perlbrew uses ~/.cpanm/ - why's that then?

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

Hello Wise Ones,

I've installed perlbrew and installing some modules using cpanm (after doing : perlbrew install-cpanm) - then when I install a module from cpanm is moans about permission denied in ~/.cpanm/...

Fine, I've obvs used root for cpanm before, but why does perlbrew use anything outside it's own domain? I thought that was the point.

I can reset the permissions of ~/.cpanm/... to be me, but that seems a sledgehammer solution and poss not what non-perlbrew requires (if I use system perl to install, with sudo, then I'll get the same errors when using perlbrew later).

Cheers for any ideas,

Caesura

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Re: perlbrew uses ~/.cpanm/ - why's that then? by Dallaylaen (Chaplain) on Nov 23, 2016 at 20:34 UTC
A reasonable question. However, I'm not sure how hard it would be to patch cpanm so that it uses a custom working directory. And it would require thorough testing on many systems, while running cpanm as root is probably not so common. Cpanm is for not having to run it as root after all!	[reply]
Re^2: perlbrew uses ~/.cpanm/ - why's that then? by Anonymous Monk on Nov 23, 2016 at 21:36 UTC
cpanm is for installing modules, where/how.... is all configurable, just like cpan and cpanp ....	[reply]
Re^2: perlbrew uses ~/.cpanm/ - why's that then? by Caesura (Sexton) on Nov 24, 2016 at 10:44 UTC
Thanks for your replies and yes, I could make it open to root and me, but I think I'd want a different collection of modules for each version of Perl in cpan (some new modules won't work on older Perls), so how would I patch cpanm to be different for all the Perls available in perlbrew? A bit of a faff when I thought perlbrew had self-contained environments. I'll look into it more...! Cheers, Caesura	[reply]
Re^3: perlbrew uses ~/.cpanm/ - why's that then? by Dallaylaen (Chaplain) on Nov 24, 2016 at 14:59 UTC
Honestly, I have no idea why perlbrew team decided to not patch cpanm in the way you describe. Maybe it was hard enough to patch it to work with perlbrew at all (mind you, the default cpanm doesn't).	[reply]
Re: perlbrew uses ~/.cpanm/ - why's that then? by Anonymous Monk on Nov 23, 2016 at 21:40 UTC
How do you know its perlbrew?	[reply]
Re^2: perlbrew uses ~/.cpanm/ - why's that then? by Caesura (Sexton) on Nov 24, 2016 at 10:49 UTC
I called cpanm when using perlbrew, it was using `/home/caesura/perl5/perlbrew/bin/cpanm` and was trying to move stuff about in `./cpanm/`. So, yes, deffo perlbrew I think! Cheers, Caesura	[reply] [d/l] [select]
Re^3: perlbrew uses ~/.cpanm/ - why's that then? by Anonymous Monk on Nov 25, 2016 at 22:47 UTC
What does `perl -V` output?	[reply] [d/l]
Re^3: perlbrew uses ~/.cpanm/ - why's that then? by Anonymous Monk on Nov 25, 2016 at 22:55 UTC
So it was using /home/caesura/.cpanm ? Why is this a problem?	[reply]

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