Combining 2 lists of strings with a separator

[jean-christophe manciot]

hello guys,

I need to build filenames based on 3 parts: basename, version and trailing '.x86_64.rpm'.

Let's focus on the first 2 parts:

The first one is:

        "installed_mtx_packages_name": [

            "mtx-device", 

            "mtx-grpc-agent", 

            "mtx-infra", 

...

        ]

The second one is:

        "installed_mtx_packages_version": [

            "1.0.0-r1705191346", 

            "1.0.1-r1705191346", 

            "1.0.0-r1705170158", 

...

        ]

the goal is to obtain this:

         "installed_mtx_packages_partialname": [

            "mtx-device-1.0.0-r1705191346", 

            "mtx-grpc-agent-1.0.0-r1705191346", 

            "mtx-infra-1.0.0-r1705170158", 

...

        ]

I've tried several strategies, including:

- name: Building partial name of installed MTX packages

  set_fact:

        installed_mtx_packages_partialname: "{{ installed_mtx_packages_name | map('regex_replace', '(.*)', '\\1-item') | list }}"

  with_items: installed_mtx_packages_version

But of course the item is considered as a string here instead of a variable.

If I move the ' just before item, I get the error:

"template error while templating string: expected token ',', got 'string' "

Any suggestion?

[Branko Majic]

On Wed, 27 Sep 2017 07:30:54 -0700 (PDT)
jean-christophe manciot <actionm...@gmail.com> wrote:

> hello guys,
> I need to build filenames based on 3 parts: basename, version and
> trailing '.x86_64.rpm'.
> Let's focus on the first 2 parts:
> The first one is:
> "installed_mtx_packages_name": [
> "mtx-device",
> "mtx-grpc-agent",
> "mtx-infra",
> ...
> ]
>
> The second one is:
> "installed_mtx_packages_version": [
> "1.0.0-r1705191346",
> "1.0.1-r1705191346",
> "1.0.0-r1705170158",
> ...
> ]
>
> the goal is to obtain this:
> "installed_mtx_packages_partialname": [
> "mtx-device-1.0.0-r1705191346",
> "mtx-grpc-agent-1.0.0-r1705191346",

Should this line be "mtx-grpc-agent-1.0.1-r1705191346" by any chance?
Just checking if the example might be a typo :)

> "mtx-infra-1.0.0-r1705170158",
> ...
> ]

This is not an answer for your question, but maybe a nudge to rethink
it if possible - do you absolutely have to form these as two separate
lists? Where do the installed_mtx_packages_name and
installed_mtx_packages_version variables come from? Command, some
external file?

Otherwise, you may want to look at this (if I understood your
requirements well):

https://docs.ansible.com/ansible/latest/playbooks_loops.html#looping-over-parallel-sets-of-data

> I've tried several strategies, including:
> - name: Building partial name of installed MTX packages
> set_fact:
> installed_mtx_packages_partialname:
> "{{ installed_mtx_packages_name | map('regex_replace', '(.*)',
> '\\1-item') | list }}" with_items: installed_mtx_packages_version
>
> But of course the item is considered as a string here instead of a
> variable.
>
> If I move the ' just before item, I get the error:
> "template error while templating string: expected token ',', got
> 'string' "

Not 100% sure what you mean by "just before item", but I'm assuming
you'd want (e.g. note the "'\\1-' + item" part - you can concatenate
strings this way):

"{{ installed_mtx_packages_name | map('regex_replace', '(.*)', '\\1-' + item) | list }}"

Additionally, you should switch to using (I think without moustaches
this would iterate over an item literal
"installed_mtx_packages_version" otherwise):

with_items: "{{ installed_mtx_packages_version }}"

To top it off - I'm pretty sure this particular loop would not produce
the list you desire.

Best regards

--
Branko Majic
XMPP: bra...@majic.rs
Please use only Free formats when sending attachments to me.

Бранко Мајић
XMPP: bra...@majic.rs
Молим вас да додатке шаљете искључиво у слободним форматима.

[jean-christophe manciot]

@branko 

- you're right about the typo.

- your "'\\1-' + item" solution works beautifully :-)

The solution hence is:

- name: Building partial name of installed MTX packages

  set_fact:

        installed_mtx_packages_partial_name: "{{ installed_mtx_packages_name | map('regex_replace', '(.*)', '\\1-' + item) | list }}"

  with_items: "{{ installed_mtx_packages_version }}"

The result is:

        "installed_mtx_packages_partial_name": [

            "mtx-device-1.0.1-r1705191346", 

            "mtx-grpc-agent-1.0.1-r1705191346", 

            "mtx-infra-1.0.1-r1705191346", 

...

        ]

Thanks!

[jean-christophe manciot]

@branko 

Sorry for the false positive, actually your solution does not work: it loops over all versions as expected, but it puts each item at the end of each name for each iteration, so the final list is (as shown in previous post):

        "installed_mtx_packages_partial_name": [

            "mtx-device-1.0.1-r1705191346", 

            "mtx-grpc-agent-1.0.1-r1705191346", 

            "mtx-infra-1.0.1-r1705191346", 

...

        ]

As you can see (and I missed it the first time), all the elements have the same version, instead of its own.

[jean-christophe manciot]

The true solution is tricky:

- name: Building partial name of installed MTX packages

  set_fact:

        installed_mtx_packages_partial_name_item: "{{ item.0 }}-{{ item.1 }}"

  with_together: 

        - "{{ installed_mtx_packages_name }}"

        - "{{ installed_mtx_packages_version }}"

  register: installed_mtx_packages_partial_name_result

- name: Building partial list of name of installed MTX packages

  set_fact: 

        installed_mtx_packages_partial_name: "{{ installed_mtx_packages_partial_name_result.results | map(attribute='ansible_facts.installed_mtx_packages_partial_name_item') | list }}"

leads to the true list:

        "installed_mtx_packages_partial_name": [

            "mtx-infra-1.0.0-r1705191346", 

            "mtx-device-1.0.0-r1705191346", 

            "mtx-grpc-agent-1.0.1-r1705191346", 

...

        ]

There might be a more elegant solution.