2012-10-26 23:53:55 +08:00
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#include "cache.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "commit.h"
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#include "tag.h"
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#include "exec_cmd.h"
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#include "pack.h"
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#include "sideband.h"
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#include "fetch-pack.h"
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#include "remote.h"
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#include "run-command.h"
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2013-07-09 04:56:53 +08:00
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#include "connect.h"
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2012-10-26 23:53:55 +08:00
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#include "transport.h"
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#include "version.h"
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fetch-pack: avoid quadratic behavior in rev_list_push
When we call find_common to start finding common ancestors
with the remote side of a fetch, the first thing we do is
insert the tip of each ref into our rev_list linked list. We
keep the list sorted the whole time with
commit_list_insert_by_date, which means our insertion ends
up doing O(n^2) timestamp comparisons.
We could teach rev_list_push to use an unsorted list, and
then sort it once after we have added each ref. However, in
get_rev, we process the list by popping commits off the
front and adding parents back in timestamp-sorted order. So
that procedure would still operate on the large list.
Instead, we can replace the linked list with a heap-based
priority queue, which can do O(log n) insertion, making the
whole insertion procedure O(n log n).
As a result of switching to the prio_queue struct, we fix
two minor bugs:
1. When we "pop" a commit in get_rev, and when we clear
the rev_list in find_common, we do not take care to
free the "struct commit_list", and just leak its
memory. With the prio_queue implementation, the memory
management is handled for us.
2. In get_rev, we look at the head commit of the list,
possibly push its parents onto the list, and then "pop"
the front of the list off, assuming it is the same
element that we just peeked at. This is typically going
to be the case, but would not be in the face of clock
skew: the parents are inserted by date, and could
potentially be inserted at the head of the list if they
have a timestamp newer than their descendent. In this
case, we would accidentally pop the parent, and never
process it at all.
The new implementation pulls the commit off of the
queue as we examine it, and so does not suffer from
this problem.
With this patch, a fetch of a single commit into a
repository with 50,000 refs went from:
real 0m7.984s
user 0m7.852s
sys 0m0.120s
to:
real 0m2.017s
user 0m1.884s
sys 0m0.124s
Before this patch, a larger case with 370K refs still had
not completed after tens of minutes; with this patch, it
completes in about 12 seconds.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:24:21 +08:00
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#include "prio-queue.h"
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2013-12-05 21:02:39 +08:00
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#include "sha1-array.h"
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2012-10-26 23:53:55 +08:00
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static int transfer_unpack_limit = -1;
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static int fetch_unpack_limit = -1;
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static int unpack_limit = 100;
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static int prefer_ofs_delta = 1;
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static int no_done;
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static int fetch_fsck_objects = -1;
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static int transfer_fsck_objects = -1;
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static int agent_supported;
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2013-05-26 09:16:15 +08:00
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static struct lock_file shallow_lock;
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static const char *alternate_shallow_file;
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2012-10-26 23:53:55 +08:00
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#define COMPLETE (1U << 0)
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#define COMMON (1U << 1)
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#define COMMON_REF (1U << 2)
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#define SEEN (1U << 3)
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#define POPPED (1U << 4)
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static int marked;
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/*
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* After sending this many "have"s if we do not get any new ACK , we
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* give up traversing our history.
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*/
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#define MAX_IN_VAIN 256
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|
fetch-pack: avoid quadratic behavior in rev_list_push
When we call find_common to start finding common ancestors
with the remote side of a fetch, the first thing we do is
insert the tip of each ref into our rev_list linked list. We
keep the list sorted the whole time with
commit_list_insert_by_date, which means our insertion ends
up doing O(n^2) timestamp comparisons.
We could teach rev_list_push to use an unsorted list, and
then sort it once after we have added each ref. However, in
get_rev, we process the list by popping commits off the
front and adding parents back in timestamp-sorted order. So
that procedure would still operate on the large list.
Instead, we can replace the linked list with a heap-based
priority queue, which can do O(log n) insertion, making the
whole insertion procedure O(n log n).
As a result of switching to the prio_queue struct, we fix
two minor bugs:
1. When we "pop" a commit in get_rev, and when we clear
the rev_list in find_common, we do not take care to
free the "struct commit_list", and just leak its
memory. With the prio_queue implementation, the memory
management is handled for us.
2. In get_rev, we look at the head commit of the list,
possibly push its parents onto the list, and then "pop"
the front of the list off, assuming it is the same
element that we just peeked at. This is typically going
to be the case, but would not be in the face of clock
skew: the parents are inserted by date, and could
potentially be inserted at the head of the list if they
have a timestamp newer than their descendent. In this
case, we would accidentally pop the parent, and never
process it at all.
The new implementation pulls the commit off of the
queue as we examine it, and so does not suffer from
this problem.
With this patch, a fetch of a single commit into a
repository with 50,000 refs went from:
real 0m7.984s
user 0m7.852s
sys 0m0.120s
to:
real 0m2.017s
user 0m1.884s
sys 0m0.124s
Before this patch, a larger case with 370K refs still had
not completed after tens of minutes; with this patch, it
completes in about 12 seconds.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:24:21 +08:00
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static struct prio_queue rev_list = { compare_commits_by_commit_date };
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2013-01-30 06:02:15 +08:00
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static int non_common_revs, multi_ack, use_sideband, allow_tip_sha1_in_want;
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2012-10-26 23:53:55 +08:00
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static void rev_list_push(struct commit *commit, int mark)
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{
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if (!(commit->object.flags & mark)) {
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commit->object.flags |= mark;
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if (!(commit->object.parsed))
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if (parse_commit(commit))
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return;
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fetch-pack: avoid quadratic behavior in rev_list_push
When we call find_common to start finding common ancestors
with the remote side of a fetch, the first thing we do is
insert the tip of each ref into our rev_list linked list. We
keep the list sorted the whole time with
commit_list_insert_by_date, which means our insertion ends
up doing O(n^2) timestamp comparisons.
We could teach rev_list_push to use an unsorted list, and
then sort it once after we have added each ref. However, in
get_rev, we process the list by popping commits off the
front and adding parents back in timestamp-sorted order. So
that procedure would still operate on the large list.
Instead, we can replace the linked list with a heap-based
priority queue, which can do O(log n) insertion, making the
whole insertion procedure O(n log n).
As a result of switching to the prio_queue struct, we fix
two minor bugs:
1. When we "pop" a commit in get_rev, and when we clear
the rev_list in find_common, we do not take care to
free the "struct commit_list", and just leak its
memory. With the prio_queue implementation, the memory
management is handled for us.
2. In get_rev, we look at the head commit of the list,
possibly push its parents onto the list, and then "pop"
the front of the list off, assuming it is the same
element that we just peeked at. This is typically going
to be the case, but would not be in the face of clock
skew: the parents are inserted by date, and could
potentially be inserted at the head of the list if they
have a timestamp newer than their descendent. In this
case, we would accidentally pop the parent, and never
process it at all.
The new implementation pulls the commit off of the
queue as we examine it, and so does not suffer from
this problem.
With this patch, a fetch of a single commit into a
repository with 50,000 refs went from:
real 0m7.984s
user 0m7.852s
sys 0m0.120s
to:
real 0m2.017s
user 0m1.884s
sys 0m0.124s
Before this patch, a larger case with 370K refs still had
not completed after tens of minutes; with this patch, it
completes in about 12 seconds.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:24:21 +08:00
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prio_queue_put(&rev_list, commit);
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2012-10-26 23:53:55 +08:00
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if (!(commit->object.flags & COMMON))
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non_common_revs++;
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}
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}
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static int rev_list_insert_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct object *o = deref_tag(parse_object(sha1), refname, 0);
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if (o && o->type == OBJ_COMMIT)
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rev_list_push((struct commit *)o, SEEN);
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return 0;
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}
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static int clear_marks(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct object *o = deref_tag(parse_object(sha1), refname, 0);
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if (o && o->type == OBJ_COMMIT)
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clear_commit_marks((struct commit *)o,
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COMMON | COMMON_REF | SEEN | POPPED);
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return 0;
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}
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/*
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This function marks a rev and its ancestors as common.
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In some cases, it is desirable to mark only the ancestors (for example
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when only the server does not yet know that they are common).
