transport-internal.h

   1 #ifndef TRANSPORT_INTERNAL_H
   2 #define TRANSPORT_INTERNAL_H
   3
   4 struct ref;
   5 struct transport;
   6 struct strvec;
   7
   8 struct transport_vtable {
   9         /**
  10          * Returns 0 if successful, positive if the option is not
  11          * recognized or is inapplicable, and negative if the option
  12          * is applicable but the value is invalid.
  13          **/
  14         int (*set_option)(struct transport *connection, const char *name,
  15                           const char *value);
  16         /**
  17          * Returns a list of the remote side's refs. In order to allow
  18          * the transport to try to share connections, for_push is a
  19          * hint as to whether the ultimate operation is a push or a fetch.
  20          *
  21          * If communicating using protocol v2 a list of prefixes can be
  22          * provided to be sent to the server to enable it to limit the ref
  23          * advertisement.  Since ref filtering is done on the server's end, and
  24          * only when using protocol v2, this list will be ignored when not
  25          * using protocol v2 meaning this function can return refs which don't
  26          * match the provided ref_prefixes.
  27          *
  28          * If the transport is able to determine the remote hash for
  29          * the ref without a huge amount of effort, it should store it
  30          * in the ref's old_sha1 field; otherwise it should be all 0.
  31          **/
  32         struct ref *(*get_refs_list)(struct transport *transport, int for_push,
  33                                      const struct strvec *ref_prefixes);
  34
  35         /**
  36          * Fetch the objects for the given refs. Note that this gets
  37          * an array, and should ignore the list structure.
  38          *
  39          * If the transport did not get hashes for refs in
  40          * get_refs_list(), it should set the old_sha1 fields in the
  41          * provided refs now.
  42          **/
  43         int (*fetch)(struct transport *transport, int refs_nr, struct ref **refs);
  44
  45         /**
  46          * Push the objects and refs. Send the necessary objects, and
  47          * then, for any refs where peer_ref is set and
  48          * peer_ref->new_oid is different from old_oid, tell the
  49          * remote side to update each ref in the list from old_oid to
  50          * peer_ref->new_oid.
  51          *
  52          * Where possible, set the status for each ref appropriately.
  53          *
  54          * The transport must modify new_sha1 in the ref to the new
  55          * value if the remote accepted the change. Note that this
  56          * could be a different value from peer_ref->new_oid if the
  57          * process involved generating new commits.
  58          **/
  59         int (*push_refs)(struct transport *transport, struct ref *refs, int flags);
  60         int (*connect)(struct transport *connection, const char *name,
  61                        const char *executable, int fd[2]);
  62
  63         /** get_refs_list(), fetch(), and push_refs() can keep
  64          * resources (such as a connection) reserved for further
  65          * use. disconnect() releases these resources.
  66          **/
  67         int (*disconnect)(struct transport *connection);
  68 };
  69
  70 #endif