$ git clone -n https://src.fedoraproject.org/rpms/rust-num-traits.git /var/lib/mock/f40-build-2062956-49167/root/chroot_tmpdir/scmroot/rust-num-traits
Cloning into '/var/lib/mock/f40-build-2062956-49167/root/chroot_tmpdir/scmroot/rust-num-traits'...
$ git fetch origin 0c4fbb399e4d4a7db36abb19ce62aaf51699d139:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-traits
 * [new ref]         0c4fbb399e4d4a7db36abb19ce62aaf51699d139 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c4fbb3 Update to version 0.2.17; Fixes RHBZ#2242675