Uniformizes how THIS_DIR is computed in xplat/js

Summary: This form of THIS_DIR resolves symlinks, which is better.

Reviewed By: davidaurelio

Differential Revision: D8661886

fbshipit-source-id: 90bf329e765d9623d103b03c5dd3b71fae9d9854

IntegrationTests/launchWebSocketServer.command

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 # Copyright (c) 2015-present, Facebook, Inc.
 #
@@ -9,7 +9,7 @@
 echo -en "\033]0;Web Socket Test Server\a"
 clear
 
-THIS_DIR=$(dirname "$0")
+THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
 pushd "$THIS_DIR"
 ./websocket_integration_test_server.js
 popd

runXcodeTests.sh

@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 # This script should be run from the react-native root
 
-THIS_DIR=$(dirname "$0")
+THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
 source "scripts/.tests.env"
 
 if [ -n "$1" ]

scripts/launchPackager.command

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 # Copyright (c) 2015-present, Facebook, Inc.
 #
@@ -9,7 +9,7 @@
 echo -en "\033]0;Metro Bundler\a"
 clear
 
-THIS_DIR=$(dirname "$0")
+THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
 . "$THIS_DIR/packager.sh"
 
 echo "Process terminated. Press <enter> to close the window"

scripts/packager.sh

@@ -1,11 +1,11 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 # Copyright (c) 2015-present, Facebook, Inc.
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-THIS_DIR=$(dirname "$0")
+THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
 source "${THIS_DIR}/.packager.env"
 cd "$THIS_DIR/.."
 node "./local-cli/cli.js" start "$@"

scripts/run-android-emulator.sh

@@ -6,7 +6,7 @@
 # virtual device configuration.
 # This is useful for running integration tests on a local machine.
 
-THIS_DIR=$(dirname "$0")
+THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
 
 STATE=`adb get-state`