$ git clone -n https://src.fedoraproject.org/rpms/kf5-knewstuff.git /var/lib/mock/f39-build-2178697-51118/root/chroot_tmpdir/scmroot/kf5-knewstuff
Cloning into '/var/lib/mock/f39-build-2178697-51118/root/chroot_tmpdir/scmroot/kf5-knewstuff'...
$ git fetch origin 8cc3282976b55ddcbefe35b6a027a44a4f5a8695:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-knewstuff
 * [new ref]         8cc3282976b55ddcbefe35b6a027a44a4f5a8695 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cc3282 5.113.0