From 6a86c83f0c77deae3b9907b6f4e0e8718d2afd9f Mon Sep 17 00:00:00 2001
From: Patrick Spek <p.spek@tyil.nl>
Date: Wed, 3 Aug 2022 13:43:09 +0200
Subject: Add $BASHTARD_PLATFORM[init]

---
 lib/main.bash | 37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

(limited to 'lib/main.bash')

diff --git a/lib/main.bash b/lib/main.bash
index cf3e069..bbfd602 100644
--- a/lib/main.bash
+++ b/lib/main.bash
@@ -138,6 +138,7 @@ discover_system() {
 	BASHTARD_PLATFORM["version"]="$(discover_system_version)"
 	BASHTARD_PLATFORM["term"]="$TERM"
 	BASHTARD_PLATFORM["fqdn"]="$(hostname -f)"
+	BASHTARD_PLATFORM["init"]="$(discover_system_init)"
 
 	# When on a Linux-using OS, check for the specific distribution in use.
 	if [[ ${BASHTARD_PLATFORM[os]} == *"linux"* ]]
@@ -174,8 +175,36 @@ discover_system_distro() {
 	fi
 }
 
-discover_system_version() {
-	printf "%s" "$(uname -r | awk '{print tolower($0)}')"
+discover_system_init() {
+	local sbin_init
+
+	# Differing init systems seems to only be a thing on GNU+Linux
+	if [[ ${BASHTARD_PLATFORM["os"]} != "linux" ]]
+	then
+		return
+	fi
+
+	sbin_init="$(readlink -f "/sbin/init" | awk -F/ '{ print $NF }')"
+
+	# If /sbin/init is a symlink, it will point us towards the right thing
+	if [[ $sbin_init != "init" ]]
+	then
+		printf "%s" "$sbin_init"
+		return
+	fi
+
+	# Otherwise we try out /etc/inittab
+	if [[ -f "/etc/inittab" ]]
+	then
+		awk -F: '/^rc:/ { print $4 }' /etc/inittab \
+			| awk '{ print $1 }' \
+			| awk -F/ '{ print $NF }'
+
+		return
+	fi
+
+	# If we can't figure it out, show a warning
+	warn "$BASHTARD_NAME/util" "Can't figure out system init"
 }
 
 discover_system_key() {
@@ -199,4 +228,8 @@ discover_system_os() {
 	fi
 }
 
+discover_system_version() {
+	printf "%s" "$(uname -r | awk '{print tolower($0)}')"
+}
+
 main "$@"
-- 
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