Ruby: pass environment variable to sudo script?

Question

I have a follow-up question regarding Shell out from ruby while setting an environment variable. I try to feed the environment variable to a shell script via sudo, but not successful.

This is the sample one-line script, "/usr/bin/wrapper.sh".

echo $MYVAR

Test,

$ irb
> system({'MYVAR' => "42"}, "echo $MYVAR")        ==> GOOD
> system({'MYVAR' => "42"}, "wrapper.sh")         ==> GOOD
> system({'MYVAR' => "42"}, "sudo echo $MYVAR")   ==> GOOD
> system({'MYVAR' => "42"}, "sudo wrapper.sh")    ==> NOT GOOD

Thanks for the help.

I'm not sure if there's a way to flag that variable as export so it affects subshells. wrapper.sh is not running in the same process as sudo's immediate shell. Does ENV['MYVAR'] = 42 before running it propagate properly? — tadman
– tadman, Commented Apr 3, 2017 at 19:04

garyboland · Accepted Answer · 2017-04-03 19:18:37Z

1

you need sudo -E

$ irb
>> system({'MYVAR' => "42"}, "sudo wrapper.sh")
=> true
>> system({'MYVAR' => "42"}, "wrapper.sh")
42
=> true
>> system({'MYVAR' => "42"}, "sudo -E wrapper.sh")
42
=> true
>>

answered Apr 3, 2017 at 19:18

garyboland

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