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*/
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static void mark_common(struct commit *commit,
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int ancestors_only, int dont_parse)
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{
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if (commit != NULL && !(commit->object.flags & COMMON)) {
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struct object *o = (struct object *)commit;
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if (!ancestors_only)
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o->flags |= COMMON;
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if (!(o->flags & SEEN))
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rev_list_push(commit, SEEN);
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else {
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struct commit_list *parents;
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if (!ancestors_only && !(o->flags & POPPED))
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non_common_revs--;
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if (!o->parsed && !dont_parse)
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if (parse_commit(commit))
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return;
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for (parents = commit->parents;
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parents;
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parents = parents->next)
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mark_common(parents->item, 0, dont_parse);
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}
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}
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}
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/*
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Get the next rev to send, ignoring the common.
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*/
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static const unsigned char *get_rev(void)
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{
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struct commit *commit = NULL;
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while (commit == NULL) {
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unsigned int mark;
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struct commit_list *parents;
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|
fetch-pack: avoid quadratic behavior in rev_list_push
When we call find_common to start finding common ancestors
with the remote side of a fetch, the first thing we do is
insert the tip of each ref into our rev_list linked list. We
keep the list sorted the whole time with
commit_list_insert_by_date, which means our insertion ends
up doing O(n^2) timestamp comparisons.
We could teach rev_list_push to use an unsorted list, and
then sort it once after we have added each ref. However, in
get_rev, we process the list by popping commits off the
front and adding parents back in timestamp-sorted order. So
that procedure would still operate on the large list.
Instead, we can replace the linked list with a heap-based
priority queue, which can do O(log n) insertion, making the
whole insertion procedure O(n log n).
As a result of switching to the prio_queue struct, we fix
two minor bugs:
1. When we "pop" a commit in get_rev, and when we clear
the rev_list in find_common, we do not take care to
free the "struct commit_list", and just leak its
memory. With the prio_queue implementation, the memory
management is handled for us.
2. In get_rev, we look at the head commit of the list,
possibly push its parents onto the list, and then "pop"
the front of the list off, assuming it is the same
element that we just peeked at. This is typically going
to be the case, but would not be in the face of clock
skew: the parents are inserted by date, and could
potentially be inserted at the head of the list if they
have a timestamp newer than their descendent. In this
case, we would accidentally pop the parent, and never
process it at all.
The new implementation pulls the commit off of the
queue as we examine it, and so does not suffer from
this problem.
With this patch, a fetch of a single commit into a
repository with 50,000 refs went from:
real 0m7.984s
user 0m7.852s
sys 0m0.120s
to:
real 0m2.017s
user 0m1.884s
sys 0m0.124s
Before this patch, a larger case with 370K refs still had
not completed after tens of minutes; with this patch, it
completes in about 12 seconds.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:24:21 +08:00
|
|
|
if (rev_list.nr == 0 || non_common_revs == 0)
|
2012-10-26 23:53:55 +08:00
|
|
|
return NULL;
|
|
|
|
|
|
fetch-pack: avoid quadratic behavior in rev_list_push
When we call find_common to start finding common ancestors
with the remote side of a fetch, the first thing we do is
insert the tip of each ref into our rev_list linked list. We
keep the list sorted the whole time with
commit_list_insert_by_date, which means our insertion ends
up doing O(n^2) timestamp comparisons.
We could teach rev_list_push to use an unsorted list, and
then sort it once after we have added each ref. However, in
get_rev, we process the list by popping commits off the
front and adding parents back in timestamp-sorted order. So
that procedure would still operate on the large list.
Instead, we can replace the linked list with a heap-based
priority queue, which can do O(log n) insertion, making the
whole insertion procedure O(n log n).
As a result of switching to the prio_queue struct, we fix
two minor bugs:
1. When we "pop" a commit in get_rev, and when we clear
the rev_list in find_common, we do not take care to
free the "struct commit_list", and just leak its
memory. With the prio_queue implementation, the memory
management is handled for us.
2. In get_rev, we look at the head commit of the list,
possibly push its parents onto the list, and then "pop"
the front of the list off, assuming it is the same
element that we just peeked at. This is typically going
to be the case, but would not be in the face of clock
skew: the parents are inserted by date, and could
potentially be inserted at the head of the list if they
have a timestamp newer than their descendent. In this
case, we would accidentally pop the parent, and never
process it at all.
The new implementation pulls the commit off of the
queue as we examine it, and so does not suffer from
this problem.
With this patch, a fetch of a single commit into a
repository with 50,000 refs went from:
real 0m7.984s
user 0m7.852s
sys 0m0.120s
to:
real 0m2.017s
user 0m1.884s
sys 0m0.124s
Before this patch, a larger case with 370K refs still had
not completed after tens of minutes; with this patch, it
completes in about 12 seconds.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:24:21 +08:00
|
|
|
commit = prio_queue_get(&rev_list);
|
2012-10-26 23:53:55 +08:00
|
|
|
if (!commit->object.parsed)
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parse_commit(commit);
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parents = commit->parents;
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commit->object.flags |= POPPED;
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if (!(commit->object.flags & COMMON))
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non_common_revs--;
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if (commit->object.flags & COMMON) {
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/* do not send "have", and ignore ancestors */
|
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commit = NULL;
|
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mark = COMMON | SEEN;
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} else if (commit->object.flags & COMMON_REF)
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/* send "have", and ignore ancestors */
|
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mark = COMMON | SEEN;
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else
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/* send "have", also for its ancestors */
|
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mark = SEEN;
|
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while (parents) {
|
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if (!(parents->item->object.flags & SEEN))
|
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rev_list_push(parents->item, mark);
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if (mark & COMMON)
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mark_common(parents->item, 1, 0);
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parents = parents->next;
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}
|
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|
}
|
|
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|
return commit->object.sha1;
|
|
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|
|
}
|
|
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|
enum ack_type {
|
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|
NAK = 0,
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ACK,
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ACK_continue,
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ACK_common,
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ACK_ready
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};
|
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|
static void consume_shallow_list(struct fetch_pack_args *args, int fd)
|
|
|
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|
{
|
|
|
|
|
if (args->stateless_rpc && args->depth > 0) {
|
|
|
|
|
/* If we sent a depth we will get back "duplicate"
|
|
|
|
|
* shallow and unshallow commands every time there
|
|
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|
* is a block of have lines exchanged.
|
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|
*/
|
pkt-line: provide a LARGE_PACKET_MAX static buffer
Most of the callers of packet_read_line just read into a
static 1000-byte buffer (callers which handle arbitrary
binary data already use LARGE_PACKET_MAX). This works fine
in practice, because:
1. The only variable-sized data in these lines is a ref
name, and refs tend to be a lot shorter than 1000
characters.
2. When sending ref lines, git-core always limits itself
to 1000 byte packets.
However, the only limit given in the protocol specification
in Documentation/technical/protocol-common.txt is
LARGE_PACKET_MAX; the 1000 byte limit is mentioned only in
pack-protocol.txt, and then only describing what we write,
not as a specific limit for readers.
This patch lets us bump the 1000-byte limit to
LARGE_PACKET_MAX. Even though git-core will never write a
packet where this makes a difference, there are two good
reasons to do this:
1. Other git implementations may have followed
protocol-common.txt and used a larger maximum size. We
don't bump into it in practice because it would involve
very long ref names.
2. We may want to increase the 1000-byte limit one day.
Since packets are transferred before any capabilities,
it's difficult to do this in a backwards-compatible
way. But if we bump the size of buffer the readers can
handle, eventually older versions of git will be
obsolete enough that we can justify bumping the
writers, as well. We don't have plans to do this
anytime soon, but there is no reason not to start the
clock ticking now.
Just bumping all of the reading bufs to LARGE_PACKET_MAX
would waste memory. Instead, since most readers just read
into a temporary buffer anyway, let's provide a single
static buffer that all callers can use. We can further wrap
this detail away by having the packet_read_line wrapper just
use the buffer transparently and return a pointer to the
static storage. That covers most of the cases, and the
remaining ones already read into their own LARGE_PACKET_MAX
buffers.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-21 04:02:57 +08:00
|
|
|
char *line;
|
|
|
|
|
while ((line = packet_read_line(fd, NULL))) {
|
2012-10-26 23:53:55 +08:00
|
|
|
if (!prefixcmp(line, "shallow "))
|
|
|
|
|
continue;
|
|
|
|
|
if (!prefixcmp(line, "unshallow "))
|
|
|
|
|
continue;
|
|
|
|
|
die("git fetch-pack: expected shallow list");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static enum ack_type get_ack(int fd, unsigned char *result_sha1)
|
|
|
|
|
{
|
pkt-line: provide a LARGE_PACKET_MAX static buffer
Most of the callers of packet_read_line just read into a
static 1000-byte buffer (callers which handle arbitrary
binary data already use LARGE_PACKET_MAX). This works fine
in practice, because:
1. The only variable-sized data in these lines is a ref
name, and refs tend to be a lot shorter than 1000
characters.
