fetch failed."));
1015 negotiator
.release(&negotiator
);
1019 static void add_shallow_requests(struct strbuf
*req_buf
,
1020 const struct fetch_pack_args
*args
)
1022 if (is_repository_shallow(the_repository
))
1023 write_shallow_commits(req_buf
, 1, NULL
);
1024 if (args
->depth
> 0)
1025 packet_buf_write(req_buf
, "deepen %d", args
->depth
);
1026 if (args
->deepen_since
) {
1027 timestamp_t max_age
= approxidate(args
->deepen_since
);
1028 packet_buf_write(req_buf
, "deepen-since %"PRItime
, max_age
);
1030 if (args
->deepen_not
) {
1032 for (i
= 0; i
< args
->deepen_not
->nr
; i
++) {
1033 struct string_list_item
*s
= args
->deepen_not
->items
+ i
;
1034 packet_buf_write(req_buf
, "deepen-not %s", s
->string
);
1039 static void add_wants(const struct ref
*wants
, struct strbuf
*req_buf
)
1041 int use_ref_in_want
= server_supports_feature("fetch", "ref-in-want", 0);
1043 for ( ; wants
; wants
= wants
->next
) {
1044 const struct object_id
*remote
= &wants
->old_oid
;
1048 * If that object is complete (i.e. it is an ancestor of a
1049 * local ref), we tell them we have it but do not have to
1050 * tell them about its ancestors, which they already know
1053 * We use lookup_object here because we are only
1054 * interested in the case we *know* the object is
1055 * reachable and we have already scanned it.
1057 if (((o
= lookup_object(the_repository
, remote
->hash
)) != NULL
) &&
1058 (o
->flags
& COMPLETE
)) {
1062 if (!use_ref_in_want
|| wants
->exact_oid
)
1063 packet_buf_write(req_buf
, "want %s\n", oid_to_hex(remote
));
1065 packet_buf_write(req_buf
, "want-ref %s\n", wants
->name
);
1069 static void add_common(struct strbuf
*req_buf
, struct oidset
*common
)
1071 struct oidset_iter iter
;
1072 const struct object_id
*oid
;
1073 oidset_iter_init(common
, &iter
);
1075 while ((oid
= oidset_iter_next(&iter
))) {
1076 packet_buf_write(req_buf
, "have %s\n", oid_to_hex(oid
));
1080 static int add_haves(struct fetch_negotiator
*negotiator
,
1081 struct strbuf
*req_buf
,
1082 int *haves_to_send
, int *in_vain
)
1085 int haves_added
= 0;
1086 const struct object_id
*oid
;
1088 while ((oid
= negotiator
->next(negotiator
))) {
1089 packet_buf_write(req_buf
, "have %s\n", oid_to_hex(oid
));
1090 if (++haves_added
>= *haves_to_send
)
1094 *in_vain
+= haves_added
;
1095 if (!haves_added
|| *in_vain
>= MAX_IN_VAIN
) {
1097 packet_buf_write(req_buf
, "done\n");
1101 /* Increase haves to send on next round */
1102 *haves_to_send
= next_flush(1, *haves_to_send
);
1107 static int send_fetch_request(struct fetch_negotiator
*negotiator
, int fd_out
,
1108 const struct fetch_pack_args
*args
,
1109 const struct ref
*wants
, struct oidset
*common
,
1110 int *haves_to_send
, int *in_vain
)
1113 struct strbuf req_buf
= STRBUF_INIT
;
1115 if (server_supports_v2("fetch", 1))
1116 packet_buf_write(&req_buf
, "command=fetch");
1117 if (server_supports_v2("agent", 0))
1118 packet_buf_write(&req_buf
, "agent=%s", git_user_agent_sanitized());
1119 if (args
->server_options
&& args
->server_options
->nr
&&
1120 server_supports_v2("server-option", 1)) {
1122 for (i
= 0; i
< args
->server_options
->nr
; i
++)
1123 packet_write_fmt(fd_out
