Randomly-set credentials not available within the instance

This bug was originally filed in Launchpad as [LP: #1921124](https://bugs.launchpad.net/cloud-init/+bug/1921124)

Launchpad details

affected_projects = []

assignee = oddbloke

assignee_name = Dan Watkins

date_closed = None

date_created = 2021-03-24T14:11:48.686652+00:00

date_fix_committed = None

date_fix_released = None

id = 1921124

importance = undecided

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1921124

milestone = None

owner = oddbloke

owner_name = Dan Watkins

private = False

status = in_progress

submitter = oddbloke

submitter_name = Dan Watkins

tags = []

duplicates = []

_Launchpad user **Dan Watkins(oddbloke)** wrote on 2021-03-24T14:11:48.686652+00:00_

As part of the fix for bug 1918303 in [0], we stopped emitting randomly-generated passwords to /var/log/cloud-init-output.log. This functionality _is_ used by some cloud-init consumers, most notably subiquity.

We should reintroduce saving these passwords somewhere in the instance, securely, so that these use cases are not regressed.

[0] https://github.com/canonical/cloud-init/commit/b794d426b9ab43ea9d6371477466070d86e10668