[Bug 3722] check ssh key (and other parameters) before running the proxy command

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3722

--- Comment #3 from Toralf Förster <toralf.foerster at gmx.de> ---
IMO ssh should not run the given proxy command, if the specified ssh
key is not valid or does not exist. But it runs the proxy command:

$ rm -f /tmp/foo

$ ssh -i ~/.ssh/non-existing-key -o proxyCommand="sh -c 'touch
/tmp/foo'" nobody at nowhere
Warning: Identity file /home/tfoerste/.ssh/non-existing-key not
accessible: No such file or directory.
Connection closed by UNKNOWN port 65535

$ ls -l /tmp/foo
-rw-r--r-- 1 tfoerste tfoerste 0 Aug 26 19:09 /tmp/foo

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