$ git clone -n https://src.fedoraproject.org/rpms/libscrypt.git /var/lib/mock/f45-build-16936-493/root/chroot_tmpdir/scmroot/libscrypt
Cloning into '/var/lib/mock/f45-build-16936-493/root/chroot_tmpdir/scmroot/libscrypt'...
$ git fetch origin 4aee5a23e03d18127bcfb480fa9fe810bf245e92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libscrypt
 * [new ref]         4aee5a23e03d18127bcfb480fa9fe810bf245e92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4aee5a2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild