From 2abcafd670ee9d0e69b4abe424b6edb4aeea0924 Mon Sep 17 00:00:00 2001
From: Joshua Tauberer <jt@occams.info>
Date: Sat, 8 Jan 2022 19:09:11 -0500
Subject: [PATCH] Update Ubuntu version checks from 18.04 to 22.04

---
 setup/bootstrap.sh | 41 +++++++++++++++++++++++------------------
 setup/preflight.sh |  8 ++++----
 2 files changed, 27 insertions(+), 22 deletions(-)

diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index 4ba0cee7..cc4c060e 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -9,32 +9,37 @@
 if [ -z "$TAG" ]; then
 	# If a version to install isn't explicitly given as an environment
 	# variable, then install the latest version. But the latest version
-	# depends on the operating system. Existing Ubuntu 14.04 users need
-	# to be able to upgrade to the latest version supporting Ubuntu 14.04,
-	# in part because an upgrade is required before jumping to Ubuntu 18.04.
-	# New users on Ubuntu 18.04 need to get the latest version number too.
+	# depends on the machine's version of Ubuntu. Existing users need to
+	# be able to upgrade to the latest version available for that version
+	# of Ubuntu to satisfy the migration requirements.
 	#
 	# Also, the system status checks read this script for TAG = (without the
 	# space, but if we put it in a comment it would confuse the status checks!)
 	# to get the latest version, so the first such line must be the one that we
 	# want to display in status checks.
-	if [ "$(lsb_release -d | sed 's/.*:\s*//' | sed 's/18\.04\.[0-9]/18.04/' )" == "Ubuntu 18.04 LTS" ]; then
-		# This machine is running Ubuntu 18.04.
+	#
+	# Allow point-release versions of the major releases, e.g. 22.04.1 is OK.
+	UBUNTU_VERSION=$( lsb_release -d | sed 's/.*:\s*//' | sed 's/\([0-9]*\.[0-9]*\)\.[0-9]/\1/' )"
+	if [ "$UBUNTU_VERSION" == "Ubuntu 22.04 LTS" ]; then
+		# This machine is running Ubuntu 22.04, which is supported by
+		# Mail-in-a-Box versions 60 and later.
+		TAG=v60
+	elif [ "$UBUNTU_VERSION" == "Ubuntu 18.04 LTS" ]; then
+		# This machine is running Ubuntu 18.04, which is supported by
+		# Mail-in-a-Box versions 0.40 through 5x.
+		echo "Support is ending for Ubuntu 18.04."
+		echo "Please immediately begin to migrate your data to"
+		echo "a new machine running Ubuntu 22.04. See:"
+		echo "https://mailinabox.email/maintenance.html#upgrade"
 		TAG=v57a
-
-	elif [ "$(lsb_release -d | sed 's/.*:\s*//' | sed 's/14\.04\.[0-9]/14.04/' )" == "Ubuntu 14.04 LTS" ]; then
-		# This machine is running Ubuntu 14.04.
-		echo "You are installing the last version of Mail-in-a-Box that will"
-		echo "support Ubuntu 14.04. If this is a new installation of Mail-in-a-Box,"
-		echo "stop now and switch to a machine running Ubuntu 18.04. If you are"
-		echo "upgrading an existing Mail-in-a-Box --- great. After upgrading this"
-		echo "box, please visit https://mailinabox.email for notes on how to upgrade"
-		echo "to Ubuntu 18.04."
-		echo ""
+	elif [ "$UBUNTU_VERSION" == "Ubuntu 14.04 LTS" ]; then
+		# This machine is running Ubuntu 14.04, which is supported by
+		# Mail-in-a-Box versions 1 through v0.30.
+		echo "Ubuntu 14.04 is no longer supported."
+		echo "The last version of Mail-in-a-Box supporting Ubuntu 14.04 will be installed."
 		TAG=v0.30
-
 	else
-		echo "This script must be run on a system running Ubuntu 18.04 or Ubuntu 14.04."
+		echo "This script may be used only on a machine running Ubuntu 14.04, 18.04, or 22.04."
 		exit 1
 	fi
 fi
diff --git a/setup/preflight.sh b/setup/preflight.sh
index 9d2715c5..bd6d65b7 100644
--- a/setup/preflight.sh
+++ b/setup/preflight.sh
@@ -7,11 +7,11 @@ if [[ $EUID -ne 0 ]]; then
 	exit 1
 fi
 
-# Check that we are running on Ubuntu 18.04 LTS (or 18.04.xx).
-if [ "$(lsb_release -d | sed 's/.*:\s*//' | sed 's/18\.04\.[0-9]/18.04/' )" != "Ubuntu 18.04 LTS" ]; then
-	echo "Mail-in-a-Box only supports being installed on Ubuntu 18.04, sorry. You are running:"
+# Check that we are running on Ubuntu 20.04 LTS (or 20.04.xx).
+if [ "$( lsb_release --id --short )" != "Ubuntu" ] || [ "$( lsb_release --release --short )" != "22.04" ]; then
+	echo "Mail-in-a-Box only supports being installed on Ubuntu 22.04, sorry. You are running:"
 	echo
-	lsb_release -d | sed 's/.*:\s*//'
+	lsb_release --description --short
 	echo
 	echo "We can't write scripts that run on every possible setup, sorry."
 	exit 1