Trying to duplicate a Bash script into ansible -- Not sure how to best handle alternatives with Slaves

[Justin Seiser]

I see there was a feature request for this, but they do not note how they actually worked around it. In a nutshell, we download a groovy archive, unzip it, and create slaves for every file in the archive that is not the groovy executable, and doesnt end with .bat. We then do a update-alternatives for groovy.

    GROOVY_ALT_SLAVES=""

    for f in $(ls /opt/groovy-${GROOVY_VERSION}/bin | fgrep -v .bat | grep -v '^groovy$'); do

        GROOVY_ALT_SLAVES=" ${GROOVY_ALT_SLAVES}  --slave /usr/bin/${f} ${f} /opt/groovy-${GROOVY_VERSION}/bin/${f}"

    done

    update-alternatives --install /usr/bin/groovy groovy /opt/groovy-${GROOVY_VERSION}/bin/groovy 2000 ${GROOVY_ALT_SLAVES}

    update-alternatives --set groovy /opt/groovy-${GROOVY_VERSION}/bin/groovy

I cant really wrap my head around the best way to dupe this, that isnt just running the shell module.  Once I resigned myself to using the shell module, I then read that doing something like

 - shell: GROOVY_ALT_SLAVES=" ${GROOVY_ALT_SLAVES}  --slave /usr/bin/{{ item }} {{ item }} /opt/groovy-{{ groovy_version }}/bin/{{ item }}"
    with_items: ['file1', 'file2']

Wouldn't work, since each shell run is a separate connection, so Im not really building up a long string to then append to the update-alternatives command.  There is also the fact I have to manually specify a list of items, since I cant use glob because i need to match files that do not match a certain set of expressions.

Im sure Im missing something obvious, but I haven't made any progress on this one and any help would be great.

[Toshio Kuratomi]

If you don't need idempotence (I assume you don't since the shell module doesn't have idempotence either) I'd use the script module with your existing bash script.

-toshio

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[Justin Seiser]

I would prefer to not use the shell module, thats why Im asking if anyone has any other way around it.

Thanks,

On Wednesday, 13 December 2017 20:27:16 UTC-5, Toshio Kuratomi wrote:

If you don't need idempotence (I assume you don't since the shell module doesn't have idempotence either) I'd use the script module with your existing bash script.

-toshio

On Dec 13, 2017 7:39 AM, "Justin Seiser" <justin...@gmail.com> wrote:

I see there was a feature request for this, but they do not note how they actually worked around it. In a nutshell, we download a groovy archive, unzip it, and create slaves for every file in the archive that is not the groovy executable, and doesnt end with .bat. We then do a update-alternatives for groovy.

    GROOVY_ALT_SLAVES=""

    for f in $(ls /opt/groovy-${GROOVY_VERSION}/bin | fgrep -v .bat | grep -v '^groovy$'); do

        GROOVY_ALT_SLAVES=" ${GROOVY_ALT_SLAVES}  --slave /usr/bin/${f} ${f} /opt/groovy-${GROOVY_VERSION}/bin/${f}"

    done

    update-alternatives --install /usr/bin/groovy groovy /opt/groovy-${GROOVY_VERSION}/bin/groovy 2000 ${GROOVY_ALT_SLAVES}

    update-alternatives --set groovy /opt/groovy-${GROOVY_VERSION}/bin/groovy

I cant really wrap my head around the best way to dupe this, that isnt just running the shell module.  Once I resigned myself to using the shell module, I then read that doing something like

 - shell: GROOVY_ALT_SLAVES=" ${GROOVY_ALT_SLAVES}  --slave /usr/bin/{{ item }} {{ item }} /opt/groovy-{{ groovy_version }}/bin/{{ item }}"
    with_items: ['file1', 'file2']

Wouldn't work, since each shell run is a separate connection, so Im not really building up a long string to then append to the update-alternatives command.  There is also the fact I have to manually specify a list of items, since I cant use glob because i need to match files that do not match a certain set of expressions.

Im sure Im missing something obvious, but I haven't made any progress on this one and any help would be great.

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[Kai Stian Olstad]

On Wednesday, 13 December 2017 16.39.30 CET Justin Seiser wrote:
> GROOVY_ALT_SLAVES=""
> for f in $(ls /opt/groovy-${GROOVY_VERSION}/bin | fgrep -v .bat | grep
> -v '^groovy$'); do
> GROOVY_ALT_SLAVES=" ${GROOVY_ALT_SLAVES} --slave /usr/bin/${f}
> ${f} /opt/groovy-${GROOVY_VERSION}/bin/${f}"
> done
>
> update-alternatives --install /usr/bin/groovy groovy
> /opt/groovy-${GROOVY_VERSION}/bin/groovy 2000 ${GROOVY_ALT_SLAVES}
> update-alternatives --set groovy
> /opt/groovy-${GROOVY_VERSION}/bin/groovy
>
> I cant really wrap my head around the best way to dupe this, that isnt just
> running the shell module. Once I resigned myself to using the shell
> module, I then read that doing something like
>
>
> - shell: GROOVY_ALT_SLAVES=" ${GROOVY_ALT_SLAVES} --slave /usr/bin/{{ item }} {{ item }} /opt/groovy-{{ groovy_version }}/bin/{{ item }}"
> with_items: ['file1', 'file2']
>
>
>
>
> Wouldn't work, since each shell run is a separate connection, so Im not
> really building up a long string to then append to the update-alternatives
> command. There is also the fact I have to manually specify a list of
> items, since I cant use glob because i need to match files that do not
> match a certain set of expressions.
>
>
> Im sure Im missing something obvious, but I haven't made any progress on
> this one and any help would be great.

You could do something like this, not tested so it might have some syntax and logical errors.

- shell: ls /opt/groovy-${GROOVY_VERSION}/bin | fgrep -v .bat | grep -v '^groovy$'
register: r

- set_fact:
GROOVY_ALT_SLAVES: '{% for item in r.stdout_lines %} --slave /usr/bin/{{ item }} {{ item }} /opt/groovy-{{ groovy_version }}/bin/{{ item }} {%- endfor %}'

- command: update-alternatives --install /usr/bin/groovy groovy /opt/groovy-{{ groovy_version }}/bin/groovy 2000 {{ GROOVY_ALT_SLAVES }}

- command: update-alternatives --set groovy /opt/groovy-{{ groovy_version }/bin/groovy


--
Kai Stian Olstad