crossvm/tools/examples/example_fs

#!/bin/bash
# Copyright 2023 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Example VM with a shared directory

set -e

SRC=$(realpath "$(dirname "${BASH_SOURCE[0]}")")
#If "example_simple" is executed, reuse its image. Otherwise, create one.
mkdir -p "$SRC/images/simple" && cd "$_"
mkdir -p "host_shared_dir"
HOST_SHARED_DIR="$SRC/images/simple/host_shared_dir"

if ! [ -f rootfs ]; then
    # Build a simple ubuntu image and create a user with no password.
    virt-builder ubuntu-20.04 \
        --run-command "useradd -m -g sudo -p '' $USER ; chage -d 0 $USER" \
        -o ./rootfs

    virt-builder --get-kernel ./rootfs -o .
fi

# Use crosvm/tools/examples/images/simple/host_shared_dir as mount point
cargo run -- run \
    --shared-dir "$HOST_SHARED_DIR:my_shared_tag:type=fs" \
    --rwdisk ./rootfs \
    --initrd ./initrd.img-* \
    -p "root=/dev/vda5 " \
    ./vmlinuz-*

## In guest OS, run following instructions to set up the shared directory
## sudo su
## mkdir /tmp/guest_shared_dir
## mount -t virtiofs my_shared_tag /tmp/guest_shared_dir