thin-provisioning-tools/thin-provisioning/create_xml_data

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#!/usr/bin/env ruby
#
# Copyright (C) 2013 Red Hat, GmbH
#
# Simple XML metadata creation tool
#
require 'optparse'
require 'pathname'
#----------------------------------------------------------------
$prg = Pathname.new($0).basename
def init_units
units = {}
units[:bytes_per_sector] = 512
units[:chars] = "bskKmMgGtTpPeEzZyY"
units[:strings] = [ 'bytes', 'sectors',
'kilobytes', 'kibibytes', 'megabytes', 'mebibytes',
'gigabytes', 'gibibytes', 'terabytes', 'tebibytes',
'petabytes', 'pebibytes', 'exabytes', 'ebibytes',
'zetabytes', 'zebibytes', 'yottabytes', 'yobibytes' ]
units[:factors] = [ 1, units[:bytes_per_sector] ]
1.step(8) { |e| units[:factors] += [ 1024**e, 1000**e ] }
units
end
def get_index(unit_char, units)
unit_char ? units[:chars].index(unit_char) : 1
end
def to_sectors(size, units)
a = size.split(/[#{units[:chars]}]/)
s = size.to_i.to_s
abort "#{$prg} - only one unit character allowed!" if a.length > 1 || size.length - s.length > 1
abort "#{$prg} - invalid unit specifier!" if s != a[0]
size.to_i * units[:factors][get_index(size[a[0].length], units)] / units[:bytes_per_sector]
end
def check_opts(opts)
abort "#{$prg} - 3 arguments required!" if opts.length < 3
abort "#{$prg} - block size must be > 0" if opts[:blocksize] <= 0
abort "#{$prg} - size must be much greater/equal blocksize" if opts[:thinsize] < opts[:blocksize]
abort "#{$prg} - number of thin provisioned devices or snapshots must be > 0" if opts[:thins].nil? || opts[:thins] == 0
abort "#{$prg} - size variation too large!" if !opts[:variation].nil? && (opts[:variation] > 2 * (opts[:thinsize] - opts[:blocksize]))
end
def parse_command_line(argv, units)
opts = {}
os = OptionParser.new do |o|
o.banner = "Thin Provisioning XML Test Metadata Generator.\nUsage: #{$prg} [opts]"
o.on("-b", "--block-size BLOCKSIZE[#{units[:chars]}]", String,
"Block size of thin provisioned devices.") do |bs|
opts[:blocksize] = to_sectors(bs, units)
end
o.on("-s", "--thin-size SIZE[#{units[:chars]}]", String, "Average size of thin devices and snapshots.") do |sz|
opts[:thinsize] = to_sectors(sz, units)
end
o.on("-r", "--range-mappings", "Create range mappings") do
opts[:range] = true
end
o.on("-t", "--thins #THINS", Integer, "Sum of thin devices and snapshots.") do |mt|
opts[:thins] = mt
end
o.on("-v", "--size-variation SIZE[#{units[:chars]}]", String, "Size variation of thin devices and snapshots.") do |sv|
opts[:variation] = to_sectors(sv, units)
end
o.on("-h", "--help", "Output this help.") do
puts o
exit
end
end
begin
os.parse!(argv)
rescue OptionParser::ParseError => e
abort "#{$prg} #{e}\n#{$prg} #{os}"
end
check_opts(opts)
opts
end
def begin_superblock(blocksize, nr_data_blocks)
"<superblock uuid=\"\" time=\"0\" transaction=\"1\" data_block_size=\"#{blocksize}\" nr_data_blocks=\"#{nr_data_blocks}\">\n"
end
def end_superblock
"</superblock>\n"
end
def begin_device(devid, size)
" <device dev_id=\"#{devid}\" mapped_blocks=\"#{size}\" transaction=\"0\" creation_time=\"0\" snap_time=\"0\">\n"
end
def end_device
" </device>\n"
end
def single_mapping(from, to)
" <single_mapping origin_block=\"#{from}\" data_block=\"#{to}\" time=\"1\"/>\n"
end
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def range_mapping(from, to, length)
" <range_mapping origin_begin=\"#{from}\" data_begin=\"#{to}\" length=\"#{length}\" time=\"1\"/>\n"
end
def blocks(opts)
opts[:thinsize] / opts[:blocksize]
end
def this_blocks(opts)
opts[:variation].nil? ? blocks(opts) : (2 * opts[:thinsize] - rand(opts[:variation])) / 2 / opts[:blocksize]
end
def xml_metadata(opts, units)
nr_data_blocks, to = 0, 0
blks = []
0.step(opts[:thins] - 1) do
blks << this_blocks(opts)
nr_data_blocks += blks[-1]
end
puts begin_superblock(opts[:blocksize], nr_data_blocks)
0.step(opts[:thins] - 1) do |dev_id|
b = blks.shift
puts begin_device(dev_id, b)
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if opts[:range]
puts range_mapping(0, to, b)
to += b
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else
0.step(b - 1) do |from|
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puts single_mapping(from, to)
to += 1
end
end
puts end_device
end
puts end_superblock
end
#----------------------------------------------------------------
# Main
#
xml_metadata(parse_command_line(ARGV, (units = init_units)), units)