[cluster] Test the existence of the hosts' list

We now test if the hosts' list file exists before to work on it.

cluster/cluster-deploy.sh

@@ -94,6 +94,10 @@ HOSTS_LIST_NAME="$1"
 HOSTS="$HOME/.config/cluster/${HOSTS_LIST_NAME}.lst"
 shift
 echo "Using file '$HOSTS' as hosts' list."
+if [ ! -f "$HOSTS" ] ; then
+  echo "The hosts' list file doesn't exist or is not a regular file."
+  exit 3
+fi
 
 # Login
 if [ "$LOGIN" != "" ] ; then

cluster/cluster-ping.sh

@@ -10,13 +10,19 @@
 #
 # Ping a list of remote hosts using fping.
 
+# Check arguments
 if [ $# -ne 1 ] ; then
   echo "Usage: $0 <hosts_list>"
   exit 1
 fi
 
+# Hosts' list file
 HOSTS="$HOME/.config/cluster/$1.lst"
-shift
 echo "Using file '$HOSTS' as hosts' list."
+if [ ! -f "$HOSTS" ] ; then
+  echo "The hosts' list file doesn't exist or is not a regular file."
+  exit 2
+fi
 
+# Go!
 exec fping $(cat "$HOSTS") 2>/dev/null

cluster/cluster-run.sh

@@ -47,6 +47,10 @@ fi
 HOSTS="$HOME/.config/cluster/$1.lst"
 shift
 echo "Using file '$HOSTS' as hosts' list."
+if [ ! -f "$HOSTS" ] ; then
+  echo "The hosts' list file doesn't exist or is not a regular file."
+  exit 2
+fi
 
 # Login
 if [ "$LOGIN" != "" ] ; then

cluster/cluster-ssh.sh

@@ -38,6 +38,10 @@ fi
 HOSTS="$HOME/.config/cluster/$1.lst"
 shift
 echo "Using file '$HOSTS' as hosts' list."
+if [ ! -f "$HOSTS" ] ; then
+  echo "The hosts' list file doesn't exist or is not a regular file."
+  exit 2
+fi
 
 # Login
 if [ "$LOGIN" != "" ] ; then