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external/packages/raspi/scripts/dependencies_check

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+# dependencies_check
+# $@	Dependency files to check
+#
+# Each dependency is in the form of a tool to test for, optionally followed by
+# a : and the name of a package if the package on a Debian-ish system is not
+# named for the tool (i.e., qemu-user-static).
+dependencies_check()
+{
+	local depfile deps missing
+
+	for depfile in "$@"; do
+		if [[ -e "$depfile" ]]; then
+			deps="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < "${BASE_DIR}/depends")"
+
+		fi
+		for dep in $deps; do
+			if ! hash "${dep%:*}" 2>/dev/null; then
+				missing="${missing:+$missing }${dep#*:}"
+			fi
+		done
+	done
+
+	if [[ "$missing" ]]; then
+		echo "Required dependencies not installed"
+		echo
+		echo "This can be resolved on Debian/Raspbian systems by installing:"
+		echo "$missing"
+		false
+	fi
+
+    # If we're building on a native arm platform, we don't need to check for
+    # binfmt_misc or require it to be loaded.
+
+	binfmt_misc_required=1
+
+	case $(uname -m) in
+		aarch64)
+			binfmt_misc_required=0
+			;;
+		arm*)
+			binfmt_misc_required=0
+			;;
+	esac
+
+	if [[ "${binfmt_misc_required}" == "1" ]]; then
+		if ! grep -q "/proc/sys/fs/binfmt_misc" /proc/mounts; then
+			echo "Module binfmt_misc not loaded in host"
+			echo "Please run:"
+			echo "  sudo modprobe binfmt_misc"
+			exit 1
+		fi
+	fi
+}