$ git clone -n https://src.fedoraproject.org/rpms/rust-kvm-ioctls0.21.git /var/lib/mock/f45-build-42813-796/root/chroot_tmpdir/scmroot/rust-kvm-ioctls0.21
Cloning into '/var/lib/mock/f45-build-42813-796/root/chroot_tmpdir/scmroot/rust-kvm-ioctls0.21'...
$ git fetch origin ce227c72f2744497d8dde35fbeff01fc08f1cb6c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-kvm-ioctls0.21
 * [new ref]         ce227c72f2744497d8dde35fbeff01fc08f1cb6c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce227c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild