System user cannot be created with a homedir

This bug was originally filed in Launchpad as [LP: #1917135](https://bugs.launchpad.net/cloud-init/+bug/1917135)

Launchpad details

affected_projects = []

assignee = None

assignee_name = None

date_closed = None

date_created = 2021-02-27T12:58:59.498643+00:00

date_fix_committed = None

date_fix_released = None

id = 1917135

importance = undecided

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1917135

milestone = None

owner = jackenmen

owner_name = Jakub Kuczys

private = False

status = triaged

submitter = jackenmen

submitter_name = Jakub Kuczys

tags = []

duplicates = []

_Launchpad user **Jakub Kuczys(jackenmen)** wrote on 2021-02-27T12:58:59.498643+00:00_

While it is not typical, system users can be created with a home directory by passing `-m/--create-home` flag to the command along with `-r/--system` flag. This cannot be done currently as `system: true` option will forcefully add the `-M` flag to the command. I think that there should be some way to do this other than manually calling `useradd`. I was expecting that if I put `homedir: /home/homeassistant` explicitly in the cloud-config, it will work, but it is not enough:
```
#cloud-config
users:
- default
- name: homeassistant
gecos: Home Assistant
system: true
lock_passwd: true
homedir: /home/homeassistant
```