$ git clone -n https://src.fedoraproject.org/rpms/perl-CryptX.git /var/lib/mock/f42-build-side-1-3582697-46886/root/chroot_tmpdir/scmroot/perl-CryptX
Cloning into '/var/lib/mock/f42-build-side-1-3582697-46886/root/chroot_tmpdir/scmroot/perl-CryptX'...
$ git fetch origin 281c9607b5a648404606251eae5902468985c197:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CryptX
 * [new ref]         281c9607b5a648404606251eae5902468985c197 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 281c960 Bump release