userdata: add tests for write_files in containers

Since we added support for write_files in cloud-init configuration for
containers - here is a test that will check that functionality,
including whether the cloud-init config is reapplied at the containers's
reboot

Signed-off-by: Paul Gaiduk <paulg@zededa.com>

tests/eclient/testdata/userdata.txt

@@ -3,11 +3,13 @@
 {{$port := "2223"}}
 
 {{$userdata_file := "/tmp/userdata_file_eden_test"}}
+{{define "ssh"}}ssh -o ConnectTimeout=10 -o StrictHostKeyChecking=no -i {{EdenConfig "eden.tests"}}/eclient/image/cert/id_rsa root@FWD_IP -p FWD_PORT{{end}}
 {{define "eclient_image"}}docker://{{EdenConfig "eden.eclient.image"}}:{{EdenConfig "eden.eclient.tag"}}{{end}}
 
 [!exec:bash] stop
 [!exec:sleep] stop
 [!exec:chmod] stop
+[!exec:ssh] stop
 
 exec -t 10s bash generate_file.sh
 
@@ -24,9 +26,28 @@ test eden.app.test -test.v -timewait 20m RUNNING eclient
 exec sleep 10
 
 eden pod delete eclient
-eden network delete n1
 
 test eden.app.test -test.v -timewait 10m - eclient
+
+exec -t 10s bash generate_userdata.sh
+eden pod deploy -n eclient --memory=512MB --networks=n1 {{template "eclient_image"}} -p {{$port}}:22 --metadata={{$userdata_file}}
+test eden.app.test -test.v -timewait 20m RUNNING eclient
+
+exec -t 2m bash test_injected_file.sh "before_restart"
+
+exec -t 2m bash change_injected_file.sh "after_restart"
+
+eden pod restart eclient
+test eden.app.test -test.v -timewait 20m RUNNING eclient
+
+exec -t 2m bash test_injected_file.sh "after_restart"
+
+eden pod delete eclient
+
+test eden.app.test -test.v -timewait 10m - eclient
+
+eden network delete n1
+
 test eden.network.test -test.v -timewait 10m - n1
 
 -- eden-config.yml --
@@ -43,3 +64,39 @@ test:
 # allocate about 90014 of raw data
 printf 'variable=value\n%.0s' {1..6000} >{{$userdata_file}}
 printf 'variable=value' >>{{$userdata_file}}
+
+-- generate_userdata.sh --
+cat > {{$userdata_file}} <<EOF
+#cloud-config
+write_files:
+ - path: /etc/injected_file.txt
+   owner: root:root
+   permissions: '0644'
+   encoding:
+   content: before_restart
+EOF
+
+-- test_injected_file.sh --
+EDEN={{EdenConfig "eden.root"}}/{{EdenConfig "eden.bin-dist"}}/{{EdenConfig "eden.eden-bin"}}
+TEXT=$1
+
+echo $EDEN sdn fwd eth0 {{$port}} -- {{template "ssh"}} grep -q $TEXT /etc/injected_file.txt
+
+# Retry in case there are connectivity issues
+for i in `seq 35`
+do
+  echo Try $i
+  $EDEN sdn fwd eth0 {{$port}} -- {{template "ssh"}} grep -q $TEXT /etc/injected_file.txt && echo "Success" && break
+  if [ $? -eq 1 ]; then
+    echo "$TEXT is not present in /etc/injected_file.txt"
+    exit 1
+  fi
+  sleep 2
+done
+
+-- change_injected_file.sh --
+EDEN={{EdenConfig "eden.root"}}/{{EdenConfig "eden.bin-dist"}}/{{EdenConfig "eden.eden-bin"}}
+TEXT=$1
+
+echo $EDEN sdn fwd eth0 {{$port}} -- {{template "ssh"}} "echo $TEXT > /etc/injected_file.txt"
+$EDEN sdn fwd eth0 {{$port}} -- {{template "ssh"}} "echo $TEXT > /etc/injected_file.txt"