, "server-option=%s",
1124 args
->server_options
->items
[i
].string
);
1127 packet_buf_delim(&req_buf
);
1128 if (args
->use_thin_pack
)
1129 packet_buf_write(&req_buf
, "thin-pack");
1130 if (args
->no_progress
)
1131 packet_buf_write(&req_buf
, "no-progress");
1132 if (args
->include_tag
)
1133 packet_buf_write(&req_buf
, "include-tag");
1134 if (prefer_ofs_delta
)
1135 packet_buf_write(&req_buf
, "ofs-delta");
1137 /* Add shallow-info and deepen request */
1138 if (server_supports_feature("fetch", "shallow", 0))
1139 add_shallow_requests(&req_buf
, args
);
1140 else if (is_repository_shallow(the_repository
) || args
->deepen
)
1141 die(_("Server does not support shallow requests"));
1144 if (server_supports_feature("fetch", "filter", 0) &&
1145 args
->filter_options
.choice
) {
1146 print_verbose(args
, _("Server supports filter"));
1147 packet_buf_write(&req_buf
, "filter %s",
1148 args
->filter_options
.filter_spec
);
1149 } else if (args
->filter_options
.choice
) {
1150 warning("filtering not recognized by server, ignoring");
1154 add_wants(wants
, &req_buf
);
1156 if (args
->no_dependents
) {
1157 packet_buf_write(&req_buf
, "done");
1160 /* Add all of the common commits we've found in previous rounds */
1161 add_common(&req_buf
, common
);
1163 /* Add initial haves */
1164 ret
= add_haves(negotiator
, &req_buf
, haves_to_send
, in_vain
);
1168 packet_buf_flush(&req_buf
);
1169 write_or_die(fd_out
, req_buf
.buf
, req_buf
.len
);
1171 strbuf_release(&req_buf
);
1176 * Processes a section header in a server's response and checks if it matches
1177 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1178 * not consumed); if 0, the line will be consumed and the function will die if
1179 * the section header doesn't match what was expected.
1181 static int process_section_header(struct packet_reader
*reader
,
1182 const char *section
, int peek
)
1186 if (packet_reader_peek(reader
) != PACKET_READ_NORMAL
)
1187 die("error reading section header '%s'", section
);
1189 ret
= !strcmp(reader
->line
, section
);
1193 die("expected '%s', received '%s'",
1194 section
, reader
->line
);
1195 packet_reader_read(reader
);
1201 static int process_acks(struct fetch_negotiator
*negotiator
,
1202 struct packet_reader
*reader
,
1203 struct oidset
*common
)
1206 int received_ready
= 0;
1207 int received_ack
= 0;
1209 process_section_header(reader
, "acknowledgments", 0);
1210 while (packet_reader_read(reader
) == PACKET_READ_NORMAL
) {
1213 if (!strcmp(reader
->line
, "NAK"))
1216 if (skip_prefix(reader
->line
, "ACK ", &arg
)) {
1217 struct object_id oid
;
1218 if (!get_oid_hex(arg
, &oid
)) {
1219 struct commit
*commit
;
1220 oidset_insert(common
, &oid
);
1221 commit
= lookup_commit(the_repository
, &oid
);
1222 negotiator
->ack(negotiator
, commit
);
1227 if (!strcmp(reader
->line
, "ready")) {
1232 die("unexpected acknowledgment line: '%s'", reader
->line
);
1235 if (reader
->status
!= PACKET_READ_FLUSH
&&
1236 reader
->status
!= PACKET_READ_DELIM
)
1237 die("error processing acks: %d", reader
->status
);
1239 /* return 0 if no common, 1 if there are common, or 2 if ready */
1240 return received_ready
? 2 : (received_ack
? 1 : 0);
