devtools/data/xvfb-run.sh
author David Douard <david.douard@logilab.fr>
Thu, 13 Mar 2014 17:01:13 +0100
changeset 9572 73b2410bdadc
parent 8884 e750e5abd1c7
permissions -rwxr-xr-x
[web] whitespace cleanup in http_headers.py
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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#!/bin/sh
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# This script starts an instance of Xvfb, the "fake" X server, runs a command
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# with that server available, and kills the X server when done.  The return
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# value of the command becomes the return value of this script.
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#
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# If anyone is using this to build a Debian package, make sure the package
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# Build-Depends on xvfb and xauth.
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set -e
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PROGNAME=xvfb-run
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SERVERNUM=99
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AUTHFILE=
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ERRORFILE=/dev/null
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XVFBARGS="-screen 0 640x480x8"
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LISTENTCP="-nolisten tcp"
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XAUTHPROTO=.
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# Query the terminal to establish a default number of columns to use for
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# displaying messages to the user.  This is used only as a fallback in the event
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# the COLUMNS variable is not set.  ($COLUMNS can react to SIGWINCH while the
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# script is running, and this cannot, only being calculated once.)
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DEFCOLUMNS=$(stty size 2>/dev/null | awk '{print $2}') || true
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if ! expr "$DEFCOLUMNS" : "[[:digit:]]\+$" >/dev/null 2>&1; then
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    DEFCOLUMNS=80
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fi
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# Display a message, wrapping lines at the terminal width.
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message () {
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    echo "$PROGNAME: $*" | fmt -t -w ${COLUMNS:-$DEFCOLUMNS}
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}
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# Display an error message.
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error () {
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    message "error: $*" >&2
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}
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# Display a usage message.
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usage () {
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    if [ -n "$*" ]; then
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        message "usage error: $*"
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    fi
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    cat <<EOF
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Usage: $PROGNAME [OPTION ...] COMMAND
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Run COMMAND (usually an X client) in a virtual X server environment.
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Options:
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-a        --auto-servernum          try to get a free server number, starting at
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                                    --server-num
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-e FILE   --error-file=FILE         file used to store xauth errors and Xvfb
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                                    output (default: $ERRORFILE)
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-f FILE   --auth-file=FILE          file used to store auth cookie
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                                    (default: ./.Xauthority)
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-h        --help                    display this usage message and exit
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-n NUM    --server-num=NUM          server number to use (default: $SERVERNUM)
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-l        --listen-tcp              enable TCP port listening in the X server
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-p PROTO  --xauth-protocol=PROTO    X authority protocol name to use
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                                    (default: xauth command's default)
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-s ARGS   --server-args=ARGS        arguments (other than server number and
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                                    "-nolisten tcp") to pass to the Xvfb server
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                                    (default: "$XVFBARGS")
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EOF
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}
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# Find a free server number by looking at .X*-lock files in /tmp.
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find_free_servernum() {
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    # Sadly, the "local" keyword is not POSIX.  Leave the next line commented in
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    # the hope Debian Policy eventually changes to allow it in /bin/sh scripts
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    # anyway.
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    #local i
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    i=$SERVERNUM
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    while [ -f /tmp/.X$i-lock ]; do
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        i=$(($i + 1))
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    done
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    echo $i
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}
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# Clean up files
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clean_up() {
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    if [ -e "$AUTHFILE" ]; then
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        XAUTHORITY=$AUTHFILE xauth remove ":$SERVERNUM" >>"$ERRORFILE" 2>&1
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    fi
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    if [ -n "$XVFB_RUN_TMPDIR" ]; then
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        if ! rm -r "$XVFB_RUN_TMPDIR"; then
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            error "problem while cleaning up temporary directory"
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            exit 5
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        fi
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        XVFB_RUN_TMPDIR=
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    fi
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    if [ -n "$XVFBPID" ]; then
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        kill "$XVFBPID"
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    fi
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}
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# Parse the command line.
