Initial commit

poky/meta/files/overlayfs-etc-preinit.sh.in

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+echo "PREINIT: Start"
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+mount -o remount,rw /
+
+mkdir -p /proc
+mkdir -p /sys
+mkdir -p /run
+mkdir -p /var/run
+
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
+
+BASE_OVERLAY_ETC_DIR={OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc
+UPPER_DIR=$BASE_OVERLAY_ETC_DIR/upper
+WORK_DIR=$BASE_OVERLAY_ETC_DIR/work
+LOWER_DIR=$BASE_OVERLAY_ETC_DIR/lower
+
+mkdir -p {OVERLAYFS_ETC_MOUNT_POINT}
+if mount -n -t {OVERLAYFS_ETC_FSTYPE} \
+    -o {OVERLAYFS_ETC_MOUNT_OPTIONS} \
+    {OVERLAYFS_ETC_DEVICE} {OVERLAYFS_ETC_MOUNT_POINT}
+then
+    mkdir -p $UPPER_DIR
+    mkdir -p $WORK_DIR
+
+    if {OVERLAYFS_ETC_EXPOSE_LOWER}; then
+        mkdir -p $LOWER_DIR
+
+        # provide read-only access to original /etc content
+        mount -o bind,ro /etc $LOWER_DIR
+    fi
+
+    mount -n -t overlay \
+        -o upperdir=$UPPER_DIR \
+        -o lowerdir=/etc \
+        -o workdir=$WORK_DIR \
+        -o index=off,xino=off,redirect_dir=off,metacopy=off \
+        $UPPER_DIR /etc || \
+            echo "PREINIT: Mounting etc-overlay failed!"
+else
+    echo "PREINIT: Mounting </data> failed!"
+fi
+
+echo "PREINIT: done; starting </sbin/init>"
+exec {SBIN_INIT_NAME}