qemu_multiarch_testing: small improvements

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

qemu_multiarch_testing/extract_uuencoded_binary.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+# Extract uuencoded and bzipped busybox binaries
+# from system-image-*.log files
+
+for logfile in system-image-*.log; do
+	grep -q '^begin 744 busybox.bz2' "$logfile" \
+	|| { echo "No busybox.bz2 in $logfile"; continue; }
+
+	arch=${logfile%.log}
+	arch=${arch#system-image-}
+
+	test -e "busybox-$arch" \
+	&& { echo "busybox-$arch exists, not overwriting"; continue; }
+
+	uudecode -o - "$logfile" | bunzip2 >"busybox-$arch" \
+	&& chmod 755 "busybox-$arch"
+done