Using RVM with Cron

[Wardrop]

I have a bash script I'm calling as a cron job. This bash script calls multiple ruby scripts. I'm struggling to find the best method of configuring the appropriate ruby version to use. I want to avoid editing the bash script or ruby scripts, as these should be portable and shouldn't contain hardcoded environment-specific stuff.

Here's an example of what I'm trying to do. In this scenario, my RVM default ruby version is RVM is 2.3. My ruby script, titled my_ruby_script.rb below, requires ruby 2.5. How do I achieve this?

/etc/cron.d/my_bash_script

SHELL=/usr/local/rvm/bin/rvm-shell
* * * * * root /opt/project/my_bash_script_.sh

/opt/project/my_bash_script.sh_

#!/usr/bin/env bash
/opt/project/my_ruby_script.rb

/opt/project/my_ruby_script.rb

#!/usr/bin/env ruby
puts "Hello, I need ruby 2.5.0"

I've tried a few things, including doing the following in my cron file, but I get "RVM is not a function ...".

SHELL=/usr/local/rvm/bin/rvm-shell
* * * * * root rvm use ruby-2.5 && /opt/project/my_bash_script_.sh

I've also tried creating a .ruby-version file, and cd'ing into the directory like so, but it's not respecting what's in .ruby-version, and still uses the RVM default ruby.

SHELL=/usr/local/rvm/bin/rvm-shell
* * * * * root cd /opt/project/ && ./my_bash_script_.sh

None of the RVM documentation has managed to help me. All the cron-related examples it gives call a ruby script directly which is much more trivial. Any advice?

[Wardrop]

Ok, I found the following which seems to work:

SHELL=/usr/local/rvm/bin/rvm-shell
* * * * * source "/usr/local/rvm/scripts/rvm" && rvm use ruby-2.5 &&  /opt/project/my_bash_script_.sh

Shouldn't rvm-shell be sourcing that for me? Is that the best or "most correct" way to achieve this?

[mpapis]

you could use .ruby-version with /usr/local/rvm/bin/rvm /opt/project/ do ./my_bash_script_.sh or specify the version like this /usr/local/rvm/bin/rvm 2.5.0 do /opt/project/my_bash_script_.sh

[duffyjp]

@Wardrop I've been doing my cron like this for years:

🍕 $ crontab -l

* * * * * /bin/bash -l -c 'ruby /Users/duffyjp/scripts/log-cpu.rb' &>/tmp/cpu_log.txt

I like doing it this way as you don't have to worry about pulling the rug out from other scheduled tasks by changing the SHELL for everything.

[Tuman829]

rvm cron setup should add the variables to your crontab

[sroller]

rvm cron setup

hangs on my system :-(. I have do Ctrl-Z + kill %1
not even Ctrl-C stops it.