Implement a prereqCmd option for installing system deps

[dschep]

closes #101

Test this out and let me know if it fulfills your requirements @AndrewFarley

(install with npm i UnitedIncome/serverless-python-requirements@prereq-script)

[dschep]

However! Another approach I have considered in the past is building a serverless plugin just for installing system dependencies. Thoughts on that approach? (you'd just add serverless-aws-system-deps to your plugins and add an option under custom like: deps: [mysql-dev]. The only issue was that I wasn't sure what to grab or where to copy things after the system package is installed.

[AndrewFarley]

@dschep Glanced at the files changed, looks great. Will try it out this evening and let you know. Cheers!

[AndrewFarley]

Hey @dschep a quick check of this and it doesn't seem to run prereqCmd at all for me.

  pythonRequirements:
    dockerizePip: true
    invalidateCaches: false
    prereqCmd: bash -c "yum install mysql-devel && cp /usr/lib64/mysql/libmysqlclient.so.18.0.0 ./libmysqlclient.so.18"
    #    prereqCmd: ./install-mysql-client.sh

I tried both ways, inline shell and included file. I dropped some debug echoes into the prereqCmd.js and that function never gets executed. Am I missing something?

[dschep]

Hmm.. When you did an included file, how did you specify the name/path? In my test I used ./foobar (a relative path). I think that it has to be a path that node's child_process.Spawn can excecute. I'll add the shell option which might make the bash command work. I'll add a test for that too.

[AndrewFarley]

Well... the prereq command isn't even running at all for me, as I said I threw some quick debug console logs in there to show it. A good example to test against, it making sure that requirements.txt has "mysqlclient" in it, and that pip package compiles properly. Might want to add that to your test to be sure it works.

[dschep]

did you try again with the new commits?

[AndrewFarley]

Yeah, still no go. I don't know if it's because I'm on OS-X, or perhaps using it dockerized?

[dschep]

mmm yeah, i'll have to test it dockerized.

[AndrewFarley]

Yeah, sorry @dschep the whole point of this was for use while in dockerized pip mode. Otherwise, I would/could have just done some simple wrapper to install and some local system libraries. :) Hoping this can still happen one day soon though.

[Arsen00]

open

[Arsen00]

+### Run Custom extra packaging scripts

[dschep]

@Arsen00, What?