aix: install rust

[abmusse]

Add rust, cargo, and rustfmt to the list of packages to install.

[richardlau]

It looks like on AIX, cargo/rustc are not installed into /opt/freeware/bin so are not on the PATH, e.g. https://ci.nodejs.org/job/node-test-commit-aix/61998/nodes=aix72-power9/console

It looks like they are in /opt/freeware/lib/RustSDK/1.88/bin. We either need to:

• Add this path to the PATH in the Jenkins start script:

  build/ansible/roles/jenkins-worker/templates/aix.rc2.j2

  Line 20 in 522b933

  export PATH="/opt/freeware/bin:/usr/opt/python3/bin/:$PATH"; \

• Add the path into select-compiler.sh for AIX.
• Export CARGO and RUSTC environment variables in select-compiler.sh for AIX with fully qualified paths to cargo/rustc.
• Create symlinks in /opt/freeware/bin to cargo/rustc (i.e. the symlinks would be on the PATH).

[sxa]

As I'm sure you'd agree, none of these options are good :'(

I guess that since the version is hardcoded to 1.88 we could legitimately use any of those. I might lean towards the symlinks (mostly to make any manual building/debugging on the machine easier) although I do wonder if there was a good reason the package maintainer decided to keep it isolated like this and not include a symlink.

[abmusse]

As I'm sure you'd agree, none of these options are good :'(

I guess that since the version is hardcoded to 1.88 we could legitimately use any of those. I might lean towards the symlinks (mostly to make any manual building/debugging on the machine easier) although I do wonder if there was a good reason the package maintainer decided to keep it isolated like this and not include a symlink.

I'm ok with creating the symlinks, just wondering where would best spot to do so in the playbooks? I guess I could do that in select-compiler.sh or the AIX Jenkins start script.

[richardlau]

As I'm sure you'd agree, none of these options are good :'(
I guess that since the version is hardcoded to 1.88 we could legitimately use any of those. I might lean towards the symlinks (mostly to make any manual building/debugging on the machine easier) although I do wonder if there was a good reason the package maintainer decided to keep it isolated like this and not include a symlink.

I'm ok with creating the symlinks, just wondering where would best spot to do so in the playbooks? I guess I could do that in select-compiler.sh or the AIX Jenkins start script.

Don't create symlinks in select-compiler.sh -- We only want to set env variables in there (e.g. setting PATH). If you opt for symlinks, create a new aix.yml in ansible/roles/baselayout/tasks/partials/postinstall which gets run after the package installs by

build/ansible/roles/baselayout/tasks/main.yml

Lines 114 to 122 in 601c84b

	- name: run os-specific steps after package install
	include_tasks: "{{ post_include }}"
	loop_control:
	loop_var: post_include
	with_first_found:
	- files:
	- "{{ role_path }}/tasks/partials/postinstall/{{ os }}.yml"
	- "{{ role_path }}/tasks/partials/postinstall/{{ os|stripversion }}.yml"
	skip: true

.