Add symlink method to util.opener. Differences from os.symlink: - the symlink name is relative to the opener base directory - if a file with that name already exists, it's removed - if necessary, parent directories are created - if the system (OS or filesystem) doesn't support symlinks, a regular file is created. Its contents are the symlink target.

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#!/bin/sh

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# http://www.selenic.com/mercurial/bts/issue433

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hg init a

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cd a

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echo a > a

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hg commit -Ama

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hg parents -r 0 doesnotexist

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true