1243 static void receive_shallow_info(struct fetch_pack_args
*args
,
1244 struct packet_reader
*reader
)
1246 process_section_header(reader
, "shallow-info", 0);
1247 while (packet_reader_read(reader
) == PACKET_READ_NORMAL
) {
1249 struct object_id oid
;
1251 if (skip_prefix(reader
->line
, "shallow ", &arg
)) {
1252 if (get_oid_hex(arg
, &oid
))
1253 die(_("invalid shallow line: %s"), reader
->line
);
1254 register_shallow(the_repository
, &oid
);
1257 if (skip_prefix(reader
->line
, "unshallow ", &arg
)) {
1258 if (get_oid_hex(arg
, &oid
))
1259 die(_("invalid unshallow line: %s"), reader
->line
);
1260 if (!lookup_object(the_repository
, oid
.hash
))
1261 die(_("object not found: %s"), reader
->line
);
1262 /* make sure that it is parsed as shallow */
1263 if (!parse_object(the_repository
, &oid
))
1264 die(_("error in object: %s"), reader
->line
);
1265 if (unregister_shallow(&oid
))
1266 die(_("no shallow found: %s"), reader
->line
);
1269 die(_("expected shallow/unshallow, got %s"), reader
->line
);
1272 if (reader
->status
!= PACKET_READ_FLUSH
&&
1273 reader
->status
!= PACKET_READ_DELIM
)
1274 die("error processing shallow info: %d", reader
->status
);
1276 setup_alternate_shallow(&shallow_lock
, &alternate_shallow_file
, NULL
);
1280 static void receive_wanted_refs(struct packet_reader
*reader
, struct ref
*refs
)
1282 process_section_header(reader
, "wanted-refs", 0);
1283 while (packet_reader_read(reader
) == PACKET_READ_NORMAL
) {
1284 struct object_id oid
;
1286 struct ref
*r
= NULL
;
1288 if (parse_oid_hex(reader
->line
, &oid
, &end
) || *end
++ != ' ')
1289 die("expected wanted-ref, got '%s'", reader
->line
);
1291 for (r
= refs
; r
; r
= r
->next
) {
1292 if (!strcmp(end
, r
->name
)) {
1293 oidcpy(&r
->old_oid
, &oid
);
1299 die("unexpected wanted-ref: '%s'", reader
->line
);
1302 if (reader
->status
!= PACKET_READ_DELIM
)
1303 die("error processing wanted refs: %d", reader
->status
);
1307 FETCH_CHECK_LOCAL
= 0,
1314 static struct ref
*do_fetch_pack_v2(struct fetch_pack_args
*args
,
1316 const struct ref
*orig_ref
,
1317 struct ref
**sought
, int nr_sought
,
1318 char **pack_lockfile
)
1320 struct ref
*ref
= copy_ref_list(orig_ref
);
1321 enum fetch_state state
= FETCH_CHECK_LOCAL
;
1322 struct oidset common
= OIDSET_INIT
;
1323 struct packet_reader reader
;
1325 int haves_to_send
= INITIAL_FLUSH
;
1326 struct fetch_negotiator negotiator
;
1327 fetch_negotiator_init(&negotiator
);
1328 packet_reader_init(&reader
, fd
[0], NULL
, 0,
1329 PACKET_READ_CHOMP_NEWLINE
);
1331 while (state
!= FETCH_DONE
) {
1333 case FETCH_CHECK_LOCAL
:
1334 sort_ref_list(&ref
, ref_compare_name
);
1335 QSORT(sought
, nr_sought
, cmp_ref_by_name
);
1337 /* v2 supports these by default */
1338 allow_unadvertised_object_request
|= ALLOW_REACHABLE_SHA1
;
1340 if (args
->depth
> 0 || args
->deepen_since
|| args
->deepen_not
)
1343 /* Filter 'ref' by 'sought' and those that aren't local */
1344 mark_complete_and_common_ref(&negotiator
, args
, &ref
);
1345 filter_refs(args
, &ref
, sought
, nr_sought
);
1346 if (everything_local(args
, &ref
))
1349 state
= FETCH_SEND_REQUEST
;
1351 mark_tips(&negotiator
, args
->negotiation_tips
);
