$ git clone -n https://src.fedoraproject.org/rpms/mcrypt.git /var/lib/mock/f45-build-18166-510/root/chroot_tmpdir/scmroot/mcrypt
Cloning into '/var/lib/mock/f45-build-18166-510/root/chroot_tmpdir/scmroot/mcrypt'...
$ git fetch origin e8494186a357927ec2aaf534410a3060ac16da57:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mcrypt
 * [new ref]         e8494186a357927ec2aaf534410a3060ac16da57 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e849418 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild