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tag: v2.1.1
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require 'tempfile'
# Write to a file atomically. Useful for situations where you don't
# want other processes or threads to see half-written files.
#
# File.atomic_write("important.file") do |file|
# file.write("hello")
# end
#
# If your temp directory is not on the same filesystem as the file you're
# trying to write, you can provide a different temporary directory.
#
# File.atomic_write("/data/something.important", "/data/tmp") do |f|
# file.write("hello")
# end
def File.atomic_write(file_name, temp_dir = Dir.tmpdir)
temp_file = Tempfile.new(File.basename(file_name), temp_dir)
yield temp_file
temp_file.close
File.rename(temp_file.path, file_name)
end
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