[OE-core] [PATCH v3] rootfs-postcommands.bbclass: Check if "/etc/fstab" exists

[Panagiotis Tamtamis]

Using "read-only-rootfs" feature in minimal or special
purpose images (eg mounted images) makes build to fail
because ${IMAGE_ROOTFS}/etc/fstab file does not exist.

Signed-off-by: Panagiotis Tamtamis <panagiotis.tamtamis at unify.com>
---
 meta/classes/rootfs-postcommands.bbclass | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/meta/classes/rootfs-postcommands.bbclass b/meta/classes/rootfs-postcommands.bbclass
index 0c7ceea..9d9da02 100644
--- a/meta/classes/rootfs-postcommands.bbclass
+++ b/meta/classes/rootfs-postcommands.bbclass
@@ -64,7 +64,9 @@ systemd_create_users () {
 #
 read_only_rootfs_hook () {
 	# Tweak the mount option and fs_passno for rootfs in fstab
-	sed -i -e '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${IMAGE_ROOTFS}/etc/fstab
+	if [ -f ${IMAGE_ROOTFS}/etc/fstab ]; then
+		sed -i -e '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${IMAGE_ROOTFS}/etc/fstab
+	fi
 
 	# If we're using openssh and the /etc/ssh directory has no pre-generated keys,
 	# we should configure openssh to use the configuration file /etc/ssh/sshd_config_readonly
-- 
1.9.1