From 5e90de32f38363fab1a296a457173294c3e09127 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sun, 02 Sep 2018 20:01:45 -0400
Subject: configure.ac, config.sh.in: Check for tar

---
diff --git a/config.sh.in b/config.sh.in
index 1526b60..8d997a2 100644
--- a/config.sh.in
+++ b/config.sh.in
@@ -1,5 +1,6 @@
 PACKAGE='@PACKAGE@'
 PACKAGE_NAME='@PACKAGE_NAME@'
+TAR='@TAR@'
 MD5SUM='@MD5SUM@'
 SHA256SUM='@SHA256SUM@'
 GZIP='@GZIP@'
diff --git a/configure.ac b/configure.ac
index 1e92c9c..d1f9182 100644
--- a/configure.ac
+++ b/configure.ac
@@ -59,6 +59,37 @@ AC_ARG_WITH(
 )
 
 AC_ARG_WITH(
+	[tar],
+	[AS_HELP_STRING([--with-tar=PATH],
+		[path to tar utility with `-x', `-z', `-O', and `-f' options
+		(e.g. tar from GNU, BusyBox, or libarchive)])],
+	dnl This `dnl' is needed to workaround Vim syntax highlighting.
+	[
+		case "${withval}" in
+			'yes'|'')
+				AC_MSG_ERROR(
+					[--with-tar requires an argument])
+				;;
+			'no')
+				AC_MSG_ERROR([tar is required])
+				;;
+			*)
+				TAR="${withval}"
+				AC_SUBST([TAR])
+				;;
+		esac
+	],
+	[
+		AC_PATH_PROG([TAR], [tar])
+		if test -z "${TAR}"; then
+			AC_MSG_ERROR([tar not found])
+		fi
+	]
+)
+dnl TODO: Test ${TAR} for options support?  How can we do so without also
+dnl requiring -c support (missing from BusyBox tar without FEATURE_TAR_CREATE)
+dnl to create an archive for testing?
+AC_ARG_WITH(
 	[md5sum],
 	[AS_HELP_STRING([--with-md5sum=PATH], [path to md5sum utility])],
 	[
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