2. When sending ref lines, git-core always limits itself
to 1000 byte packets.
However, the only limit given in the protocol specification
in Documentation/technical/protocol-common.txt is
LARGE_PACKET_MAX; the 1000 byte limit is mentioned only in
pack-protocol.txt, and then only describing what we write,
not as a specific limit for readers.
This patch lets us bump the 1000-byte limit to
LARGE_PACKET_MAX. Even though git-core will never write a
packet where this makes a difference, there are two good
reasons to do this:
1. Other git implementations may have followed
protocol-common.txt and used a larger maximum size. We
don't bump into it in practice because it would involve
very long ref names.
2. We may want to increase the 1000-byte limit one day.
Since packets are transferred before any capabilities,
it's difficult to do this in a backwards-compatible
way. But if we bump the size of buffer the readers can
handle, eventually older versions of git will be
obsolete enough that we can justify bumping the
writers, as well. We don't have plans to do this
anytime soon, but there is no reason not to start the
clock ticking now.
Just bumping all of the reading bufs to LARGE_PACKET_MAX
would waste memory. Instead, since most readers just read
into a temporary buffer anyway, let's provide a single
static buffer that all callers can use. We can further wrap
this detail away by having the packet_read_line wrapper just
use the buffer transparently and return a pointer to the
static storage. That covers most of the cases, and the
remaining ones already read into their own LARGE_PACKET_MAX
buffers.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-21 04:02:57 +08:00
|
|
|
int len;
|
|
|
|
|
char *line = packet_read_line(fd, &len);
|
2012-10-26 23:53:55 +08:00
|
|
|
|
|
|
|
|
if (!len)
|
|
|
|
|
die("git fetch-pack: expected ACK/NAK, got EOF");
|
|
|
|
|
if (!strcmp(line, "NAK"))
|
|
|
|
|
return NAK;
|
|
|
|
|
if (!prefixcmp(line, "ACK ")) {
|
|
|
|
|
if (!get_sha1_hex(line+4, result_sha1)) {
|
fetch-pack: fix out-of-bounds buffer offset in get_ack
When we read acks from the remote, we expect either:
ACK <sha1>
or
ACK <sha1> <multi-ack-flag>
We parse the "ACK <sha1>" bit from the line, and then start
looking for the flag strings at "line+45"; if we don't have
them, we assume it's of the first type. But if we do have
the first type, then line+45 is not necessarily inside our
string at all!
It turns out that this works most of the time due to the way
we parse the packets. They should come in with a newline,
and packet_read puts an extra NUL into the buffer, so we end
up with:
ACK <sha1>\n\0
with the newline at offset 44 and the NUL at offset 45. We
then strip the newline, putting a NUL at offset 44. So
when we look at "line+45", we are looking past the end of
our string; but it's OK, because we hit the terminator from
the original string.
This breaks down, however, if the other side does not
terminate their packets with a newline. In that case, our
packet is one character shorter, and we start looking
through uninitialized memory for the flag. No known
implementation sends such a packet, so it has never come up
in practice.
This patch tightens the check by looking for a short,
flagless ACK before trying to parse the flag.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-21 04:00:28 +08:00
|
|
|
if (len < 45)
|
|
|
|
|
return ACK;
|
2012-10-26 23:53:55 +08:00
|
|
|
if (strstr(line+45, "continue"))
|
|
|
|
|
return ACK_continue;
|
|
|
|
|
if (strstr(line+45, "common"))
|
|
|
|
|
return ACK_common;
|
|
|
|
|
if (strstr(line+45, "ready"))
|
|
|
|
|
return ACK_ready;
|
|
|
|
|
return ACK;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
die("git fetch_pack: expected ACK/NAK, got '%s'", line);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void send_request(struct fetch_pack_args *args,
|
|
|
|
|
int fd, struct strbuf *buf)
|
|
|
|
|
{
|
|
|
|
|
if (args->stateless_rpc) {
|
|
|
|
|
send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
|
|
|
|
|
packet_flush(fd);
|
|
|
|
|
} else
|
2013-02-21 04:01:56 +08:00
|
|
|
write_or_die(fd, buf->buf, buf->len);
|
2012-10-26 23:53:55 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void insert_one_alternate_ref(const struct ref *ref, void *unused)
|
|
|
|
|
{
|
|
|
|
|
rev_list_insert_ref(NULL, ref->old_sha1, 0, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#define INITIAL_FLUSH 16
|
|
|
|
|
#define PIPESAFE_FLUSH 32
|
|
|
|
|
#define LARGE_FLUSH 1024
|
|
|
|
|
|
|
|
|
|
static int next_flush(struct fetch_pack_args *args, int count)
|
|
|
|
|
{
|
|
|
|
|
int flush_limit = args->stateless_rpc ? LARGE_FLUSH : PIPESAFE_FLUSH;
|
|
|
|
|
|
|
|
|
|
if (count < flush_limit)
|
|
|
|
|
count <<= 1;
|
|
|
|
|
else
|
|
|
|
|
count += flush_limit;
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int find_common(struct fetch_pack_args *args,
|
|
|
|
|
int fd[2], unsigned char *result_sha1,
|
|
|
|
|
struct ref *refs)
|
|
|
|
|
{
|
|
|
|
|
int fetching;
|
|
|
|
|
int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
|
|
|
|
|
const unsigned char *sha1;
|
|
|
|
|
unsigned in_vain = 0;
|
|
|
|
|
int got_continue = 0;
|
|
|
|
|
int got_ready = 0;
|
|
|
|
|
struct strbuf req_buf = STRBUF_INIT;
|
|
|
|
|
size_t state_len = 0;
|
|
|
|
|
|
|
|
|
|
if (args->stateless_rpc && multi_ack == 1)
|
|
|
|
|
die("--stateless-rpc requires multi_ack_detailed");
|
|
|
|
|
if (marked)
|
|
|
|
|
for_each_ref(clear_marks, NULL);
|
|
|
|
|
marked = 1;
|
|
|
|
|
|
|
|
|
|
for_each_ref(rev_list_insert_ref, NULL);
|
|
|
|
|
for_each_alternate_ref(insert_one_alternate_ref, NULL);
|
|
|
|
|
|
|
|
|
|
fetching = 0;
|
|
|
|
|
for ( ; refs ; refs = refs->next) {
|
|
|
|
|
unsigned char *remote = refs->old_sha1;
|
|
|
|
|
const char *remote_hex;
|
|
|
|
|
struct object *o;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* If that object is complete (i.e. it is an ancestor of a
|
|
|
|
|
* local ref), we tell them we have it but do not have to
|
|
|
|
|
* tell them about its ancestors, which they already know
|
|
|
|
|
* about.
|
|
|
|
|
*
|
|
|
|
|
* We use lookup_object here because we are only
|
|
|
|
|
* interested in the case we *know* the object is
|
|
|
|
|
* reachable and we have already scanned it.
|
|
|
|
|
*/
|
|
|
|
|
if (((o = lookup_object(remote)) != NULL) &&
|
|
|
|
|
(o->flags & COMPLETE)) {
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
remote_hex = sha1_to_hex(remote);
|
|
|
|
|
if (!fetching) {
|
|
|
|
|
struct strbuf c = STRBUF_INIT;
|
|
|
|
|
if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
|
|
|
|
|
if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
|
|
|
|
|
if (no_done) strbuf_addstr(&c, " no-done");
|
|
|
|
|
if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
|
|
|
|
|
if (use_sideband == 1) strbuf_addstr(&c, " side-band");
|
|
|
|
|
if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
|
|
|
|
|
if (args->no_progress) strbuf_addstr(&c, " no-progress");
|
|
|
|
|
if (args->include_tag) strbuf_addstr(&c, " include-tag");
|
|
|
|
|
if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
|
|
|
|
|
if (agent_supported) strbuf_addf(&c, " agent=%s",
|
|
|
|
|
git_user_agent_sanitized());
|
|
|
|
|
packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
|
|
|
|
|
strbuf_release(&c);
|
|
|
|
|
} else
|
|
|
|
|
packet_buf_write(&req_buf, "want %s\n", remote_hex);
|
|
|
|
|
fetching++;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!fetching) {
|
|
|
|
|
strbuf_release(&req_buf);
|
|
|
|
|
packet_flush(fd[1]);
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (is_repository_shallow())
|
2013-12-05 21:02:34 +08:00
|
|
|
write_shallow_commits(&req_buf, 1, NULL);
|
2012-10-26 23:53:55 +08:00
|
|
|
if (args->depth > 0)
|
|
|
|
|
packet_buf_write(&req_buf, "deepen %d", args->depth);
|
|
|
|
|
packet_buf_flush(&req_buf);
|
|
|
|
|
state_len = req_buf.len;
|
|
|
|
|
|
|
|
|
|
if (args->depth > 0) {
|
pkt-line: provide a LARGE_PACKET_MAX static buffer
Most of the callers of packet_read_line just read into a
static 1000-byte buffer (callers which handle arbitrary
binary data already use LARGE_PACKET_MAX). This works fine
in practice, because:
1. The only variable-sized data in these lines is a ref
name, and refs tend to be a lot shorter than 1000
characters.
2. When sending ref lines, git-core always limits itself
to 1000 byte packets.
However, the only limit given in the protocol specification
in Documentation/technical/protocol-common.txt is
LARGE_PACKET_MAX; the 1000 byte limit is mentioned only in
pack-protocol.txt, and then only describing what we write,
not as a specific limit for readers.
This patch lets us bump the 1000-byte limit to
LARGE_PACKET_MAX. Even though git-core will never write a
packet where this makes a difference, there are two good
reasons to do this:
1. Other git implementations may have followed
protocol-common.txt and used a larger maximum size. We
don't bump into it in practice because it would involve
very long ref names.
2. We may want to increase the 1000-byte limit one day.
Since packets are transferred before any capabilities,
it's difficult to do this in a backwards-compatible
way. But if we bump the size of buffer the readers can
handle, eventually older versions of git will be
obsolete enough that we can justify bumping the
writers, as well. We don't have plans to do this
anytime soon, but there is no reason not to start the
clock ticking now.
Just bumping all of the reading bufs to LARGE_PACKET_MAX
would waste memory. Instead, since most readers just read
into a temporary buffer anyway, let's provide a single
static buffer that all callers can use. We can further wrap
this detail away by having the packet_read_line wrapper just
use the buffer transparently and return a pointer to the
static storage. That covers most of the cases, and the
remaining ones already read into their own LARGE_PACKET_MAX
buffers.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-21 04:02:57 +08:00
|
|
|
char *line;
|
2012-10-26 23:53:55 +08:00
|
|
|
unsigned char sha1[20];
|
|
|
|
|
|
|
|
|
|
send_request(args, fd[1], &req_buf);
|
pkt-line: provide a LARGE_PACKET_MAX static buffer
Most of the callers of packet_read_line just read into a
static 1000-byte buffer (callers which handle arbitrary
binary data already use LARGE_PACKET_MAX). This works fine
in practice, because:
1. The only variable-sized data in these lines is a ref
name, and refs tend to be a lot shorter than 1000
characters.
2. When sending ref lines, git-core always limits itself
to 1000 byte packets.
However, the only limit given in the protocol specification
in Documentation/technical/protocol-common.txt is
LARGE_PACKET_MAX; the 1000 byte limit is mentioned only in
pack-protocol.txt, and then only describing what we write,
not as a specific limit for readers.
This patch lets us bump the 1000-byte limit to
LARGE_PACKET_MAX. Even though git-core will never write a
packet where this makes a difference, there are two good
reasons to do this:
1. Other git implementations may have followed
protocol-common.txt and used a larger maximum size. We
don't bump into it in practice because it would involve
very long ref names.
2. We may want to increase the 1000-byte limit one day.
Since packets are transferred before any capabilities,
it's difficult to do this in a backwards-compatible
way. But if we bump the size of buffer the readers can
handle, eventually older versions of git will be
obsolete enough that we can justify bumping the
writers, as well. We don't have plans to do this
anytime soon, but there is no reason not to start the
clock ticking now.
Just bumping all of the reading bufs to LARGE_PACKET_MAX
would waste memory. Instead, since most readers just read
into a temporary buffer anyway, let's provide a single
static buffer that all callers can use. We can further wrap
this detail away by having the packet_read_line wrapper just
use the buffer transparently and return a pointer to the
static storage. That covers most of the cases, and the
remaining ones already read into their own LARGE_PACKET_MAX
buffers.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-21 04:02:57 +08:00
|
|
|
while ((line = packet_read_line(fd[0], NULL))) {
|
2012-10-26 23:53:55 +08:00
|
|
|
if (!prefixcmp(line, "shallow ")) {
|
|
|
|
|
if (get_sha1_hex(line + 8, sha1))
|
|
|
|
|
die("invalid shallow line: %s", line);
|
|
|
|
|
register_shallow(sha1);
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
if (!prefixcmp(line, "unshallow ")) {
|
|
|
|
|
if (get_sha1_hex(line + 10, sha1))
|
|
|
|
|
die("invalid unshallow line: %s", line);
|
|
|
|
|
if (!lookup_object(sha1))
|
|
|
|
|
die("object not found: %s", line);
|
|
|
|
|
/* make sure that it is parsed as shallow */
|
|
|
|
|
if (!parse_object(sha1))
|
|
|
|
|
die("error in object: %s", line);
|
|
|
|
|
if (unregister_shallow(sha1))
|
|
|
|
|
die("no shallow found: %s", line);
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
die("expected shallow/unshallow, got %s", line);
|
|
|
|
|
}
|
|
|
|
|
} else if (!args->stateless_rpc)
|
|
|
|
|
send_request(args, fd[1], &req_buf);
|
|
|
|
|
|
|
|
|
|
if (!args->stateless_rpc) {
|
|
|
|
|
/* If we aren't using the stateless-rpc interface
|
|
|
|
|
* we don't need to retain the headers.
|
|
|
|
|
*/
|
|
|
|
|
strbuf_setlen(&req_buf, 0);
|
|
|
|
|
state_len = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
flushes = 0;
|
|
|
|
|
retval = -1;
|
|
|
|
|
while ((sha1 = get_rev())) {
|
|
|
|
|
packet_buf_write(&req_buf, "have %s\n", sha1_to_hex(sha1));
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
|
|
|
|
|
in_vain++;
|
|
|
|
|
if (flush_at <= ++count) {
|
|
|
|
|
int ack;
|
|
|
|
|
|
|
|
|
|
packet_buf_flush(&req_buf);
|
|
|
|
|
send_request(args, fd[1], &req_buf);
|
|
|
|
|
strbuf_setlen(&req_buf, state_len);
|
|
|
|
|
flushes++;
|
|
|
|
|
flush_at = next_flush(args, count);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* We keep one window "ahead" of the other side, and
|
|
|
|
|
* will wait for an ACK only on the next one
|
|
|
|
|
*/
|
|
|
|
|
if (!args->stateless_rpc && count == INITIAL_FLUSH)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
consume_shallow_list(args, fd[0]);
|
|
|
|
|
do {
|
|
|
|
|
ack = get_ack(fd[0], result_sha1);
|
|
|
|
|
if (args->verbose && ack)
|
|
|
|
|
fprintf(stderr, "got ack %d %s\n", ack,
|
|
|
|
|
sha1_to_hex(result_sha1));
|
|
|
|
|
switch (ack) {
|
|
|
|
|
case ACK:
|
|
|
|
|
flushes = 0;
|
|
|
|
|
multi_ack = 0;
|
|
|
|
|
retval = 0;
|
|
|
|
|
goto done;
|
|
|
|
|
case ACK_common:
|
|
|
|
|
case ACK_ready:
|
|
|
|
|
case ACK_continue: {
|
|
|
|
|
struct commit *commit =
|
|
|
|
|
lookup_commit(result_sha1);
|
|
|
|
|
if (!commit)
|
|
|
|
|
die("invalid commit %s", sha1_to_hex(result_sha1));
|
|
|
|
|
if (args->stateless_rpc
|
|
|
|
|
&& ack == ACK_common
|
|
|
|
|
&& !(commit->object.flags & COMMON)) {
|
|
|
|
|
/* We need to replay the have for this object
|
|
|
|
|
* on the next RPC request so the peer knows
|
|
|
|
|
* it is in common with us.
|
|
|
|
|
*/
|
|
|
|
|
const char *hex = sha1_to_hex(result_sha1);
|
|
|
|
|
packet_buf_write(&req_buf, "have %s\n", hex);
|
|
|
|
|
state_len = req_buf.len;
|
|
|
|
|
}
|
|
|
|
|
mark_common(commit, 0, 1);
|
|
|
|
|
retval = 0;
|
|
|
|
|
in_vain = 0;
|
|
|
|
|
got_continue = 1;
|
|
|
|
|
if (ack == ACK_ready) {
|
fetch-pack: avoid quadratic behavior in rev_list_push
When we call find_common to start finding common ancestors
with the remote side of a fetch, the first thing we do is
insert the tip of each ref into our rev_list linked list. We
keep the list sorted the whole time with
commit_list_insert_by_date, which means our insertion ends
up doing O(n^2) timestamp comparisons.