1352 for_each_cached_alternate(&negotiator
,
1353 insert_one_alternate_object
);
1355 case FETCH_SEND_REQUEST
:
1356 if (send_fetch_request(&negotiator
, fd
[1], args
, ref
,
1358 &haves_to_send
, &in_vain
))
1359 state
= FETCH_GET_PACK
;
1361 state
= FETCH_PROCESS_ACKS
;
1363 case FETCH_PROCESS_ACKS
:
1364 /* Process ACKs/NAKs */
1365 switch (process_acks(&negotiator
, &reader
, &common
)) {
1367 state
= FETCH_GET_PACK
;
1373 state
= FETCH_SEND_REQUEST
;
1377 case FETCH_GET_PACK
:
1378 /* Check for shallow-info section */
1379 if (process_section_header(&reader
, "shallow-info", 1))
1380 receive_shallow_info(args
, &reader
);
1382 if (process_section_header(&reader
, "wanted-refs", 1))
1383 receive_wanted_refs(&reader
, ref
);
1386 process_section_header(&reader
, "packfile", 0);
1387 if (get_pack(args
, fd
, pack_lockfile
))
1388 die(_("git fetch-pack: fetch failed."));
1397 negotiator
.release(&negotiator
);
1398 oidset_clear(&common
);
1402 static void fetch_pack_config(void)
1404 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit
);
1405 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit
);
1406 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta
);
1407 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects
);
1408 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects
);
1410 git_config(git_default_config
, NULL
);
1413 static void fetch_pack_setup(void)
1415 static int did_setup
;
1418 fetch_pack_config();
1419 if (0 <= transfer_unpack_limit
)
1420 unpack_limit
= transfer_unpack_limit
;
1421 else if (0 <= fetch_unpack_limit
)
1422 unpack_limit
= fetch_unpack_limit
;
1426 static int remove_duplicates_in_refs(struct ref
**ref
, int nr
)
1428 struct string_list names
= STRING_LIST_INIT_NODUP
;
1431 for (src
= dst
= 0; src
< nr
; src
++) {
1432 struct string_list_item
*item
;
1433 item
= string_list_insert(&names
, ref
[src
]->name
);
1435 continue; /* already have it */
1436 item
->util
= ref
[src
];
1438 ref
[dst
] = ref
[src
];
1441 for (src
= dst
; src
< nr
; src
++)
1443 string_list_clear(&names
, 0);
1447 static void update_shallow(struct fetch_pack_args
*args
,
1449 struct shallow_info
*si
)
1451 struct oid_array ref
= OID_ARRAY_INIT
;
1456 if (args
->deepen
&& alternate_shallow_file
) {
1457 if (*alternate_shallow_file
== '\0') { /* --unshallow */
1458 unlink_or_warn(git_path_shallow(the_repository
));
1459 rollback_lock_file(&shallow_lock
);
1461 commit_lock_file(&shallow_lock
);
1465 if (!si
->shallow
|| !si
->shallow
->nr
)
1468 if (args
->cloning
) {
1470 * remote is shallow, but this is a clone, there are
1471 * no objects in repo to worry about. Accept any
1472 * shallow points that exist in the pack (iow in repo
1473 * after get_pack() and reprepare_packed_git())
1475 struct oid_array extra
= OID_ARRAY_INIT
;
1476 struct object_id
*oid
= si
->shallow
->oid
;
1477 for (i
= 0; i
< si
->shallow
->nr
; i
++)
1478 if (has_object_file(&oid
[i
]))
1479 oid_array_append(&extra
, &oid
[i
]);
1481 setup_alternate_shallow(&shallow_lock
,
1482 &alternate_shallow_file
,
1484 commit_lock_file(&shallow_lock
);
1486 oid_array_clear(&extra
);
1490 if (!si
->nr_ours
&& !si
->nr_theirs
)
