From e4169135e8fa6b9bce5dc25ab08c163588e32015 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@brickies.net>
Date: Wed, 12 Apr 2017 11:15:03 -0400
Subject: update-grub-legacy-ec2: fix early exit failure no /etc/fstab file.

If /etc/fstab did not exist, then update-grub-legacy-ec2 would fail.
That can cause upgrade or install of any kernel package to fail.

LP: #1682160
---
 debian/update-grub-legacy-ec2 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/debian/update-grub-legacy-ec2 b/debian/update-grub-legacy-ec2
index fc2e4e41..c1c9dc79 100755
--- a/debian/update-grub-legacy-ec2
+++ b/debian/update-grub-legacy-ec2
@@ -370,7 +370,10 @@ boot_device=$(find_device "/boot")
 device_map=$grub_dir/device.map
 
 # Default kernel options, overidden by the kopt statement in the menufile.
-loop_file=$(awk '$2=="/" && $4~"loop" {print $1}' /etc/fstab)
+loop_file=""
+if [ -f /etc/fstab ]; then
+   loop_file=$(awk '$2=="/" && $4~"loop" {print $1}' /etc/fstab)
+fi
 if [ -n "$loop_file" ]; then
 	dev_mountpoint=$(awk '"'${loop_file}'"~"^"$2 && $2!="/" {print $1";"$2}' /proc/mounts|tail -n 1)
 	host_device="${dev_mountpoint%;*}"
-- 
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