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I'm trying to run an alias over ssh that runs another alias via ssh. Is this possible?

I was looking at this question about running aliases over ssh and I got this so far:

ssh develop -t /bin/bash -ic "gotoserver"

gotoserver is an alias that runs:

ssh -o StrictHostKeyChecking=no -l user 10.10.10.10

This all works and I end up to 10.10.10.10. But I'm looking to run another alias inside 10.10.10.10 so I tried this:

ssh develop -t /bin/bash -ic "gotoserver -t /bin/bash -ic 'loaddocker'"

But it's not working. It seems to only recognize until gotoserver. I still end up at 10.10.10.10 but the rest of the command (-t /bin/bash -ic 'loaddocker') seems to be ignored.

But if I go inside develop and run:

gotoserver -t /bin/bash -ic 'loaddocker'

It works and loaddocker is executed.

What am I doing wrong? And can I do this another way without changing anything in develop and 10.10.10.10?

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  • 2
    Can you say something about what is actually happening when you try to run that command that you say does not work? Like, what does it actually end up doing? Any error messages? Why do you quote loaddocker? Commented Aug 5, 2021 at 13:33
  • 1
    Yes I described it: It seems to only recognize until gotoserver meaning I still end up at 10.10.10.10 but the rest of the command seems to be ignored. I will update my question Commented Aug 5, 2021 at 13:35
  • Is there any reason you favor ssh develop to then ssh smthingelse instead of just using a jump? Commented Aug 7, 2021 at 1:07
  • develop serves like a bastion so I need to get through it first. The only way to get to smthingelse is through develop Commented Aug 7, 2021 at 1:09

2 Answers 2

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+50

use functions insteed of aliases!

function fnchunk () {
    echo -n function\ ;
    typeset -f ${@}
}

function requote () 
{ 
    if (($#)); then
        local re savedq='#...___+++...#' dblquote='"' singlequote="'" escapedsinglequote="\'" escapeddblquote='\"';
        re="$(printf "${savedq}%s${savedq} " "${@}")";
        re="${re//${dblquote}/${escapeddblquote}}";
        echo "${re//${savedq}/${dblquote}}";
    fi
}

function loadDockerWrapper(){
    echo loaddocker # call loadDocker script not alias
    # or if it was an alias turn it into function here
}

function gotoserver(){
    /usr/bin/ssh -o StrictHostKeyChecking=no -l user 10.10.10.10 -tq "$(fnchunk fnchunk requote gotoserver loadDockerWrapper)" ";" $(requote "${@}")
}

function devCmd(){
    /usr/bin/ssh -tq develop "$(fnchunk fnchunk requote gotoserver loadDockerWrapper)" ";" $(requote "${@}")
}

devCmd gotoserver loadDockerWrapper
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  • The aliases are dynamically generated, for example the ip in gotoserver can change, and the docker container id for loaddocker can change as well so I was looking for an approach to always call the alias. For now I have no control of changing those alias in the remote to functions. But I will try this and see if it works. Thank you! Commented Aug 9, 2021 at 1:18
  • It works. Can you explain what fnchunk and requote is doing? Using this backbone, is it not possible to execute aliases instead? Commented Aug 9, 2021 at 4:29
  • requote re-quotes your arguments in case you give more args containning spaces, fnchunk gives you the function's body chunk (like func.toString() in js). Commented Aug 9, 2021 at 10:04
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gotoserver should contain something like $@ as for all gotoserver arguments. You can use it this way:

ssh -o StrictHostKeyChecking=no -l user 10.10.10.10 $@

where $@ will be all arguments passed to gotoserver and for ssh it will be a command to issue on 10.10.10.10.

Also, you can issue few commands one after another by separating them with ;, for example:

echo a ; echo b
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