$ git clone -n https://src.fedoraproject.org/rpms/gvfs.git /var/lib/mock/f40-build-2003603-44858/root/chroot_tmpdir/scmroot/gvfs
Cloning into '/var/lib/mock/f40-build-2003603-44858/root/chroot_tmpdir/scmroot/gvfs'...
$ git fetch origin 5c04fc23ecb60b31569eae612c7b3a8ee0f281c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gvfs
 * [new ref]         5c04fc23ecb60b31569eae612c7b3a8ee0f281c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c04fc2 Update to 1.52.1