Scripts to expose the Trussed store via FUSE

.gitignore

@@ -6,3 +6,4 @@ solo-bee.code-workspace
 ref/
 memory.x
 solo-state.bin
+bee.littlefs2

Makefile

@@ -8,3 +8,8 @@ bacon:
 run-dev:
 	make -C $(RUNNER) run-dev
 
+mount-fs:
+	scripts/fuse-bee
+
+umount-fs:
+	scripts/defuse-bee

scripts/defuse-bee

@@ -0,0 +1,10 @@
+#!/usr/bin/bash -xe
+
+# load variable
+state=/tmp/bee-mount.state
+source ${state}
+
+# unmount
+umount ${mount}
+sudo losetup -d ${loop_device}
+rm ${state}

scripts/fuse-bee

@@ -0,0 +1,49 @@
+#!/usr/bin/bash -xe
+
+# Prerequisites:
+#
+# - lpc55: install via `cargo install lpc55-host`
+# - lfs: install via `yay -S littlefs2-fuse`
+# - the bee needs to be in ROM bootloader
+# - the mountpoint has to exist
+
+fs=./bee.littlefs2
+fs_offset=$((512 * 1024))  #  512K, start of 3rd PRINCE section
+expected_fs_size=$((239 * 512))  # 119.5K, or 239 flash pages
+mount=/mnt/bee
+state=/tmp/bee-mount.state
+
+# check no previous mount
+if test -f $state; then
+	set +x
+	echo
+	echo "File ${state} exists, this may indicate a mount already exists."
+	echo "Clean up (scripts/defuse-bee), then try again."
+	echo
+	exit 1
+fi
+
+if [[ ! -d $mount ]]; then
+	set +x
+	echo
+	echo "Mountpoint ${mount} does not exist."
+	echo "Create it and make it user accessible (chown ${USER} ${mount})."
+	echo
+	exit 1
+fi
+
+# fetch the FS dump
+lpc55 read-memory --output-file ${fs} ${fs_offset} ${expected_fs_size}
+fs_size=$(stat -c%s ${fs})
+if (( ${fs_size} != ${expected_fs_size} )); then
+	exit 1
+fi
+
+# mount it
+sudo modprobe loop
+loop_device=$(sudo losetup --find --show ${fs})  # block size default is our 512B
+sudo chmod a+rw ${loop_device}
+# mkdir -p ${mount}
+lfs ${loop_device} ${mount}
+printf "loop_device=${loop_device}\nmount=${mount}" > ${state}
+tree -h ${mount}