offload: Do not abort when a machine is unreachable.
* guix/scripts/offload.scm (machine-load): Wrap 'open-ssh-session' call in 'false-if-exception'; return +inf.0 if it returns #f.
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@ -493,10 +493,11 @@ be read."
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(define (machine-load machine)
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"Return the load of MACHINE, divided by the number of parallel builds
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allowed on MACHINE."
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allowed on MACHINE. Return +∞ if MACHINE is unreachable."
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;; Note: This procedure is costly since it creates a new SSH session.
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(let* ((session (open-ssh-session machine))
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(pipe (open-remote-pipe* session OPEN_READ
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(match (false-if-exception (open-ssh-session machine))
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((? session? session)
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(let* ((pipe (open-remote-pipe* session OPEN_READ
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"cat" "/proc/loadavg"))
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(line (read-line pipe)))
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(close-port pipe)
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@ -514,6 +515,8 @@ allowed on MACHINE."
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normalized))
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(_
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+inf.0))))) ;something's fishy about MACHINE, so avoid it
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(_
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+inf.0))) ;failed to connect to MACHINE, so avoid it
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(define (machine-lock-file machine hint)
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"Return the name of MACHINE's lock file for HINT."
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