Re: [RFC PATCH] fstests: Request inferred user

[Frederick Lawler <fred@cloudflare.com>]

On Thu, Aug 31, 2023 at 06:13:23AM -0400, Jeff Layton wrote:
> On Wed, 2023-08-30 at 18:53 -0500, Frederick Lawler wrote:
> > Currently when running make fstests for bare-metal setups, the data_user
> > 'vagrant' is set for the /data partition. This is currently set as the default
> > data_user. We have the option to edit this in extra_vars.yml.
> > 
> > make linux checks for an inferred user prior to setting the uid/gid for
> > the /data partition.
> > 
> > In the situation where we don't add the 'vagrant' user to the
> > bare-metal, we get a "user does not exist" on make fstests.
> > 
> > In both cases we do not want to switch users between the two targets,
> > nor do we want to necessarily ensure that the 'vagrant' user exists on
> > the metal. Therefore, request the inferred user on make fstests.
> > 
> > Signed-off-by: Frederick Lawler <fred@cloudflare.com>
> > ---
> > Since this is essentially in two places, I figure this should be more
> > generic and then included in other make targets like cxl. But this is to
> > get the discussion going if this or some other generic approach is
> > preferred.
> > ---
> >  playbooks/roles/fstests/tasks/main.yml | 37 ++++++++++++++++++++++++++
> >  1 file changed, 37 insertions(+)
> > 
> > diff --git a/playbooks/roles/fstests/tasks/main.yml b/playbooks/roles/fstests/tasks/main.yml
> > index e2d7ce5295b7..2898833b0732 100644
> > --- a/playbooks/roles/fstests/tasks/main.yml
> > +++ b/playbooks/roles/fstests/tasks/main.yml
> > @@ -10,6 +10,43 @@
> >        skip: true
> >    tags: vars
> >  
> > +- name: Get username we are using
> > +  command:
> > +    cmd: whoami
> > +  register: username_on_target
> > +  when:
> > +    - infer_uid_and_group|bool
> > +
> > +- name: Set target user as a fact
> > +  set_fact:
> > +    target_user: "{{ username_on_target.stdout }}"
> > +  when:
> > +    - infer_uid_and_group|bool
> > +
> > +- name: Run getent against the inferred target user
> > +  getent:
> > +    database: passwd
> > +    key: "{{ target_user }}"
> > +  register: getent_running_user
> > +  when:
> > +    - infer_uid_and_group|bool
> > +
> > +- name: Run getent against the inferred target group
> > +  getent:
> > +    database: group
> > +    key: "{{ target_user }}"
> > +  register: getent_on_group
> > +  when:
> > +    - infer_uid_and_group|bool
> > +
> > +- name: Override user and group with inferred settings if feature is enabled
> > +  set_fact:
> > +    user: "hplip"
> 
> Why "hplip" here?

This was mostly copy/pasted from
./playbooks/roles/bootlinux/tasks/main.yml. I see it was introduced in commit
f10add06446b ("kdevops: remove ansible galaxy dependency") for that file,
but I'm unclear the use there. I'd like to know as well.

> 
> > +    data_user: "{{ target_user }}"
> > +    data_group: "{{ ((getent_on_group.values() | first).values() | first).keys() | first }}"
> > +  when:
> > +    - infer_uid_and_group|bool
> > +
> >  - include_role:
> >      name: create_data_partition
> >    tags: [ 'oscheck', 'data_partition' ]
> 
> -- 
> Jeff Layton <jlayton@kernel.org>

Fred