$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-util.git /var/lib/mock/f40-build-2091768-50242/root/chroot_tmpdir/scmroot/rust-cargo-util
Cloning into '/var/lib/mock/f40-build-2091768-50242/root/chroot_tmpdir/scmroot/rust-cargo-util'...
$ git fetch origin 7e6b279a673e5b8b73550dbe9ebf916717de4c10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-util
 * [new ref]         7e6b279a673e5b8b73550dbe9ebf916717de4c10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e6b279 Update to version 0.2.7; Fixes RHBZ#2250483