$ git clone -n https://src.fedoraproject.org/rpms/fvwm.git /var/lib/mock/f40-build-2235697-53459/root/chroot_tmpdir/scmroot/fvwm
Cloning into '/var/lib/mock/f40-build-2235697-53459/root/chroot_tmpdir/scmroot/fvwm'...
$ git fetch origin 85178bd7cf972c5ccce8dabcd8859e359e44e604:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fvwm
 * [new ref]         85178bd7cf972c5ccce8dabcd8859e359e44e604 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85178bd Further C compatibility fixes for the configure script