I think what should happen is that instead of using realpath(3), schroot
needs to use readlink(2) and then append the result of that to the base
chroot path and then attempt to call readlink(2) on that path. That
would result in symlinks only being resolved inside of the chroot
instead of having a symlink that can point to outside of the chroot.

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https://bugs.launchpad.net/bugs/1438942

Title:
  Host's /dev/shm is mounted over when entering 14.10 and older sbuild
  schroots

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