$ git clone -n https://src.fedoraproject.org/rpms/tinc.git /var/lib/mock/f41-build-855996-167435/root/chroot_tmpdir/scmroot/tinc
Cloning into '/var/lib/mock/f41-build-855996-167435/root/chroot_tmpdir/scmroot/tinc'...
$ git fetch origin 532c1e18972b8b51e63e05542fdfc973a95607f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tinc
 * [new ref]         532c1e18972b8b51e63e05542fdfc973a95607f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 532c1e1 Fix FTBFS (closes rhbz#2301329)