subprocess.rb revision 9a2bd735c2709ed8dd2a5e551a5a38e14c989440
# A wrapper for IO.popen that returns the combined stdout and stderr.
# An exception is thrown if the subprocess exists with non-zero.
module Subprocess
class Error < ::StandardError
attr_reader :status, :output
def initialize(args, status, output)
super "Subprocess #{args.inspect} exited with status #{status}:\n#{output}"
@status = status
@output = output
end
end
# Runs a command
# The optional hash contains environment variables
def self.run(*args)
env = stringify_keys(args.extract_options!)
args = args.map(&:to_s)
output = IO.popen env, args, err: [:child, :out] do |ls_io|
ls_io.read
end
status = $?.exitstatus
if status != 0
raise Error.new args, status, output
end
output
end
private
def self.stringify_keys(base_hash)
hash = base_hash.reduce({}) do |h, (key, value)|
h[key.to_s] = value
h
end
return hash
end
end