37 lines
1.2 KiB
Ruby
37 lines
1.2 KiB
Ruby
module Vagrant
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module Util
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# This module provies a `safe_exec` method which is a drop-in
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# replacement for `Kernel.exec` which addresses a specific issue
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# which manifests on OS X 10.5 (GH-51) and perhaps other operating systems.
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# This issue causes `exec` to fail if there is more than one system
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# thread. In that case, `safe_exec` automatically falls back to
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# forking.
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class SafeExec
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def self.exec(command, *args)
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# Create a list of things to rescue from. Since this is OS
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# specific, we need to do some defined? checks here to make
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# sure they exist.
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rescue_from = []
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rescue_from << Errno::EOPNOTSUPP if defined?(Errno::EOPNOTSUPP)
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rescue_from << Errno::E045 if defined?(Errno::E045)
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rescue_from << SystemCallError
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fork_instead = false
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begin
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pid = nil
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pid = fork if fork_instead
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Kernel.exec(command, *args) if pid.nil?
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Process.wait(pid) if pid
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rescue *rescue_from
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# We retried already, raise the issue and be done
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raise if fork_instead
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# The error manifested itself, retry with a fork.
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fork_instead = true
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retry
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end
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end
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end
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end
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end
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