diff --git a/.gitignore b/.gitignore
index 3e03bfd..dbf1977 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-cache
+cosa
 ostree-repos
 
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..42df957
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+export COREOS_ASSEMBLER_CONTAINER=quay.io/coreos-assembler/coreos-assembler:v0.9.0
+
+function cosa() {
+  echo -e "\n>>> cosa" "$@" "\n"
+  podman run --rm -ti --security-opt label=disable --privileged --user root                        \
+             -v $PWD/cosa/:/srv/ --device /dev/kvm --device /dev/fuse                              \
+             --tmpfs /tmp -v /var/tmp:/var/tmp --name cosa -v ${PWD}:/git:ro                       \
+             ${COREOS_ASSEMBLER_CONTAINER_RUNTIME_ARGS} ${COREOS_ASSEMBLER_CONTAINER} "$@"
+}
+
+set -e
+if [ ! -e cosa ]; then
+  mkdir -p cosa
+  cosa init /git
+fi
+cosa fetch
+cosa build ostree
diff --git a/image.yaml b/image.yaml
new file mode 120000
index 0000000..da1a3d0
--- /dev/null
+++ b/image.yaml
@@ -0,0 +1 @@
+fedora-coreos-config/image.yaml
\ No newline at end of file