8c0eca54cd
The script relpath.sh returns the relative path of the first directory from the second directory. It is used to generate relative symlinks, which can be useful if the build directory is embedded in the dpdk directory: the whole dpdk can be moved without breaking the links, which is helpful for an installation. In case the build directory is a symlink, the script was not generating the proper relative path. Fix this by calling "readlink -f" on the arguments. Signed-off-by: Olivier Matz <olivier.matz@6wind.com> Tested-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
104 lines
2.8 KiB
Bash
Executable File
104 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=$REL2
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prev_left2=
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while [ "${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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