usage: svnsync initialize DEST_URL SOURCE_URL
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Initialize a destination repository for synchronization from
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another repository.
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If the source URL is not the root of a repository, only the
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specified part of the repository will be synchronized.
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The destination URL must point to the root of a repository which
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has been configured to allow revision property changes. In
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the general case, the destination repository must contain no
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committed revisions. Use --allow-non-empty to override this
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restriction, which will cause svnsync to assume that any revisions
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already present in the destination repository perfectly mirror
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their counterparts in the source repository. (This is useful
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when initializing a copy of a repository as a mirror of that same
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repository, for example.)
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You should not commit to, or make revision property changes in,
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the destination repository by any method other than 'svnsync'.
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In other words, the destination repository should be a read-only
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mirror of the source repository.