From a7ab7c21761ca2242ddd43c8ce113ffa164e08a2 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Mon, 12 May 2014 23:14:50 -0400
Subject: ob-checkbuilddeps: Finally implement.

---
diff --git a/TODO b/TODO
index e9d9c43..0374dc1 100644
--- a/TODO
+++ b/TODO
@@ -26,7 +26,6 @@ Tasks:
     - Review "IFS=... cmd ..." commands.
       * "IFS=... read" is fine.
     - Review eval commands.
-  * Finish ob-checkbuilddeps.
   * See if ob-installdocs can/should handle non-directory non-regular files.
   * Write manual pages for functions and utilities.
 
diff --git a/locale/en_US/opkbuild.sh b/locale/en_US/opkbuild.sh
index 970fad9..f6a50d5 100644
--- a/locale/en_US/opkbuild.sh
+++ b/locale/en_US/opkbuild.sh
@@ -68,6 +68,7 @@ msg_opkbuild_host_arch_stat_header='Host system:'
 
 # ob-checkbuilddeps
 msg_opkbuild_checking_build_deps='Checking build dependencies...'
+msg_opkbuild_missing_build_deps='Missing build dependencies: %s'
 
 # ob-buildenv
 msg_opkbuild_setup_build_env='Setting up build environment...'
diff --git a/src/ob-checkbuilddeps.sh b/src/ob-checkbuilddeps.sh
index 53337dc..6d164b9 100644
--- a/src/ob-checkbuilddeps.sh
+++ b/src/ob-checkbuilddeps.sh
@@ -24,6 +24,7 @@
 ob_use locale
 ob_use output
 ob_use package
+ob_use deps
 
 main()
 {
@@ -32,7 +33,67 @@ main()
 	ob_init_package '..' || exit 1
 	ob_parse_package_metadata -c '.opkbuild.cache' || exit 1
 
+	check_build_deps
+	return ${?}
+}
+
+check_build_deps()
+{
+	local deps=
+	local missing=
+	local dep=
+
 	ob_info "$(ob_get_msg 'checking_build_deps')"
+
+	deps="$(ob_get_source_parameter 'Build-Depends')"
+	deps="$(ob_reduce_deps -a "${OPK_HOST_ARCH}" \
+		-P "${OPK_HOST_PLAT}" "${deps}")"
+	deps="$(ob_substvars "${deps}")"
+
+	missing=''
+	IFS=','
+	for dep in ${deps}; do
+		unset IFS
+		if ! dep="$(check_dep "${dep}")"; then
+			missing="${missing}, ${dep}"
+		fi
+	done
+	unset IFS
+
+	missing="${missing#, }"
+	if [ "x${missing}" != 'x' ]; then
+		ob_error "$(ob_get_msg 'missing_build_deps')" "${missing}"
+	fi
+
+	return 0
+}
+
+check_dep()
+{
+	local dep="${1}"
+	local dep_pkg=
+	local dep_rel=
+	local dep_ver=
+	local status=
+	local pkg_ver=
+
+	ob_parse_dep -p dep_pkg -r dep_rel -v dep_ver "${dep}"
+	status="$(opkg status "${dep_pkg}")"
+
+	if ! printf '%s\n' "${status}" | grep '^Status: .*ok installed$' \
+			>/dev/null 2>&1; then
+		return 1
+	fi
+	if [ "x${dep_rel}" != 'x' ]; then
+		pkg_ver="$(printf '%s\n' "${status}" | \
+			sed -n 's/^Version: //p')"
+		if opkg compare-versions "${pkg_ver}" "${dep_rel}" "${dep_ver}"
+		then
+			return 1
+		fi
+	fi
+
+	return 0
 }
 
 main "${@}"
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