From 06a1d9a641d29017679c37a017ffd092b364e280 Mon Sep 17 00:00:00 2001
From: Andrew Ruthven <andrew@etc.gen.nz>
Date: Mon, 17 Aug 2020 22:01:01 +1200
Subject: [PATCH] Handle /proc/cpuinfo not existing (#308)

I run rpi-update within a chroot on my NFS server for my diskless
Raspberry Pis, /proc/cpuinfo isn't in the chroot. This patch handles
that more gracefully.
---
 rpi-update | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/rpi-update b/rpi-update
index 2532270..8c19570 100755
--- a/rpi-update
+++ b/rpi-update
@@ -212,8 +212,12 @@ function check_eeprom_version {
 		return
 	fi
 
-	rev="$(sed -n '/^Revision/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo)"
-	if [ $(((0x$rev >> 23) & 1)) -ne 0 ] && [ $(((0x$rev >> 12) & 15)) -eq 3 ]; then
+	rev=
+	if [ -f /proc/cpuinfo ]; then
+		rev="$(sed -n '/^Revision/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo)"
+	fi
+
+	if [ -n $rev ] && [ $(((0x$rev >> 23) & 1)) -ne 0 ] && [ $(((0x$rev >> 12) & 15)) -eq 3 ]; then
 		HAVE_BOOTLOADER_EEPROM=1
 	fi