$ git clone -n https://src.fedoraproject.org/rpms/qgis.git /var/lib/mock/f40-build-735001-106150/root/chroot_tmpdir/scmroot/qgis
Cloning into '/var/lib/mock/f40-build-735001-106150/root/chroot_tmpdir/scmroot/qgis'...
$ git fetch origin 2265ed83bf6f816c52509210150e0d6471334ab1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qgis
 * [new ref]         2265ed83bf6f816c52509210150e0d6471334ab1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2265ed8 Rebuild (grass)