author | Rémi Cardona <remi.cardona@logilab.fr> |
Tue, 15 Sep 2015 15:08:04 +0200 | |
changeset 10673 | 9924fd69bcba |
parent 8884 | e750e5abd1c7 |
permissions | -rwxr-xr-x |
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1 |
#!/bin/sh |
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2 |
|
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3 |
# This script starts an instance of Xvfb, the "fake" X server, runs a command |
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4 |
# with that server available, and kills the X server when done. The return |
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5 |
# value of the command becomes the return value of this script. |
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6 |
# |
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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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9 |
|
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10 |
set -e |
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11 |
|
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12 |
PROGNAME=xvfb-run |
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13 |
SERVERNUM=99 |
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14 |
AUTHFILE= |
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15 |
ERRORFILE=/dev/null |
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16 |
XVFBARGS="-screen 0 640x480x8" |
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17 |
LISTENTCP="-nolisten tcp" |
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XAUTHPROTO=. |
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19 |
|
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20 |
# 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:]]\+$" >/dev/null 2>&1; then |
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DEFCOLUMNS=80 |
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27 |
fi |
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28 |
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# Display a message, wrapping lines at the terminal width. |
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message () { |
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echo "$PROGNAME: $*" | fmt -t -w ${COLUMNS:-$DEFCOLUMNS} |
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32 |
} |
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33 |
|
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34 |
# Display an error message. |
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error () { |
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message "error: $*" >&2 |
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} |
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38 |
|
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39 |
# Display a usage message. |
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40 |
usage () { |
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if [ -n "$*" ]; then |
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message "usage error: $*" |
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43 |
fi |
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44 |
cat <<EOF |
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45 |
Usage: $PROGNAME [OPTION ...] COMMAND |
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Run COMMAND (usually an X client) in a virtual X server environment. |
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47 |
Options: |
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48 |
-a --auto-servernum try to get a free server number, starting at |
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49 |
--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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53 |
(default: ./.Xauthority) |
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54 |
-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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62 |
EOF |
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63 |
} |
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64 |
|
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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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71 |
|
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72 |
i=$SERVERNUM |
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while [ -f /tmp/.X$i-lock ]; do |
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74 |
i=$(($i + 1)) |
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75 |
done |
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echo $i |
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} |
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78 |
|
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# Clean up files |
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clean_up() { |
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81 |
if [ -e "$AUTHFILE" ]; then |
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82 |
XAUTHORITY=$AUTHFILE xauth remove ":$SERVERNUM" >>"$ERRORFILE" 2>&1 |
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83 |
fi |
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84 |
if [ -n "$XVFB_RUN_TMPDIR" ]; then |
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if ! rm -r "$XVFB_RUN_TMPDIR"; then |
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error "problem while cleaning up temporary directory" |
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87 |
exit 5 |
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88 |
fi |
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XVFB_RUN_TMPDIR= |
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90 |
fi |
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if [ -n "$XVFBPID" ]; then |
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92 |
kill "$XVFBPID" |
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93 |
fi |
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94 |
} |
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95 |
|
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96 |
# Parse the command line. |
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97 |
ARGS=$(getopt --options +ae:f:hn:lp:s:w: \ |
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98 |
--long auto-servernum,error-file:,auth-file:,help,server-num:,listen-tcp,xauth-protocol:,server-args:,wait: \ |
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99 |
--name "$PROGNAME" -- "$@") |
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100 |
GETOPT_STATUS=$? |
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101 |
|
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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: |