Add option to run command(s) at container startup

[FFY00]

It would be great if we had a way to run a command at container startup. This could be used to for example update the system and install python, giving a workaround to #49.

[TomasTomecek]

Does raw module help with this?

[FFY00]

No, because we need to run the command before checking if python is installed on the container.

[FFY00]

Friendly ping

Right now I am not able to create containers based on https://hub.docker.com/_/archlinux/ because it does not contain python. I would have to maintain a separate container for this, which is not great.

[TomasTomecek]

Friendly ping

Right now I am not able to create containers based on https://hub.docker.com/_/archlinux/ because it does not contain python. I would have to maintain a separate container for this, which is not great.

Hey, sadly I don't have time to work on bender lately, as you can clearly see. If you need this feature, you'd need to implement it yourself.

[FFY00]

Yes, I would be happy to look into it if you gave me some pointers.

[TomasTomecek]

So no code changes are really needed, I figured it out:

$ cat p.yaml
---
- hosts: all
  gather_facts: false
  tasks:
  - raw: pacman -Sy --noconfirm python3
  - command: python3 --version

gather_facts: false is important so that ansible won't try checking for python

you also need to tell bender where the python interpreter will be:

$ ansible-bender build --python-interpreter /usr/bin/python3.8 ./p.yaml archlinux asd

PLAY [asd-20200420-093410492979-cont] ********************************************************************************

TASK [raw] ***********************************************************************************************************
changed: [asd-20200420-093410492979-cont]

TASK [command] *******************************************************************************************************
changed: [asd-20200420-093410492979-cont]

PLAY RECAP ***********************************************************************************************************
asd-20200420-093410492979-cont : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Getting image source signatures
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Copying blob sha256:2bd7c539eb799cc13d2700e6a8581e64dd46a3f25c27d5150ef9b89a7ecee5c7
Copying config sha256:d5eb846a7f8de68107acdcf0e9b0ea497911ecffbae4e5a8341c2f2cbbc58f59
Writing manifest to image destination
Storing signatures
d5eb846a7f8de68107acdcf0e9b0ea497911ecffbae4e5a8341c2f2cbbc58f59
Image 'asd' was built successfully \o/

[FFY00]

Oh, great! Thanks.

By the way, partial upgrades in Arch Linux are not supported, so you should do pacman -Sy --noconfirm python3 😄.

[TomasTomecek]

By the way, partial upgrades in Arch Linux are not supported, so you should do pacman -Sy --noconfirm python3 smile.

This was the first time I was using arch. Also can't see any difference between the command in my example.

[FFY00]

Sorry, typo.

pacman -Syu --noconfirm python