cloud-init cannot create swap files on paths that it mounts

This bug was originally filed in Launchpad as [LP: #1869114](https://bugs.launchpad.net/cloud-init/+bug/1869114)

Launchpad details

affected_projects = []

assignee = None

assignee_name = None

date_closed = None

date_created = 2020-03-26T01:03:00.287171+00:00

date_fix_committed = None

date_fix_released = None

id = 1869114

importance = wishlist

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1869114

milestone = None

owner = johnsonshi

owner_name = Johnson Shi

private = False

status = triaged

submitter = johnsonshi

submitter_name = Johnson Shi

tags = []

duplicates = []

_Launchpad user **Johnson Shi(johnsonshi)** wrote on 2020-03-26T01:03:00.287171+00:00_

1. cloud-init's swap module runs before the mount module, which causes swapfile creation on runtime mounted disks to fail.
2. cloud-init's swap create does not ensure it has a path to the file (if specified with a directory that does not exist yet).

Bug exists in all clouds, but the bug was discovered through deploying an Azure VM, mounting the Azure resource disk, and then creating a swapfile within the mounted resource disk.

Relevant logs: https://paste.ubuntu.com/p/QdGybC2wyc/