Tempfile: Add Tempfile.tempname
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This new method behaves similarly to the `Dir::Tempname.make_tmpname` method in Ruby in that it creates a filename that is not likely to currently exist on disk. Some key differences: * `tempname` is fully qualified with the value of `Tempfile.dirname`, while `make_tmpname` was not fully qualified by default. * `tempname` does not allow the user to specify a custom prefix. * `tempname` does not allow the user to specify a custom trailing identifier.
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For consideration: it looks like Ruby is merging |
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What exactly is the usecase? |
Programs that take a temporary filename to create instead of creating one for themselves. This happens sometimes with programs that open a socket for IPC: they need the user (or invoker) to generate the filename for them, since they don't have a facility for sharing the filename themselves. An example with MPV: tmpfile=$(mktemp -u)
mpv --input-ipc-server="${tmpfile}"
whatever-client-program "${tmpfile}" |
RX14
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asterite
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Jan 2, 2018
lukeasrodgers
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This new method behaves similarly to the `Dir::Tempname.make_tmpname` method in Ruby in that it creates a filename that is not likely to currently exist on disk. Some key differences: * `tempname` is fully qualified with the value of `Tempfile.dirname`, while `make_tmpname` was not fully qualified by default. * `tempname` does not allow the user to specify a custom prefix. * `tempname` does not allow the user to specify a custom trailing identifier.
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This new method behaves similarly to the
Dir::Tempname.make_tmpnamemethod in Ruby in that it creates a filename that is not likely
to currently exist on disk.
Some key differences:
tempnameis fully qualified with the value ofTempfile.dirname,while
make_tmpnamewas not fully qualified by default.tempnamedoes not allow the user to specify a custom prefix.tempnamedoes not allow the user to specify a custom trailingidentifier.
Like
make_tmpnamein Ruby, this implementation is susceptible to TOCTOU, and does not actually test for the file's existence beforehand -- it counts on the space ofRandom.rand(0x100000000).to_s(36)being large enough for most purposes.I'm just learning Crystal, so please let me know if there's anything I can do to improve this PR!