$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_cut.git /var/lib/mock/f40-build-1971908-25224/root/chroot_tmpdir/scmroot/rust-uu_cut
Cloning into '/var/lib/mock/f40-build-1971908-25224/root/chroot_tmpdir/scmroot/rust-uu_cut'...
$ git fetch origin 17bf2143cb56066cbe4bac4a57c5a45b0f1c8a21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_cut
 * [new ref]         17bf2143cb56066cbe4bac4a57c5a45b0f1c8a21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17bf214 Update to version 0.0.27; Fixes: RHBZ#2260202