We could teach rev_list_push to use an unsorted list, and
then sort it once after we have added each ref. However, in
get_rev, we process the list by popping commits off the
front and adding parents back in timestamp-sorted order. So
that procedure would still operate on the large list.
Instead, we can replace the linked list with a heap-based
priority queue, which can do O(log n) insertion, making the
whole insertion procedure O(n log n).
As a result of switching to the prio_queue struct, we fix
two minor bugs:
1. When we "pop" a commit in get_rev, and when we clear
the rev_list in find_common, we do not take care to
free the "struct commit_list", and just leak its
memory. With the prio_queue implementation, the memory
management is handled for us.
2. In get_rev, we look at the head commit of the list,
possibly push its parents onto the list, and then "pop"
the front of the list off, assuming it is the same
element that we just peeked at. This is typically going
to be the case, but would not be in the face of clock
skew: the parents are inserted by date, and could
potentially be inserted at the head of the list if they
have a timestamp newer than their descendent. In this
case, we would accidentally pop the parent, and never
process it at all.
The new implementation pulls the commit off of the
queue as we examine it, and so does not suffer from
this problem.
With this patch, a fetch of a single commit into a
repository with 50,000 refs went from:
real 0m7.984s
user 0m7.852s
sys 0m0.120s
to:
real 0m2.017s
user 0m1.884s
sys 0m0.124s
Before this patch, a larger case with 370K refs still had
not completed after tens of minutes; with this patch, it
completes in about 12 seconds.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:24:21 +08:00
|
|
|
clear_prio_queue(&rev_list);
|
2012-10-26 23:53:55 +08:00
|
|
|
got_ready = 1;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
} while (ack);
|
|
|
|
|
flushes--;
|
|
|
|
|
if (got_continue && MAX_IN_VAIN < in_vain) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "giving up\n");
|
|
|
|
|
break; /* give up */
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
done:
|
|
|
|
|
if (!got_ready || !no_done) {
|
|
|
|
|
packet_buf_write(&req_buf, "done\n");
|
|
|
|
|
send_request(args, fd[1], &req_buf);
|
|
|
|
|
}
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "done\n");
|
|
|
|
|
if (retval != 0) {
|
|
|
|
|
multi_ack = 0;
|
|
|
|
|
flushes++;
|
|
|
|
|
}
|
|
|
|
|
strbuf_release(&req_buf);
|
|
|
|
|
|
|
|
|
|
consume_shallow_list(args, fd[0]);
|
|
|
|
|
while (flushes || multi_ack) {
|
|
|
|
|
int ack = get_ack(fd[0], result_sha1);
|
|
|
|
|
if (ack) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "got ack (%d) %s\n", ack,
|
|
|
|
|
sha1_to_hex(result_sha1));
|
|
|
|
|
if (ack == ACK)
|
|
|
|
|
return 0;
|
|
|
|
|
multi_ack = 1;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
flushes--;
|
|
|
|
|
}
|
|
|
|
|
/* it is no error to fetch into a completely empty repo */
|
|
|
|
|
return count ? retval : 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct commit_list *complete;
|
|
|
|
|
|
|
|
|
|
static int mark_complete(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
|
|
|
|
|
{
|
|
|
|
|
struct object *o = parse_object(sha1);
|
|
|
|
|
|
|
|
|
|
while (o && o->type == OBJ_TAG) {
|
|
|
|
|
struct tag *t = (struct tag *) o;
|
|
|
|
|
if (!t->tagged)
|
|
|
|
|
break; /* broken repository */
|
|
|
|
|
o->flags |= COMPLETE;
|
|
|
|
|
o = parse_object(t->tagged->sha1);
|
|
|
|
|
}
|
|
|
|
|
if (o && o->type == OBJ_COMMIT) {
|
|
|
|
|
struct commit *commit = (struct commit *)o;
|
|
|
|
|
if (!(commit->object.flags & COMPLETE)) {
|
|
|
|
|
commit->object.flags |= COMPLETE;
|
fetch-pack: avoid quadratic list insertion in mark_complete
We insert the commit pointed to by each ref one-by-one into
the "complete" commit_list using insert_by_date. Because
each insertion is O(n), we end up with O(n^2) behavior.
This typically doesn't matter, because the number of refs is
reasonably small. And even if there are a lot of refs, they
often point to a smaller set of objects (in which case the
optimization in commit ea5f220 keeps our "n" small).
However, in pathological repositories (hundreds of thousands
of refs, each pointing to a unique commit), this quadratic
behavior can make a difference. Since we do not care about
the list order until we have finished building it, we can
simply keep it unsorted during the insertion phase, then
sort it afterwards.
On a repository like the one described above, this dropped
the time to do a no-op fetch from 2.0s to 1.7s. On normal
repositories, it probably does not matter at all, but it
does not hurt to protect ourselves from pathological cases.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:16:23 +08:00
|
|
|
commit_list_insert(commit, &complete);
|
2012-10-26 23:53:55 +08:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void mark_recent_complete_commits(struct fetch_pack_args *args,
|
|
|
|
|
unsigned long cutoff)
|
|
|
|
|
{
|
|
|
|
|
while (complete && cutoff <= complete->item->date) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Marking %s as complete\n",
|
|
|
|
|
sha1_to_hex(complete->item->object.sha1));
|
|
|
|
|
pop_most_recent_commit(&complete, COMPLETE);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void filter_refs(struct fetch_pack_args *args,
|
2013-01-30 06:02:15 +08:00
|
|
|
struct ref **refs,
|
|
|
|
|
struct ref **sought, int nr_sought)
|
2012-10-26 23:53:55 +08:00
|
|
|
{
|
|
|
|
|
struct ref *newlist = NULL;
|
|
|
|
|
struct ref **newtail = &newlist;
|
|
|
|
|
struct ref *ref, *next;
|
2013-01-30 06:02:15 +08:00
|
|
|
int i;
|
2012-10-26 23:53:55 +08:00
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
i = 0;
|
2012-10-26 23:53:55 +08:00
|
|
|
for (ref = *refs; ref; ref = next) {
|
|
|
|
|
int keep = 0;
|
|
|
|
|
next = ref->next;
|
2013-01-30 06:02:15 +08:00
|
|
|
|
2012-10-26 23:53:55 +08:00
|
|
|
if (!memcmp(ref->name, "refs/", 5) &&
|
|
|
|
|
check_refname_format(ref->name + 5, 0))
|
|
|
|
|
; /* trash */
|
|
|
|
|
else {
|
2013-01-30 06:02:15 +08:00
|
|
|
while (i < nr_sought) {
|
|
|
|
|
int cmp = strcmp(ref->name, sought[i]->name);
|
2012-10-26 23:53:55 +08:00
|
|
|
if (cmp < 0)
|
|
|
|
|
break; /* definitely do not have it */
|
|
|
|
|
else if (cmp == 0) {
|
|
|
|
|
keep = 1; /* definitely have it */
|
2013-01-30 06:02:15 +08:00
|
|
|
sought[i]->matched = 1;
|
2012-10-26 23:53:55 +08:00
|
|
|
}
|
2013-01-30 06:02:15 +08:00
|
|
|
i++;
|
2012-10-26 23:53:55 +08:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
if (!keep && args->fetch_all &&
|
2012-10-26 23:53:55 +08:00
|
|
|
(!args->depth || prefixcmp(ref->name, "refs/tags/")))
|
|
|
|
|
keep = 1;
|
|
|
|
|
|
|
|
|
|
if (keep) {
|
|
|
|
|
*newtail = ref;
|
|
|
|
|
ref->next = NULL;
|
|
|
|
|
newtail = &ref->next;
|
|
|
|
|
} else {
|
|
|
|
|
free(ref);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
/* Append unmatched requests to the list */
|
|
|
|
|
if (allow_tip_sha1_in_want) {
|
|
|
|
|
for (i = 0; i < nr_sought; i++) {
|
|
|
|
|
ref = sought[i];
|
|
|
|
|
if (ref->matched)
|
|
|
|
|
continue;
|
|
|
|
|
if (get_sha1_hex(ref->name, ref->old_sha1))
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
ref->matched = 1;
|
|
|
|
|
*newtail = ref;
|
|
|
|
|
ref->next = NULL;
|
|
|
|
|
newtail = &ref->next;
|
|
|
|
|
}
|
|
|
|
|
}
|
2012-10-26 23:53:55 +08:00
|
|
|
*refs = newlist;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void mark_alternate_complete(const struct ref *ref, void *unused)
|
|
|
|
|
{
|
|
|
|
|
mark_complete(NULL, ref->old_sha1, 0, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int everything_local(struct fetch_pack_args *args,
|
2013-01-30 06:02:15 +08:00
|
|
|
struct ref **refs,
|
|
|
|
|
struct ref **sought, int nr_sought)
|
2012-10-26 23:53:55 +08:00
|
|
|
{
|
|
|
|
|
struct ref *ref;
|
|
|
|
|
int retval;
|
|
|
|
|
unsigned long cutoff = 0;
|
|
|
|
|
|
|
|
|
|
save_commit_buffer = 0;
|
|
|
|
|
|
|
|
|
|
for (ref = *refs; ref; ref = ref->next) {
|
|
|
|
|
struct object *o;
|
|
|
|
|
|
2013-01-27 11:42:09 +08:00
|
|
|
if (!has_sha1_file(ref->old_sha1))
|
|
|
|
|
continue;
|
|
|
|
|
|
2012-10-26 23:53:55 +08:00
|
|
|
o = parse_object(ref->old_sha1);
|
|
|
|
|
if (!o)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
/* We already have it -- which may mean that we were
|
|
|
|
|
* in sync with the other side at some time after
|
|
|
|
|
* that (it is OK if we guess wrong here).
