[ET Trac] [Einstein Toolkit] #545: Use ssh ProxyCommand instead of multiple ssh commands

[Einstein Toolkit]

#545: Use ssh ProxyCommand instead of multiple ssh commands
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  Reporter:  eschnett     |       Owner:  eschnett
      Type:  enhancement  |      Status:  review  
  Priority:  major        |   Milestone:          
 Component:  SimFactory   |     Version:          
Resolution:               |    Keywords:          
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Comment (by eschnett):

 Quoting is independent of the shell. It is also rather simple, because a
 shell does not interpret any characters as special within single quotes.
 The only thing left to do is to quote single quotes themselves; this can
 be done either by prepending a backslash, or by enclosing it in double
 quotes. Both become impossible to decipher if there are more than two
 levels of quoting.

 One also needs to know that there needs to be an unquoted space to
 separate arguments. For example,

 Hello' 'World

 is a single argument. So, to quote in a single-quote-delimited string, one
 first has to end the string (single quote), then add a quoted quote
 (backslash - single quote), then begin the string again (single quote).

 The general quoting rule is:
 1.  replace any single quote by '\'' (single quote - backslash - single
 quote - single quote)
 2. surround the string by single quotes

 We could us a shellquote module for this, but the corresponding Python
 function is just two lines long, so this may be overkill.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/545#comment:8>
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