/usr/share/bash-completion/completions/vserver is in util-vserver 0.30.216-pre3120-1.4+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303  | # Completion for the vserver command. Source this file (or on some systems
# add it to ~/.bash_completion and start a new shell) and bash's completion
# mechanism will know all about vserver's options!
#
# Copyright (C) Thomas Champagne <lafeuil@gmail.com>
#
# 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, 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.
#
# 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.
#
# The latest version of this software can be obtained here:
#
# http://linux-vserver.org/Vserver+Completion
#
# version 0.4.0
have vserver-info && {
: ${UTIL_VSERVER_VARS:=$(/usr/sbin/vserver-info - SYSINFO |grep prefix: | awk '{ print $2}')/lib/util-vserver/util-vserver-vars}
test -e "$UTIL_VSERVER_VARS" && {
	
if [ -z "$_VS_NEWLINE" -o -z "$VS_ALLVSERVERS_ARGS" ]
then
        . "$UTIL_VSERVER_VARS"
        . "$_LIB_FUNCTIONS"
fi
_vserver() {
    local cur cmds cmdOpts cmdMethodOpts helpCmds names names_pipe func i j method
    
    COMPREPLY=()
    cur=${COMP_WORDS[COMP_CWORD]}
    
    # find available v-servers: 
    # call function getAllVservers in vserver library
    getAllVservers names
    names_pipe=`echo ${names[@]} | sed 's/ /|/g'`
    
    # available commands
    cmds='start stop restart condrestart suexec exec enter chkconfig \
	running status unify pkg apt-get apt-config apt-cache \
	rpm pkgmgmt delete'
    
    # options (long and short name)
    cmdOpts='--help --version --debug --defaulttty -s --sync -v \
	--verbose --silent --'
    
    cmdMethodOpts='-m -n --context --confdir --lockfile \
	--hostname --netdev --netbcast --netmask \
	--netprefix --interface --cpuset \
	--cpusetcpus --cpusetmems --cpusetvirt \
	--initstyle --flags --help --'
    
    # if the previous option is a single option 
    helpCmds='--help|--version'
    if [[ ${COMP_WORDS[1]} == @($helpCmds) ]] 
    then
	return 0
    fi
    
    # search a verser's name
    for (( i=0; i < ${#COMP_WORDS[@]}-1; i++ ))
    do
	if [[ ${COMP_WORDS[i]} == @($names_pipe) ]]
	then
          # it's found
	    break
	fi
    done
    
	#a vserver has been found 
    if (( $i < ${#COMP_WORDS[@]}-1 )) 
    then 
	#Show the vserver command without build
	case "${COMP_WORDS[i+1]}" in
	    start)
		COMPREPLY=( $( compgen -W "--rescue --rescue-cmd" -- $cur ) )
		;;
	    # No completion for apt-config
	    stop|restart|condrestart|enter|running|status|apt-config|delete)
		;;
	    suexec)
		# I don't know how to do
		COMPREPLY=( $( compgen -W  -- $cur ) )
		;;
	    exec)
		#I don't know how to do
		COMPREPLY=( $( compgen -W "" -- $cur ) )
		;;
	    unify)
		COMPREPLY=( $( compgen -W "-R" -- $cur ) )
		;;
	    apt-get|apt-cache)
		func=${COMP_WORDS[i+1]}
		COMP_WORDS=( ${COMP_WORDS[@]:$((i+1))} )
		COMP_CWORD=$((COMP_CWORD-i-1))
		declare -f _${func//-/_} > /dev/null && _${func//-/_}
		;;
	    *)
		COMPREPLY=( $( compgen -W "$cmds" -- $cur ) )	
		;;
	esac
	return 0
    else
	#no vserver name found
	prev=${COMP_WORDS[COMP_CWORD-1]}
	
	#search the new name of vserver 
	for (( i=0; i < ${#COMP_WORDS[@]}-1; i++ )); do
            if [[ ${COMP_WORDS[i]} == !(vserver|-*) ]];  then
	        # it's found
		break
	    fi
	done
		
	if (( $i < ${#COMP_WORDS[@]}-1 )) ; then 
	    j=$i
	    i=${#COMP_WORDS[@]}
	    for (( ; j < ${#COMP_WORDS[@]}-1; j++ )); do
                if [[ ${COMP_WORDS[j]} == "--" ]];  then
		    # method's parameter
		    case "$method" in
			legacy|copy)
			    ;;
			apt-rpm)
			    COMPREPLY=( $( compgen -W "-d" -- $cur ) )
			    ;;
			yum)
			    COMPREPLY=( $( compgen -W "-d" -- $cur ) )
			    ;;
			rpm) 
			    COMPREPLY=( $( compgen -W "-d --empty --force --nodeps" -- $cur ) )
			    ;;
			skeleton)
			    ;;
			debootstrap)
			    COMPREPLY=( $( compgen -W "-d -m -s --" -- $cur ) )
			    ;;
			*)
                            #do nothing 
                            #the method is not defined
			    ;;
		    esac
                    return 0
                    break
                fi
		if [[ ${COMP_WORDS[j]} == @(build|-m) ]];  then
		    i=$j
		    if (( $j+1 < ${#COMP_WORDS[@]}-1 )) ; then
			method=${COMP_WORDS[j+1]}
		    fi
                fi
            done 
	    
