$ git clone -n https://src.fedoraproject.org/rpms/gutenprint.git /var/lib/mock/f40-build-2236787-53519/root/chroot_tmpdir/scmroot/gutenprint
Cloning into '/var/lib/mock/f40-build-2236787-53519/root/chroot_tmpdir/scmroot/gutenprint'...
$ git fetch origin a41e562922bd6c7d6fb7893251bce41802d8cd3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gutenprint
 * [new ref]         a41e562922bd6c7d6fb7893251bce41802d8cd3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a41e562 Backport upstream patch to fix C compatibility issue