[fanf2]

I didn't realise yesterday that svn also uses SHA1 for deduplicating pristine filed in its working copy. So disabling rep-sharing isn't enough to prevent broken checkouts: you need to prevent any SHA1 collisions from being committed. See the link from Stefan Sperling (stsp) to the collision rejection script elsewhere in this thread. There is more info about what they need to do to fix this from Stefan at http://mail-archives.apache.org/mod_mbox/subversion-dev/2017...