From 44ba06264f802128110d6ee388d4e7dbcd46a918 Mon Sep 17 00:00:00 2001
From: "Paul J. Davis" <paul.joseph.davis@gmail.com>
Date: Tue, 11 Oct 2011 22:06:58 -0500
Subject: Add a remsh command to BigCouch

The remsh pattern is quite useful for connecting to running nodes for
debugging production issues. This adds a small script that lets users
connect quickly to a running node.
---
 rel/overlay/bin/remsh | 41 +++++++++++++++++++++++++++++++++++++++++
 rel/reltool.config    |  1 +
 2 files changed, 42 insertions(+)
 create mode 100755 rel/overlay/bin/remsh

(limited to 'rel')

diff --git a/rel/overlay/bin/remsh b/rel/overlay/bin/remsh
new file mode 100755
index 00000000..d6028b42
--- /dev/null
+++ b/rel/overlay/bin/remsh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+if test ! $1 ; then
+    echo "usage: $0 nodename"
+    exit 1
+fi
+
+if test `echo $1 | sed 's/[^@]//g'`; then
+    NAME="-name $1"
+else
+    NAME="-sname $1"
+fi
+
+ERTS_BIN_DIR=$(cd ${0%/*} && pwd)
+ROOTDIR=${ERTS_BIN_DIR%/*}
+
+START_ERL=`cat $ROOTDIR/releases/start_erl.data`
+ERTS_VSN=${START_ERL% *}
+APP_VSN=${START_ERL#* }
+START_CLEAN="${ROOTDIR}/releases/${APP_VSN}/start_clean"
+
+BINDIR=$ROOTDIR/erts-$ERTS_VSN/bin
+
+REM_NODE="{{node_name}}"
+REM_NODE=${REM_NODE#* }
+
+COOKIE="-setcookie monster"
+
+exec $BINDIR/erl $NAME -remsh $REM_NODE $COOKIE -hidden -boot $START_CLEAN
diff --git a/rel/reltool.config b/rel/reltool.config
index d8403865..ccca5aed 100644
--- a/rel/reltool.config
+++ b/rel/reltool.config
@@ -57,6 +57,7 @@
     {copy, "overlay/share"},
     {copy, "../couchjs/build/couchjs", "bin/couchjs"},
     {copy, "../couchjs/build/main.js", "share/couchjs/main.js"},
+    {template, "overlay/bin/remsh", "bin/remsh"},
     {template, "overlay/etc/default.ini", "etc/default.ini"},
     {template, "overlay/etc/vm.args", "etc/vm.args"}
 ]}.
-- 
cgit v1.2.3


From d367c4bec22ad20807901c4b9c53b4fe4cd0fa59 Mon Sep 17 00:00:00 2001
From: "Paul J. Davis" <paul.joseph.davis@gmail.com>
Date: Wed, 12 Oct 2011 18:10:04 -0500
Subject: 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.
---
 rel/overlay/bin/remsh   | 20 +++++++++-----------
 rel/overlay/etc/vm.args | 13 +++++++++----
 2 files changed, 18 insertions(+), 15 deletions(-)

(limited to 'rel')

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
-- 
cgit v1.2.3