perlbrew and cpan

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

Replies are listed 'Best First'.
Re: perlbrew and cpan by CountZero (Bishop) on Aug 07, 2014 at 06:33 UTC
Yes, you can use CPAN inside a perlbrew context. You can run CPAN under `sudo` but that is probably a bad idea. I think you will mess up your system's Perl that way. Runing CPAN (which is actually just another Perl script) without `sudo` will keep your install within the Perl instance you are running under at that moment. That's actually the whole idea of using perlbrew. CountZero A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James My blog: Imperial Deltronics	[reply] [d/l] [select]
Re^2: perlbrew and cpan by Anonymous Monk on Aug 07, 2014 at 08:40 UTC
Thx. So it looks like I may have messed up my cpan and my system perl. And there is no good way to fix it except to restore from backup? lc	[reply]
Re^3: perlbrew and cpan by ikegami (Patriarch) on Aug 07, 2014 at 16:43 UTC
You can fix the file ownership as follows: `sudo chown -R $USER "${PERLBREW_ROOT:-$HOME/perl5/perlbrew}"` [download] The following fixes the group too, assuming the group name should be the same as your user name: `sudo chown -R $USER:$USER "${PERLBREW_ROOT:-$HOME/perl5/perlbrew}"` [download] You didn't say how you messed up your system `perl`, so I can't offer any advice on how to fix it.	[reply] [d/l] [select]
Re^3: perlbrew and cpan by Anonymous Monk on Aug 07, 2014 at 08:44 UTC
So it looks like I may have messed up my cpan and my system perl. And there is no good way to fix it except to restore from backup? Why does it look that way to you?	[reply]
Re^4: perlbrew and cpan by Anonymous Monk on Aug 07, 2014 at 09:03 UTC
Re^5: perlbrew and cpan by ikegami (Patriarch) on Aug 07, 2014 at 14:02 UTC
Re^5: perlbrew and cpan by Anonymous Monk on Aug 07, 2014 at 09:45 UTC
Some notes below your chosen depth have not been shown here
Re: perlbrew and cpan by DrHyde (Prior) on Aug 07, 2014 at 09:52 UTC
I'll answer your first two questions with a couple of questions: what happens when you try it? and re sudo what happens when you try without it? As for your third, it depends on whether you want to install into the currently selected perl or some random perl. You can do both, but the second is slightly more complicated.	[reply]
Re: perlbrew and cpan by ikegami (Patriarch) on Aug 07, 2014 at 14:23 UTC
Can I use cpan inside a perlbrew context -- to install perl modules to a particular perlbrew perl install, only. Yes. `perlbrew use NAME cpan MODULE` [download] or `"${PERLBREW_ROOT:-$HOME/perl5/perlbrew}/perls/NAME/bin/cpan" MODULE` [download] (Replace NAME with the name of the perlbrew installation you want to use, and MODULE with the name of the module you want to install.) Do I prefix the cpan install command with sudo? As in sudo perl -MCPAN -e'install Blah::blah'? Not likely. The default settings for `perlbrew` places the Perl installations in your own home directory. It's unlikely that someone else installed a Perl there, so it wouldn't make sense to pretend to be someone else. Can I actually use cpan to install modules in a particular perlbrew perl install only? Is that syntax without the sudo? Seems you asked the same question twice?	[reply] [d/l] [select]
Re: perlbrew and cpan by Anonymous Monk on Aug 07, 2014 at 06:40 UTC
Can I use cpan inside a perlbrew context -- to install perl modules to a particular perlbrew perl install, only. Yes, at least theoretically -- I've seen a few questions about perlbrew from folks who don't know to `which programname` to debug issues they encounter Do I prefix the cpan install command with sudo? As in sudo perl -MCPAN -e'install Blah::blah'? Are you root/sysadmin? sudo is for when a sysadmin is installing programs/perls/perl modules for everybody ... for day-to-day activities sysadmins don't login under the sysadmin account (root), so they sudo to do sysadmin tasks ... perlbrew is all about you installing perls/modules in your home directory for yourself sure its possible to shared perlbrew running as root, but then you wouldn't be asking these questions if this was the case :) Can I actually use cpan to install modules in a particular perlbrew perl install only? Is that syntax without the sudo? Yes, use perlbrew to switch current perl, then run cpan as normal (cpan Module::Name) and you'll install modules in the current perl I'm on win32 so I don't perlbrew, but I'd look for a perlintro equivalent for perlbrew :)	[reply]
Re^2: perlbrew and cpan (perlbrewintro) by Anonymous Monk on Aug 07, 2014 at 07:33 UTC
