Class: Cangallo::Check

Inherits:
Object
  • Object
show all
Defined in:
lib/cangallo/check.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Check

Returns a new instance of Check.



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# File 'lib/cangallo/check.rb', line 22

def initialize
end

Instance Method Details

#check ⇒ Object 



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# File 'lib/cangallo/check.rb', line 25

def check
  problem = false

  problem ||= !check_kernel
  problem ||= !check_qemu_img
  problem ||= !check_libguestfs

  if problem
    text = <<-EOT
There is at least one problem in your system. You can go this page to
get more information on how to fix it:

https://canga.io/install/

    EOT

    STDERR.puts text
  end

  STDERR.puts <<-EOT
It's also a good idea to execute libguestfs test tool:

$ libguestfs-test-tool

EOT

  problem
end

#check_kernel ⇒ Object 



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# File 'lib/cangallo/check.rb', line 54

def check_kernel
  Dir['/boot/vmlinuz*'].each do |file|
    if File.readable?(file)
      return true
    end
  end

  help_kernel
  false
end

#check_libguestfs ⇒ Object 



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# File 'lib/cangallo/check.rb', line 112

def check_libguestfs
  version = Cangallo::LibGuestfs.version

  if !version
    text = "Could not get virt-customize version. Is libguestfs installed?"

    STDERR.puts text
    STDERR.puts
    exit(-1)
  end

  current = Gem::Version.new(version)
  good = Gem::Version.new("1.30.0")
  enough = Gem::Version.new("1.28.0")

  if current < enough
    help_libguestfs
    return false
  elsif current < good
    STDERR.puts "libguestfs >= 1.30.0 recomended"
    STDERR.puts
  end

  true
end

#check_qemu_img ⇒ Object 



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# File 'lib/cangallo/check.rb', line 76

def check_qemu_img
  version = Cangallo::Qcow2.qemu_img_version

  if !version
    text = "Could not get qemu-img version. Is it installed in your system?"

    STDERR.puts text
    STDERR.puts
    exit(-1)
  end

  good = Gem::Version.new('2.4.0')
  current = Gem::Version.new(version)

  if current >= good
    true
  else
    help_qemu_img
    false
  end
end

#help_kernel ⇒ Object 



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# File 'lib/cangallo/check.rb', line 65

def help_kernel
  text = <<-EOT
libguestfs needs a kernel to boot it's qemu appliance. There is no kernel
in your /boot directory readable by your kernel. Change the permissions of
at least one kernel in that directory to be readable by the current user.

  EOT

  STDERR.puts text
end

#help_libguestfs ⇒ Object 



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# File 'lib/cangallo/check.rb', line 138

def help_libguestfs
  text = <<-EOT
libguestfs version 1.28.0 is needed although 1.30.0 or newer is recomended.

  EOT

  STDERR.puts text
end

#help_qemu_img ⇒ Object 



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# File 'lib/cangallo/check.rb', line 98

def help_qemu_img
  text = <<-EOT
Cangallo needs a qemu-img version equal or greater than 2.4.0. Yours appears
to be older. This will make impossible to compress delta images. You can
download this qemu-img binary and add it to the path. Make sure the path
possition is before #{%x(which qemu-img).strip}.

https://canga.io/downloads/qemu-img.bz2

  EOT

  STDERR.puts text
end