$ git clone -n https://src.fedoraproject.org/rpms/libwnck3.git /var/lib/mock/f41-build-856458-167621/root/chroot_tmpdir/scmroot/libwnck3
Cloning into '/var/lib/mock/f41-build-856458-167621/root/chroot_tmpdir/scmroot/libwnck3'...
$ git fetch origin 67d1fabe9cf8b057367f723ebadf0b3ebfbc0953:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libwnck3
 * [new ref]         67d1fabe9cf8b057367f723ebadf0b3ebfbc0953 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67d1fab update to 43.1