# $Id: vserver.start,v 1.48 2006/01/22 12:24:25 ensc Exp $  --*- sh -*--

# Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
#  
# 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; version 2 of the License.
#  
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


lock "$__LOCKDIR"/vserver."$($_VSERVER_INFO "$VSERVER_DIR" CANONIFY)".startup

if isVserverRunning "$VSERVER_DIR"; then
    warning $"vserver '$VSERVER_NAME' already running"
    exit 0
fi

function cleanup()
{
    set +e

    test -z "$startsync_pipe"  || $_RM -f "$startsync_pipe"
    test -z "$is_started"      || { unlock; return 0; }

    if test -n "$is_configured" -a -z "$is_executed"; then
	warning $"
An error occured while executing the vserver startup sequence; when
there are no other messages, it is very likely that the init-script
(${INITCMD_START[@]}) failed.

Common causes are:
* /etc/rc.d/rc on Fedora Core 1 and RH9 fails always; the 'apt-rpm' build
  method knows how to deal with this, but on existing installations,
  appending 'true' to this file will help."
    fi

    if test -n "$is_executed"; then
	warning $"
An error occured after executing the vserver startup sequence. This
means that some processes may exist in the created context and the
manual execution of

  $_VSERVER '$VSERVER_DIR' stop

is recommended to fix this."
    else
	warning $"

Failed to start vserver '$VSERVER_NAME'"
    fi

    test -n "$OPTION_DEBUG"    || exec 2>/dev/null >/dev/null
    test -z "$is_mounted"      || umountVserver     "$VSERVER_DIR" || :
    test -z "$have_interfaces" || disableInterfaces "$VSERVER_DIR" || :

    unlock || :
}

is_configured=
is_executed=
is_started=
is_mounted=
is_vshelper_init=
have_interfaces=
startsync_pipe=
have_initcmd=

while test "$#" -gt 0; do
    case "$1" in
	(--rescue)	INITSTYLE=rescue;;
	(--rescue-cmd)
	    warning $"\
The '--rescue-cmd' option is deprecated; just add the the initcmd
inclusive its arguments to the cmdline."
	    INITCMD_RESCUE=( $2 );
	    have_initcmd=1
	    shift;;
	(--)		shift; break;;
	(-*)		panic $"vserver ... start: unknown option '$1'";;
	(*)		break;
    esac
    shift
done

if test x"$INITSTYLE" = xrescue -a -z "$have_initcmd" -a "$#" -gt 0; then
    INITCMD_RESCUE=( "$@" )
fi


set -e
trap "cleanup" EXIT

sanityCheck      "$VSERVER_DIR"

mountRootFS      "$VSERVER_DIR"
generateOptions  "$VSERVER_DIR"

pushd "$VSERVER_DIR" >/dev/null
execScriptlets   "$VSERVER_DIR" "$VSERVER_NAME" prepre-start
popd >/dev/null

setDiskLimits    "$VSERVER_DIR"

enableInterfaces "$VSERVER_DIR" && have_interfaces=1

mountVserver "$VSERVER_DIR"     && is_mounted=1
prepareInit  "$VSERVER_DIR"

pushd "$VSERVER_DIR"/vdir/ >/dev/null
execScriptlets   "$VSERVER_DIR" "$VSERVER_NAME" pre-start
popd >/dev/null

test -z "$OPTION_DEFAULTTTY" || setDefaultTTY "$VSERVER_DIR"

pushd "$VSERVER_DIR"/vdir/ >/dev/null
is_configured=1
if $_VSERVER_INFO - FEATURE migrate; then
    ${NICE_CMD[@]} \
    $_CHBIND      "${CHBIND_OPTS[@]}" -- \
    $_EXEC_ULIMIT "$VSERVER_DIR"/ulimits \
    $_VCONTEXT   --create "${OPTS_VCONTEXT_CREATE[@]}" -- \
    ${USE_VNAMESPACE:+$_VNAMESPACE --set -- } \
    $_VLIMIT     --dir "$VSERVER_DIR"/rlimits --missingok -- \
    $_VSCHED     --xid self "${OPTS_VSCHED[@]}" -- \
    $_VUNAME     --xid self --dir "$VSERVER_DIR"/uts     --missingok -- \
    "${VSERVER_EXTRA_CMDS[@]}" \
    $_VUNAME     --xid self --set -t context="$VSERVER_DIR" -- \
    $_VATTRIBUTE --set "${OPTS_VATTRIBUTE[@]}" -- \
    $_SAVE_CTXINFO "$VSERVER_DIR" \
    $_ENV -i -- \
    $_VCONTEXT   --migrate-self --endsetup --chroot $SILENT_OPT \
    "${OPTS_VCONTEXT_MIGRATE[@]}" "${OPTS_VCONTEXT_ENTER[@]}" -- \
    "${INITCMD_START[@]}"
else
    if test -n "$_IS_FAKEINIT"; then
	startsync_pipe=$($_MKTEMP vserver-start.XXXXXX)
	$_RM -f "$startsync_pipe"
	$_MKFIFO -m600 "$startsync_pipe"	## safe, since mkfifo does not follow symlinks
    fi
    
    ${NICE_CMD[@]} \
    $_CHBIND           "${CHBIND_OPTS[@]}" \
    $_EXEC_ULIMIT      "$VSERVER_DIR/ulimits" \
    $_CHCONTEXT_COMPAT "${CHCONTEXT_OPTS[@]}" "${CHCONTEXT_INIT_OPTS[@]}" \
    $_SAVE_CTXINFO     "$VSERVER_DIR" \
    $_ENV -i -- \
    $_CHAINECHO "${_IS_FAKEINIT:+$startsync_pipe}" "" \
    $_CAPCHROOT        "${CAPCHROOT_OPTS[@]}" . \
    "${INITCMD_START[@]}"

    ## the additional synchronization step is needed since vshelper.doInit
    ## below might be executed before needed context information were
    ## saved by $_SAVE_CTXINFO
    ${_IS_FAKEINIT:+cat "$startsync_pipe"} >/dev/null
fi
is_executed=1

"${INITCMD_START_SYNC[@]}"
popd >/dev/null

pushd "$VSERVER_DIR"/vdir/ >/dev/null
execScriptlets   "$VSERVER_DIR" "$VSERVER_NAME" post-start
popd >/dev/null

is_vshelper_init=1
! vshelper.isEnabled "" "$VSERVER_DIR" || vshelper.doInit "$VSERVER_DIR"

is_started=1
