$ git clone -n https://src.fedoraproject.org/rpms/gnome-screenshot.git /var/lib/mock/f41-build-side-1-2637953-26364/root/chroot_tmpdir/scmroot/gnome-screenshot
Cloning into '/var/lib/mock/f41-build-side-1-2637953-26364/root/chroot_tmpdir/scmroot/gnome-screenshot'...
$ git fetch origin c53ea96804b2d1a0ed93b1c6bdc42e1f193da318:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-screenshot
 * [new ref]         c53ea96804b2d1a0ed93b1c6bdc42e1f193da318 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c53ea96 convert GPLv2+ license to SPDX