From 690963669cd8d760cab53cea45adfe39f3ca49c9 Mon Sep 17 00:00:00 2001
From: Ladar Levison <ladar@lavabit.com>
Date: Sat, 3 Aug 2019 20:59:41 +0530
Subject: [PATCH] Added fall through logic with error messages if OS is
 unrecognized.

This will print an error message but still exit with 0 if an
ephemeral hostname change was made, which seems more defenisve,
and user friendly to me.
---
 plugins/guests/alt/cap/change_host_name.rb | 26 ++++++++++++++--------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/plugins/guests/alt/cap/change_host_name.rb b/plugins/guests/alt/cap/change_host_name.rb
index 6b73d27ad..1991b29f2 100644
--- a/plugins/guests/alt/cap/change_host_name.rb
+++ b/plugins/guests/alt/cap/change_host_name.rb
@@ -16,13 +16,6 @@ module VagrantPlugins
               NEW_HOSTNAME_FULL='#{name}'
               NEW_HOSTNAME_SHORT="${NEW_HOSTNAME_FULL%%.*}"
 
-              # Update sysconfig
-              if [ -f /etc/sysconfig/network ]; then
-                sed -i 's/\\(HOSTNAME=\\).*/\\1#{name}/' /etc/sysconfig/network
-              elif [ -f /etc/hostname ]; then
-                sed -i 's/.*/#{name}/' /etc/hostname
-              fi
-
               # Set the hostname - use hostnamectl if available
               if command -v hostnamectl; then
                 hostnamectl set-hostname --static '#{name}'
@@ -39,12 +32,27 @@ module VagrantPlugins
                 sed -i -e "s/\(\s\)$CURRENT_HOSTNAME_SHORT\(\s\)/\1$NEW_HOSTNAME_SHORT\2/g" -e "s/\(\s\)$CURRENT_HOSTNAME_SHORT$/\1$NEW_HOSTNAME_SHORT/g" /etc/hosts
               fi
 
-              # Restart network
-              if command -v hostnamectl; then
+              # Persist hostname change across reboots
+              if [ -f /etc/sysconfig/network ]; then
+                sed -i 's/\\(HOSTNAME=\\).*/\\1#{name}/' /etc/sysconfig/network
+              elif [ -f /etc/hostname ]; then
+                sed -i 's/.*/#{name}/' /etc/hostname
+              else
+                echo 'Unrecognized system. Hostname change may not persist across reboots.'
+                exit 0
+              fi
+
+              # Restart the network if we find a recognized SYS V init script
+              if command -v service; then
                 if [ -f /etc/init.d/network ]; then
                   service network restart
                 elif [ -f /etc/init.d/networking ]; then
                   service networking restart
+                elif [ -f /etc/init.d/NetworkManager ]; then
+                  service NetworkManager restart
+                else
+                  echo 'Unrecognized system. Networking was not restarted following hostname change.'
+                  exit 0
                 fi
               fi