Hi Tanguy,
It looks like you are on the right track, but you may just need to fix the PATH
environment variable and add (default-environment-variables) back in to start
function like so:
```
#:environment-variables (append (list (string-append "PYTHONPATH="
#$(file-append gertrude (string-append "/lib/python" (version-major+minor
(package-version python)) "/site-packages/")))
(string-append "DSN=" #$data-source-name)
"PATH=/run/setuid-programs:/run/current-system/profile/bin:/run/current-system/profile/sbin")
(default-environment-variables))
```
Note that the default PATH environment variable is pretty unusable within
Shepherd services, so you'll need to set it explicitly as above if your
services need to find another package in the environment.
Happy hacking!
Gary
"Tanguy Le Carrour" <[email protected]> writes:
> Hi Guix,
>
> I have a bunch of web services, written in Python using Flask, and I would
> love to run them as Guix services, but I cannot figure out how to make that
> work!?
> The only example I could put my hands on is `patchwork-service-type`, but it’s
> different for it provides its own script to run the web server,
> `patchwork-admin`.
>
> My web services follow the WSGI specification and can be run using different
> servers (`uwsgi`, `gunicorn`…) so, to me, it’s up to the person starting
> the service, and writing the service definition, to pick one and run it.
>
> I’ve tried several different approaches, but always end up with something
> broken.
> With my last attempt (below) the service runs, but cannot find `Flask` which
> is a `propagated-inputs` of the `gertrude` package.
>
> ```scheme
> (define (gertrude-shepherd-service config)
> (match-record config <gertrude-configuration>
> (address port workers data-source-name user group log-file)
> (list
> (shepherd-service
> (documentation "Run a @code{gertrude} instance.")
> (provision '(gertrude))
> (requirement '(networking))
> (start #~(make-forkexec-constructor
> (list
> (string-append #$gunicorn "/bin/gunicorn")
> (string-append "--access-logfile=-")
> (string-append "--workers=" (number->string #$workers))
> (string-append "--bind=" #$address ":" (number->string
> #$port))
> "gertrude.configuration:wsgi()")
> #:user #$user
> #:group #$group
> #:log-file #$log-file
> #:environment-variables (list
> (string-append "PYTHONPATH=" #$(file-append gertrude
> (string-append
> "/lib/python"
> (version-major+minor
> (package-version python))
> "/site-packages/")))
> (string-append "DSN=" #$data-source-name))))
> (stop #~(make-kill-destructor))))))
> ```
>
> The only way I’ve found to make `gunicorn` "see" `gertrude` is by modifying
> the `PYTHONPATH`. This works, but it doesn’t see the package
> `propagated-inputs`.
> I don’t feel like adding all the package dependencies to the `PYTHONPATH`
> is the proper way to solve the problem, right?
>
> Am I missing something obvious?!
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