rootfs-postcommands.bbclass: Check if "/etc/fstab" exists

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.

(From OE-Core rev: 43714514fb29a40830e6619552980d7f88d77fb7)

Signed-off-by: Panagiotis Tamtamis <panagiotis.tamtamis@unify.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/meta/classes/rootfs-postcommands.bbclass b/meta/classes/rootfs-postcommands.bbclass
index 498174a664..1d66a42953 100644
--- a/meta/classes/rootfs-postcommands.bbclass
+++ b/meta/classes/rootfs-postcommands.bbclass
@@ -84,7 +84,9 @@ 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