$ git clone -n https://src.fedoraproject.org/rpms/rust-ipnet.git /var/lib/mock/f39-build-1521842-35863/root/chroot_tmpdir/scmroot/rust-ipnet
Cloning into '/var/lib/mock/f39-build-1521842-35863/root/chroot_tmpdir/scmroot/rust-ipnet'...
$ git fetch origin f4d0c47f68c43ba6266123f750cccfc931231ca6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ipnet
 * [new ref]         f4d0c47f68c43ba6266123f750cccfc931231ca6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4d0c47 Update to version 2.9.0; Fixes RHBZ#2245548