$ git clone -n https://src.fedoraproject.org/rpms/libblkio.git /var/lib/mock/f45-build-39655-750/root/chroot_tmpdir/scmroot/libblkio
Cloning into '/var/lib/mock/f45-build-39655-750/root/chroot_tmpdir/scmroot/libblkio'...
$ git fetch origin c6d44619d18ff2c04927ce7c379fb5fcc89178fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libblkio
 * [new ref]         c6d44619d18ff2c04927ce7c379fb5fcc89178fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6d4461 Remove rustfmt