ssh and rsync in one command line from Ruby - ruby

Question

I need to write a bash command line that uses ssh to connect to "first_machine" and from here run rsync to another machine remoteuser#10.2.2.150.
This is my code:
first_machine = user#192.16.58.12
cmd="ssh #{first_machine} \"rsync -e\"ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null\" --archive -H /home/user/aaaaa remoteuser#10.2.2.150:/home/remoteuser/\" "
exit_status = system("#{cmd}")
I tested the ssh command and also the rsync separately. They work fine, so I can do ssh from the machine where I run the Ruby script and:
rsync -e"ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null" --archive -H /home/user/aaaaa remoteuser#10.2.2.150:/home/remoteuser/
works well when launched in the #{first_machine} -> folder is copied.
Instead, when I run my code through the Ruby script I receive the error:
Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,password).
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(605) [sender=3.0.9]
This error does not occur if I run the command separately.

Answer 1

First, fix the user problems pointed out by the Tin Man in the other answer. Do you have public key authentication set up between first_machine and the user running the ruby script?
Then, look at your quoting and you'll see that the command you're passing to ssh consists only of rsync -e. Maybe try this:
first_machine = 'user#192.16.58.12'
cmd="ssh #{first_machine} \"rsync -e 'ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null' --archive -H /home/user/aaaaa remoteuser#10.2.2.150:/home/remoteuser/\" "
exit_status = system(cmd)
Disclaimer: I've never used Ruby before, but a 2 minute glance at some tutorial sites made it clear you've got syntax errors in your sample code.
Is there a reason not to do this as a bash script?

Answer 2

When you "run the command separately", you're running it as a user with known permissions and an environment that's set.
Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,password).
is your hint that the permissions aren't right for the account when it logs in from the code. This isn't a Ruby problem, it's a result of not using the right account, or not setting up the environment; It's outside Ruby.