From 4351e99efdc4e66b441e001b91c5b942c706331b Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Mon, 17 Jun 2019 14:15:30 -0400
Subject: ob_get_system_path(): Allow overriding DATADIR

---
diff --git a/NEWS b/NEWS
index 15f910c..6d52363 100644
--- a/NEWS
+++ b/NEWS
@@ -27,6 +27,8 @@ libopkbuild:
     ob_substvars() are now covered by the test suite.
   * ob_get_system_path() with the "platconf" path_id now accepts a
     single "plat" argument.  The three-argument form is now deprecated.
+  * ob_get_system_path() with the "buildflags" or "platconf" path_id now
+    accepts an "OB_TEST_DATADIR" to override the data directory prefix.
 
 [1]: https://reproducible-builds.org/specs/source-date-epoch/
 
diff --git a/lib/metadata.sh b/lib/metadata.sh
index 0597841..da3ff60 100644
--- a/lib/metadata.sh
+++ b/lib/metadata.sh
@@ -315,7 +315,10 @@ ob_plat_is_concerned()
 ##          \fIversion\fP.  For \fBbuildflags\fP the argument is \fI arch\fP. 
 ##          For \fBplatconf\fP they can be either only \fIplat\fP or all of
 ##          \fIsource\fP, \fIversion\fP, and \fIplat\fP; the latter form is
-##          deprecated.
+##          deprecated.  For \fBbuildflags\fP and \fBplatconf\fP, the system
+##          path will be under the value of the \fIOB_TEST_DATADIR\fP
+##          environment variable, if set and not null; this is intended for use
+##          in testing programs that call this function.
 ## @operand path_id req One of \fBpackage-source\fP, \fBpackage-docs\fP,
 ##                      \fBbuildflags\fP, or \fBplatconf\fP.
 ## @operand args    req Additional arguments specific to each \fIpath_id\fP.
diff --git a/lib/metadata/proteanos.sh b/lib/metadata/proteanos.sh
index f007c22..40d5d32 100644
--- a/lib/metadata/proteanos.sh
+++ b/lib/metadata/proteanos.sh
@@ -120,8 +120,15 @@ _ob_get_system_path()
 {
 	local path_id="${1}"
 	shift 1 || _ob_abort
+	local datadir=
 	local pkgver=
 
+	if [ x"${OB_TEST_DATADIR:+set}" = x'set' ]; then
+		datadir="${OB_TEST_DATADIR}"
+	else
+		datadir="${DATADIR}"
+	fi
+
 	case "${path_id}" in
 		'package-source')
 			# source version
@@ -136,19 +143,19 @@ _ob_get_system_path()
 		'buildflags')
 			# arch
 			[ ${#} -eq 1 ] || _ob_abort
-			printf '%s/opkbuild/buildflags/%s' "${DATADIR}" "${1}"
+			printf '%s/opkbuild/buildflags/%s' "${datadir}" "${1}"
 			;;
 		'platconf')
 			# [source version] plat
 			if [ ${#} -eq 1 ]; then
-				printf '%s/platconf/%s\n' "${DATADIR}" "${1}"
+				printf '%s/platconf/%s\n' "${datadir}" "${1}"
 				return 0
 			fi
 			[ ${#} -eq 3 ] || _ob_abort
 			# Deprecated:
 			ob_parse_version -u 'pkgver' -- "${2}"
-			printf '%s/platconf/%s/%s\n' "${DATADIR}" "${3}" "${1}"
-			printf '%s/platconf/%s/%s_%s\n' "${DATADIR}" \
+			printf '%s/platconf/%s/%s\n' "${datadir}" "${3}" "${1}"
+			printf '%s/platconf/%s/%s_%s\n' "${datadir}" \
 				"${3}" "${1}" "${pkgver}"
 			;;
 	esac
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