perlintro for perlbrew is App::perlbrew - Manage perl installations in your $HOME shorter intro Install it in $HOME `curl -kL http://install.perlbrew.pl \| bash` Install important friend `perlbrew install-cpanm` Install the perls you want, like the latest of each minor stable version `perlbrew install-multiple perl-5.8.9 perl-5.10.1 perl-5.12.5 perl-5.14.4 perl-5.16.3 perl-5.18.2 perl-5.20.0` Install modules you want into all perlbrew perls in one command (aka run one command for all perlbrew perls) `perlbrew exec cpanm Path::Tiny Mojolicious Task::Kensho` Switch to perl-5.16.3 and make perl-5.16.3 your default perl (perl ... runs perl-5.16.3 ) `perlbrew switch perl-5.16.3` Synchronize all installed perls modules (aka run one command for all perlbrew perls) `perlbrew list-modules \| perlbrew exec cpanm`	[reply]
Re^2: perlbrew and cpan by Anonymous Monk on Aug 07, 2014 at 08:54 UTC
Thx for your reply? The reason I am getting confused about sudo and the cpan command is because I have never worked with non-system perl such as what perlbrew makes possible It's not obvious to me that there is a cpan for each perlbrew install. I cannot figure out how and where cpan will install the modules in an environment when there are multiple perls installed. I actually have been googling all over the place in search for the answer. Seems like that added to my confusion. Thx	[reply]
Re^3: perlbrew and cpan by ikegami (Patriarch) on Aug 07, 2014 at 16:49 UTC
I have never worked with non-system perl such as what perlbrew makes possible There's no difference between a distro-installed Perl and a perlbrew-installed Perl except in which directory they are installed. In fact, you can manage the system Perl with perlbrew simply by creating a symlink. `cd "${PERLBREW_ROOT:-$HOME/perl5/perlbrew}" mkdir perls/system ln -s /usr/bin perls/system/bin` [download] It's not obvious to me that there is a cpan for each perlbrew install. Each perlbrew has its own modules and binaries. I cannot figure out how and where cpan will install the modules in an environment when there are multiple perls installed. `cpan` asks the `perl` executing it for that information. $ "${PERLBREW_ROOT:-$HOME/perl5/perlbrew}"/perls/5.20.0t/bin/perl -V:' +inst.' installarchlib='/home/ikegami/usr/perlbrew/perls/5.20.0t/lib/5.20.0/x8 +6_64-linux-thread-multi'; installbin='/home/ikegami/usr/perlbrew/perls/5.20.0t/bin'; installhtml1dir=''; installhtml3dir=''; installman1dir='/home/ikegami/usr/perlbrew/perls/5.20.0t/man/man1'; installman3dir='/home/ikegami/usr/perlbrew/perls/5.20.0t/man/man3'; installprefix='/home/ikegami/usr/perlbrew/perls/5.20.0t'; installprefixexp='/home/ikegami/usr/perlbrew/perls/5.20.0t'; installprivlib='/home/ikegami/usr/perlbrew/perls/5.20.0t/lib/5.20.0'; installscript='/home/ikegami/usr/perlbrew/perls/5.20.0t/bin'; installsitearch='/home/ikegami/usr/perlbrew/perls/5.20.0t/lib/site_per +l/5.20.0/x86_64-linux-thread-multi'; installsitebin='/home/ikegami/usr/perlbrew/perls/5.20.0t/bin'; installsitehtml1dir=''; installsitehtml3dir=''; installsitelib='/home/ikegami/usr/perlbrew/perls/5.20.0t/lib/site_perl +/5.20.0'; installsiteman1dir='/home/ikegami/usr/perlbrew/perls/5.20.0t/man/man1' +; installsiteman3dir='/home/ikegami/usr/perlbrew/perls/5.20.0t/man/man3' +; installsitescript='/home/ikegami/usr/perlbrew/perls/5.20.0t/bin'; installstyle='lib'; installusrbinperl='undef'; installvendorarch=''; installvendorbin=''; installvendorhtml1dir=''; installvendorhtml3dir=''; installvendorlib=''; installvendorman1dir=''; installvendorman3dir=''; installvendorscript=''; $ "${PERLBREW_ROOT:-$HOME/perl5/perlbrew}"/perls/5.18.2t/bin/perl -V:' +inst.' installarchlib='/home/ikegami/usr/perlbrew/perls/5.18.2t/lib/5.18.2/x8 +6_64-linux-thread-multi'; installbin='/home/ikegami/usr/perlbrew/perls/5.18.2t/bin'; installhtml1dir=''; installhtml3dir=''; installman1dir='/home/ikegami/usr/perlbrew/perls/5.18.2t/man/man1'; installman3dir='/home/ikegami/usr/perlbrew/perls/5.18.2t/man/man3'; installprefix='/home/ikegami/usr/perlbrew/perls/5.18.2t'; installprefixexp='/home/ikegami/usr/perlbrew/perls/5.18.2t'; installprivlib='/home/ikegami/usr/perlbrew/perls/5.18.2t/lib/5.18.2'; installscript='/home/ikegami/usr/perlbrew/perls/5.18.2t/bin'; installsitearch='/home/ikegami/usr/perlbrew/perls/5.18.2t/lib/site_per +l/5.18.2/x86_64-linux-thread-multi'; installsitebin='/home/ikegami/usr/perlbrew/perls/5.18.2t/bin'; installsitehtml1dir=''; installsitehtml3dir=''; installsitelib='/home/ikegami/usr/perlbrew/perls/5.18.2t/lib/site_perl +/5.18.2'; installsiteman1dir='/home/ikegami/usr/perlbrew/perls/5.18.2t/man/man1' +; installsiteman3dir='/home/ikegami/usr/perlbrew/perls/5.18.2t/man/man3' +; installsitescript='/home/ikegami/usr/perlbrew/perls/5.18.2t/bin'; installstyle='lib'; installusrbinperl='undef'; installvendorarch=''; installvendorbin=''; installvendorhtml1dir=''; installvendorhtml3dir=''; installvendorlib=''; installvendorman1dir=''; installvendorman3dir=''; installvendorscript=''; [download]	[reply] [d/l] [select]


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