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** Branch linked: lp:~gunnarhj/lightdm/lp-1482641

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https://bugs.launchpad.net/bugs/1482641

Title:
  Lightdm (and GDM) source .profile as bash, indirectly sourcing .bashrc

Status in gdm package in Ubuntu:
  In Progress
Status in lightdm package in Ubuntu:
  In Progress

Bug description:
  The fix for https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/678421
  leads to `.profile` being sourced by bash instead of dash. This leads
  `.bashrc` being sourced indirectly via .profile. IMHO, `.bashrc`
  should not be sourced even *once* in this situation. I suggest that
  sourcing .profile actually be done with BASH_VERSION unset:

      BASH_VERSION= . "$CONFIG"

  At the very least, a check should be done whether bash is the user's
  login shell. It can  be done thus:

      [ "$SHELL" != "/bin/bash" ] && BASH_VERSION=
      . "$CONFIG"

  utilizing `$SHELL` given it stores the login shell
  (http://unix.stackexchange.com/questions/45458/why-shell-doesnt-
  change-when-i-run-new-shell).

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