$ git clone -n https://src.fedoraproject.org/rpms/rust-validator.git /var/lib/mock/f45-build-46031-830/root/chroot_tmpdir/scmroot/rust-validator
Cloning into '/var/lib/mock/f45-build-46031-830/root/chroot_tmpdir/scmroot/rust-validator'...
$ git fetch origin 1293e1c11b917f1f15be323e2fe333441b8edc76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-validator
 * [new ref]         1293e1c11b917f1f15be323e2fe333441b8edc76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1293e1c Update to version 0.21.0; Fixes RHBZ#2520212