#! /bin/sh
#
# Copyright (c) 2013 Nicira, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -e

run () {
    echo "$@"
    (cd "$sandbox" && "$@") || exit 1
}

builddir=
srcdir=
schema=
installed=false
built=false
for option; do
    # This option-parsing mechanism borrowed from a Autoconf-generated
    # configure script under the following license:

    # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
    # 2002, 2003, 2004, 2005, 2006, 2009, 2013 Free Software Foundation, Inc.
    # This configure script is free software; the Free Software Foundation
    # gives unlimited permission to copy, distribute and modify it.

    # If the previous option needs an argument, assign it.
    if test -n "$prev"; then
        eval $prev=\$option
        prev=
        continue
    fi
    case $option in
        *=*) optarg=`expr "X$option" : '[^=]*=\(.*\)'` ;;
        *) optarg=yes ;;
    esac

    case $dashdash$option in
        --)
            dashdash=yes ;;
        -h|--help)
            cat <<EOF
ovs-sandbox, for starting a sandboxed dummy Open vSwitch environment
usage: $0 [OPTION...]

If you run ovs-sandbox from an OVS build directory, it uses the OVS that
you built.  Otherwise, if you have an installed Open vSwitch, it uses
the installed version.

These options force ovs-sandbox to use a particular OVS build:
  -b, --builddir=DIR   specify Open vSwitch build directory
  -s, --srcdir=DIR     specify Open vSwitch source directory
These options force ovs-sandbox to use an installed Open vSwitch:
  -i, --installed      use installed Open vSwitch
  -S, --schema=FILE    use FILE as vswitch.ovsschema

Other options:
  -h, --help           Print this usage message.
EOF
            exit 0
            ;;

        --b*=*)
            builddir=$optarg
            built=:
            ;;
        -b|--b*)
            prev=builddir
            built=:
            ;;
        --sr*=*)
            srcdir=$optarg
            built=false
            ;;
        -s|--sr*)
            prev=srcdir
            built=false
            ;;
        -i|--installed)
            installed=:
            ;;
        --sc*=*)
            schema=$optarg
            installed=:
            ;;
        -S|--sc*)
            prev=schema
            installed=:
            ;;
        -*)
            echo "unrecognized option $option (use --help for help)" >&2
            exit 1
            ;;
        *)
            echo "$option: non-option arguments not supported (use --help for help)" >&2
            exit 1
            ;;
    esac
    shift
done

if $installed && $built; then
    echo "sorry, conflicting options (use --help for help)" >&2
    exit 1
elif $installed || $built; then
    :
elif test -e vswitchd/ovs-vswitchd; then
    built=:
    builddir=.
elif (ovs-vswitchd --version) >/dev/null 2>&1; then
    installed=:
else
    echo "can't find an OVS build or install (use --help for help)" >&2
    exit 1
fi

if $built; then
    if test ! -e "$builddir"/vswitchd/ovs-vswitchd; then
        echo "$builddir does not appear to be an OVS build directory" >&2
        exit 1
    fi
    builddir=`cd $builddir && pwd`

    # Find srcdir.
    case $srcdir in
        '')
            srcdir=$builddir
            if test ! -e "$srcdir"/WHY-OVS; then
                srcdir=`cd $builddir/.. && pwd`
            fi
            ;;
        /*) ;;
        *) srcdir=`pwd`/$srcdir ;;
    esac
    schema=$srcdir/vswitchd/vswitch.ovsschema
    if test ! -e "$schema"; then
        echo >&2 'source directory not found, please use --srcdir'
        exit 1
    fi

    # Put built tools early in $PATH.
    if test ! -e $builddir/vswitchd/ovs-vswitchd; then
        echo >&2 'build not found, please change set $builddir or change directory'
        exit 1
    fi
    PATH=$builddir/ovsdb:$builddir/vswitchd:$builddir/utilities:$PATH
    export PATH
else
    case $schema in
        '')
            for schema in \
                /usr/local/share/openvswitch/vswitch.ovsschema \
                /usr/share/openvswitch/vswitch.ovsschema \
                none; do
                if test -r $schema; then
                    break
                fi
            done
            ;;
        /*) ;;
        *) schema=`pwd`/$schema ;;
    esac
    if test ! -r "$schema"; then
        echo "can't find vswitch.ovsschema, please specify --schema" >&2
        exit 1
    fi
fi

# Create sandbox.
rm -rf sandbox
mkdir sandbox
sandbox=`cd sandbox && pwd`

# Set up environment for OVS programs to sandbox themselves.
OVS_RUNDIR=$sandbox; export OVS_RUNDIR
OVS_LOGDIR=$sandbox; export OVS_LOGDIR
OVS_DBDIR=$sandbox; export OVS_DBDIR
OVS_SYSCONFDIR=$sandbox; export OVS_SYSCONFDIR

if $built; then
    # Easy access to OVS manpages.
    (cd "$builddir" && make install-man mandir="$sandbox"/man)
    MANPATH=$sandbox/man:; export MANPATH
fi

# Ensure cleanup.
trap 'kill `cat "$sandbox"/*.pid`' 0 1 2 3 13 14 15

# Create database and start ovsdb-server.
touch "$sandbox"/.conf.db.~lock~
run ovsdb-tool create conf.db "$schema"
run ovsdb-server --detach --no-chdir --pidfile -vconsole:off --log-file \
    --remote=punix:"$sandbox"/db.sock

# Start ovs-vswitchd.
run ovs-vswitchd --detach --no-chdir --pidfile -vconsole:off --log-file \
    --enable-dummy=override -vvconn -vnetdev_dummy

cat <<EOF



----------------------------------------------------------------------
You are running in a dummy Open vSwitch environment.  You can use
ovs-vsctl, ovs-ofctl, ovs-appctl, and other tools to work with the
dummy switch.  

Log files, pidfiles, and the configuration database are in the
"sandbox" subdirectory.

Exit the shell to kill the running daemons.
EOF

status=0; $SHELL || status=$?

cat <<EOF
----------------------------------------------------------------------



EOF

exit $status