hammer mirror-copy from old hammer version to new hammer version screws up completely

[Simon 'corecode' Schubert]

Matthew Dillon wrote:
:
:When performing a mirror-copy from an old hammer version to a new 
:version, no directory contents appear.  the pfs is basically unusable, 
:yet uses up disk space.
:
:THIS IS EXTREMELY ANNOYING AND DANGEROUS.  WHY IS THIS STILL NOT FIXED?
:
:This is a great opportunity to completely destroy all your data.  EXCELLENT!

    Well, this is the first time I've heard of this.  A mirror-copy
    from an old hammer to a new one should work fine in theory.  Are you
    sure you weren't copying the other way around?  Copying a new hammer
    to an old hammer would not work.
It was certainly from old to new.  This happened before and I reported 
on IRC, but considered it as an error on my part.  Now it happening 
again means that something is really wrong.

    Was it a clean mirror-copy or did you forcefully downgrade a master
    into a slave first?
Clean hammer mirror-copy /path/to/old-pfs /path/to/nonexisting-new-pfs

cheers
  simon
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