If the argument to make_file can act like a file, return it. This is useful for code that calls command functions, but doesn't want to send I/O through the filesystem.

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#!/bin/sh -x

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hg init

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echo This is file a1 > a

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hg add a

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hg commit -t "commit #0" -d "0 0" -u user

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touch b

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hg add b

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rm b

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hg commit -A -t"comment #1" -d "0 0" -u user