#!/bin/sh
#
# 2016 Darko Poljak (darko.poljak at gmail.com)
#
# This file is part of cdist.
#
# cdist 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 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
# This explorer returns script code string for running a command with su
# or sudo, whichever it founds. If searches the command in the order of
# first su and then sudo if su is not found.
# If no su nor sudo is found then it returns string script code to run
# bare command.
# It uses two arguments, first user and the second command to run.
# If the result string is assigned to foo it can be used in code
# generation as:
# echo "$foo user command"
#

sudo_func() {
    which sudo > /dev/null 2>&1
    if [ $? -eq 0 ]
    then
        func='f() { sudo -H -u $1 $2; }'
        retval=0
    else
        func=''
        retval=1
    fi
    return $retval
}
su_func() {
    which su > /dev/null 2>&1
    if [ $? -eq 0 ]
    then
        func='f() { su -c "$2" $1 ; }'
        retval=0
    else
        func=''
        retval=1
    fi
    return $retval
}
# first check su
su_func
if [ $? -ne 0 ]
then
    # if no su then check sudo
    sudo_func
    if [ $? -ne 0 ]
    then
        # if no su nor sudo then run bare command
        func='f() { $2 ; }'
    fi
fi
echo "eval '${func}' ; f "