$ git clone -n https://src.fedoraproject.org/rpms/rust-ifcfg-devname.git /var/lib/mock/f40-build-1956674-25197/root/chroot_tmpdir/scmroot/rust-ifcfg-devname
Cloning into '/var/lib/mock/f40-build-1956674-25197/root/chroot_tmpdir/scmroot/rust-ifcfg-devname'...
$ git fetch origin 9018582f2e8112b84b89db968e2d5aee916d5e1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ifcfg-devname
 * [new ref]         9018582f2e8112b84b89db968e2d5aee916d5e1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9018582 update to new version