Merge pull request #161 from aacole/check-fs-writable

adding check-fs-writable.sh

sensu/plugins/check-fs-writable.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# checks that all mounts listed in fstab are writeable
+
+mount_status=0
+
+for mount in $( findmnt -sno target | grep -v none ); do
+  file="${mount}/.tmp-writable-check"
+  trap '[[ -f "${file}" ]] && rm "${file}"' TERM EXIT
+
+  if ! touch "$file" 2>/dev/null; then
+    echo "FAIL - Could not create a file into '${mount}' !"
+    ((mount_status++))
+  fi
+done
+
+if [[ $mount_status == 0 ]]; then
+  echo "OK - all fstab mounts are writable"
+  exit 0
+else
+  echo "CRITICAL - '${mount_status}' mount(s) failing to write data"
+  exit 2
+fi