fix(sys-apps/efunctions): Create functions.sh symlink in postinst.

This makes double sure that the symlink is never removed by INSTALL_MASK
or PKG_INSTALL_MASK. This symlink is so strictly required by random
tools we cannot allow it to ever go missing by mistake.

sdk_container/src/third_party/coreos-overlay/sys-apps/efunctions/efunctions-20130722_p1-r1.ebuild

@@ -0,0 +1,50 @@
+# Copyright 1999-2013 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+EAPI=5
+inherit vcs-snapshot
+
+# A longish note on versions because I will forget:
+# This ebuild fetches tarballs from github instead of using cros-workon
+# because having a system-level package using git clone to fetch sources
+# adds new ways for bootstrapping to fail. Also ${PN} needs to have a
+# one-to-one relationship with git commits to make mirroring/caching work.
+# - The version field is the date of the last upstream commit.
+# - Use patch (_p) instead of revision (-r) when updating the git hash.
+# So: 20130722_p1 includes upstream up through July with one CoreOS patch.
+
+DESCRIPTION="Stand-alone and portable version of Gentoo's functions.sh"
+HOMEPAGE="https://github.com/coreos/efunctions"
+GIT_COMMIT=9578f50fd0a87c6b8021025d70eb84297cbb15a0
+SRC_URI="${HOMEPAGE}/tarball/${GIT_COMMIT} -> ${P}.tar.gz"
+
+# FIXME(marineam): The origional functions.sh claims 2-clause BSD but
+# efunctions has no license declared. Assume it is unchanged until I
+# contact the author and get that sorted out...
+LICENSE="BSD-2"
+SLOT="0"
+KEYWORDS="amd64 x86"
+IUSE=""
+
+DEPEND=""
+RDEPEND="!sys-apps/openrc"
+
+src_install() {
+	local dst_dir=/usr/lib/${PN}
+
+	dodir $dst_dir
+	insinto $dst_dir
+	doins ${S}/functions.sh
+	doins -r ${S}/efunctions
+
+	fperms -R +x $dst_dir
+}
+
+pkg_postinst() {
+	local dst_dir=/usr/lib/${PN}
+
+	einfo "Creating /etc/init.d/functions.sh symlink..."
+	mkdir -p "${ROOT}"/etc/init.d
+	ln -sf ../..${dst_dir}/functions.sh "${ROOT}"/etc/init.d/functions.sh
+}