tools/devshell/cog

#!/bin/bash
# Copyright 2026 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#### CATEGORY=Source
### Run fx commands in the cog workspace.
## usage: fx cog <args>
##
## This is a wrapper around `fx` that runs the commands in the Cog workspace.
## The script would do some basic setup and then run the commands in the
## companion CartFS.

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
set -e

readonly GIT_CITC_PATH="$(which git-citc)"

cartfs_dir=$(readlink -e "${FUCHSIA_DIR}/cartfs-dir")
if [[ ! -d "${cartfs_dir}" ]]; then
  echo "This command is only available in Cog workspaces."
  exit 1
fi

# Compute the base commit hash
base_commit_hash=$(${GIT_CITC_PATH} api.get-repo-states fuchsia | grep base_commit_hash | awk '{print $2}' | tr -d '"')

base_commit_hash_in_cartfs=$(cd "${cartfs_dir}/fuchsia" && git rev-parse HEAD)

# if the base commit hash is different from the one in CartFS, then we need to
# update the CartFS.
if [[ "${base_commit_hash}" != "${base_commit_hash_in_cartfs}" ]]; then
  echo "Updating CartFS to base commit hash ${base_commit_hash}..."
  "${FUCHSIA_DIR}/scripts/cog/setup_cog_workspace.py"
fi


# Get diff between current working copy and base commit hash
added_or_modified_files=$(${GIT_CITC_PATH} cli.diff ${base_commit_hash} @ | grep '^\[[AM]\]' | awk '{print $2}')

# Copy files to CartFS
for file in ${added_or_modified_files[@]}; do
  sha256_cog=$(sha256sum "${file}" | awk '{print $1}')
  sha256_cartfs=""
  if [[ -f "${cartfs_dir}/fuchsia/${file}" ]]; then
    sha256_cartfs=$(sha256sum "${cartfs_dir}/fuchsia/${file}" | awk '{print $1}')
  fi
  if [[ "${sha256_cog}" != "${sha256_cartfs}" ]]; then
    cp "${file}" "${cartfs_dir}/fuchsia/${file}"
  fi
done

(
  cd "${cartfs_dir}/fuchsia"
  .jiri_root/bin/fx "$@"
)