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ARGS=$(getopt --options +ae:f:hn:lp:s:w: \
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       --long auto-servernum,error-file:,auth-file:,help,server-num:,listen-tcp,xauth-protocol:,server-args:,wait: \
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       --name "$PROGNAME" -- "$@")
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GETOPT_STATUS=$?
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   102
if [ $GETOPT_STATUS -ne 0 ]; then
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   103
    error "internal error; getopt exited with status $GETOPT_STATUS"
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   104
    exit 6
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   105
fi
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   106
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   107
eval set -- "$ARGS"
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   108
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   109
while :; do
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   110
    case "$1" in
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   111
        -a|--auto-servernum) SERVERNUM=$(find_free_servernum); AUTONUM="yes" ;;
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   112
        -e|--error-file) ERRORFILE="$2"; shift ;;
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   113
        -f|--auth-file) AUTHFILE="$2"; shift ;;
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   114
        -h|--help) SHOWHELP="yes" ;;
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   115
        -n|--server-num) SERVERNUM="$2"; shift ;;
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   116
        -l|--listen-tcp) LISTENTCP="" ;;
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   117
        -p|--xauth-protocol) XAUTHPROTO="$2"; shift ;;
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   118
        -s|--server-args) XVFBARGS="$2"; shift ;;
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   119
        -w|--wait) shift ;;
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   120
        --) shift; break ;;
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   121
        *) error "internal error; getopt permitted \"$1\" unexpectedly"
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   122
           exit 6
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   123
           ;;
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   124
    esac
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   125
    shift
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   126
done
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   127
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   128
if [ "$SHOWHELP" ]; then
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   129
    usage
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   130
    exit 0
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   131
fi
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   132
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   133
if [ -z "$*" ]; then
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   134
    usage "need a command to run" >&2
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   135
    exit 2
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   136
fi
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   137
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   138
if ! which xauth >/dev/null; then
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   139
    error "xauth command not found"
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   140
    exit 3
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   141
fi
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   142
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   143
# tidy up after ourselves
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   144
trap clean_up EXIT TERM
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   145
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   146
# If the user did not specify an X authorization file to use, set up a temporary
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   147
# directory to house one.
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   148
if [ -z "$AUTHFILE" ]; then
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   149
    XVFB_RUN_TMPDIR="$(mktemp -d -t $PROGNAME.XXXXXX)"
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   150
    # Create empty file to avoid xauth warning
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   151
    AUTHFILE=$(tempfile -n "$XVFB_RUN_TMPDIR/Xauthority")
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   152
fi
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   153
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   154
# Start Xvfb.
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   155
MCOOKIE=$(mcookie)
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   156
tries=10
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   157
while [ $tries -gt 0 ]; do
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   158
    tries=$(( $tries - 1 ))
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   159
    XAUTHORITY=$AUTHFILE xauth source - << EOF >>"$ERRORFILE" 2>&1
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   160
add :$SERVERNUM $XAUTHPROTO $MCOOKIE
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   161
EOF
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   162
    # handle SIGUSR1 so Xvfb knows to send a signal when it's ready to accept
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   163
    # connections
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   164
    trap : USR1
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   165
    (trap '' USR1; XAUTHORITY=$AUTHFILE exec Xvfb ":$SERVERNUM" $XVFBARGS $LISTENTCP >>"$ERRORFILE" 2>&1) &
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   166
    XVFBPID=$!
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   167
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   168
    wait || :
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   169
    if kill -0 $XVFBPID 2>/dev/null; then
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   170
        break
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   171
    elif [ -n "$AUTONUM" ]; then
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   172
        # The display is in use so try another one (if '-a' was specified).
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   173
        SERVERNUM=$((SERVERNUM + 1))
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   174
        SERVERNUM=$(find_free_servernum)
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   175
        continue
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   176
    fi
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   177
    error "Xvfb failed to start" >&2
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   178
    XVFBPID=
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   179
    exit 1
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   180
done
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   181
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   182
# Start the command
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   183
DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@" 2>&1 &
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   184
wait $!
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   185
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   186
# vim:set ai et sts=4 sw=4 tw=80: