Update chroot for chromite if needed.

enter_chroot.sh

Index: enter_chroot.sh
diff --git a/enter_chroot.sh b/enter_chroot.sh
index 82bd39b1653d5da470ae551754d131816ffe055b..8e3d5898ece2f8ff028146784b5f1ad7b116d774 100755
--- a/enter_chroot.sh
+++ b/enter_chroot.sh
@@ -302,6 +302,37 @@ function teardown_env {
   ) 200>>"$LOCKFILE" || die "teardown_env failed"
 }
 
+# This function does extra "fixups" of the chroot.  It's a lot like
+# chroot_hacks_from_outside() in common.sh, except that it is only called
+# from enter_chroot.sh (chroot_hacks_from_outside is also called from
+# make_chroot.sh).  This function was created because common.sh is on lockdown
+# and can't be changed.
+#
+# NOTE: the need for this type of "fixup" should be going away.  If everything
+# in the chroot is versioned and nothing is generated, there is no need to
+# handle partly fixing up generated files.
+#
+# Please put date information so it's easy to keep track of when
+# old hacks can be retired and so that people can detect when a
+# hack triggered when it shouldn't have.
+function chroot_hacks_too() {
+  local chroot_home="${FLAGS_chroot}/home/${USER}"
+
+  # Add chromite stuff if not already done.
+  if ! grep -q "^PATH=.*/trunk/chromite/bin" "${chroot_home}/.bashrc"; then
+    info "Upgrading old chroot (pre 2011-02-09) - adding chromite to path"
+    echo "PATH=\$PATH:/home/${USER}/trunk/chromite/bin" >> \
+      "${chroot_home}/.bashrc"
+  fi
+  if ! [ -L "${chroot_home}/.local/lib/python2.6/site-packages/chromite" ]; then
+    info "Upgrading old chroot (pre 2011-02-09) - add chromite to site-packages"
+    mkdir -p "${chroot_home}/.local/lib/python2.6/site-packages"
+    ln -s ../../../../trunk/chromite \
+      "${chroot_home}/.local/lib/python2.6/site-packages/"
+  fi
+}
+
+
 if [ $FLAGS_mount -eq $FLAGS_TRUE ]; then
   setup_env
   info "Make sure you run"
@@ -318,6 +349,7 @@ fi
 
 # Apply any hacks needed to update the chroot.
 chroot_hacks_from_outside "${FLAGS_chroot}"
+chroot_hacks_too
 
 
 # Make sure we unmount before exiting