$ git clone -n https://src.fedoraproject.org/rpms/ustreamer.git /var/lib/mock/f40-build-735114-106202/root/chroot_tmpdir/scmroot/ustreamer
Cloning into '/var/lib/mock/f40-build-735114-106202/root/chroot_tmpdir/scmroot/ustreamer'...
$ git fetch origin 699da7d915f57e3019e6d5cff9f31846583ae8c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ustreamer
 * [new ref]         699da7d915f57e3019e6d5cff9f31846583ae8c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 699da7d Update to 5.41, disable libgpio