sys-apps/shadow: apply CoreOS changes

This just copies most of the previous ebuild's changes.  It drops
a bunch of redundant symlinks in /etc since tmpfiles creates them,
and it drops a passwd move out of /usr since our bindirs are linked
into /usr.

sdk_container/src/third_party/coreos-overlay/sys-apps/shadow/shadow-4.5.ebuild

@@ -3,7 +3,7 @@
 
 EAPI="5"
 
-inherit eutils libtool pam multilib
+inherit eutils libtool pam multilib systemd
 
 DESCRIPTION="Utilities to deal with user accounts"
 HOMEPAGE="https://github.com/shadow-maint/shadow http://pkg-shadow.alioth.debian.org/"
@@ -11,7 +11,7 @@ SRC_URI="https://github.com/shadow-maint/shadow/releases/download/${PV}/${P}.tar
 
 LICENSE="BSD GPL-2"
 SLOT="0"
-KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86"
+KEYWORDS="~alpha amd64 ~arm arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86"
 IUSE="acl audit cracklib nls pam selinux skey xattr"
 # Taken from the man/Makefile.am file.
 LANGS=( cs da de es fi fr hu id it ja ko pl pt_BR ru sv tr zh_CN zh_TW )
@@ -77,14 +77,14 @@ set_login_opt() {
 		comment="#"
 		sed -i \
 			-e "/^${opt}\>/s:^:#:" \
-			"${ED}"/etc/login.defs || die
+			"${ED}"/usr/share/shadow/login.defs || die
 	else
 		sed -i -r \
 			-e "/^#?${opt}\>/s:.*:${opt} ${val}:" \
-			"${ED}"/etc/login.defs
+			"${ED}"/usr/share/shadow/login.defs
 	fi
-	local res=$(grep "^${comment}${opt}\>" "${ED}"/etc/login.defs)
+	local res=$(grep "^${comment}${opt}\>" "${ED}"/usr/share/shadow/login.defs)
-	einfo "${res:-Unable to find ${opt} in /etc/login.defs}"
+	einfo "${res:-Unable to find ${opt} in /usr/share/shadow/login.defs}"
 }
 
 src_install() {
@@ -97,23 +97,39 @@ src_install() {
 	#   remove it.
 	rm -f "${ED}"/{,usr/}$(get_libdir)/lib{misc,shadow}.{a,la}
 
-	insinto /etc
+	# Remove files from /etc, they will be symlinks to /usr instead.
+	rm -f "${ED}"/etc/{limits,login.access,login.defs,securetty,default/useradd}
+
+	# CoreOS: break shadow.conf into two files so that we only have to apply
+	# etc-shadow.conf in the initrd.
+	systemd_dotmpfilesd "${FILESDIR}"/tmpfiles.d/etc-shadow.conf
+	systemd_dotmpfilesd "${FILESDIR}"/tmpfiles.d/var-shadow.conf
+
+	insinto /usr/share/shadow
+	# Using a securetty with devfs device names added
+	# (compat names kept for non-devfs compatibility)
+	insopts -m0600 ; doins "${FILESDIR}"/securetty
 	if ! use pam ; then
 		insopts -m0600
 		doins etc/login.access etc/limits
 	fi
+	# Output arch-specific cruft
+	local devs
+	case $(tc-arch) in
+		ppc*)  devs="hvc0 hvsi0 ttyPSC0";;
+		hppa)  devs="ttyB0";;
+		arm)   devs="ttyFB0 ttySAC0 ttySAC1 ttySAC2 ttySAC3 ttymxc0 ttymxc1 ttymxc2 ttymxc3 ttyO0 ttyO1 ttyO2";;
+		sh)    devs="ttySC0 ttySC1";;
+		amd64|x86)	devs="hvc0";;
+	esac
+	if [[ -n ${devs} ]]; then
+		printf '%s\n' ${devs} >> "${ED}"/usr/share/shadow/securetty
+	fi
 
 	# needed for 'useradd -D'
-	insinto /etc/default
 	insopts -m0600
 	doins "${FILESDIR}"/default/useradd
 
-	# move passwd to / to help recover broke systems #64441
-	mv "${ED}"/usr/bin/passwd "${ED}"/bin/ || die
-	dosym /bin/passwd /usr/bin/passwd
-
-	cd "${S}"
-	insinto /etc
 	insopts -m0644
 	newins etc/login.defs login.defs
 
@@ -166,7 +182,7 @@ src_install() {
 			-e 'b exit' \
 			-e ': pamnote; i# NOTE: This setting should be configured via /etc/pam.d/ and not in this file.' \
 			-e ': exit' \
-			"${ED}"/etc/login.defs || die
+			"${ED}"/usr/share/shadow/login.defs || die
 
 		# remove manpages that pam will install for us
 		# and/or don't apply when using pam
@@ -194,17 +210,3 @@ pkg_preinst() {
 	rm -f "${EROOT}"/etc/pam.d/system-auth.new \
 		"${EROOT}/etc/login.defs.new"
 }
-
-pkg_postinst() {
-	# Enable shadow groups.
-	if [ ! -f "${EROOT}"/etc/gshadow ] ; then
-		if grpck -r -R "${EROOT}" 2>/dev/null ; then
-			grpconv -R "${EROOT}"
-		else
-			ewarn "Running 'grpck' returned errors.  Please run it by hand, and then"
-			ewarn "run 'grpconv' afterwards!"
-		fi
-	fi
-
-	einfo "The 'adduser' symlink to 'useradd' has been dropped."
-}