$ git clone -n https://src.fedoraproject.org/rpms/rust-randomize.git /var/lib/mock/f41-build-side-1-3134899-39763/root/chroot_tmpdir/scmroot/rust-randomize
Cloning into '/var/lib/mock/f41-build-side-1-3134899-39763/root/chroot_tmpdir/scmroot/rust-randomize'...
$ git fetch origin 4284918fd5630e86bf192c658e1436abf171560c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-randomize
 * [new ref]         4284918fd5630e86bf192c658e1436abf171560c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4284918 no longer needed