$ git clone -n https://src.fedoraproject.org/rpms/rust-uucore.git /var/lib/mock/f40-build-1971917-25224/root/chroot_tmpdir/scmroot/rust-uucore
Cloning into '/var/lib/mock/f40-build-1971917-25224/root/chroot_tmpdir/scmroot/rust-uucore'...
$ git fetch origin ffbaae029d37c5e2c34c8d7dfca209fb610d0e68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uucore
 * [new ref]         ffbaae029d37c5e2c34c8d7dfca209fb610d0e68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffbaae0 Update to version 0.0.27; Fixes: RHBZ#2260197