Make flashpointvm able to run in read-only mode.

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
         release_name: ${{ steps.prepare.outputs.sha_short }}
         draft: false
         prerelease: false
-    - name: Upload release
+    - name: Upload alpine.qcow2
       id: upload_release
       uses: actions/upload-release-asset@v1
       env:
@@ -43,3 +43,13 @@ jobs:
         asset_path: ./alpine.qcow2
         asset_name: alpine.qcow2
         asset_content_type: application/octet-stream
+    - name: Upload dummy.qcow2
+      id: upload_release
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ steps.create_release.outputs.upload_url }}
+        asset_path: ./dummy.qcow2
+        asset_name: dummy.qcow2
+        asset_content_type: application/octet-stream

snapshot.sh

@@ -1,7 +1,10 @@
 #!/bin/sh
+rm -f dummy.qcow2
+qemu-img create -f qcow2 dummy.qcow2 1M
 qemu-system-i386 $QEMU_EXTRA_ARGS -display none -m 128 \
 -net 'nic,model=virtio-net-pci' -net 'user,hostfwd=tcp::22500-:80' \
--monitor 'tcp:localhost:4445,server,nowait' -drive 'file=alpine.qcow2,if=virtio' &
+-monitor 'tcp:localhost:4445,server,nowait' -drive 'if=none,format=qcow2,file=dummy.qcow2' \
+-drive 'file=alpine.qcow2,if=virtio' &
 pid=$!
 
 while ! curl -sI 'http://127.0.0.1:22500/' >/dev/null; do
@@ -10,4 +13,5 @@ done
 
 echo 'apache is ready .. snapshot in 10 seconds' && sleep 10
 echo 'savevm quick' | nc -q1 -w5 127.0.0.1 4445 >/dev/null
-kill -TERM "$pid"
+sleep 2
+echo 'quit' | nc -q1 -w5 127.0.0.1 4445 >/dev/null