$ git clone -n https://src.fedoraproject.org/rpms/libtirpc.git /var/lib/mock/f41-build-826377-154904/root/chroot_tmpdir/scmroot/libtirpc
Cloning into '/var/lib/mock/f41-build-826377-154904/root/chroot_tmpdir/scmroot/libtirpc'...
$ git fetch origin 4658cf427b71c1c791b1b1a2c1c55922694d4505:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtirpc
 * [new ref]         4658cf427b71c1c791b1b1a2c1c55922694d4505 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4658cf4 Updated to latest upstream release: libtirpc-1-3-5