[PATCH v3 1/2] buildchroot+bootstrap: use rbinds for /dev and /proc

[Cedric Hombourger <Cedric_Hombourger@mentor.com>]

Bind mount the entire hierarchy for /dev and /proc as recommended in Gentoo's
chroot setup guide.

Suggested-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Cedric Hombourger <Cedric_Hombourger@mentor.com>
---
 meta/classes/buildchroot.bbclass                    | 6 ++++--
 meta/classes/isar-bootstrap-helper.bbclass          | 6 ++++--
 meta/recipes-core/isar-bootstrap/isar-bootstrap.inc | 6 ++++--
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/meta/classes/buildchroot.bbclass b/meta/classes/buildchroot.bbclass
index 870d27c..26d5e80 100644
--- a/meta/classes/buildchroot.bbclass
+++ b/meta/classes/buildchroot.bbclass
@@ -27,7 +27,9 @@ buildchroot_do_mounts() {
         if ! grep -q ${BUILDCHROOT_DIR}/isar-apt /proc/mounts; then
             mount --bind ${REPO_ISAR_DIR}/${DISTRO} ${BUILDCHROOT_DIR}/isar-apt
             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
+            mount --rbind /dev ${BUILDCHROOT_DIR}/dev
+            mount --make-rslave ${BUILDCHROOT_DIR}/dev
+            mount --rbind /proc ${BUILDCHROOT_DIR}/proc
+            mount --make-rslave ${BUILDCHROOT_DIR}/proc
         fi'
 }
diff --git a/meta/classes/isar-bootstrap-helper.bbclass b/meta/classes/isar-bootstrap-helper.bbclass
index 1ac39db..62c0839 100644
--- a/meta/classes/isar-bootstrap-helper.bbclass
+++ b/meta/classes/isar-bootstrap-helper.bbclass
@@ -103,8 +103,10 @@ setup_root_file_system() {
         sudo mount --bind ${REPO_BASE_DIR} ${ROOTFSDIR}/base-apt
     fi
 
-    sudo mount -t devtmpfs -o mode=0755,nosuid devtmpfs $ROOTFSDIR/dev
-    sudo mount -t proc none $ROOTFSDIR/proc
+    sudo mount --rbind /dev ${ROOTFSDIR}/dev
+    sudo mount --make-rslave ${ROOTFSDIR}/dev
+    sudo mount --rbind /proc ${ROOTFSDIR}/proc
+    sudo mount --make-rslave ${ROOTFSDIR}/proc
 
     # Install packages:
     E="${@ bb.utils.export_proxies(d)}"
diff --git a/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc b/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc
index 592d042..cd93f6c 100644
--- a/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc
+++ b/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc
@@ -241,8 +241,10 @@ isar_bootstrap() {
             "${ROOTFSDIR}/chroot-setup.sh" "setup" "${ROOTFSDIR}"
 
             # update APT
-            mount -t devtmpfs -o mode=0755,nosuid devtmpfs ${ROOTFSDIR}/dev
-            mount -t proc none ${ROOTFSDIR}/proc
+	    mount --rbind /dev ${BUILDCHROOT_DIR}/dev
+	    mount --make-rslave ${BUILDCHROOT_DIR}/dev
+	    mount --rbind /proc ${BUILDCHROOT_DIR}/proc
+	    mount --make-rslave ${BUILDCHROOT_DIR}/proc
 
             export DEBIAN_FRONTEND=noninteractive
             chroot "${ROOTFSDIR}" /usr/bin/apt-get update -y
-- 
2.11.0