From b1d7abc7ad5d6ba5f2c1384e018aa86ced83c9f1 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Wed, 05 Jun 2019 19:08:50 -0400
Subject: build: Add tzdata target commands

---
diff --git a/build b/build
index 1aa0ac3..2343dbd 100755
--- a/build
+++ b/build
@@ -1,10 +1,26 @@
 #!/usr/bin/make -f
 
+tables = \
+	africa \
+	antarctica \
+	asia \
+	australasia \
+	europe \
+	northamerica \
+	southamerica \
+	etcetera \
+	factory
+
 nop:
 	@:
 
 build:
 	oh-autobuild -- KSHELL=/bin/sh TZDIR=/usr/share/zoneinfo
+	for t in $(tables); do \
+		/usr/sbin/zic -d tzdata-$${t}.data/usr/share/zoneinfo \
+			-L /dev/null -y yearistype.sh \
+			src/$${t} || exit $?; \
+	done
 	touch $@
 
 install: build
@@ -15,3 +31,59 @@ install: build
 	oh-fixperms
 	oh-strip
 	oh-installfiles
+	# Install tzdata files.
+	mkdir -p tzdata.data/usr/share/zoneinfo/Etc
+	mv tzdata-etcetera.data/usr/share/zoneinfo/Etc/UTC \
+		tzdata.data/usr/share/zoneinfo/Etc
+	cp src/iso3166.tab src/zone.tab tzdata.data/usr/share/zoneinfo
+	ln -sf Universal tzdata.data/usr/share/zoneinfo/posixrules
+	mkdir -p tzdata.data/etc
+	ln -sf /usr/share/zoneinfo/Universal tzdata.data/etc/localtime
+	ln -sf . tzdata.data/usr/share/zoneinfo/posix
+	# Install time zones.
+	for t in $(tables); do \
+		grep '^Link' src/$${t} | while read type dest src etc; do \
+			rm -f "tzdata-$${t}.data/usr/share/zoneinfo/$${src}"; \
+			if [ x"$${dest}" = x'Etc/UTC' ]; then \
+				p='tzdata'; \
+			else \
+				p="tzdata-$${t}"; \
+			fi; \
+			link="$${src}" up=''; \
+			while [ x"$${link#*/}" != x"$${link}" ] && \
+			      [ x"$${link%%/*}" = x"$${dest%%/*}" ]; do \
+				link="$${link#*/}"; \
+				dest="$${dest#*/}"; \
+			done; \
+			while [ x"$${link#*/}" != x"$${link}" ]; do \
+				link="$${link#*/}"; \
+				up="../$${up}"; \
+			done; \
+			src="$${p}.data/usr/share/zoneinfo/$${src}"; \
+			ln -sf "$${up}$${dest}" "$${src}"; \
+		done; \
+	done
+	# Install links listed in the "backward" table into the relevant time
+	# zone data package.
+	grep '^Link' src/backward | while read type dest src etc; do \
+		if [ x"$${dest}" = x'Etc/UTC' ]; then \
+			p='tzdata'; \
+		else \
+			p="tzdata-$$(cd src &&  grep -l \
+				"^Zone[ 	][ 	]*$${dest}[ 	].*$$" \
+				$(tables))"; \
+		fi; \
+		link="$${src}" up=''; \
+		while [ x"$${link#*/}" != x"$${link}" ] && \
+		      [ x"$${link%%/*}" = x"$${dest%%/*}" ]; do \
+			link="$${link#*/}"; \
+			dest="$${dest#*/}"; \
+		done; \
+		while [ x"$${link#*/}" != x"$${link}" ]; do \
+			link="$${link#*/}"; \
+			up="../$${up}"; \
+		done; \
+		src="$${p}.data/usr/share/zoneinfo/$${src}"; \
+		mkdir -p "$${src%/*}"; \
+		ln -sf "$${up}$${dest}" "$${src}"; \
+	done
--
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