$ git clone -n https://src.fedoraproject.org/rpms/cyrus-sasl.git /var/lib/mock/f42-build-3308857-41426/root/chroot_tmpdir/scmroot/cyrus-sasl
Cloning into '/var/lib/mock/f42-build-3308857-41426/root/chroot_tmpdir/scmroot/cyrus-sasl'...
$ git fetch origin b6ba349d97bd88cbd6022107bc8111ffc870f98b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cyrus-sasl
 * [new ref]         b6ba349d97bd88cbd6022107bc8111ffc870f98b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6ba349 Add explicit BR: libxcrypt-devel