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## ## mkshadow -- Make a shadow tree through symbolic links ## Copyright (c) 1998-2008 Ralf S. Engelschall <rse@engelschall.com> ## ## 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="mkshadow" str_usage="[-v|--verbose] [-t|--trace] [-a|--all] <src-dir> <dst-dir>" arg_spec="2=" opt_spec="v.t.a." opt_alias="v:verbose,t:trace,a:all" opt_v=no opt_t=no opt_a=no . ./sh.common # source and destination directory src=`echo "$1" | sed -e 's:/$::' -e 's:^\./\(.\):\1:'` dst=`echo "$2" | sed -e 's:/$::' -e 's:^\./\(.\):\1:'` # check whether source exists if [ ! -d $src ]; then echo "$msgprefix:Error: source directory not found: \`$src'" 1>&2 shtool_exit 1 fi # determine if one of the paths is an absolute path, # because then we have to use an absolute symlink oneisabs=0 case $src in /* ) oneisabs=1 ;; esac case $dst in /* ) oneisabs=1 ;; esac # determine reverse directory for destination directory dstrevdir='' if [ $oneisabs = 0 ]; then # derive reverse path from forward path pwd=`pwd` OIFS="$IFS"; IFS='/' for pe in $dst; do if [ "x$pe" = "x.." ]; then OIFS2="$IFS"; IFS="$DIFS" eval `echo "$pwd" |\ sed -e 's:\([^/]*\)$:; dir="\1":' \ -e 's:^\(.*\)/[^/]*;:pwd="\1";:'\ -e 's:^;:pwd="";:'` dstrevdir="$dir/$dstrevdir" IFS="$OIFS2" else dstrevdir="../$dstrevdir" fi done IFS="$OIFS" else src="`cd $src; pwd`"; fi # create directory tree at destination if [ ! -d $dst ]; then if [ ".$opt_t" = .yes ]; then echo "mkdir $dst" 1>&2 fi mkdir $dst fi if [ ".$opt_a" = .yes ]; then DIRS=`cd $src; find . -type d -print |\ sed -e '/^\.$/d' -e 's:^\./::'` else DIRS=`cd $src; find . -type d -print |\ sed -e '/\/CVS/d' -e '/^\.$/d' -e 's:^\./::'` fi for dir in $DIRS; do if [ ".$opt_t" = .yes ]; then echo "mkdir $dst/$dir" 1>&2 fi mkdir $dst/$dir done # fill directory tree with symlinks to files if [ ".$opt_a" = .yes ]; then FILES="`cd $src; find . -depth -print |\ sed -e 's/^\.\///'`" else FILES="`cd $src; find . -depth -print |\ sed -e '/\.o$/d' -e '/\.a$/d' -e '/\.so$/d' \ -e '/\.cvsignore$/d' -e '/\/CVS/d' \ -e '/\/\.#/d' -e '/\.orig$/d' \ -e 's/^\.\///'`" fi for file in $FILES; do # don't use `-type f' above for find because of symlinks if [ -d "$src/$file" ]; then continue fi basename=`echo $file | sed -e 's:^.*/::'` dir=`echo $file | sed -e 's:[^/]*$::' -e 's:/$::' -e 's:$:/:' -e 's:^/$::'` from=`echo "$src/$file" | sed -e 's/^\.\///'` to="$dst/$dir$basename" if [ $oneisabs = 0 ]; then if [ ".$dir" != . ]; then subdir=`echo $dir | sed -e 's:/$::'` # derive reverse path from forward path revdir='' OIFS="$IFS"; IFS='/' for pe in $subdir; do revdir="../$revdir" done IFS="$OIFS" # finalize from from="$revdir$from" fi from="$dstrevdir$from" fi if [ ".$opt_v" = .yes ]; then echo " $to" 1>&2 fi if [ ".$opt_t" = .yes ]; then echo "ln -s $from $to" 1>&2 fi ln -s $from $to done shtool_exit 0 ## ## manual page ## =pod =head1 NAME B<shtool-mkshadow> - B<GNU shtool> create shadow tree using symlinks =head1 SYNOPSIS B<shtool mkshadow> [B<-v>|B<--verbose>] [B<-t>|B<--trace>] [B<-a>|B<--all>] I<src-dir> I<dst-dir> =head1 DESCRIPTION This command creates a shadow tree of I<src-dir> under I<dst-dir> by recreating the directory hierarchy of I<src-dir> under I<dst-dir> and by creating the files of I<src-dir> by linking them into the corresponding directories under I<dst-dir> via symbolic links. When I<src-dir> can be reached via relative paths from I<dst-dir>, relative symbolic links are used, too. This high-level functionality is originally designed for developers to create copies of source trees. =head1 OPTIONS The following command line options are available. =over 4 =item B<-v>, B<--verbose> Display some processing information. =item B<-t>, B<--trace> Enable the output of the essential shell commands which are executed. =item B<-a>, B<--all> Really shadow all files and directories in I<src-dir>. Default is to skip CVS related files and directories, backup files, object files, etc. =back =head1 EXAMPLE # shell script shtool mkshadow -v -a . /tmp/shadow =head1 HISTORY The B<GNU shtool> B<mkshadow> command was originally written by Ralf S. Engelschall E<lt>rse@engelschall.comE<gt> in 1998 for B<Apache>. It was later revised and taken over into B<GNU shtool>. =head1 SEE ALSO shtool(1), ln(1). =cut