|
|
|
|
|
*/
|
|
|
|
|
if (o->type == OBJ_COMMIT) {
|
|
|
|
|
struct commit *commit = (struct commit *)o;
|
|
|
|
|
if (!cutoff || cutoff < commit->date)
|
|
|
|
|
cutoff = commit->date;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!args->depth) {
|
|
|
|
|
for_each_ref(mark_complete, NULL);
|
|
|
|
|
for_each_alternate_ref(mark_alternate_complete, NULL);
|
fetch-pack: avoid quadratic list insertion in mark_complete
We insert the commit pointed to by each ref one-by-one into
the "complete" commit_list using insert_by_date. Because
each insertion is O(n), we end up with O(n^2) behavior.
This typically doesn't matter, because the number of refs is
reasonably small. And even if there are a lot of refs, they
often point to a smaller set of objects (in which case the
optimization in commit ea5f220 keeps our "n" small).
However, in pathological repositories (hundreds of thousands
of refs, each pointing to a unique commit), this quadratic
behavior can make a difference. Since we do not care about
the list order until we have finished building it, we can
simply keep it unsorted during the insertion phase, then
sort it afterwards.
On a repository like the one described above, this dropped
the time to do a no-op fetch from 2.0s to 1.7s. On normal
repositories, it probably does not matter at all, but it
does not hurt to protect ourselves from pathological cases.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-02 14:16:23 +08:00
|
|
|
commit_list_sort_by_date(&complete);
|
2012-10-26 23:53:55 +08:00
|
|
|
if (cutoff)
|
|
|
|
|
mark_recent_complete_commits(args, cutoff);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Mark all complete remote refs as common refs.
|
|
|
|
|
* Don't mark them common yet; the server has to be told so first.
|
|
|
|
|
*/
|
|
|
|
|
for (ref = *refs; ref; ref = ref->next) {
|
|
|
|
|
struct object *o = deref_tag(lookup_object(ref->old_sha1),
|
|
|
|
|
NULL, 0);
|
|
|
|
|
|
|
|
|
|
if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
if (!(o->flags & SEEN)) {
|
|
|
|
|
rev_list_push((struct commit *)o, COMMON_REF | SEEN);
|
|
|
|
|
|
|
|
|
|
mark_common((struct commit *)o, 1, 1);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
filter_refs(args, refs, sought, nr_sought);
|
2012-10-26 23:53:55 +08:00
|
|
|
|
|
|
|
|
for (retval = 1, ref = *refs; ref ; ref = ref->next) {
|
|
|
|
|
const unsigned char *remote = ref->old_sha1;
|
|
|
|
|
unsigned char local[20];
|
|
|
|
|
struct object *o;
|
|
|
|
|
|
|
|
|
|
o = lookup_object(remote);
|
|
|
|
|
if (!o || !(o->flags & COMPLETE)) {
|
|
|
|
|
retval = 0;
|
|
|
|
|
if (!args->verbose)
|
|
|
|
|
continue;
|
|
|
|
|
fprintf(stderr,
|
|
|
|
|
"want %s (%s)\n", sha1_to_hex(remote),
|
|
|
|
|
ref->name);
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
hashcpy(ref->new_sha1, local);
|
|
|
|
|
if (!args->verbose)
|
|
|
|
|
continue;
|
|
|
|
|
fprintf(stderr,
|
|
|
|
|
"already have %s (%s)\n", sha1_to_hex(remote),
|
|
|
|
|
ref->name);
|
|
|
|
|
}
|
|
|
|
|
return retval;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int sideband_demux(int in, int out, void *data)
|
|
|
|
|
{
|
|
|
|
|
int *xd = data;
|
|
|
|
|
|
|
|
|
|
int ret = recv_sideband("fetch-pack", xd[0], out);
|
|
|
|
|
close(out);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int get_pack(struct fetch_pack_args *args,
|
|
|
|
|
int xd[2], char **pack_lockfile)
|
|
|
|
|
{
|
|
|
|
|
struct async demux;
|
2013-05-26 09:16:15 +08:00
|
|
|
const char *argv[22];
|
2012-10-26 23:53:55 +08:00
|
|
|
char keep_arg[256];
|
|
|
|
|
char hdr_arg[256];
|
2013-09-18 21:41:18 +08:00
|
|
|
const char **av, *cmd_name;
|
2012-10-26 23:53:55 +08:00
|
|
|
int do_keep = args->keep_pack;
|
|
|
|
|
struct child_process cmd;
|
2013-05-26 09:16:17 +08:00
|
|
|
int ret;
|
2012-10-26 23:53:55 +08:00
|
|
|
|
|
|
|
|
memset(&demux, 0, sizeof(demux));
|
|
|
|
|
if (use_sideband) {
|
|
|
|
|
/* xd[] is talking with upload-pack; subprocess reads from
|
|
|
|
|
* xd[0], spits out band#2 to stderr, and feeds us band#1
|
|
|
|
|
* through demux->out.