1493 remove_nonexistent_theirs_shallow(si
);
1494 if (!si
->nr_ours
&& !si
->nr_theirs
)
1496 for (r
= refs
; r
; r
= r
->next
)
1497 oid_array_append(&ref
, &r
->old_oid
);
1500 if (args
->update_shallow
) {
1502 * remote is also shallow, .git/shallow may be updated
1503 * so all refs can be accepted. Make sure we only add
1504 * shallow roots that are actually reachable from new
1507 struct oid_array extra
= OID_ARRAY_INIT
;
1508 struct object_id
*oid
= si
->shallow
->oid
;
1509 assign_shallow_commits_to_refs(si
, NULL
, NULL
);
1510 if (!si
->nr_ours
&& !si
->nr_theirs
) {
1511 oid_array_clear(&ref
);
1514 for (i
= 0; i
< si
->nr_ours
; i
++)
1515 oid_array_append(&extra
, &oid
[si
->ours
[i
]]);
1516 for (i
= 0; i
< si
->nr_theirs
; i
++)
1517 oid_array_append(&extra
, &oid
[si
->theirs
[i
]]);
1518 setup_alternate_shallow(&shallow_lock
,
1519 &alternate_shallow_file
,
1521 commit_lock_file(&shallow_lock
);
1522 oid_array_clear(&extra
);
1523 oid_array_clear(&ref
);
1528 * remote is also shallow, check what ref is safe to update
1529 * without updating .git/shallow
1531 status
= xcalloc(ref
.nr
, sizeof(*status
));
1532 assign_shallow_commits_to_refs(si
, NULL
, status
);
1533 if (si
->nr_ours
|| si
->nr_theirs
) {
1534 for (r
= refs
, i
= 0; r
; r
= r
->next
, i
++)
1536 r
->status
= REF_STATUS_REJECT_SHALLOW
;
1539 oid_array_clear(&ref
);
1542 static int iterate_ref_map(void *cb_data
, struct object_id
*oid
)
1544 struct ref
**rm
= cb_data
;
1545 struct ref
*ref
= *rm
;
1548 return -1; /* end of the list */
1550 oidcpy(oid
, &ref
->old_oid
);
1554 struct ref
*fetch_pack(struct fetch_pack_args
*args
,
1555 int fd
[], struct child_process
*conn
,
1556 const struct ref
*ref
,
1558 struct ref
**sought
, int nr_sought
,
1559 struct oid_array
*shallow
,
1560 char **pack_lockfile
,
1561 enum protocol_version version
)
1563 struct ref
*ref_cpy
;
1564 struct shallow_info si
;
1568 nr_sought
= remove_duplicates_in_refs(sought
, nr_sought
);
1571 packet_flush(fd
[1]);
1572 die(_("no matching remote head"));
1574 prepare_shallow_info(&si
, shallow
);
1575 if (version
== protocol_v2
)
1576 ref_cpy
= do_fetch_pack_v2(args
, fd
, ref
, sought
, nr_sought
,
1579 ref_cpy
= do_fetch_pack(args
, fd
, ref
, sought
, nr_sought
,
1580 &si
, pack_lockfile
);
1581 reprepare_packed_git(the_repository
);
1583 if (!args
->cloning
&& args
->deepen
) {
1584 struct check_connected_options opt
= CHECK_CONNECTED_INIT
;
1585 struct ref
*iterator
= ref_cpy
;
1586 opt
.shallow_file
= alternate_shallow_file
;
1588 opt
.is_deepening_fetch
= 1;
1589 if (check_connected(iterate_ref_map
, &iterator
, &opt
)) {
1590 error(_("remote did not send all necessary objects"));
1593 rollback_lock_file(&shallow_lock
);
1596 args
->connectivity_checked
= 1;
1599 update_shallow(args
, ref_cpy
, &si
);
1601 clear_shallow_info(&si
);
1605 int report_unmatched_refs(struct ref
**sought
, int nr_sought
)
1609 for (i
= 0; i
< nr_sought
; i
++) {
1612 switch (sought
[i
]->match_status
) {
1615 case REF_NOT_MATCHED
:
1616 error(_("no such remote ref %s"), sought
[i
]->name
);
1618 case REF_UNADVERTISED_NOT_ALLOWED
:
1619 error(_("Server does not allow request for unadvertised object %s"),