Shell hangs when doing command from ssh

Question

I'm trying to automate a server update process. What this should do is check for git diff files and list them, to later be copied from one place to the other.

Here's my script on my local machine:

update_frontend.sh

#!/bin/sh
ssh [login details] -t -t 'bash -s' < ~/Scripts/update_frontend_cmd.sh

update_frontend_cmd.sh

SOURCE=/var/www/git_front/mydir_front
TARGET=/var/www/front
dothis=

cd "$SOURCE"
for i in $(git diff --name-only origin/master master)
    do
    x=`echo $i | sed 's/mydir\///'`
        dothis=`echo "
$dothis
cp './mydir/$x' '$TARGET/$x'"`
    done

git pull
eval $dothis

Problem is, after any first input from me (be it login for git pull, or if I remove it, any other command I try to execute) causes the shell to hang. I just get a blank line an infinite waiting. Any idea what's causing this?

Answer 1

After your update_frontend_cmd.sh has been processed, you are at the end of the input. ssh does not simple switch back to keyboard input from that.

What you could consider is running a screen session on the remote machine and execute commands in there. Then reconnect once you are done.

A more simple possibility is pushing the script to the server (scp, or better pushing via git) and executing it locally.

Answer 2

Just omit the -t options from ssh invocation, and the session will terminate once EOF is reached on stdin.

Answer 3

This works for me:

( echo 'echo yes'; echo 'exit') | ssh me@localhost -t -t 'bash -s'

Try replacing the echo 'echo yes' with your cat.

Meow.