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Ruby bindings for Augeas
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README.rdoc

Ruby bindings for augeas

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The class Augeas provides bindings to augeas [augeas.net] library.

Usage: Setting Data

Augeas::create do |aug|
  aug.set("/files/etc/sysconfig/firstboot/RUN_FIRSTBOOT", "YES")
  unless aug.save
    raise IOError, "Failed to save changes"
  end
end

Usage: Accessing Data

firstboot = Augeas::create {
  |aug| aug.get("/files/etc/sysconfig/firstboot/RUN_FIRSTBOOT") }

Usage: Removing Data

Augeas::create do |aug|
  aug.rm("/files/etc/sysconfig/firstboot/RUN_FIRSTBOOT")
  unless aug.save
    raise IOError, "Failed to save changes"
  end
end

Usage: Minimal Setup with a Custom Root

By passing using the :no_modl_autoload flag, no files are read on startup; that allows setting up a custom transform.

Augeas::create(:root => "/var/tmp/augeas-root",
               :loadpath => "/usr/local/share/mylenses",
               :no_modl_autoload => true) do |aug|
  aug.transform(:lens => "Aliases.lns", :incl => "/etc/aliases")
  aug.load
  aug.get("/files/etc/aliases/*[name = 'postmaster']/value")
end

Build Dependencies

To build or install this gem manually, headers for libaugeas and libxml are needed. Additionally the pkg-config tool has to be installed.

Deprecation Warning

The Augeas API has been heavily rewritten in order to better support errors.

To use the new API, just use Augeas::create instead of Augeas::open. This is the documentation for the Augeas::create method.

Create a new Augeas instance and return it.

Use :root as the filesystem root. If :root is nil, use the value of the environment variable AUGEAS_ROOT. If that doesn't exist either, use “/”.

:loadpath is a colon-spearated list of directories that modules should be searched in. This is in addition to the standard load path and the directories in AUGEAS_LENS_LIB.

The following flags can be specified in a hash. They all default to false and can be enabled by setting them to true

:type_check - typecheck lenses (since it can be very expensive it is not done by default)

:no_stdinc - do not use the builtin load path for modules

:no_load - do not load the tree during the initialization phase

:no_modl_autoload - do not load the tree during the initialization phase

:enable_span - track the span in the input nodes

:save_mode can be one of :backup, :newfile, :noop as explained below.

:noop - make save a no-op process, just record what would have changed

:backup - keep the original file with an .augsave extension

:newfile - save changes into a file with an .augnew extension and do
not overwrite the original file.

When a block is given, the Augeas instance is passed as the only argument into the block and closed when the block exits. With no block, the Augeas instance is returned.