does a script run via plackup knows where it is?

morgon has asked for the wisdom of the Perl Monks concerning the following question:

I have a script that I run via plackup and want to run it on different machines with the different directory-layouts.

The script accesses some other resources can be found relative to the script-location.

I'd like to be able to simply move the script around and wonder if there is a way for the running script to find it's location.

Or to clarify: Is there a way for a script that is run via "plackup /path/to/somewhere/myscript.psgi" to figure out /path/to/somewhere at runtime in a handler?

Many thanks!

Comment on does a script run via plackup knows where it is?

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Re: does a script run via plackup knows where it is? by Your Mother (Archbishop) on May 14, 2018 at 16:21 UTC
Maybe, probably– `# app.psgi, cp or mv it around and plackitup. :P use Path::Tiny; my $location = path(__FILE__)->absolute; sub { [ 200, [], ["OHAI $location!"] ] }` [download] Update: I actually think a command line argument or `plackup` wrapper might be a better choice here. Multiple copies of code is code smell.	[reply] [d/l] [select]
Re^2: does a script run via plackup knows where it is? by morgon (Priest) on May 14, 2018 at 16:33 UTC
Yep, thanks a lot. The only thing you need watch out for is that your above $location is actually an object and when you return that from a Dancer2 handler it confuses Dancer greatly. But it solves my my need in an already bad-smelling hack, so never mind code-smell...	[reply]
Re^3: does a script run via plackup knows where it is? by Your Mother (Archbishop) on May 14, 2018 at 16:59 UTC
That's partly why I quoted it in the example. It stringifies the object. You can, as you probably already found, do `$location->stringify` too.	[reply] [d/l]
Re: does a script run via plackup knows where it is? by dsheroh (Monsignor) on May 15, 2018 at 07:24 UTC
Doesn't FindBin work normally with `plackup`? I'm not able to easily test this at the moment, but the PSGI/Plack example in CGI::Alternatives uses FindBin in the code and `plackup` for its start command, which seems like a pretty strong indication that they should play nice together.	[reply] [d/l] [select]