[PATCH v2] Refresh /etc/resolv.conf on partial rebuilds

[Jan Kiszka <jan.kiszka@siemens.com>]

This addresses the scenario "mobile build host" where the resolv.conf as
once generated during bootstrap and then propagated into the
buildchroots as well the image rootfs may have become stale.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Changes in v2:
 - use "cp -L"

 meta/classes/buildchroot.bbclass           | 6 +++++-
 meta/classes/isar-bootstrap-helper.bbclass | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/meta/classes/buildchroot.bbclass b/meta/classes/buildchroot.bbclass
index 870d27c..34b7f59 100644
--- a/meta/classes/buildchroot.bbclass
+++ b/meta/classes/buildchroot.bbclass
@@ -29,5 +29,9 @@ buildchroot_do_mounts() {
             mount --bind ${DL_DIR} ${BUILDCHROOT_DIR}/downloads
             mount -t devtmpfs -o mode=0755,nosuid devtmpfs ${BUILDCHROOT_DIR}/dev
             mount -t proc none ${BUILDCHROOT_DIR}/proc
-        fi'
+        fi
+
+        # Refresh /etc/resolv.conf at this chance
+        cp -L /etc/resolv.conf ${BUILDCHROOT_DIR}/etc
+        '
 }
diff --git a/meta/classes/isar-bootstrap-helper.bbclass b/meta/classes/isar-bootstrap-helper.bbclass
index 1ac39db..e6a46ce 100644
--- a/meta/classes/isar-bootstrap-helper.bbclass
+++ b/meta/classes/isar-bootstrap-helper.bbclass
@@ -106,6 +106,9 @@ setup_root_file_system() {
     sudo mount -t devtmpfs -o mode=0755,nosuid devtmpfs $ROOTFSDIR/dev
     sudo mount -t proc none $ROOTFSDIR/proc
 
+    # Refresh /etc/resolv.conf
+    sudo cp -L /etc/resolv.conf ${ROOTFSDIR}/etc
+
     # Install packages:
     E="${@ bb.utils.export_proxies(d)}"
     export DEBIAN_FRONTEND=noninteractive
-- 
2.16.4