filesystem/paths_and_locks.rb

tests/_examples/filesystem/paths_and_locks.rb in the metorex repository.

# `dirname` drops the last part of a path, and a level says how many parts
# to drop.
puts File.dirname("/home/jason/poot.txt")
puts File.dirname("/home/jason/poot.txt", 2)
puts File.dirname("/////foo/bar/")
puts File.dirname("poot.txt")
puts File.dirname("/foo/../.")

# A lock on a whole file, taken and let go.
path = File.join(Dir.tmpdir, "metorex_lock_example")
File.write(path, "held")
File.open(path, "r+") do |stream|
  puts stream.flock(File::LOCK_EX).to_s
  puts stream.flock(File::LOCK_UN).to_s
end
File.delete(path)

Output:

/home/jason
/home
/foo
.
/foo/..
0
0