Module: Diskman::System

Defined in:
lib/diskman/system.rb

Class Method Summary collapse

Class Method Details

.bytes2human(b) ⇒ Object

Convert bytes into a human-friendly representation.



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# File 'lib/diskman/system.rb', line 22

def self.bytes2human(b)
    return '0B' if b <= 0

    # Use 1000 to match the misleading way disk capacities are
    # advertised.
    k = 1000

    suffixes = ['T', 'G', 'M', 'K', 'B']

    suffixes.each_with_index do |suffix, i|
        threshold = k ** (suffixes.length - i - 1)
        if b >= threshold
            return (b / threshold).to_s + suffix
        end
    end
end

.exec!(cmd, safe: true, sudo: true) ⇒ Object

Execute a command. If sudo is true, ensures sudo is ready before running the command. If safe is true, ensures the user definitely wants to run the command before running it.



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# File 'lib/diskman/system.rb', line 14

def self.exec!(cmd, safe: true, sudo: true)
    Confirmer.check! if safe
    prepare_sudo_session! if sudo
    puts
    exec cmd
end

.prepare_sudo_session! ⇒ Object

If sudo prompts for the password when a pipeline with pv has already started then we’re unable to enter the password. Run sudo –validate first to ensure that we are preauthenticated.



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# File 'lib/diskman/system.rb', line 6

def self.prepare_sudo_session!
    system('sudo --validate')
end