1 files changed, 46 insertions, 0 deletions
diff --git a/recipes-core/initrdscripts/initramfs-dm-verity/init-dm-verity.sh b/recipes-core/initrdscripts/initramfs-dm-verity/init-dm-verity.sh
new file mode 100644
index 0000000..307d2c7
--- /dev/null
+++ b/recipes-core/initrdscripts/initramfs-dm-verity/init-dm-verity.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+RDEV=""
+ROOT_DIR="/new_root"
+
+mkdir -p /proc
+mkdir -p /sys
+mkdir -p /run
+mkdir -p /tmp
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+mount -t devtmpfs none /dev
+
+udevd --daemon
+udevadm trigger --type=subsystems --action=add
+udevadm trigger --type=devices --action=add
+udevadm settle --timeout=10
+
+for PARAM in $(cat /proc/cmdline); do
+	case $PARAM in
+		root=*)
+			RDEV=${PARAM#root=}
+			;;
+	esac
+done
+
+if ! [ -b $RDEV ]; then
+	echo "Missing root command line argument!"
+	exit 1
+fi
+
+case $RDEV in
+	UUID=*)
+		RDEV=$(realpath /dev/disk/by-uuid/${RDEV#UUID=})
+		;;
+esac
+
+. /usr/share/dm-verity.env
+
+echo "Mounting $RDEV over dm-verity as the root filesystem"
+
+veritysetup --data-block-size=1024 --hash-offset=$DATA_SIZE create rootfs $RDEV $RDEV $ROOT_HASH
+mkdir -p $ROOT_DIR
+mount -o ro /dev/mapper/rootfs $ROOT_DIR
+exec switch_root $ROOT_DIR /sbin/init