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module Vagrant
module Util
# This module provies a `safe_exec` method which is a drop-in
# replacement for `Kernel.exec` which addresses a specific issue
# which manifests on OS X 10.5 (GH-51) and perhaps other operating systems.
# This issue causes `exec` to fail if there is more than one system
# thread. In that case, `safe_exec` automatically falls back to
# forking.
module SafeExec
def safe_exec(command)
# Create a list of things to rescue from. Since this is OS
# specific, we need to do some defined? checks here to make
# sure they exist.
rescue_from = []
rescue_from << Errno::EOPNOTSUPP if defined?(Errno::EOPNOTSUPP)
rescue_from << Errno::E045 if defined?(Errno::E045)
rescue_from << SystemCallError
fork_instead = false
begin
pid = nil
pid = fork if fork_instead
Kernel.exec(command) if pid.nil?
Process.wait(pid) if pid
rescue *rescue_from
# We retried already, raise the issue and be done
raise if fork_instead
# The error manifested itself, retry with a fork.
fork_instead = true
retry
end
end
end
end
end
Version data entries
17 entries across 17 versions & 2 rubygems