Date: Tue, 3 Jan 2017 22:39:25 +0100 From: =?iso-8859-1?Q?Jos=E9_G=2E?= Juanino <jjuanino@gmail.com> To: Steve Wills <swills@FreeBSD.org> Cc: freebsd-ruby@freebsd.org Subject: Re: PREFIX enviroment variable pollutes gem search path Message-ID: <20170103213925.dwghtjmnp5k4qu6n@abel.home.inet> In-Reply-To: <e337a1dc-b541-ae80-e74e-8f34437e830d@FreeBSD.org> References: <20170103000758.pnoglvxtseec2xpn@abel.home.inet> <20170103142749.62nzduottim5wxpj@abel.home.inet> <5a2c04e1-81bb-41f6-e727-9b4a53682d9b@FreeBSD.org> <20170103192259.c6ebqxy3jwrsgo5o@abel.home.inet> <e337a1dc-b541-ae80-e74e-8f34437e830d@FreeBSD.org>
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El martes 03 de enero a las 20:53:18 CET, Steve Wills escribi=F3:
>
>> But if you run
>> *any* ruby dependent port polluted with PREFIX environment variable, and
>> that port requires some other gem, it will fails at the moment it
>> 'requires' the gem, sure.
>
>Describing it as "polluted" with a PREFIX environment variable seems a
>bit inaccurate to me. PREFIX is a commonly used variable on FreeBSD and
>in this case it's mean to indicate to gem where it might find some
>things. I'm guessing your custom code checks for this variable as well
>and also is meant to use it for something else? Perhaps it could be
>change to use a different variable name?
Hello Steve, thanks for time and patience.
The problem is that if your custom ruby program uses the PREFIX=20
environment variable to achieve some other purpose, you must be aware=20
that your code will use the assigned value to load the required gems,=20
and this is unexpected and will cause a lot of trouble (this reason lead=20
to me to say that PREFIX environment variable polluted the search gem=20
path).
A contrived example could be, assuming you have installed=20
devel/rubygem-test-unit:
$ echo "require 'test/unit'" > prefix_test.rb
$ /usr/local/bin/ruby22 prefix_test.rb
$ echo $?
0
$ PREFIX=3D"some_prefix" /usr/local/bin/ruby22 prefix_test.rb
/usr/local/lib/ruby/site_ruby/2.2/rubygems/core_ext/kernel_require.rb:55:in=
=20
`require': cannot load such file -- test/unit (LoadError)
from /usr/local/lib/ruby/site_ruby/2.2/rubygems/core_ext/kernel_req=
uire.rb:55:in `require'
from prefix_test.rb:1:in `<main>'
$ echo $?
1
The error raises because ruby try to find the gem specifications=20
directory in the following nonexistent path:=20
some_prefix/lib/ruby/gems/2.2/specifications
instead of:
/usr/local/lib/ruby/gems/2.2/gems/specifications
You can check this assertion by running a truss in the failed code, and=20
comparing it with the right one.
Excuse my poor english, sorry for the misunderstoods.
--=20
Jos=E9 G. Juanino
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