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