$ git clone -n https://src.fedoraproject.org/rpms/rust-ipnet.git /var/lib/mock/f45-build-42637-795/root/chroot_tmpdir/scmroot/rust-ipnet
Cloning into '/var/lib/mock/f45-build-42637-795/root/chroot_tmpdir/scmroot/rust-ipnet'...
$ git fetch origin 0220ad44d52b0ecd2dbe2a96a265eeef8ba8aafc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ipnet
 * [new ref]         0220ad44d52b0ecd2dbe2a96a265eeef8ba8aafc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0220ad4 Update to version 2.12.2; Fixes RHBZ#2529135