Merge ~ubuntu-core-dev/grub/+git/ubuntu:wip/postinst-check into ~ubuntu-core-dev/grub/+git/ubuntu:focal

[Dimitri John Ledkov]

grub-pc/postinst: fail noninteractive installation if devices failed to install

Unmerged commits

f5399ac... by Dimitri John Ledkov on 2020-07-30

grub-pc/postinst: fail noninteractive installation if devices failed to install

When upgrading non-interactively, and grub-pc installation fails on to
the configured devices fail the package configuration.

This will generate apport crash report and signal that one may fail to
reboot due to potential missmatch between core and modules..

LP: #1889556

diff --git a/debian/postinst.in b/debian/postinst.in
index 4e1dafa..d0e68ae 100644
--- a/debian/postinst.in
+++ b/debian/postinst.in
@@ -658,7 +658,7 @@ case "$1" in
                     continue
                   fi
                 else
-                  break # noninteractive
+                  exit 1 # noninteractive
                 fi
               fi
             fi