Improve remsh script

Cookies now default to using ~/.erlang.cookie which is automatically
generated if it does not exist when erlang starts with a name.

There is also no longer a need to specify a name to remsh as it'll
generate a name based on the process id and set the short or long
version appropriately.

2 files changed, 18 insertions, 15 deletions

diff --git a/rel/overlay/bin/remsh b/rel/overlay/bin/remsh
index d6028b42..39955ae8 100755
--- a/rel/overlay/bin/remsh
+++ b/rel/overlay/bin/remsh
@@ -12,15 +12,16 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-if test ! $1 ; then
-    echo "usage: $0 nodename"
-    exit 1
-fi
+NAME="remsh$$"
+REM_NODE="{{node_name}}"
+NAME_TYPE=${REM_NODE% *}
+REM_NODE=${REM_NODE#* }
+HOST=`echo "$REM_NODE" | grep -o "@.*" | sed 's/@//'`
 
-if test `echo $1 | sed 's/[^@]//g'`; then
-    NAME="-name $1"
+if test -n $HOST; then
+    NAME="$NAME_TYPE $NAME@$HOST"
 else
-    NAME="-sname $1"
+    NAME="$NAME_TYPE $NAME"
 fi
 
 ERTS_BIN_DIR=$(cd ${0%/*} && pwd)
@@ -33,9 +34,6 @@ START_CLEAN="${ROOTDIR}/releases/${APP_VSN}/start_clean"
 
 BINDIR=$ROOTDIR/erts-$ERTS_VSN/bin
 
-REM_NODE="{{node_name}}"
-REM_NODE=${REM_NODE#* }
-
-COOKIE="-setcookie monster"
+COOKIE="{{cookie}}"
 
 exec $BINDIR/erl $NAME -remsh $REM_NODE $COOKIE -hidden -boot $START_CLEAN
diff --git a/rel/overlay/etc/vm.args b/rel/overlay/etc/vm.args
index bb143502..03e5af27 100644
--- a/rel/overlay/etc/vm.args
+++ b/rel/overlay/etc/vm.args
@@ -4,10 +4,15 @@
 # with the -name flag.
 {{node_name}}
 
-# All nodes must share the same magic cookie for distributed Erlang to work.
-# Comment out this line if you synchronized the cookies by other means (using
-# the ~/.erlang.cookie file, for example).
--setcookie monster
+# If you passed a value for the cookie to ./configure it will be set here.
+# Otherwise it will default to using ~/.erlang.cookie which will be generated
+# automatically if it doesn't exist.
+#
+# Note that you need to make sure that the cookie value used is synchronized
+# across all nodes in the cluster. This means that if you don't set the
+# cookie by hand you need to manually sync ~/.erlang.cookie across all nodes
+# in the cluster.
+{{cookie}}
 
 # Tell SASL not to log progress reports
 -sasl errlog_type error