[PATCH v9 12/14] rootfs: Fix possible overwrite of existing resolv.conf

[Vijai Kumar K <Vijaikumar_Kanagarajan@mentor.com>]

There is a possiblilty that one of the packages installed in the
rootfs provides /etc/resolv.conf and we might accidentally remove
it. Fix it by taking a backup of any existing resolv conf files
and restoring it later. This is needed since we could not effectively
move caching before rootfs_install_clean_files since we need the
latest dpkg log.

Signed-off-by: Vijai Kumar K <Vijaikumar_Kanagarajan@mentor.com>
---
 meta/classes/rootfs.bbclass | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index 9142f12..b6dc2c8 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -185,10 +185,18 @@ python do_rootfs_install() {
 addtask rootfs_install before do_rootfs_postprocess after do_unpack
 
 cache_deb_src() {
+    if [ -e "${ROOTFSDIR}"/etc/resolv.conf ]; then
+        sudo mv "${ROOTFSDIR}"/etc/resolv.conf "${ROOTFSDIR}"/etc/resolv.conf.isar
+    fi
     rootfs_install_resolvconf
+
     deb_dl_dir_import ${ROOTFSDIR} ${ROOTFS_DISTRO}
     debsrc_download ${ROOTFSDIR} ${ROOTFS_DISTRO}
-    rootfs_install_clean_files
+
+    sudo rm -f "${ROOTFSDIR}"/etc/resolv.conf
+    if [ -e "${ROOTFSDIR}"/etc/resolv.conf.isar ]; then
+        sudo mv "${ROOTFSDIR}"/etc/resolv.conf.isar "${ROOTFSDIR}"/etc/resolv.conf
+    fi
 }
 
 ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'clean-package-cache', 'rootfs_postprocess_clean_package_cache', '', d)}"
-- 
2.17.1