update hooks: migrate paths to userpriv settings

Now that we're enabling userpriv for the chroot, we need to fix all the
paths that might be owned by root to the right user.

BUG=chromium-os:3616
TEST=`./update_chroot` on a system with root-owned files
	in the various paths changed them all to my user

Change-Id: I3655c851d5844524ec77c3476cee7a6e9d70ce0d
CQ-DEPEND=Id513c0b8b380d57dd3e150917a969d0bf36883fc
Reviewed-on: https://gerrit.chromium.org/gerrit/24216
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>

chroot_version_hooks.d/38_host_userpriv

@@ -0,0 +1,17 @@
+# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Migrate to userpriv for building things.  We need to clean out old
+# dirs that might have files owned by root:root.
+
+eval $(portageq envvar -v PORTAGE_{TMPDIR,USERNAME,GRPNAME} DISTDIR PKGDIR)
+: ${PORTAGE_TMPDIR:=/var/tmp/portage}
+: ${PORTAGE_USERNAME:=${USER}}
+: ${PORTAGE_GRPNAME:=portage}
+: ${DISTDIR:=/var/cache/distfiles/host}
+: ${PKGDIR:=/var/lib/portage/pkgs}
+
+exec sudo find "${PORTAGE_TMPDIR}" "${DISTDIR}" "${PKGDIR}" \
+  '(' -uid 0 -o -gid 0 ')' \
+  -exec chown -h "${PORTAGE_USERNAME}:${PORTAGE_GRPNAME}" {} +