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/usr/bin/fai-do-scripts is in fai-client 5.3.6ubuntu1.

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The actual contents of the file can be viewed below.

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#! /bin/bash

#*********************************************************************
#
# fai-do-scripts - call configuration scripts for every defined class
#
# This script is part of FAI (Fully Automatic Installation)
# (c) 2003-2016 by Thomas Lange, lange@informatik.uni-koeln.de
# Universitaet zu Koeln
#
#*********************************************************************
# 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.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licences/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at http://www.gnu.org/copyleft/gpl.html. You
# can also obtain it by writing to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#*********************************************************************

# variables needed: $classes, $cfclasses, $LOGDIR
#
# And many other variables like:

# execute all scripts that match the name of a class.
# If class is a directory, execute all $class/[0-9][0-9]* scripts in
# it, but do not execute files ending in ~

maxstatus=0
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
savemaxstatus() {

    exitcode=$1 # set global variable
    # save the highest exit status
    [ $1 -gt $maxstatus ] && maxstatus=$1
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
fc_check_status() {

    local cmd st res
    cmd=$1
    st=$2

    if [ $st -eq 0 ]; then
        res="OK."
    else
        res="FAILED with exit code $st."
    fi
    # put result in the log file and write to stdout
    printf "%-20s $res\n" $cmd | tee -a $LOGDIR/status.log
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
call_conf() {

    local class f
    cd $1
    for class in $classes ; do
        [ -x $class -a -f $class ] && do_script $class
        if [ -d $class ]; then
           for f in $(echo $class/[0-9][0-9]* ) ; do
               [ -x $f -a -f $f ] && do_script $f
           done
        fi
    done
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
vecho() {

    if [ X$verbose = X1 ]; then
	echo $*
    fi
}

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
do_script() {

    # execute scripts and save their output in log files
    # cfengine, shell, perl and expect scripts are known types
    local shelldebug file filetype name

    file=$1

    # may be remove some day
    case $file in
        *~) [ X$debug = X1 ] && echo "Skipping backup file $file";   return ;;
        *.dpkg-old)  [ X$debug = X1 ] && echo "Skipping file $file"; return ;;
        *.dpkg-new)  [ X$debug = X1 ] && echo "Skipping file $file"; return ;;
        *.dpkg-inst) [ X$debug = X1 ] && echo "Skipping file $file"; return ;;
        *.dpkg-tmp)  [ X$debug = X1 ] && echo "Skipping file $file"; return ;;
        *.dpkg-dist) [ X$debug = X1 ] && echo "Skipping file $file"; return ;;
    esac

    name=${file##*/}  # basename function
    filetype=$(file -bL $file)

    if [ "$fake" ]; then
        echo "Executing $filetype"
        return
    fi

    shelldebug=
    case $filetype in
        *"POSIX shell script"*|*"Bourne shell script"*)
            [ X$debug = X1 ] && shelldebug="sh -x" ;;
        *"Bourne-Again shell script"*)
            [ X$debug = X1 ] && shelldebug="bash -x" ;;
        *"zsh script"*)
            [ X$debug = X1 ] && shelldebug="zsh -x" ;;
    esac

    case $filetype in

        *"POSIX shell script"*|*"executable shell script"*|*"/bash script"*|*"Bourne shell script"*|*"Bourne-Again shell script"*|*"zsh script"*)
            vecho "Executing   $shelldebug shell: $file"
            echo "=====   shell: $file   =====" >> $LOGDIR/shell.log 2>&1
            $shelldebug ./$file >> $LOGDIR/shell.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/shell.log
        ;;

        *"cf-agent"*)
            vecho "Executing cf-agent: $file"
            echo "=====   cf-agent: $file   =====" >> $LOGDIR/cfagent.log 2>&1
            ./$file $cfagentdebug -KI -D${cfclasses} >> $LOGDIR/cfagent.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/cfagent.log
        ;;

        *"cfagent"*)
            vecho "Executing cfagent: $file"
            echo "=====   cfagent: $file   =====" >> $LOGDIR/cfagent.log 2>&1
            ./$file $cfagentdebug -qKI -D${cfclasses} >> $LOGDIR/cfagent.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/cfagent.log
        ;;

        *"cfengine script"*)
            vecho "Executing cfengine: $file"
            echo "=====   cfengine: $file   =====" >> $LOGDIR/cfengine.log 2>&1
            ./$file -K -v -f $file -D${cfclasses} >> $LOGDIR/cfengine.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/cfengine.log
        ;;

        *[Pp]erl*script*)
            vecho "Executing    perl: $file"
            echo "=====   perl: $file   =====" >> $LOGDIR/perl.log 2>&1
            ./$file >> $LOGDIR/perl.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/perl.log
        ;;

        *"expect script"*)
            vecho "Executing  expect: $file"
            echo "=====   expect: $file   =====" >> $LOGDIR/expect.log 2>&1
            ./$file >> $LOGDIR/expect.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/expect.log
        ;;

        *[Pp]ython*script*)
            vecho "Executing  python: $file"
            echo "=====   python: $file   =====" >> $LOGDIR/python.log 2>&1
            ./$file >> $LOGDIR/python.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/python.log
        ;;

        *[Rr]uby*script*)
            vecho "Executing ruby: $file"
            echo "=====   ruby: $file   =====" >> $LOGDIR/ruby.log 2>&1
            ./$file >> $LOGDIR/ruby.log 2>&1
            savemaxstatus $?
            fc_check_status $file $exitcode | tee -a $LOGDIR/ruby.log
        ;;

        *) echo "File $file has unsupported type $filetype." ;;
    esac
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
usage() {

    local ex
    ex=$1
    cat <<-EOF
        fai-do-scripts Copyright (C) 2003-2010 Thomas Lange
        Read the manual page fai-do-scripts(1) for more information.

        Usage: fai-do-scripts [OPTION] DIRECTORY

EOF
    exit $ex
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 # main program

while getopts "nhL:" opt ; do
    case "$opt" in
        h) usage 0 ;;
        L) LOGDIR=$OPTARG; export LOGDIR ;;
        n) fake=1 ;;
    esac
done
shift $(($OPTIND - 1))
[ -z "$1" ] || [ -n "$2" ] && usage 1

if [ "x$classes" = "x" ]; then
    echo "No classes are defined."
    exit 9
fi

[ X$debug = X1 ] && cfagentdebug=-v

call_conf $1
# move error number from child scripts to 100+x if any error happened
[ $maxstatus -gt 0 ] && maxstatus=$((100+$maxstatus))
exit $maxstatus