#!/bin/sh

# Generate a krb5.conf file in the current directory for testing purposes.
# Takes one command-line argument: the default realm to use.  Strips out the
# entire [appdefaults] section to avoid picking up any local configuration and
# sets the default realm as indicated.
#
# The canonical version of this file is maintained in the rra-c-util package,
# which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
#
# Written by Russ Allbery <eagle@eyrie.org>
# Copyright 2016, 2020 Russ Allbery <eagle@eyrie.org>
# Copyright 2006-2008, 2010-2011
#     The Board of Trustees of the Leland Stanford Junior University
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
# SPDX-License-Identifier: MIT

set -e

# Load the test library.
. "$C_TAP_SOURCE/tap/libtap.sh"
cd "$C_TAP_BUILD"

# If there is no default realm specified on the command line, we leave the
# realm information alone.
realm="$1"

# Locate the krb5.conf file to use as a base.  Prefer the one in the test
# configuration area, if it exists.
krb5conf=`test_file_path config/krb5.conf`
if [ -z "$krb5conf" ] ; then
    for p in /etc/krb5.conf /usr/local/etc/krb5.conf ; do
        if [ -r "$p" ] ; then
            krb5conf="$p"
            break
        fi
    done
fi
if [ -z "$krb5conf" ] ; then
    echo 'no krb5.conf found, see test instructions' >&2
    exit 1
fi

# We found a krb5.conf file.  Generate our munged one.
mkdir -p tmp
awk '
    BEGIN                             { skip = 0 }
    /^ *\[appdefaults\]/              { skip = 1 }
    !/^ *\[appdefaults\]/ && / *\[/   { skip = 0 }

    { if (skip == 0) print }
' "$krb5conf" > tmp/krb5.conf.tmp
if [ -n "$realm" ] ; then
    pattern='^[ 	]*default_realm.*='
    if grep "$pattern" tmp/krb5.conf.tmp >/dev/null 2>/dev/null; then
        sed -e "s/\\(default_realm.*=\\) .*/\\1 $realm/" \
            tmp/krb5.conf.tmp >tmp/krb5.conf
    else
        (
            cat tmp/krb5.conf.tmp
            echo "[libdefaults]"
            echo "    default_realm = $realm"
        ) >tmp/krb5.conf
    fi
    rm tmp/krb5.conf.tmp
else
    mv tmp/krb5.conf.tmp tmp/krb5.conf
fi