$ git clone -n https://src.fedoraproject.org/rpms/swig.git /var/lib/mock/f40-build-2478391-61607/root/chroot_tmpdir/scmroot/swig
Cloning into '/var/lib/mock/f40-build-2478391-61607/root/chroot_tmpdir/scmroot/swig'...
$ git fetch origin 48a62aa0308bfeddb664c873857a6989eee87b83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swig
 * [new ref]         48a62aa0308bfeddb664c873857a6989eee87b83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48a62aa 4.2.1 bump (rhbz#2265786)