From 7e663ebe5a876ad424729353e12ad9dd13590bfa Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Sun, 29 Jan 2012 18:38:24 -0500
Subject: Support target platforms and platform configs.

---
diff --git a/src/opkbuild b/src/opkbuild
index e9b1f3f..7c3c953 100644
--- a/src/opkbuild
+++ b/src/opkbuild
@@ -34,7 +34,7 @@ error()
 	exit 1
 }
 
-opts=$(getopt -n "${0}" -o 'r:' -- "${@}")
+opts=$(getopt -n "${0}" -o 'r:p:' -- "${@}")
 if [ ${?} -ne 0 ]; then
 	print_usage "${0}" >&2
 	exit 1;
@@ -46,6 +46,10 @@ while true; do
 			uid0_cmd=${2}
 			shift 2
 			;;
+		-p)
+			platform=${2}
+			shift 2
+			;;
 		--)
 			shift
 			break
@@ -77,6 +81,29 @@ if [ "$(cat format)" != '1.0' ]; then
 	exit 1
 fi
 
+# Attempt to detect the target platform.
+# If there no config files to copy, build platform-independent packages.
+if [ ! -f config ]; then
+	platform=''
+# If a target platform was not specified ...
+elif [ -z "${platform}" ]; then
+	platform=$(opkg print-architecture | \
+		grep '^arch [^-] [0-9][0-9]*')
+	# ... and there are config files and zero installable platforms, fail.
+	if [ -z "${platform}" ]; then
+		printf 'opkbuild: Error: %s\n' \
+			'Building platform-dependent package and no platforms detected' >&2
+		exit 1
+	# ... and there are config files and multiple installable platforms, request
+	# explicit selection.
+	elif [ $(echo "${platform}" | wc -l) -gt 1 ]; then
+		printf 'opkbuild: Error: %s\n' \
+			'Multiple platforms found while detecting target' >&2
+		exit 1
+	fi
+	# ... and there are config files and one installable platform, build for it.
+fi
+
 # Make work area.
 printf 'opkbuild: Making work area...\n'
 mkdir tmp
@@ -87,6 +114,12 @@ printf 'opkbuild: Reading source package control fields...\n'
 srcpkg=$(oh_get_field Source)
 version=$(oh_get_field Version)
 
+# Set environment variables for the build configuration.
+export OH_PLATFORM="${platform}"
+export OH_SRCPKG="${srcpkg}"
+export OH_PKGVER="${version%'-'*}"
+export OH_PKGREV="${version#*'-'}"
+
 # Check build dependencies.
 oh-checkbuilddeps || error "${srcpkg}-src"
 
@@ -117,6 +150,7 @@ printf 'opkbuild: Package "%s" complete!\n\n' "${srcpkg}-src"
 for binpkgdir in ../*.pkg/; do
 	binpkg=${binpkgdir#'../'}
 	binpkg=${binpkg%'.pkg/'}
+	export OH_BINPKG="${binpkg}"
 	# TODO: Check architecture.
 	if true; then
 		printf 'opkbuild: Attempting to build package "%s"...\n' "${binpkg}"
@@ -132,6 +166,8 @@ for binpkgdir in ../*.pkg/; do
 		# TODO: Other compression formats, putting things in src/, ...
 		# Apply patches.
 		oh-applypatches
+		# Copy platform config files.
+		oh-copyconfig || error "${binpkg}"
 		# Build the package.
 		${uid0_cmd} ../build ${binpkg} || error "${binpkg}"
 		printf 'opkbuild: Package "%s" complete!\n\n' "${binpkg}"
--
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