incubator-nuttx/tools/unlink.sh

#!/usr/bin/env bash
############################################################################
# tools/unlink.sh
#
#   Copyright (C) 2008 Gregory Nutt. All rights reserved.
#   Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################

link=$1

# Verify that arguments were provided

if [ -z "${link}" ]; then
	echo "Missing link argument"
	exit 1
fi

# Check if something already exists at the link path

if [ -e "${link}" ]; then

	# Yes, is it a symbolic link?  If so, then remove it

	if [ -h "${link}" ]; then
		rm -f "${link}"
	else

		# If the path is a directory and contains the "fake link" mark, then
		# treat it like a soft link (i.e., remove the directory)

		if [ -d "${link}" -a -f "${link}/.fakelnk" ]; then
			rm -rf "${link}"
		else

			# It is something else (like a file) or directory that does
			# not contain the "fake link" mark

			echo "${link} already exists but is not a symbolic link"
			exit 1
		fi
	fi
fi