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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hg init

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echo a > a

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hg ci -Am t

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hg mv a b

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hg ci -Am t1

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hg debugrename b

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hg mv b a

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hg ci -Am t2

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hg debugrename a

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echo % test with --rev

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hg debugrename --rev 1 b

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