$ git clone -n https://src.fedoraproject.org/rpms/skanpage.git /var/lib/mock/f40-build-2326503-58834/root/chroot_tmpdir/scmroot/skanpage
Cloning into '/var/lib/mock/f40-build-2326503-58834/root/chroot_tmpdir/scmroot/skanpage'...
$ git fetch origin 164b04b52f1bd8c19b24660ad318d42949096882:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/skanpage
 * [new ref]         164b04b52f1bd8c19b24660ad318d42949096882 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 164b04b Rebuild (tesseract)