Each sub directory sets up at least one VM in GCE. If an instance wants to use the push/pulld system for deployment it needs to be based on the ‘skia-systemd-pushable-base’ snapshot that is derived from the pushable-systemd-snapshot GCE insance.
Important: The ‘pushable-systemd-pushable-base’ is based on an Ubuntu image and therefore automatic updating is enabled. git is also installed on skia-systemd-pushable-base by default. VM creation scripts that use this snapshot should not run:
$ apt-get upgrade -y
in their startup script or during VM creation.