Add tests to help verify Links functionality for .../contrib/tzdata/backwards

MFC after:	1 month
MFC with:	r320702

etc/mtree/BSD.tests.dist

@@ -400,6 +400,8 @@
                 ..
             ..
         ..
+        zoneinfo
+        ..
     ..
     sys
         acl

share/zoneinfo/Makefile

@@ -131,4 +131,8 @@ afterinstall:
 		echo "Run tzsetup(8) manually to update /etc/localtime."; \
 	fi
 
+.if ${MK_TESTS} != "no"
+SUBDIR+=	tests
+.endif
+
 .include <bsd.prog.mk>

share/zoneinfo/tests/Makefile

@@ -0,0 +1,20 @@
+# $FreeBSD$
+
+.include <src.opts.mk>
+
+.PATH: ${SRCTOP}/contrib/tzdata
+
+PACKAGE=	tests
+
+FILESGROUPS+=	TESTFILES
+
+.if ${MK_ZONEINFO_OLD_TIMEZONES_SUPPORT} != "no"
+ATF_TESTS_SH+=	backward_test
+TESTFILES+=	backward
+.endif
+
+TESTFILES+=	zoneinfo_common.sh
+TESTFILESPACKAGE= ${PACKAGE}
+TESTFILESDIR=	${TESTSDIR}
+
+.include <bsd.test.mk>

share/zoneinfo/tests/backward_test.sh

@@ -0,0 +1,44 @@
+#
+# Copyright (c) 2017 Ngie Cooper <ngie@FreeBSD.org>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+
+atf_test_case links
+links_head()
+{
+	atf_set "descr" "Verify Links directives in contrib/tzdata/backward"
+}
+
+links_body()
+{
+	verify_Links $(atf_get_srcdir)/backward
+}
+
+atf_init_test_cases()
+{
+	. "$(dirname "$0")/zoneinfo_common.sh"
+
+	atf_add_test_case links
+}

share/zoneinfo/tests/zoneinfo_common.sh

@@ -0,0 +1,54 @@
+#!/bin/sh
+#
+# Copyright (c) 2017 Ngie Cooper <ngie@FreeBSD.org>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+
+ZONEINFO_DIR=/usr/share/zoneinfo
+
+verify_Links()
+{
+	local zoneinfo_file
+
+	zoneinfo_file=$1
+
+	awk '$1 == "Link" && NF == 3 { print $2, $3; }' < $zoneinfo_file | \
+	while read src dest; do
+		verify_Link $src $dest
+	done
+}
+
+verify_Link()
+{
+	local src dest
+
+	old_path=$ZONEINFO_DIR/$src
+	new_path=$ZONEINFO_DIR/$dest
+
+	atf_check test -f $new_path
+	atf_check test -f $old_path
+
+	atf_check cmp $old_path $new_path
+}