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|
##
## mkln -- Make link with calculation of relative paths
## Copyright (c) 1999-2000 Ralf S. Engelschall <rse@engelschall.com>
## Originally written for shtool
##
## This file is part of shtool and free software; you can redistribute
## it and/or modify it under the terms of the GNU General Public
## License as published by the Free Software Foundation; either version
## 2 of the License, or (at your option) any later version.
##
## This file is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
## USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
##
str_tool="mkln"
str_usage="[-t] [-f] [-s] <src-path> [<src-path> ...] <dst-path>"
arg_spec="2+"
opt_spec="t.f.s."
opt_t=no
opt_f=no
opt_s=no
. ./sh.common
args=$?
srcs=""
while [ $# -gt 1 ]; do
srcs="$srcs $1"
shift
done
dst="$1"
if [ ! -d $dst ]; then
if [ $args -gt 2 ]; then
echo "$msgprefix:Error: multiple sources not allowed when target isn't a directory" 1>&2
exit 1
fi
fi
# determine link options
lnopt=""
if [ ".$opt_f" = .yes ]; then
lnopt="$lnopt -f"
fi
if [ ".$opt_s" = .yes ]; then
lnopt="$lnopt -s"
fi
# iterate over sources
for src in $srcs; do
# determine if one of the paths is an absolute path,
# because then we _have_ to use an absolute symlink
oneisabs=0
srcisabs=0
dstisabs=0
case $src in
/* ) oneisabs=1; srcisabs=1 ;;
esac
case $dst in
/* ) oneisabs=1; dstisabs=1 ;;
esac
# split source and destination into dir and base name
if [ -d $src ]; then
srcdir=`echo $src | sed -e 's;/*$;;'`
srcbase=""
else
srcdir=`echo $src | sed -e 's;^[^/]*$;;' -e 's;^\(.*/\)[^/]*$;\1;' -e 's;\(.\)/$;\1;'`
srcbase=`echo $src | sed -e 's;.*/\([^/]*\)$;\1;'`
fi
if [ -d $dst ]; then
dstdir=`echo $dst | sed -e 's;/*$;;'`
dstbase=""
else
dstdir=`echo $dst | sed -e 's;^[^/]*$;;' -e 's;^\(.*/\)[^/]*$;\1;' -e 's;\(.\)/$;\1;'`
dstbase=`echo $dst | sed -e 's;.*/\([^/]*\)$;\1;'`
fi
# consistency check
if [ ".$dstdir" != . ]; then
if [ ! -d $dstdir ]; then
echo "$msgprefix:Error: destination directory not found: $dstdir" 1>&2
exit 1
fi
fi
# make sure the source is reachable from the destination
if [ $dstisabs = 1 ]; then
if [ $srcisabs = 0 ]; then
if [ -d $srcdir ]; then
srcdir="`cd $srcdir; pwd | sed -e 's;/*$;;'`"
srcisabs=1
oneisabs=1
fi
fi
fi
# split away a common prefix
prefix=""
if [ ".$srcdir" = ".$dstdir" ] && [ ".$srcdir" != . ]; then
prefix="$srcdir/"
srcdir=""
dstdir=""
else
while [ ".$srcdir" != . ] && [ ".$dstdir" != . ]; do
presrc=`echo $srcdir | sed -e 's;^\([^/]*\)/.*;\1;'`
predst=`echo $dstdir | sed -e 's;^\([^/]*\)/.*;\1;'`
if [ ".$presrc" != ".$predst" ]; then
break
fi
prefix="$prefix$presrc/"
srcdir=`echo $srcdir | sed -e 's;^[^/]*/*;;'`
dstdir=`echo $dstdir | sed -e 's;^[^/]*/*;;'`
done
fi
# destination prefix is just the common prefix
dstpre="$prefix"
# determine source prefix which is the reverse directory
# step-up corresponding to the destination directory
srcpre=""
if [ $oneisabs = 0 ] || [ ".$prefix" != . -a ".$prefix" != ./ ]; then
pl="$dstdir/"
OIFS="$IFS"; IFS='/'
for pe in $pl; do
[ ".$pe" = . ] && continue
srcpre="../$srcpre"
done
IFS="$OIFS"
else
if [ $srcisabs = 1 ]; then
srcpre="$prefix"
fi
fi
# determine destination symlink name
if [ ".$dstbase" = . ]; then
if [ ".$srcbase" != . ]; then
dstbase="$srcbase"
else
dstbase=`echo "$prefix$srcdir" | sed -e 's;/*$;;' -e 's;.*/\([^/]*\)$;\1;'`
fi
fi
# now finalize source and destination directory paths
srcdir=`echo $srcdir | sed -e 's;\([^/]\)$;\1/;'`
dstdir=`echo $dstdir | sed -e 's;\([^/]\)$;\1/;'`
# run the final link command
if [ ".$opt_t" = .yes ]; then
echo "ln$lnopt $srcpre$srcdir$srcbase $dstpre$dstdir$dstbase"
fi
eval ln$lnopt $srcpre$srcdir$srcbase $dstpre$dstdir$dstbase
done
|
