From b01c73aadc08ac1cb1855c38f74a1e995efea221 Mon Sep 17 00:00:00 2001
From: Roman Podoliaka <rpodolyaka@mirantis.com>
Date: Fri, 15 Nov 2013 15:21:56 +0200
Subject: [PATCH] Provide a way of determining init system used

dib-init-system script is installed into $PATH. Called
without arguments it will print the name of init system
used to stdout.

Additionally, set DIB_INIT_SYSTEM environment variable to
the init system used.

Tested on ubuntu+upstart, centos+upstart, fedora+systemd,
debian+sysv.

Closes-Bug: #1251610

Change-Id: I29668079091f6060dab66d8259890384d3bbd653
---
 elements/base/dib-init-system                  | 18 ++++++++++++++++++
 .../base/environment.d/10-dib-init-system.bash |  1 +
 elements/base/pre-install.d/04-dib-init-system |  5 +++++
 3 files changed, 24 insertions(+)
 create mode 100755 elements/base/dib-init-system
 create mode 100644 elements/base/environment.d/10-dib-init-system.bash
 create mode 100755 elements/base/pre-install.d/04-dib-init-system

diff --git a/elements/base/dib-init-system b/elements/base/dib-init-system
new file mode 100755
index 00000000..88cf5fae
--- /dev/null
+++ b/elements/base/dib-init-system
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -eu
+
+if [ -f /sbin/initctl ]; then
+    echo "upstart"
+elif [ -f /usr/bin/systemctl ]; then
+    echo "systemd"
+elif [ -f /sbin/init ]; then
+    if [ -f /bin/systemd ]; then
+        echo "systemd"
+    else
+        echo "sysv"
+    fi
+else
+    echo "Unknown init system"
+    exit 1
+fi
diff --git a/elements/base/environment.d/10-dib-init-system.bash b/elements/base/environment.d/10-dib-init-system.bash
new file mode 100644
index 00000000..f264a23a
--- /dev/null
+++ b/elements/base/environment.d/10-dib-init-system.bash
@@ -0,0 +1 @@
+export DIB_INIT_SYSTEM=$(dib-init-system)
diff --git a/elements/base/pre-install.d/04-dib-init-system b/elements/base/pre-install.d/04-dib-init-system
new file mode 100755
index 00000000..54ea2587
--- /dev/null
+++ b/elements/base/pre-install.d/04-dib-init-system
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -e
+
+install -m 0755 -o root -g root $(dirname $0)/../dib-init-system /usr/bin/