$ git clone -n https://src.fedoraproject.org/rpms/rust-rustsec.git /var/lib/mock/f40-build-2727718-73140/root/chroot_tmpdir/scmroot/rust-rustsec
Cloning into '/var/lib/mock/f40-build-2727718-73140/root/chroot_tmpdir/scmroot/rust-rustsec'...
$ git fetch origin 3136ac1144a1e37afb5b393dae3d310cb2843365:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustsec
 * [new ref]         3136ac1144a1e37afb5b393dae3d310cb2843365 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3136ac1 Update gix dependency to version 0.61