	    if (( $i < ${#COMP_WORDS[@]}-1 )) ; then
		case $prev in
		    --help)
			#do nothing
			;;
		    -n|--context|--confdir|--lockfile|--hostname|--netdev|--netbcast|--netmask|--netprefix|--interface|--cpuset|--cpusetcpus|--cpusetmems|--cpusetvirt|--initstyle|--flags)
			COMPREPLY=( $( compgen -W "" -- $cur ) )
                        ;;
		    -m)
			COMPREPLY=( $( compgen -W "legacy copy apt-rpm yum rpm skeleton debootstrap" -- $cur ) )
			;;
		    *)
			COMPREPLY=( $( compgen -W "$cmdMethodOpts" -- $cur ) )
			;;
		esac
		
	    else
		COMPREPLY=( $( compgen -W "build" -- $cur ) )
	    fi
	else
	    COMPREPLY=( $( compgen -W "${names[@]} $cmdOpts" -- $cur ) )
	fi
	return 0
    fi
    
    return 0
}
complete -F _vserver vserver
_vapt_rpm_yum()
{
    local cur cmds cmdOpts helpCmds names func i
    COMPREPLY=()
    cur=${COMP_WORDS[COMP_CWORD]}
    
    # options (long and short name)
    cmdOpts='--help --version --quiet -q --all'
    
    # if the previous option is a single option 
    helpCmds='--help|--version'
    if [[ "${COMP_WORDS[1]}" == "@($helpCmds)" ]] ; then
	return 0
    fi
    
    # search --
    for (( i=0; i < ${#COMP_WORDS[@]}-1; i++ )); do
        if [[ ${COMP_WORDS[i]} = "--" ]];  then
	    # it's found
	    break
	fi
    done
    
    # find available v-servers: 
    # call function getAllVservers in vserver library
    getAllVservers names
    names_pipe=`echo ${names[@]}" --all" | sed 's/ /|/g'`
    
    if (( $i < ${#COMP_WORDS[@]}-1 )) && (( $i < $COMP_CWORD )) ; then 
	func=${COMP_WORDS[0]:1}
	COMP_WORDS=( $func ${COMP_WORDS[@]:$((i+1))} )
	COMP_CWORD=$((COMP_CWORD-i))
	declare -f _${func//-/_} > /dev/null && _${func//-/_}
    else	
	# search a verser's name
	for (( i=0; i <  ${#COMP_WORDS[@]}-1; i++ )); do
	    if [[ ${COMP_WORDS[i]} == @($names_pipe) ]];  then
		# it's found
		break
	    fi
	done
	if (( $i < ${#COMP_WORDS[@]}-1 )) ; then 
	    if [[ "${COMP_WORDS[i]}" = "--all"  ]]; then
		cmdOpts='--'
		COMPREPLY=( $( compgen -W "$cmdOpts" -- $cur ) )
	    else
		cmdOpts='--'
		COMPREPLY=( $( compgen -W "${names[@]} $cmdOpts" -- $cur ) )
	    fi
	else
	    COMPREPLY=( $( compgen -W "${names[@]} $cmdOpts" -- $cur ) )
	fi
    fi
    return 0
}
complete -F _vapt_rpm_yum vapt-get
complete -F _vapt_rpm_yum vrpm
complete -F _vapt_rpm_yum vyum
_vserver_copy()
{
    local cur prev cmdOpts helpCmds confCmds names names_pipe i
    
    COMPREPLY=()
    cur=${COMP_WORDS[COMP_CWORD]}
    
    # find available v-servers: 
    # call function getAllVservers in vserver library
    getAllVservers names
    names_pipe=`echo ${names[@]} | sed 's/ /|/g'`
    
    # options (long and short name)
    cmdOpts='--help -h --version -V --verbose -v --quiet -q \
		   --vsroot -r --rsh -R --stopstart -s \
		   --domain -d --ip -i'
    
    # if the previous option is a single option 
    helpCmds='--help|-h|--version|-V'
    if [[ ${COMP_WORDS[1]} == @($helpCmds) ]] ; then
	return 0
    fi
    
    confCmds='--ip|-i|--domain|-d'
    prev=${COMP_WORDS[COMP_CWORD-1]}
    if [[ $prev == @($confCmds) ]]; then
	return 0
    fi
    
    # search a verser's name
    for (( i=0; i <  ${#COMP_WORDS[@]}-1; i++ )); do
        if [[ ${COMP_WORDS[i]} == @($names_pipe) ]];  then
	    # it's found
	    break
	fi
    done
    
    if (( $i < ${#COMP_WORDS[@]}-1 )) ; then 
	return 0
    else
	COMPREPLY=( $( compgen -W "${names[@]} $cmdOpts" -- $cur ) )
    fi
    return 0
}
complete -F _vserver_copy vserver-copy
}
}
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