Module: Yast::RSpec::SCR

Defined in:
src/ruby/yast/rspec/scr.rb

Overview

RSpec extension to handle several agent operations.

Instance Method Summary collapse

Instance Method Details

#change_scr_root(directory) ⇒ Object

Encapsulates SCR calls into a chroot.

If a block if given, the SCR calls in the block are executed in the chroot and the corresponding SCR instance is automatically closed when the block ends (or if an exception is raised by the block).

If a block is not given, the chroot must be explicitly closed calling reset_root_path.

Nesting of chroots is forbidden and the method will raise an exception if is called without closing a previous chroot.

Examples:

Usage with a block

change_scr_root("/home/chroot1") do
  # This reads the content of /home/chroot1/
  Yast::SCR.Read(path(".target.dir"), "/")
end

Usage without a block

change_scr_root("/home/chroot1")
# This reads the content of /home/chroot1/
Yast::SCR.Read(path(".target.dir"), "/")
reset_scr_root

Usage within RSpec

describe YaST::SCR do
  around { |example| change_scr_root("/home/chroot1", &example) }

  describe "#Read" do
    it "works with the .proc.meminfo path"
      # This reads from /home/chroot1/proc/meminfo
      values = Yast::SCR.Read(path(".proc.meminfo"))
      expect(values).to include("key" => "value")
    end
  end
end

Parameters:

  • directory (#to_s) —

    directory to use as '/' for SCR calls



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# File 'src/ruby/yast/rspec/scr.rb', line 46

def change_scr_root(directory)
  if @scr_handle
    raise "There is already an open chrooted SCR instance, "\
      "a call to reset_scr_root was expected"
  end

  if !File.directory?(directory)
    raise "#{directory} is not a valid directory"
  end

  @scr_original_handle = Yast::WFM.SCRGetDefault
  check_version = false
  @scr_handle = Yast::WFM.SCROpen("chroot=#{directory}:scr", check_version)
  if @scr_handle < 0
    @scr_handle = nil
    @scr_original_handle = nil
    raise "Error creating the chrooted SCR instance"
  end
  Yast::WFM.SCRSetDefault(@scr_handle)

  return unless block_given?

  begin
    yield
  ensure
    reset_scr_root
  end
end

#reset_scr_root ⇒ Object

Resets the SCR calls to prior behaviour, closing the SCR instance open by the call to #change_scr_root.

Raises an exception if #change_scr_root has not been called before or if the corresponding instance has already been closed.

See Also:



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# File 'src/ruby/yast/rspec/scr.rb', line 82

def reset_scr_root
  if @scr_handle.nil?
    raise "Unable to find a chrooted SCR instance to close"
  end

  default_handle = Yast::WFM.SCRGetDefault
  if default_handle != @scr_handle
    raise "Error closing the chrooted SCR instance, "\
      "it's not the current default one"
  end

  Yast::WFM.SCRClose(default_handle)
  Yast::WFM.SCRSetDefault(@scr_original_handle)
ensure
  @scr_handle = nil
  @scr_original_handle = nil
end