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**Note** this is a security fix release. While the security
hole needs perhaps some social engineering to exploit, a prompt upgrade is
strongly recommended.

git-annex 6.20170818 released with [[!toggle text="these changes"]]
[[!toggleable text="""
   * Security fix: Disallow hostname starting with a dash, which
     would get passed to ssh and be treated an option. This could
     be used by an attacker who provides a crafted repository url
     to cause the victim to execute arbitrary code via -oProxyCommand.
     (The same class of security hole recently affected git itself.)
   * git-annex.cabal: Deal with breaking changes in Cabal 2.0.
   * Fix build with QuickCheck 2.10.
   * fsck: Support --json.
   * move, copy: Support --batch.
   * Added GIT\_ANNEX\_VECTOR\_CLOCK environment variable, which can be used to
     override the default timestamps used in log files in the git-annex
     branch. This is a dangerous environment variable; use with caution.
   * Fix a git-annex test failure when run on NFS due to NFS lock files
     preventing directory removal.
   * test: Avoid most situations involving failure to delete test
     directories, by forking a worker process and only deleting the test
     directory once it exits.
   * Disable http-client's default 30 second response timeout when HEADing
     an url to check if it exists. Some web servers take quite a long time
     to answer a HEAD request.
   * Added remote configuration settings annex-ignore-command and
     annex-sync-command, which are dynamic equivilants of the annex-ignore
     and annex-sync configurations.
   * Prevent spaces from being embedded in the name of new WORM keys,
     as that handing spaces in keys would complicate things like the
     external special remote protocol.
   * migrate: WORM keys containing spaces will be migrated to not contain
     spaces anymore.
   * External special remotes will refuse to operate on keys with spaces in
     their names. That has never worked correctly due to the design of the
     external special remote protocol. Display an error message suggesting
     migration.
   * Fix incorrect external special remote documentation, which said that
     the filename parameter to the TRANSFER command could not contain
     spaces. It can in fact contain spaces. Special remotes implementors
     that relied on that may need to fix bugs in their special remotes.
   * Fix the external special remotes git-annex-remote-ipfs,
     git-annex-remote-torrent and the example.sh template to correctly
     support filenames with spaces.
   * Windows: Win32 package has subsumed Win32-extras; update dependency."""]]