$ git clone -n https://src.fedoraproject.org/rpms/rust-validator_derive.git /var/lib/mock/f45-build-46038-830/root/chroot_tmpdir/scmroot/rust-validator_derive
Cloning into '/var/lib/mock/f45-build-46038-830/root/chroot_tmpdir/scmroot/rust-validator_derive'...
$ git fetch origin 7eee671e1b5644df1ae0407294c88f7ada2e81a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-validator_derive
 * [new ref]         7eee671e1b5644df1ae0407294c88f7ada2e81a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7eee671 Update to version 0.20.1; Fixes RHBZ#2498844