Cant run Ruby script via gem "ssh-net"

Question

I am using gem net-ssh.

The connection is established. I am able to run some simple scripts(like "pwd", "ls", etc.) successfully, but when I run the "restart" script I get an error.

Here is a snippet:

output = ssh.exec!("cd /home/csrhub/git/csrhub-api; ./bin/restart")
puts "#{output}"

And the output:

./bin/restart:7:in exec': No such file or directory - bundle (Errno::ENOENT) from ./bin/restart:7:in' Environment determined as "development" based on the .environment file. Loading application.yml

And here is the script where the error occurs.

#!/usr/bin/env ruby

require 'yaml'
require_relative '../app/models/environment.rb'
config = Environment.config('application')

exec "bundle exec pumactl --control-url tcp://127.0.0.1:#{config['control_port']} --control-token #{config['control_token']} phased-restart"

Connecting via Putty, when I run the same command it gets executed without any problems.

EDIT

The PATH variable is different when I Putty:

/home/csrhub/.rbenv/shims:/home/csrhub/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

And when I run with net-ssh PATH is:

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games

Don't cd -- Just run /home/csrhub/git/csrhub-api/bin/restart — Zak
– Zak, Commented Jul 23, 2019 at 16:23
Check what is in the .bashrc on your server, it might have something ruby-specific. Replicate that to .bash_profile. There's a difference between running interactively and non-interactively. — phil pirozhkov
– phil pirozhkov, Commented Jul 23, 2019 at 17:10
@philpirozhkov docs.google.com/document/d/… docs.google.com/document/d/… — Hairi
– Hairi, Commented Jul 23, 2019 at 17:50
Seems like a PATH issue. The PATH for your ssh-net shell session is not the same as for your Putty session. This may be the reason the bundle command can not be found. — Casper
– Casper, Commented Jul 23, 2019 at 17:54

Casper · Accepted Answer · 2019-07-23 21:52:10Z

2

The problem is in your ssh.exec! call. Net::SSH does not use a login shell to run your commands. A login shell is required for Bash to execute .bash_profile.

Since your rbenv setup is in .bash_profile, your exec! call will be missing your full Ruby environment, and therefore running bundle later in you restart script will fail.

The solution should be to manually execute .bash_profile, so that rbenv gets loaded:

output = ssh.exec!("source ~/.bash_profile; ...rest of commands...")

More information and other proposals here:
net-ssh and remote environment

edited Jul 23, 2019 at 21:52

answered Jul 23, 2019 at 18:37

Casper

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