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Doing CPAN Installs Using Capistrano

I’ve been trying to use Capistrano
for application deployment over the last few days, writing rules to
do some common tasks, figuring out how it works, etc. One problem I
ran into is that I have a private CPAN bundle that I use to ensure a
machine has all the right Perl libraries when I deploy to it.

The problem is that CPAN is often run interactively and so module
writers often assume the user will be present. That means that it
stops in the middle and asks questions about skipping tests, etc. I
searched for a while to figure out how to get a default answer to
questions. It’s not Capistrano’s job and CPAN didn’t seem to have a
configuration option that worked. Turns out it’s in MakeMaker.

MakeMaker is the Perl library that the CPAN modules use to automate
the build process. There’s an environment variable called
PERL_MM_USE_DEFAULT that when true causes the MakeMaker
prompt function to assume the default answer.

So, here’s the task from the capfile I came up with.

task :load_bundle, roles => :local do
     run "cd /web/lib/perl/etc/kynetx-private-bundle;
          sudo perl -MCPAN -e
             '$ENV{PERL_MM_USE_DEFAULT}=1;
              install Bundle::kobj_modules'"
end

This works fine. Of course, you also need to make sure the account
you’re using for installs can sudo without a password or this will
fail as well. Maybe there’s a better way to do sudo inside
Capistrano? I’d like to know about it.

Tags:

kynetx

sysadmin

ruby

perl

sexy girls with underwear

Doing CPAN Installs Using Capistrano

I’ve been trying to use Capistrano
for application deployment over the last few days, writing rules to
do some common tasks, figuring out how it works, etc. One problem I
ran into is that I have a private CPAN bundle that I use to ensure a
machine has all the right Perl libraries when I deploy to it.

The problem is that CPAN is often run interactively and so module
writers often assume the user will be present. That means that it
stops in the middle and asks questions about skipping tests, etc. I
searched for a while to figure out how to get a default answer to
questions. It’s not Capistrano’s job and CPAN didn’t seem to have a
configuration option that worked. Turns out it’s in MakeMaker.

MakeMaker is the Perl library that the CPAN modules use to automate
the build process. There’s an environment variable called
PERL_MM_USE_DEFAULT that when true causes the MakeMaker
prompt function to assume the default answer.

So, here’s the task from the capfile I came up with.

task :load_bundle, roles => :local do
     run "cd /web/lib/perl/etc/kynetx-private-bundle;
          sudo perl -MCPAN -e
             '$ENV{PERL_MM_USE_DEFAULT}=1;
              install Bundle::kobj_modules'"
end

This works fine. Of course, you also need to make sure the account
you’re using for installs can sudo without a password or this will
fail as well. Maybe there’s a better way to do sudo inside
Capistrano? I’d like to know about it.

Tags:

kynetx

sysadmin

ruby

perl