src/developer/ffx/scripts/ffx

#!/bin/bash
# Copyright 2020 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.

# LINT.IfChange
function find_tree_root {
  local parent="$1"
  if [[ ! -d "$parent" ]]; then
    return 1
  fi
  # TODO(https://fxbug.dev/505045726): Migrate off of `.jiri_root` as a marker for the root of a
  # fuchsia checkout.
  while [[ ! -f "${parent}/.fx-root" && ! -d "${parent}/.jiri_root" ]]; do
    parent="$(dirname "${parent}")"
    if [[ "$parent" == "/" ]]; then
      return 1
    fi
  done
  echo "$parent"
}

# We walk the parent directories looking for //.fx-root rather than using
# BASH_SOURCE so that we find the fuchsia_dir enclosing the current working
# directory instead of the one containing this file in case the user has
# multiple source trees and is picking up this file from another one.
#
# NOTE: The FUCHSIA_DIR environment variable is ignored here because it
# could point to a different Fuchsia checkout in some developer setups.
if ! fuchsia_dir="$(find_tree_root "$(pwd)")"; then
  echo >&2 "ERROR: Cannot find the Platform Source Tree in a parent of the current directory: $(pwd)"
  exit 1
fi

script_dir="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"

# NOTE: This check MUST be executed immediately after `fuchsia_dir` is set.
# Do NOT add any metric gathering or other setup before this block, as this
# `ffx` instance may be run in a foreign fuchsia checkout.
if [[ "${script_dir}/" != "${fuchsia_dir}/"* ]]; then
  # When running `ffx` from `$PATH` within a foreign fuchsia checkout
  # that is owned by the current user, run the version of `ffx` from
  # the foreign checkout instead.
  if [[ "$0" == *"/.jiri_root/bin/"* ]] && \
     [[ -O "${fuchsia_dir}" ]] && \
     [[ -x "${fuchsia_dir}/src/developer/ffx/scripts/ffx" ]]; then
    exec "${fuchsia_dir}/src/developer/ffx/scripts/ffx" "$@"
  fi

  echo >&2 "ERROR: You are executing ffx from outside of the current source tree"
  echo >&2 "ERROR: This is not supported as fx does not have a stable internal API"
  echo >&2
  echo >&2 "    'ffx' was executed from: ${BASH_SOURCE[0]}"
  echo >&2 "    'fuchsia directory' resolved to: ${fuchsia_dir}"
  echo >&2 "    'script_dir' resolved to: ${script_dir}"
  echo >&2
  echo >&2 "To run a command in the current Fuchsia directory, run fx from:"
  echo >&2 "  ${fuchsia_dir}/scripts/fx ffx"
  exit 1
fi
# LINT.ThenChange(
#   //scripts/fx,
#   //scripts/hermetic-env,
#   //scripts/zsh-completion/_fx,
# )

# This script is usually used to invoke `ffx` directly while in-tree without
# explicitly wrapping it in `fx` (ie. `fx ffx --help`). If we don't set a
# wrapper here, the `fx`'s ffx subscript will override it and produce confusing
# help output.
# So be explicit, and unless something else overrode this when invoking *this*
# script, force our 'name' to just be `ffx`.
FFX_WRAPPER_INVOKE=${FFX_WRAPPER_INVOKE:-ffx}
export FFX_WRAPPER_INVOKE

exec "${fuchsia_dir}"/scripts/fx ffx --config fuchsia.analytics.ffx_invoker=fx "$@"