thin-provisioning-tools/features/support/world_extensions.rb

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module ThinpWorld
def tools_version
"0.1.5+"
end
def xml_file
'metadata.xml'
end
def dev_file
'metadata.bin'
end
def corrupt_block(n)
write_block(n, change_random_byte(read_block(n)))
end
# FIXME: we should really break out the xml stuff from
# thinp-test-suite and put in a gem in this repo.
def write_valid_xml(path)
File.open(path, "w+") do |f|
f.write <<EOF
<superblock uuid="" time="0" transaction="0" data_block_size="128" nr_data_blocks="1000">
<device dev_id="0" mapped_blocks="2" transaction="0" creation_time="0" snap_time="0">
<range_mapping origin_begin="0" data_begin="0" length="2" time="0"/>
</device>
</superblock>
EOF
end
end
private
def read_block(n)
b = nil
File.open(dev_file, "r") do |f|
f.seek(n * 4096)
b = f.read(4096)
end
b
end
def write_block(n, b)
File.open(dev_file, "w") do |f|
f.seek(n * 4096)
f.write(b)
end
end
def change_random_byte(b)
i = rand(b.size)
puts "changing byte #{i}"
b.setbyte(i, (b.getbyte(i) + 1) % 256)
b
end
end
World(ThinpWorld)