|
|
|
|
|
*/
|
|
|
|
|
demux.proc = sideband_demux;
|
|
|
|
|
demux.data = xd;
|
|
|
|
|
demux.out = -1;
|
|
|
|
|
if (start_async(&demux))
|
|
|
|
|
die("fetch-pack: unable to fork off sideband"
|
|
|
|
|
" demultiplexer");
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
demux.out = xd[0];
|
|
|
|
|
|
|
|
|
|
memset(&cmd, 0, sizeof(cmd));
|
|
|
|
|
cmd.argv = argv;
|
|
|
|
|
av = argv;
|
|
|
|
|
*hdr_arg = 0;
|
|
|
|
|
if (!args->keep_pack && unpack_limit) {
|
|
|
|
|
struct pack_header header;
|
|
|
|
|
|
|
|
|
|
if (read_pack_header(demux.out, &header))
|
|
|
|
|
die("protocol error: bad pack header");
|
|
|
|
|
snprintf(hdr_arg, sizeof(hdr_arg),
|
|
|
|
|
"--pack_header=%"PRIu32",%"PRIu32,
|
|
|
|
|
ntohl(header.hdr_version), ntohl(header.hdr_entries));
|
|
|
|
|
if (ntohl(header.hdr_entries) < unpack_limit)
|
|
|
|
|
do_keep = 0;
|
|
|
|
|
else
|
|
|
|
|
do_keep = 1;
|
|
|
|
|
}
|
|
|
|
|
|
2013-05-26 09:16:15 +08:00
|
|
|
if (alternate_shallow_file) {
|
|
|
|
|
*av++ = "--shallow-file";
|
|
|
|
|
*av++ = alternate_shallow_file;
|
|
|
|
|
}
|
|
|
|
|
|
2012-10-26 23:53:55 +08:00
|
|
|
if (do_keep) {
|
|
|
|
|
if (pack_lockfile)
|
|
|
|
|
cmd.out = -1;
|
2013-09-18 21:41:18 +08:00
|
|
|
*av++ = cmd_name = "index-pack";
|
2012-10-26 23:53:55 +08:00
|
|
|
*av++ = "--stdin";
|
|
|
|
|
if (!args->quiet && !args->no_progress)
|
|
|
|
|
*av++ = "-v";
|
|
|
|
|
if (args->use_thin_pack)
|
|
|
|
|
*av++ = "--fix-thin";
|
|
|
|
|
if (args->lock_pack || unpack_limit) {
|
|
|
|
|
int s = sprintf(keep_arg,
|
|
|
|
|
"--keep=fetch-pack %"PRIuMAX " on ", (uintmax_t) getpid());
|
|
|
|
|
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
|
|
|
|
|
strcpy(keep_arg + s, "localhost");
|
|
|
|
|
*av++ = keep_arg;
|
|
|
|
|
}
|
2013-05-26 09:16:17 +08:00
|
|
|
if (args->check_self_contained_and_connected)
|
|
|
|
|
*av++ = "--check-self-contained-and-connected";
|
2012-10-26 23:53:55 +08:00
|
|
|
}
|
|
|
|
|
else {
|
2013-09-18 21:41:18 +08:00
|
|
|
*av++ = cmd_name = "unpack-objects";
|
2012-10-26 23:53:55 +08:00
|
|
|
if (args->quiet || args->no_progress)
|
|
|
|
|
*av++ = "-q";
|
2013-05-26 09:16:17 +08:00
|
|
|
args->check_self_contained_and_connected = 0;
|
2012-10-26 23:53:55 +08:00
|
|
|
}
|
|
|
|
|
if (*hdr_arg)
|
|
|
|
|
*av++ = hdr_arg;
|
|
|
|
|
if (fetch_fsck_objects >= 0
|
|
|
|
|
? fetch_fsck_objects
|
|
|
|
|
: transfer_fsck_objects >= 0
|
|
|
|
|
? transfer_fsck_objects
|
|
|
|
|
: 0)
|
|
|
|
|
*av++ = "--strict";
|
|
|
|
|
*av++ = NULL;
|
|
|
|
|
|
|
|
|
|
cmd.in = demux.out;
|
|
|
|
|
cmd.git_cmd = 1;
|
|
|
|
|
if (start_command(&cmd))
|
2013-09-18 21:41:18 +08:00
|
|
|
die("fetch-pack: unable to fork off %s", cmd_name);
|
2012-10-26 23:53:55 +08:00
|
|
|
if (do_keep && pack_lockfile) {
|
|
|
|
|
*pack_lockfile = index_pack_lockfile(cmd.out);
|
|
|
|
|
close(cmd.out);
|
|
|
|
|
}
|
|
|
|
|
|
2013-10-22 21:36:02 +08:00
|
|
|
if (!use_sideband)
|
|
|
|
|
/* Closed by start_command() */
|
|
|
|
|
xd[0] = -1;
|
|
|
|
|
|
2013-05-26 09:16:17 +08:00
|
|
|
ret = finish_command(&cmd);
|
|
|
|
|
if (!ret || (args->check_self_contained_and_connected && ret == 1))
|
|
|
|
|
args->self_contained_and_connected =
|
|
|
|
|
args->check_self_contained_and_connected &&
|
|
|
|
|
ret == 0;
|
|
|
|
|
else
|
2013-09-18 21:41:18 +08:00
|
|
|
die("%s failed", cmd_name);
|
2012-10-26 23:53:55 +08:00
|
|
|
if (use_sideband && finish_async(&demux))
|
|
|
|
|
die("error in sideband demultiplexer");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
static int cmp_ref_by_name(const void *a_, const void *b_)
|
|
|
|
|
{
|
|
|
|
|
const struct ref *a = *((const struct ref **)a_);
|
|
|
|
|
const struct ref *b = *((const struct ref **)b_);
|
|
|
|
|
return strcmp(a->name, b->name);
|
|
|
|
|
}
|
|
|
|
|
|
2012-10-26 23:53:55 +08:00
|
|
|
static struct ref *do_fetch_pack(struct fetch_pack_args *args,
|
|
|
|
|
int fd[2],
|
|
|
|
|
const struct ref *orig_ref,
|
2013-01-30 06:02:15 +08:00
|
|
|
struct ref **sought, int nr_sought,
|
2013-12-05 21:02:39 +08:00
|
|
|
struct shallow_info *si,
|
2012-10-26 23:53:55 +08:00
|
|
|
char **pack_lockfile)
|
|
|
|
|
{
|
|
|
|
|
struct ref *ref = copy_ref_list(orig_ref);
|
|
|
|
|
unsigned char sha1[20];
|
|
|
|
|
const char *agent_feature;
|
|
|
|
|
int agent_len;
|
|
|
|
|
|
|
|
|
|
sort_ref_list(&ref, ref_compare_name);
|
2013-01-30 06:02:15 +08:00
|
|
|
qsort(sought, nr_sought, sizeof(*sought), cmp_ref_by_name);
|
2012-10-26 23:53:55 +08:00
|
|
|
|
|
|
|
|
if (is_repository_shallow() && !server_supports("shallow"))
|
|
|
|
|
die("Server does not support shallow clients");
|
|
|
|
|
if (server_supports("multi_ack_detailed")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports multi_ack_detailed\n");
|
|
|
|
|
multi_ack = 2;
|
|
|
|
|
if (server_supports("no-done")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports no-done\n");
|
|
|
|
|
if (args->stateless_rpc)
|
|
|
|
|
no_done = 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
else if (server_supports("multi_ack")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports multi_ack\n");
|
|
|
|
|
multi_ack = 1;
|
|
|
|
|
}
|
|
|
|
|
if (server_supports("side-band-64k")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports side-band-64k\n");
|
|
|
|
|
use_sideband = 2;
|
|
|
|
|
}
|
|
|
|
|
else if (server_supports("side-band")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports side-band\n");
|
|
|
|
|
use_sideband = 1;
|
|
|
|
|
}
|
2013-01-30 06:02:15 +08:00
|
|
|
if (server_supports("allow-tip-sha1-in-want")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports allow-tip-sha1-in-want\n");
|
|
|
|
|
allow_tip_sha1_in_want = 1;
|
|
|
|
|
}
|
2012-10-26 23:53:55 +08:00
|
|
|
if (!server_supports("thin-pack"))
|
|
|
|
|
args->use_thin_pack = 0;
|
|
|
|
|
if (!server_supports("no-progress"))
|
|
|
|
|
args->no_progress = 0;
|
|
|
|
|
if (!server_supports("include-tag"))
|
|
|
|
|
args->include_tag = 0;
|
|
|
|
|
if (server_supports("ofs-delta")) {
|
|
|
|
|
if (args->verbose)
|
|
|
|
|
fprintf(stderr, "Server supports ofs-delta\n");
|
|
|
|
|
} else
|
|
|
|
|
prefer_ofs_delta = 0;
|
|
|
|
|
|
|
|
|
|
if ((agent_feature = server_feature_value("agent", &agent_len))) {
|
|
|
|
|
agent_supported = 1;
|
|
|
|
|
if (args->verbose && agent_len)
|
|
|
|
|
fprintf(stderr, "Server version is %.*s\n",
|
|
|
|
|
agent_len, agent_feature);
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
if (everything_local(args, &ref, sought, nr_sought)) {
|
2012-10-26 23:53:55 +08:00
|
|
|
packet_flush(fd[1]);
|
|
|
|
|
goto all_done;
|
|
|
|
|
}
|
|
|
|
|
if (find_common(args, fd, sha1, ref) < 0)
|
|
|
|
|
if (!args->keep_pack)
|
|
|
|
|
/* When cloning, it is not unusual to have
|
|
|
|
|
* no common commit.
