mirror of
https://github.com/NixOS/mobile-nixos.git
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87 lines
2.5 KiB
Ruby
87 lines
2.5 KiB
Ruby
# "System" helpers.
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module System
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class CommandError < StandardError
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end
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class CommandNotFound < CommandError
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end
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class MountError < StandardError
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end
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# Runs and pretty-prints a command. Parameters and shelling-out have the same
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# meaning as with +Kernel#spawn+; one parameter is shelling-out, multiple is
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# direct +exec+.
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#
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# @param args [Array<String>] Command and parameters
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# @raise [System::CommandNotFound] on exit status 127, commonly used for command not found.
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# @raise [System::CommandError] on any other exit status.
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def self.run(*args)
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pretty_command =
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if args.length == 1
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args.first
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else
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args.shelljoin
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end
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$logger.debug(" $ #{pretty_command}")
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unless system(*args)
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raise CommandError.new("Could not execute `#{pretty_command}`, status nil") if $?.nil?
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status = $?.exitstatus
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if status == 127
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raise CommandNotFound.new("Command not found... `#{pretty_command}` (#{status})")
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else
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raise CommandError.new("Command failed... `#{pretty_command}` (#{status})")
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end
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end
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end
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# Mounts a filesystem of type +type+ on +dest+.
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#
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# The +source+ parameter is optional, though kept first to keep a coherent
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# order compared to the actual +mount+ command.
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#
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# @overload mount(source, dest, type:)
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# @param source [String] (Optional) mount source, defaults to type
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# @param dest [String] Destination path to mount to
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# @param type [String] Type of the mount (+-t+).
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# @param options [Array<String>] Mount options (+-o+).
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# @overload mount(dest, type:)
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# @param dest [String] Destination path to mount to
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# @param type [String] Type of the mount (+-t+).
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# @param options [Array<String>] Mount options (+-o+).
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def self.mount(source, dest = nil, type: nil, options: nil)
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# Fill-in the "reversed" optional parameters.
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unless dest
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dest = source
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source = type
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end
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if source.nil? and type.nil?
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raise MountError.new("Cannot mount when missing both source and type.")
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end
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args = []
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if type
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args << "-t"
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args << type
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end
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if options
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args << "-o"
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args << options.join(",")
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end
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args << source
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args << dest
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run("mount", *args)
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end
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def self.failure(code, message="(No details given)", color: "000000")
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System.run("ply-image", "--clear=0x#{color}", "/sad-phone.png")
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$logger.fatal("#{code}: #{message}")
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sleep(10)
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hard_reboot
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end
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def self.hard_reboot()
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File.write("/proc/sysrq-trigger", "b\n")
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end
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end
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