Add example init script

This was done in Bourne shell because it's easier for UNIX
sysadmins who don't know Ruby to understand and modify.
Additionally, it can be used for nginx or anything else
that shares compatible signal handling.

1 files changed, 54 insertions, 0 deletions

diff --git a/examples/init.sh b/examples/init.sh
new file mode 100644
index 0000000..866a644
--- /dev/null
+++ b/examples/init.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+set -u
+set -e
+# Example init script, this can be used with nginx, too,
+# since nginx and unicorn accept the same signals
+
+# Feel free to change any of the following variables for your app:
+APP_ROOT=/home/x/my_app/current
+PID=$APP_ROOT/tmp/pids/unicorn.pid
+CMD="/usr/bin/unicorn -D -c $APP_ROOT/config/unicorn.rb"
+INIT_CONF=$APP_ROOT/config/init.conf
+
+test -f "$INIT_CONF" && . $INIT_CONF
+
+old_pid="$PID.oldbin"
+
+cd $APP_ROOT || exit 1
+
+sig () {
+        test -s "$PID" && kill -$1 `cat $PID`
+}
+
+oldsig () {
+        test -s $old_pid && kill -$1 `cat $old_pid`
+}
+
+case $1 in
+start)
+        sig 0 && echo >&2 "Already running" && exit 0
+        $CMD
+        ;;
+stop)
+        sig QUIT && exit 0
+        echo >&2 "Not running"
+        ;;
+force-stop)
+        sig TERM && exit 0
+        echo >&2 "Not running"
+        ;;
+restart|reload)
+        sig HUP && echo reloaded OK && exit 0
+        echo >&2 "Couldn't reload, starting '$CMD' instead"
+        $CMD
+        ;;
+upgrade)
+        sig USR2 && sleep 2 && sig 0 && oldsig QUIT && exit 0
+        echo >&2 "Couldn't upgrade, starting '$CMD' instead"
+        $CMD
+        ;;
+*)
+        echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop>"
+        exit 1
+        ;;
+esac