|
|
|
|
|
*/
|
|
|
|
|
warning("no common commits");
|
|
|
|
|
|
|
|
|
|
if (args->stateless_rpc)
|
|
|
|
|
packet_flush(fd[1]);
|
2013-05-26 09:16:15 +08:00
|
|
|
if (args->depth > 0)
|
2013-12-05 21:02:34 +08:00
|
|
|
setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
|
|
|
|
|
NULL);
|
2013-12-05 21:02:39 +08:00
|
|
|
else if (args->cloning && si->shallow && si->shallow->nr)
|
|
|
|
|
alternate_shallow_file = setup_temporary_shallow(si->shallow);
|
2013-08-26 10:17:26 +08:00
|
|
|
else
|
|
|
|
|
alternate_shallow_file = NULL;
|
2012-10-26 23:53:55 +08:00
|
|
|
if (get_pack(args, fd, pack_lockfile))
|
|
|
|
|
die("git fetch-pack: fetch failed.");
|
|
|
|
|
|
|
|
|
|
all_done:
|
|
|
|
|
return ref;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int fetch_pack_config(const char *var, const char *value, void *cb)
|
|
|
|
|
{
|
|
|
|
|
if (strcmp(var, "fetch.unpacklimit") == 0) {
|
|
|
|
|
fetch_unpack_limit = git_config_int(var, value);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (strcmp(var, "transfer.unpacklimit") == 0) {
|
|
|
|
|
transfer_unpack_limit = git_config_int(var, value);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
|
|
|
|
|
prefer_ofs_delta = git_config_bool(var, value);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!strcmp(var, "fetch.fsckobjects")) {
|
|
|
|
|
fetch_fsck_objects = git_config_bool(var, value);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!strcmp(var, "transfer.fsckobjects")) {
|
|
|
|
|
transfer_fsck_objects = git_config_bool(var, value);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return git_default_config(var, value, cb);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void fetch_pack_setup(void)
|
|
|
|
|
{
|
|
|
|
|
static int did_setup;
|
|
|
|
|
if (did_setup)
|
|
|
|
|
return;
|
|
|
|
|
git_config(fetch_pack_config, NULL);
|
|
|
|
|
if (0 <= transfer_unpack_limit)
|
|
|
|
|
unpack_limit = transfer_unpack_limit;
|
|
|
|
|
else if (0 <= fetch_unpack_limit)
|
|
|
|
|
unpack_limit = fetch_unpack_limit;
|
|
|
|
|
did_setup = 1;
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-30 06:02:15 +08:00
|
|
|
static int remove_duplicates_in_refs(struct ref **ref, int nr)
|
|
|
|
|
{
|
|
|
|
|
struct string_list names = STRING_LIST_INIT_NODUP;
|
|
|
|
|
int src, dst;
|
|
|
|
|
|
|
|
|
|
for (src = dst = 0; src < nr; src++) {
|
|
|
|
|
struct string_list_item *item;
|
|
|
|
|
item = string_list_insert(&names, ref[src]->name);
|
|
|
|
|
if (item->util)
|
|
|
|
|
continue; /* already have it */
|
|
|
|
|
item->util = ref[src];
|
|
|
|
|
if (src != dst)
|
|
|
|
|
ref[dst] = ref[src];
|
|
|
|
|
dst++;
|
|
|
|
|
}
|
|
|
|
|
for (src = dst; src < nr; src++)
|
|
|
|
|
ref[src] = NULL;
|
|
|
|
|
string_list_clear(&names, 0);
|
|
|
|
|
return dst;
|
|
|
|
|
}
|
|
|
|
|
|
2013-12-05 21:02:39 +08:00
|
|
|
static void update_shallow(struct fetch_pack_args *args,
|
|
|
|
|
struct shallow_info *si)
|
2013-12-05 21:02:37 +08:00
|
|
|
{
|
2013-12-05 21:02:39 +08:00
|
|
|
int i;
|
|
|
|
|
|
2013-12-05 21:02:37 +08:00
|
|
|
if (args->depth > 0 && alternate_shallow_file) {
|
|
|
|
|
if (*alternate_shallow_file == '\0') { /* --unshallow */
|
|
|
|
|
unlink_or_warn(git_path("shallow"));
|
|
|
|
|
rollback_lock_file(&shallow_lock);
|
|
|
|
|
} else
|
|
|
|
|
commit_lock_file(&shallow_lock);
|
|
|
|
|
return;
|
|
|
|
|
}
|
2013-12-05 21:02:39 +08:00
|
|
|
|
|
|
|
|
if (!si->shallow || !si->shallow->nr)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (alternate_shallow_file) {
|
|
|
|
|
/*
|
|
|
|
|
* The temporary shallow file is only useful for
|
|
|
|
|
* index-pack and unpack-objects because it may
|
|
|
|
|
* contain more roots than we want. Delete it.
|
|
|
|
|
*/
|
|
|
|
|
if (*alternate_shallow_file)
|
|
|
|
|
unlink(alternate_shallow_file);
|
|
|
|
|
free((char *)alternate_shallow_file);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (args->cloning) {
|
|
|
|
|
/*
|
|
|
|
|
* remote is shallow, but this is a clone, there are
|
|
|
|
|
* no objects in repo to worry about. Accept any
|
|
|
|
|
* shallow points that exist in the pack (iow in repo
|
|
|
|
|
* after get_pack() and reprepare_packed_git())
|
|
|
|
|
*/
|
|
|
|
|
struct sha1_array extra = SHA1_ARRAY_INIT;
|
|
|
|
|
unsigned char (*sha1)[20] = si->shallow->sha1;
|
|
|
|
|
for (i = 0; i < si->shallow->nr; i++)
|
|
|
|
|
if (has_sha1_file(sha1[i]))
|
|
|
|
|
sha1_array_append(&extra, sha1[i]);
|
|
|
|
|
if (extra.nr) {
|
|
|
|
|
setup_alternate_shallow(&shallow_lock,
|
|
|
|
|
&alternate_shallow_file,
|
|
|
|
|
&extra);
|
|
|
|
|
commit_lock_file(&shallow_lock);
|
|
|
|
|
}
|
|
|
|
|
sha1_array_clear(&extra);
|
|
|
|
|
return;
|
|
|
|
|
}
|
2013-12-05 21:02:37 +08:00
|
|
|
}
|
|
|
|
|
|
2012-10-26 23:53:55 +08:00
|
|
|
struct ref *fetch_pack(struct fetch_pack_args *args,
|
|
|
|
|
int fd[], struct child_process *conn,
|
|
|
|
|
const struct ref *ref,
|
|
|
|
|
const char *dest,
|
2013-01-30 06:02:15 +08:00
|
|
|
struct ref **sought, int nr_sought,
|
2013-12-05 21:02:39 +08:00
|
|
|
struct sha1_array *shallow,
|
2012-10-26 23:53:55 +08:00
|
|
|
char **pack_lockfile)
|
|
|
|
|
{
|
|
|
|
|
struct ref *ref_cpy;
|
2013-12-05 21:02:39 +08:00
|
|
|
struct shallow_info si;
|
2012-10-26 23:53:55 +08:00
|
|
|
|
|
|
|
|
fetch_pack_setup();
|
2013-01-30 06:02:15 +08:00
|
|
|
if (nr_sought)
|
|
|
|
|
nr_sought = remove_duplicates_in_refs(sought, nr_sought);
|
2012-10-26 23:53:55 +08:00
|
|
|
|
|
|
|
|
if (!ref) {
|
|
|
|
|
packet_flush(fd[1]);
|
|
|
|
|
die("no matching remote head");
|
|
|
|
|
}
|
2013-12-05 21:02:39 +08:00
|
|
|
prepare_shallow_info(&si, shallow);
|
|
|
|
|
ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
|
|
|
|
|
&si, pack_lockfile);
|
2012-10-26 23:53:55 +08:00
|
|
|
reprepare_packed_git();
|
2013-12-05 21:02:39 +08:00
|
|
|
update_shallow(args, &si);
|
|
|
|
|
clear_shallow_info(&si);
|
2012-10-26 23:53:55 +08:00
|
|
|
return ref_cpy;
|
|
|
|
|
}
|
