transport-internal.h

   1 #ifndef TRANSPORT_INTERNAL_H
   2 #define TRANSPORT_INTERNAL_H
   3
   4 struct ref;
   5 struct transport;
   6 struct argv_array;
   7
   8 struct transport_vtable {
   9         /**
  10          * This transport supports the fetch() function being called
  11          * without get_refs_list() first being called.
  12          */
  13         unsigned fetch_without_list : 1;
  14
  15         /**
  16          * Returns 0 if successful, positive if the option is not
  17          * recognized or is inapplicable, and negative if the option
  18          * is applicable but the value is invalid.
  19          **/
  20         int (*set_option)(struct transport *connection, const char *name,
  21                           const char *value);
  22         /**
  23          * Returns a list of the remote side's refs. In order to allow
  24          * the transport to try to share connections, for_push is a
  25          * hint as to whether the ultimate operation is a push or a fetch.
  26          *
  27          * If communicating using protocol v2 a list of prefixes can be
  28          * provided to be sent to the server to enable it to limit the ref
  29          * advertisement.  Since ref filtering is done on the server's end, and
  30          * only when using protocol v2, this list will be ignored when not
  31          * using protocol v2 meaning this function can return refs which don't
  32          * match the provided ref_prefixes.
  33          *
  34          * If the transport is able to determine the remote hash for
  35          * the ref without a huge amount of effort, it should store it
  36          * in the ref's old_sha1 field; otherwise it should be all 0.
  37          **/
  38         struct ref *(*get_refs_list)(struct transport *transport, int for_push,
  39                                      const struct argv_array *ref_prefixes);
  40
  41         /**
  42          * Fetch the objects for the given refs. Note that this gets
  43          * an array, and should ignore the list structure.
  44          *
  45          * If the transport did not get hashes for refs in
  46          * get_refs_list(), it should set the old_sha1 fields in the
  47          * provided refs now.
  48          **/
  49         int (*fetch)(struct transport *transport, int refs_nr, struct ref **refs);
  50
  51         /**
  52          * Push the objects and refs. Send the necessary objects, and
  53          * then, for any refs where peer_ref is set and
  54          * peer_ref->new_oid is different from old_oid, tell the
  55          * remote side to update each ref in the list from old_oid to
  56          * peer_ref->new_oid.
  57          *
  58          * Where possible, set the status for each ref appropriately.
  59          *
  60          * The transport must modify new_sha1 in the ref to the new
  61          * value if the remote accepted the change. Note that this
  62          * could be a different value from peer_ref->new_oid if the
  63          * process involved generating new commits.
  64          **/
  65         int (*push_refs)(struct transport *transport, struct ref *refs, int flags);
  66         int (*connect)(struct transport *connection, const char *name,
  67                        const char *executable, int fd[2]);
  68
  69         /** get_refs_list(), fetch(), and push_refs() can keep
  70          * resources (such as a connection) reserved for further
  71          * use. disconnect() releases these resources.
  72          **/
  73         int (*disconnect)(struct transport *connection);
  74 };
  75
  76 #endif