[gnome-continuous-yocto/gnomeostree-3.28-rocko: 5850/8267] rootfs-postcommands.bbclass: Check if "/etc/fstab" exists

[Emmanuele Bassi <ebassi src gnome org>]

commit 6830a969f27814b76c2cbab56b8957c532b76487
Author: Panagiotis Tamtamis <panagiotis tamtamis unify com>
Date:   Fri Apr 28 10:09:27 2017 +0300

    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>

 meta/classes/rootfs-postcommands.bbclass |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/meta/classes/rootfs-postcommands.bbclass b/meta/classes/rootfs-postcommands.bbclass
index 498174a..1d66a42 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