From a773054924b88be86d0618a4eba812e759c03f2f Mon Sep 17 00:00:00 2001
From: Dimitri John Ledkov <xnox@ubuntu.com>
Date: Fri, 30 Sep 2016 15:50:47 +0100
Subject: [PATCH] Revert "Allow btrfs /boot partition. This is supported by
 grub2 and lilo."

This reverts commit 841f8b754c5576f941c82bb59c78a6229059f05f.
---
 check.d/_numbers               |  1 +
 check.d/no_btrfs_boot          | 32 ++++++++++++++++++++++++++++++++
 debian/partman-btrfs.templates | 18 ++++++++++++++++++
 3 files changed, 51 insertions(+)
 create mode 100755 check.d/no_btrfs_boot

diff --git a/check.d/_numbers b/check.d/_numbers
index c45e2be..710d9fa 100644
--- a/check.d/_numbers
+++ b/check.d/_numbers
@@ -1 +1,2 @@
 09 nomountpoint_btrfs
+05 no_btrfs_boot
diff --git a/check.d/no_btrfs_boot b/check.d/no_btrfs_boot
new file mode 100755
index 0000000..ef9c180
--- /dev/null
+++ b/check.d/no_btrfs_boot
@@ -0,0 +1,32 @@
+#!/bin/sh
+# grub and other bootloaders that read the filesystem do not support /boot
+# on btrfs. (lilo should work). Detect and warn.
+
+. /lib/partman/lib/base.sh
+
+get_btrfs_root_boot () {
+	(for i in /lib/partman/fstab.d/*; do
+		[ -x "$i" ] || continue
+		$i
+	done) |
+	while read fs mp type options dump pass; do
+		if [ "$mp" = / ]; then
+			echo root_type=$type
+		elif [ "$mp" = /boot ]; then
+			echo boot_type=$type
+		fi
+	done
+}
+eval "$(get_btrfs_root_boot)"
+
+if [ "$boot_type" = btrfs ]; then
+	db_input critical partman-btrfs/btrfs_boot || true
+	db_go || exit 1
+	exit 1
+fi
+
+if [ "$boot_type" = "" ] && [ "$root_type" = btrfs ]; then
+	db_input critical partman-btrfs/btrfs_root || true
+	db_go || exit 1
+	exit 1
+fi
diff --git a/debian/partman-btrfs.templates b/debian/partman-btrfs.templates
index 6f1227d..ce178ad 100644
--- a/debian/partman-btrfs.templates
+++ b/debian/partman-btrfs.templates
@@ -15,3 +15,21 @@ Type: text
 # :sl1:
 # Short file system name (untranslatable in many languages)
 _Description: btrfs
+
+Template: partman-btrfs/btrfs_root
+Type: error
+# :sl2:
+_Description: btrfs root file system not supported without separate /boot
+ Your root file system is a btrfs file system. This is not supported
+ by the boot loader used by default by this installer.
+ .
+ You should use a small /boot partition with another file system, such as ext3.
+
+Template: partman-btrfs/btrfs_boot
+Type: error
+# :sl2:
+_Description: btrfs file system not supported for /boot
+ You have mounted a btrfs file system as /boot. This is not supported
+ by the boot loader used by default by this installer.
+ .
+ You should use another file system, such as ext3, for the /boot partition.