$ git clone -n https://src.fedoraproject.org/rpms/rust-itertools0.12.git /var/lib/mock/f45-build-42737-796/root/chroot_tmpdir/scmroot/rust-itertools0.12
Cloning into '/var/lib/mock/f45-build-42737-796/root/chroot_tmpdir/scmroot/rust-itertools0.12'...
$ git fetch origin bca461b494f3f3e56755491a218a0bd386c39558:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-itertools0.12
 * [new ref]         bca461b494f3f3e56755491a218a0bd386c39558 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bca461b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild