On Wed May 30 17:57:49 EDT 2012, Nataraj wrote:
> On Wed, May 30, 2012 17:00, James B. Byrne wrote:
>> I am trying, without success, to create an upstart config file to
>> automatically start and restart an ssh proxy. The command sting that
>> I use in the script has been checked and verified from the shell but
>> it fails in the upstart file.
>>
> The '-f option' tells SSH to run in the background, but normally
> upstart expects to wait for the process. Maybe you want '-n'
> instead of '-f'. Alternatively, if you run a program in the
> background you could specify 'task' in the config file to tell
> upstart not to wait for the process (you couldn't use respawn
> with that because then the process is not managed by upstart
> anymore).
The problem in my script appears to be this:
# SSH switches used:
env SSH_SWITCHES=""
env SSH_SWITCHES=${SSH_SWITCHES}" -nNqT -vvv "
Upon further investigation I discovered that the env stanza does not
expand previously defined variables. My attempt at concatenating
values results in the key name being used instead of its value.
In other words: '${SSH_SWITCHES} -nNqT -vvv' is what results and not
simply '-nNqT -vvv' as one might expect. Exporting the value between
env stanzas does not change this behaviour.
Eliminating the concatenation attempts resolved the issue.
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James B. Byrne mailto:ByrneJB at Harte-Lyne.ca
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