106 lines
2.8 KiB
Bash
Executable File
106 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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# BSD LICENSE
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#
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# Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Intel Corporation nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# print the relative path of $1 from $2 directory
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# $1 and $2 MUST be absolute paths
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#
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if [ $# -ne 2 ]; then
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echo "Bad arguments"
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echo "Usage:"
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echo " $0 path1 path2"
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exit 1
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fi
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# get the real absolute path, derefencing symlinks
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ABS1=$(readlink -f $1)
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ABS2=$(readlink -f $2)
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# remove leading slash
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REL1=${ABS1#/}
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REL2=${ABS2#/}
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left1=${REL1%%/*}
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right1=${REL1#*/}
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prev_right1=$REL1
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prev_left1=
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left2=${REL2%%/*}
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right2=${REL2#*/}
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prev_right2=$REL2
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prev_left2=
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prefix=
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while [ "${right1}" != "" -a "${right2}" != "" ]; do
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if [ "$left1" != "$left2" ]; then
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break
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fi
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prev_left1=$left1
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left1=$left1/${right1%%/*}
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prev_right1=$right1
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right1=${prev_right1#*/}
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if [ "$right1" = "$prev_right1" ]; then
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right1=""
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fi
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prev_left2=$left2
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left2=$left2/${right2%%/*}
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prev_right2=$right2
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right2=${prev_right2#*/}
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if [ "$right2" = "$prev_right2" ]; then
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right2=""
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fi
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done
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if [ "${left1}" != "${left2}" ]; then
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right2=${prev_right2}
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right1=${prev_right1}
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fi
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while [ "${right2}" != "" ]; do
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prefix=${prefix}../
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prev_right2=$right2
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right2=${right2#*/}
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if [ "$right2" = "$prev_right2" ]; then
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right2=""
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fi
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done
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echo ${prefix}${right1}
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exit 0
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