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init: respect mount options in /etc/fstab for alpine_dev

ref #477
http://redmine.alpinelinux.org/issues/477

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -400,6 +400,15 @@

 	ALPINE_MNT="$new_mnt"

 fi

+# let user set ALPINE_MNT as readonly in fstab

+if [ -f $sysroot/etc/fstab ]; then

+	mountopts=$(awk "\$2 == \"$ALPINE_MNT\" { print \$4 }" \

+		$sysroot/etc/fstab)

+	if [ -n "$mountopts" ]; then

+		mount -o remount,$mountopts $ALPINE_MNT

+	fi

+fi

+

 # copy keys so apk finds them. apk looks for stuff relative --root

 mkdir -p $sysroot/etc/apk/keys/

 cp -a /etc/apk/keys $sysroot/etc/apk