From 2e150d42e702fecd3b59eb97a708a53754db377b Mon Sep 17 00:00:00 2001
From: Luke Bakken <luke@bowbak.org>
Date: Wed, 24 Dec 2014 12:11:32 -0800
Subject: Use nodetool to get VM PID

Rather than use `ps`, `grep` and `awk` to get the `beam.smp` process id,
use the `os:getpid` function.

Also, provide a `pid` command to facilitate retrieving the VM's process
id at a later time. Useful for when running via `monit`, for instance.
---
 priv/templates/extended_bin.dtl | 28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/priv/templates/extended_bin.dtl b/priv/templates/extended_bin.dtl
index 751b01f..85030ac 100644
--- a/priv/templates/extended_bin.dtl
+++ b/priv/templates/extended_bin.dtl
@@ -26,6 +26,11 @@ find_erts_dir() {
     fi
 }
 
+# Get node pid
+relx_get_pid() {
+    relx_nodetool rpcterms os getpid | sed -e 's/"//g'
+}
+
 # Connect to a remote node
 relx_rem_sh() {
     # Generate a unique id used to allow multiple remsh to the same node
@@ -61,6 +66,7 @@ relx_escript() {
 
     "$ERTS_DIR/bin/escript" "$ROOTDIR/$scriptpath" $@
 }
+
 # Output a start command for the last argument of run_erl
 relx_start_command() {
     printf "exec \"%s\" \"%s\"" "$RELEASE_ROOT_DIR/bin/$REL_NAME" \
@@ -194,22 +200,7 @@ case "$1" in
 
     stop)
         # Wait for the node to completely stop...
-        case $(uname -s) in
-            Linux|Darwin|FreeBSD|DragonFly|NetBSD|OpenBSD)
-                # PID COMMAND
-                PID=$(ps ax -o pid= -o command=|
-                      grep "$RELEASE_ROOT_DIR/.*/[b]eam"|awk '{print $1}')
-                ;;
-            SunOS)
-                # PID COMMAND
-                PID=$(ps -ef -o pid= -o args=|
-                      grep "$RELEASE_ROOT_DIR/.*/[b]eam"|awk '{print $1}')
-                ;;
-            CYGWIN*)
-                # UID PID PPID TTY STIME COMMAND
-                PID=$(ps -efw|grep "$RELEASE_ROOT_DIR/.*/[b]eam"|awk '{print $2}')
-                ;;
-        esac
+        PID="$(relx_get_pid)"
         if ! relx_nodetool "stop"; then
             exit $?
         fi
@@ -233,6 +224,11 @@ case "$1" in
         fi
         ;;
 
+    pid)
+        ## Get the VM's pid
+        echo "$(relx_get_pid)"
+        ;;
+
     ping)
         ## See if the VM is alive
         if ! relx_nodetool "ping"; then
-- 
cgit v1.2.3