$ git clone -n https://src.fedoraproject.org/rpms/rust-schemars.git /var/lib/mock/f45-build-44704-816/root/chroot_tmpdir/scmroot/rust-schemars
Cloning into '/var/lib/mock/f45-build-44704-816/root/chroot_tmpdir/scmroot/rust-schemars'...
$ git fetch origin f8c31cd7c78119e76867f5bfc939b9708c3bc683:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-schemars
 * [new ref]         f8c31cd7c78119e76867f5bfc939b9708c3bc683 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8c31cd Allow validator 0.21 in dev-dependency