$ git clone -n https://src.fedoraproject.org/rpms/rust-object.git /var/lib/mock/f45-build-43490-803/root/chroot_tmpdir/scmroot/rust-object
Cloning into '/var/lib/mock/f45-build-43490-803/root/chroot_tmpdir/scmroot/rust-object'...
$ git fetch origin 8e7ed7657ffe373e171606da0fdd424614bcacfb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-object
 * [new ref]         8e7ed7657ffe373e171606da0fdd424614bcacfb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e7ed76 Update to version 0.39.1