new: mount-ro check

sh/mount-ro-xinetd.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+# script for use with xinetd to monitor readonly filesystem
+#
+# xinetd config
+# service fsro
+#{
+#	disable = no
+#	flags = REUSE
+#	socket_type = stream
+#	type = UNLISTED
+#	port = 3333
+#	wait = no
+#	user = nobody
+#	server = /usr/local/sbin/mount-ro-xinetd.sh
+#	log_on_failure += USERID
+#	only_from = 127.0.0.0/8
+#}
+#
+
+function check_ok() {
+	MSG="$1 healthy"
+	LEN=$((${#MSG} + 2))
+        echo -en "HTTP/1.1 200 OK\r\n"
+        echo -en "Content-Type: text/plain\r\n"
+        echo -en "Connection: close\r\n"
+        echo -en "Content-Length: $LEN\r\n"
+        echo -en "\r\n"
+        echo -en "$MSG\r\n"
+        sleep 0.1
+        exit 0
+}
+
+function check_fail() {
+	MSG="$1"
+	LEN=$((${#MSG} + 2))
+        echo -en "HTTP/1.1 503 Service Unavailable\r\n"
+        echo -en "Content-Type: text/plain\r\n"
+        echo -en "Connection: close\r\n"
+        echo -en "Content-Length: $LEN\r\n"
+        echo -en "\r\n"
+        echo -en "$MSG\r\n"
+        sleep 0.1
+        exit 1
+}
+
+CHECK_PATH=/tmp
+grep -q $CHECK_PATH /proc/mounts || check_fail "Mount missing: $CHECK_PATH"
+dd if=/dev/urandom of=$CHECK_PATH/.test01 bs=1M count=10 status=none || check_fail "Write failed: $CHECK_PATH"
+dd if=$CHECK_PATH/.test01 of=/dev/null bs=1M status=none || check_fail "Read failed: $CHECK_PATH"
+check_ok "$CHECK_PATH"