From 6544ba03a0cb6794354b4283bf9c04e0dffb4dfa Mon Sep 17 00:00:00 2001
From: Patrick Stadler <patrick.stadler@gmail.com>
Date: Sun, 29 Mar 2015 01:04:15 +0100
Subject: [PATCH] disk_io now checks if `iostat` is available. "done" is now
 always printed before exiting

---
 lib/main.sh        | 3 ++-
 metrics/disk_io.sh | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/main.sh b/lib/main.sh
index 7b5684b..11987f9 100644
--- a/lib/main.sh
+++ b/lib/main.sh
@@ -178,7 +178,8 @@ main_terminate () {
   if [ -d $TEMP_DIR ]; then
     rmdir $TEMP_DIR
   fi
-  verbose "done"
+
+  echo "done"
 }
 
 main_print_docs () {
diff --git a/metrics/disk_io.sh b/metrics/disk_io.sh
index cc5407e..3f4baf8 100644
--- a/metrics/disk_io.sh
+++ b/metrics/disk_io.sh
@@ -11,6 +11,11 @@ defaults () {
 }
 
 start () {
+  if ! command_exists iostat; then
+    echo "Warning: disk_io requires the command 'iostat' to be available"
+    return 1
+  fi
+
   readonly fifo=$TEMP_DIR/$(unique_id)_disk_io
   mkfifo $fifo