build system: detect if build host has no bzip2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

scripts/bb_release

@@ -17,7 +17,7 @@ VERSION=`ls busybox-*.tar.gz | sed 's/busybox-\(.*\)\.tar\.gz/\1/'`
 zcat busybox-$VERSION.tar.gz | bzip2 > busybox-$VERSION.tar.bz2
 
 for releasefile in busybox-$VERSION.tar.gz busybox-$VERSION.tar.bz2; do
-    test -f $releasefile || { echo "no $releasefile"; exit 1; }
-    gpg --detach-sign $releasefile
-    sha256sum $releasefile > $releasefile.sha256
+	test -f $releasefile || { echo "no $releasefile"; exit 1; }
+	gpg --detach-sign $releasefile
+	sha256sum $releasefile > $releasefile.sha256
 done

scripts/embedded_scripts

@@ -23,6 +23,12 @@ if test $? != 0; then
 	exit 1
 fi
 
+bzip2 </dev/null >/dev/null
+if test $? != 0; then
+	echo 'bzip2 is not installed'
+	exit 1
+fi
+
 custom_scripts=""
 if [ -d "$custom_loc" ]
 then

scripts/mkconfigs

@@ -28,6 +28,17 @@
 
 config=.config
 
+od -v -b </dev/null >/dev/null
+if test $? != 0; then
+	echo 'od tool is not installed or cannot accept "-v -b" options'
+	exit 1
+fi
+bzip2 </dev/null >/dev/null
+if test $? != 0; then
+	echo 'bzip2 is not installed'
+	exit 1
+fi
+
 {
 echo "\
 #ifndef _BBCONFIGOPTS_H