Add support of multiplexing ssh.

conf/rcopy.conf.sample

@@ -217,8 +217,7 @@ rm=`which rm`
 rsync=`which rsync`
 scp=`which scp`
 sgdisk=`which sgdisk`
-#ssh=`which ssh`
-ssh="`which ssh` -n"
+ssh=`which ssh`
 sort=`which sort`
 tar=`which tar`
 tune2fs=`which tune2fs`
@@ -230,6 +229,11 @@ sort=`which sort`
 sync=`which sync`
 touch=`which touch`
 
+ssh_opts='-o ControlMaster=auto -o ControlPath=/root/.ssh/%r@%h:%p -o ControlPersist=60'
+if [[ -n "$ssh" ]] ; then
+   ssh="$ssh -n $ssh_opts"
+fi
+
 export basename dirname awk cat cryptsetup cut date dd e2fsck find fdisk grep gzip hdparm logrotate mkdir mount mv parted ps rm rsync scp ssh sort tar tune2fs umount sfdisk sgdisk su sudo sort sync touch
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