The file-temp library is an alternate way to handle tempfile generation.

• ffi 1.1.0 or later

gem install file-temp

gem cert --add <(curl -Ls https://raw.githubusercontent.com/djberg96/file-temp/main/certs/djberg96_pub.pem)

require 'file/temp'

fh = File::Temp.new
fh.puts "hello"
fh.close # => Tempfile automatically deleted

fh = File::Temp.new(delete: false)
fh.puts "world"
fh.close # => Tempfile still on your filesystem

Unlike the tempfile library that ships with Ruby's standard library, this library uses your system's native tmpfile or mkstemp functions.

This library is also more secure because it restricts file permission via umask for files created with mkstemp.

Finally, this library subclasses the File class. This means you get almost exactly the same interface as the File class. The only difference is the constructor.

Note that my original motivation was a problem with race conditions in the tempfile library, but that was a very long time ago, and my assumption at this point is that it's no longer true. But, I still prefer this version to the one in the Ruby standard library.

The implementation for JRuby uses the Java API, not the C API. The temporary file name generated by Java is different than the C version, since it uses a GUID instead of the 'XXXXXX' template, but the interface is otherwise identical.

As of version 1.7.2 there is a known issue with using File::Temp.open vs File::Temp.new. See jruby/jruby#7847 for more details.

You may need to use the mingw build in order to use this library.

Also, there was a bug with the GetTempFileName function on certain versions of MS Windows that may cause a failure. However, if you're patched up you should not see it.

Apache-2.0

(C) 2007-2023 Daniel J. Berger All Rights Reserved

This library is provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose.

Daniel J. Berger

tmpfile(), mkstemp(), tmpnam()