Secret phase prevents fast local cloning

[Kim Randell]

Hello,

I've been attempting to create hardlinked clones of my local repository, and after some experimentation determined that changesets with secret phase prevent hardlinks or file copies, falling back on the slow pull clone. Eventually I found this in the source:

        if (srcrepo and srcrepo.cancopy() and islocal(dest)
            and not phases.hassecret(srcrepo)):
            copy = not pull and not rev

Which ultimately originated with this change:
http://selenic.com/repo/hg/annotate/2072e4031994/mercurial/localrepo.py#l631

This doesn't appear to be documented anywhere - perhaps it should be added to http://selenic.com/hg/help/clone, http://mercurial.selenic.com/wiki/HardlinkedClones, or http://mercurial.selenic.com/wiki/Phases ?

--
Kim

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