$ git clone -n https://src.fedoraproject.org/rpms/rust-imperative.git /var/lib/mock/f45-build-42535-794/root/chroot_tmpdir/scmroot/rust-imperative
Cloning into '/var/lib/mock/f45-build-42535-794/root/chroot_tmpdir/scmroot/rust-imperative'...
$ git fetch origin eac12cc82ac5f7345541786a1d38d667ed8c6001:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-imperative
 * [new ref]         eac12cc82ac5f7345541786a1d38d667ed8c6001 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eac12cc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild