mirror of
https://github.com/git/git.git
synced 2024-05-12 15:16:09 +02:00
e2842b39f4
When a user fetches: - at least one up-to-date ref and at least one non-up-to-date ref, - using HTTP with protocol v0 (or something else that uses the fetch command of a remote helper) some refs might not be updated after the fetch. This bug was introduced in commit989b8c4452("fetch-pack: put shallow info in output parameter", 2018-06-28) which allowed transports to report the refs that they have fetched in a new out-parameter "fetched_refs". If they do so, transport_fetch_refs() makes this information available to its caller. Users of "fetched_refs" rely on the following 3 properties: (1) it is the complete list of refs that was passed to transport_fetch_refs(), (2) it has shallow information (REF_STATUS_REJECT_SHALLOW set if relevant), and (3) it has updated OIDs if ref-in-want was used (introduced after989b8c4452). In an effort to satisfy (1), whenever transport_fetch_refs() filters the refs sent to the transport, it re-adds the filtered refs to whatever the transport supplies before returning it to the user. However, the implementation in989b8c4452unconditionally re-adds the filtered refs without checking if the transport refrained from reporting anything in "fetched_refs" (which it is allowed to do), resulting in an incomplete list, no longer satisfying (1). An earlier effort to resolve this [1] solved the issue by readding the filtered refs only if the transport did not refrain from reporting in "fetched_refs", but after further discussion, it seems that the better solution is to revert the API change that introduced "fetched_refs". This API change was first suggested as part of a ref-in-want implementation that allowed for ref patterns and, thus, there could be drastic differences between the input refs and the refs actually fetched [2]; we eventually decided to only allow exact ref names, but this API change remained even though its necessity was decreased. Therefore, revert this API change by reverting commit989b8c4452, and make receive_wanted_refs() update the OIDs in the sought array (like how update_shallow() updates shallow information in the sought array) instead. A test is also included to show that the user-visible bug discussed at the beginning of this commit message no longer exists. [1] https://public-inbox.org/git/20180801171806.GA122458@google.com/ [2] https://public-inbox.org/git/86a128c5fb710a41791e7183207c4d64889f9307.1485381677.git.jonathantanmy@google.com/ Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
#ifndef TRANSPORT_INTERNAL_H
|
|
#define TRANSPORT_INTERNAL_H
|
|
|
|
struct ref;
|
|
struct transport;
|
|
struct argv_array;
|
|
|
|
struct transport_vtable {
|
|
/**
|
|
* Returns 0 if successful, positive if the option is not
|
|
* recognized or is inapplicable, and negative if the option
|
|
* is applicable but the value is invalid.
|
|
**/
|
|
int (*set_option)(struct transport *connection, const char *name,
|
|
const char *value);
|
|
/**
|
|
* Returns a list of the remote side's refs. In order to allow
|
|
* the transport to try to share connections, for_push is a
|
|
* hint as to whether the ultimate operation is a push or a fetch.
|
|
*
|
|
* If communicating using protocol v2 a list of prefixes can be
|
|
* provided to be sent to the server to enable it to limit the ref
|
|
* advertisement. Since ref filtering is done on the server's end, and
|
|
* only when using protocol v2, this list will be ignored when not
|
|
* using protocol v2 meaning this function can return refs which don't
|
|
* match the provided ref_prefixes.
|
|
*
|
|
* If the transport is able to determine the remote hash for
|
|
* the ref without a huge amount of effort, it should store it
|
|
* in the ref's old_sha1 field; otherwise it should be all 0.
|
|
**/
|
|
struct ref *(*get_refs_list)(struct transport *transport, int for_push,
|
|
const struct argv_array *ref_prefixes);
|
|
|
|
/**
|
|
* Fetch the objects for the given refs. Note that this gets
|
|
* an array, and should ignore the list structure.
|
|
*
|
|
* If the transport did not get hashes for refs in
|
|
* get_refs_list(), it should set the old_sha1 fields in the
|
|
* provided refs now.
|
|
**/
|
|
int (*fetch)(struct transport *transport, int refs_nr, struct ref **refs);
|
|
|
|
/**
|
|
* Push the objects and refs. Send the necessary objects, and
|
|
* then, for any refs where peer_ref is set and
|
|
* peer_ref->new_oid is different from old_oid, tell the
|
|
* remote side to update each ref in the list from old_oid to
|
|
* peer_ref->new_oid.
|
|
*
|
|
* Where possible, set the status for each ref appropriately.
|
|
*
|
|
* The transport must modify new_sha1 in the ref to the new
|
|
* value if the remote accepted the change. Note that this
|
|
* could be a different value from peer_ref->new_oid if the
|
|
* process involved generating new commits.
|
|
**/
|
|
int (*push_refs)(struct transport *transport, struct ref *refs, int flags);
|
|
int (*connect)(struct transport *connection, const char *name,
|
|
const char *executable, int fd[2]);
|
|
|
|
/** get_refs_list(), fetch(), and push_refs() can keep
|
|
* resources (such as a connection) reserved for further
|
|
* use. disconnect() releases these resources.
|
|
**/
|
|
int (*disconnect)(struct transport *connection);
|
|
};
|
|
|
|
#endif
|