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.

Signed-off-by: Panagiotis Tamtamis <panagiotis.tamtamis@unify.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/meta/classes/rootfs-postcommands.bbclass b/meta/classes/rootfs-postcommands.bbclass
index 498174a664c251feb8c3285a39748d46b7ce751f..1d66a42953d614d5ddcbb76b921947e85f203a55 100644 (file)
--- 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