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authorEelco Dolstra <e.dolstra@tudelft.nl>2004-03-27T17·58+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2004-03-27T17·58+0000
commitf8cd904e05b95c5a3ca7cf570c0503a25a2095ca (patch)
tree4bf7f5ee3405578999b72cbae0729c4c8ed4a011 /src/libexpr
parentf0f7a9f29962c55a6c2082b44c9befbd912c2f53 (diff)
* Disallow the Nix store or any of its parents from being symlinks.
  This is because the contents of these symlinks are not incorporated
  into the hashes of derivations, and could therefore cause a mismatch
  between the build system and the target system.  E.g., if
  `/nix/store' is a symlink to `/data/nix/store', then a builder could
  expand this path and store the result.  If on the target system
  `/nix/store' is not a symlink, or is a symlink that points somewhere
  else, we have a dangling pointer.

  The trigger for this change is that gcc 3.3.3 does exactly that (it
  applies realpath() to some files, such as libraries, which causes
  our impurity checker to bail out.)

  An annoying side-effect of this change is that it makes it harder to
  move the Nix store to a different file system.  On Linux, bind
  mounts can be used instead of symlink for this purpose (e.g., `mount
  -o bind /data/nix/store /nix/store').

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