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upload-pack: ignore 'shallow' lines with unknown obj-ids

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When the client sends a 'shallow' line for an object that the server does
not have, the server currently dies with the error: "did not find object
for shallow <obj-id>".  The client may have truncated the history at
the commit by fetching shallowly from a different server, or the commit
may have been garbage collected by the server. In either case, this
unknown commit is not relevant for calculating the pack that is to be
sent and can be safely ignored, and it is not used when recomputing where
the updated history of the client is cauterised.

The documentation in technical/pack-protocol.txt has been updated to
remove the restriction that "Clients MUST NOT mention an obj-id which it
does not know exists on the server". This requirement is not realistic
because clients cannot know whether an object has been garbage collected
by the server.

Signed-off-by: Michael Heemskerk <mheemskerk@atlassian.com>
Reviewed-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Heemskerk 2013-04-28 22:32:04 -07:00 committed by Junio C Hamano
parent b75cdfaa88
commit af04fa2a78
2 changed files with 2 additions and 3 deletions
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3
Documentation/technical/pack-protocol.txt
View File

@ -228,8 +228,7 @@ obtained through ref discovery.
The client MUST write all obj-ids which it only has shallow copies
of (meaning that it does not have the parents of a commit) as
'shallow' lines so that the server is aware of the limitations of
the client's history. Clients MUST NOT mention an obj-id which
it does not know exists on the server.
the client's history.
The client now sends the maximum commit history depth it wants for
this transaction, which is the number of commits it wants from the

2
upload-pack.c
View File

@ -592,7 +592,7 @@ static void receive_needs(void)
die("invalid shallow line: %s", line);
object = parse_object(sha1);
if (!object)
die("did not find object for %s", line);
continue;
if (object->type != OBJ_COMMIT)
die("invalid shallow object %s", sha1_to_hex(sha1));
if (!(object->flags & CLIENT_SHALLOW)) {