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createmodule.sh
#!/bin/bash # # createmodule.sh - Takes the name of a environment init script and # produces a modulefile that duplicates the changes made by the init script # # Copyright (C) 2010-2012 by Orion E. Poplawski <orion@cora.nwra.com> # # This program is 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 program 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, see <http://www.gnu.org/licenses/>. usage="Usage: $0 [-p prefix] <initscript> [args]" usage() { echo $usage 1>&2 exit 1 } while getopts "p:" opt do case $opt in p) prefix=$OPTARG; shift 2;; *) usage;; esac done # Need a script name [ -z "$1" ] && usage # Need to be a readable script if [ ! -r "$1" ] then echo "ERROR: Cannot read $1" 1>&2 exit 1 fi #Will print out array assignment list printenvarray () { local skip=0 env | while read x do # start of function definition: skip full definition if [[ "$x" =~ '() {' ]]; then skip=1 fi if [ $skip -eq 0 ]; then key=${x%%=*} value=`printenv "$key"` if [ $? -eq 0 ] then echo [$key]="'$value'" fi fi # end of function definition if [ "$x" = '}' ]; then skip=0 fi done } #Apparently we need to declare the associative arrays declare -A env1 env2 #Record starting environment eval env1=(`printenvarray`) #Source the environment script . "$@" >/dev/null #Record ending environment eval env2=(`printenvarray`) #Print out the modulefile echo "#%Module 1.0" #Prefix [ -n "$prefix" ] && echo -e "\nset prefix $prefix\n" # dedup - remove duplicate entries from a list #Subshell so we can sort the output ( dedup() { list=`mktemp` [ -n "$2" ] && sep=$2 || sep=: echo $1 | sed -r -e 's,[^/]+/\.\./,,g' -e 's,[^/]+/\.\./,,g' -e "s/\\$sep/\n/g" | while read x do grep -q -Fx ${x} $list && continue if [ -n "$prefix" ] then echo $x | sed -e s,$prefix,\$prefix, else echo $x fi echo $x >> $list done | tr '\n' $sep | sed -e "s/\\$sep\$//" rm $list } #Keys that changed for key in "${!env1[@]}" do if [ "${env1[$key]}" != "${env2[$key]}" ] then #Working directory change if [ "$key" = PWD ] then if [ -n "$prefix" ] then echo -e "chdir\t\t${env2[PWD]}" | sed -e s,$prefix,\$prefix,g else echo -e "chdir\t\t${env2[PWD]}" fi #Test for delete elif [ -z "${env2[$key]}" ] then echo -e "unsetenv\t${key}\t${env2[$key]}" #Test for prepend elif [ "${env2[$key]%${env1[$key]}}" != "${env2[$key]}" ] then added=${env2[$key]%${env1[$key]}} sep=${added: -1} added=${added%$sep} added=$(dedup $added $sep) if [ $sep = : ] then echo -e "prepend-path\t$key\t${added}" else echo -e "prepend-path\t--delim $sep\t$key\t${added}" fi #Test for prepend plus : added at end (MANPATH) elif [ "${key: -4}" = PATH -a "${env2[$key]%${env1[$key]}:}" != "${env2[$key]}" ] then added=$(dedup ${env2[$key]%${env1[$key]}:}) echo -e "prepend-path\t$key\t${added}" #Test for append elif [ "${env2[$key]#${env1[$key]}}" != "${env2[$key]}" ] then added=${env2[$key]#${env1[$key]}} sep=${added:0:1} added=${added#$sep} added=$(dedup $added $sep) if [ $sep = : ] then echo -e "append-path\t$key\t${added}" else echo -e "append-path\t--delim $sep\t$key\t${added}" fi #Test for prepend plus append elif [ "${env2[$key]%${env1[$key]}*}" != "${env2[$key]}" ] then prepended=${env2[$key]%${env1[$key]}*} presep=${prepended: -1} prepended=${prepended%$presep} prepended=$(dedup $prepended $presep) appended=${env2[$key]#*${env1[$key]}} appsep=${appended:0:1} appended=${appended#$appsep} appended=$(dedup $appended $appsep) if [ $presep != $appsep -o -z "$prepended" -o -z "$appended" ] then #Unhandled echo "Unhandled change of $key" 1>&2 echo "Before <${env1[$key]}>" 1>&2 echo "After <${env2[$key]}>" 1>&2 else if [ $presep = : ] then echo -e "prepend-path\t$key\t${prepended}" echo -e "append-path\t$key\t${appended}" else echo -e "prepend-path\t--delim $presep\t$key\t${prepended}" echo -e "append-path\t--delim $appsep\t$key\t${appended}" fi fi else if [ -n "$prefix" ] then echo -e "setenv\t\t${key}\t${env2[$key]}" | sed -e s,$prefix,\$prefix,g else echo -e "setenv\t\t${key}\t${env2[$key]}" fi fi fi #Delete keys we have handled unset env1[$key] unset env2[$key] done #New keys for key in "${!env2[@]}" do if [ "$key" = OLDPWD ] then continue fi #Use prepend-path for new paths if [ "${key: -4}" = PATH -o "${key: -4}" = DIRS -o "${key: -4}" = FILES ] then # TODO - Need to handle stripping of default MANPATH echo -e "prepend-path\t${key}\t"$(dedup ${env2[$key]}) else if [ -n "$prefix" ] then echo -e "setenv\t\t${key}\t${env2[$key]}" | sed -e s,$prefix,\$prefix,g else echo -e "setenv\t\t${key}\t${env2[$key]}" fi fi done ) | sort # vim:set tabstop=2 shiftwidth=2 expandtab autoindent:
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