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#!/bin/sh
# This script starts an instance of Xvfb, the "fake" X server, runs a command
# with that server available, and kills the X server when done. The return
# value of the command becomes the return value of this script.
#
# If anyone is using this to build a Debian package, make sure the package
# Build-Depends on xvfb, xbase-clients, and xfonts-base.
set -e
PROGNAME=xvfb-run
SERVERNUM=99
AUTHFILE=
ERRORFILE=/dev/null
STARTWAIT=3
XVFBARGS="-screen 0 640x480x8"
LISTENTCP="-nolisten tcp"
XAUTHPROTO=.
PATH=$PATH:/usr/bin/X11:/usr/X11R6/bin
# Query the terminal to establish a default number of columns to use for
# displaying messages to the user. This is used only as a fallback in the event
# the COLUMNS variable is not set. ($COLUMNS can react to SIGWINCH while the
# script is running, and this cannot, only being calculated once.)
DEFCOLUMNS=$(stty size 2>/dev/null | awk '{print $2}') || true
if ! expr "$DEFCOLUMNS" : "[[:digit:]]\+$" >/dev/null 2>&1; then
DEFCOLUMNS=80
fi
# Display a message, wrapping lines at the terminal width.
message () {
echo "$PROGNAME: $*" | fmt -t -w ${COLUMNS:-$DEFCOLUMNS}
}
# Display an error message.
error () {
message "error: $*" >&2
}
# Display a usage message.
usage () {
if [ -n "$*" ]; then
message "usage error: $*"
fi
cat <<EOF
Usage: $PROGNAME [OPTION ...] COMMAND
Run COMMAND (usually an X client) in a virtual X server environment.
Options:
-a --auto-servernum try to get a free server number, starting at
--server-num
-e FILE --error-file=FILE file used to store xauth errors and Xvfb
output (default: $ERRORFILE)
-f FILE --auth-file=FILE file used to store auth cookie
(default: ./.Xauthority)
-h --help display this usage message and exit
-n NUM --server-num=NUM server number to use (default: $SERVERNUM)
-l --listen-tcp enable TCP port listening in the X server
-p PROTO --xauth-protocol=PROTO X authority protocol name to use
(default: xauth command's default)
-s ARGS --server-args=ARGS arguments (other than server number and
"-nolisten tcp") to pass to the Xvfb server
(default: "$XVFBARGS")
-w DELAY --wait=DELAY delay in seconds to wait for Xvfb to start
before running COMMAND (default: $STARTWAIT)
EOF
}
# Find a free server number by looking at .X*-lock files in /tmp.
find_free_servernum() {
# Sadly, the "local" keyword is not POSIX. Leave the next line commented in
# the hope Debian Policy eventually changes to allow it in /bin/sh scripts
# anyway.
#local i
i=$SERVERNUM
while [ -f /tmp/.X$i-lock ]; do
i=$(($i + 1))
done
echo $i
}
# Parse the command line.
ARGS=$(getopt --options +ae:f:hn:lp:s:w: \
--long auto-servernum,error-file:auth-file:,help,server-num:,listen-tcp,xauth-protocol:,server-args:,wait: \
--name "$PROGNAME" -- "$@")
GETOPT_STATUS=$?
if [ $GETOPT_STATUS -ne 0 ]; then
error "internal error; getopt exited with status $GETOPT_STATUS"
exit 6
fi
eval set -- "$ARGS"
while :; do
case "$1" in
-a|--auto-servernum) SERVERNUM=$(find_free_servernum) ;;
-e|--error-file) ERRORFILE="$2"; shift ;;
-f|--auth-file) AUTHFILE="$2"; shift ;;
-h|--help) SHOWHELP="yes" ;;
-n|--server-num) SERVERNUM="$2"; shift ;;
-l|--listen-tcp) LISTENTCP="" ;;
-p|--xauth-protocol) XAUTHPROTO="$2"; shift ;;
-s|--server-args) XVFBARGS="$2"; shift ;;
-w|--wait) STARTWAIT="$2"; shift ;;
--) shift; break ;;
*) error "internal error; getopt permitted \"$1\" unexpectedly"
exit 6
;;
esac
shift
done
if [ "$SHOWHELP" ]; then
usage
exit 0
fi
if [ -z "$*" ]; then
usage "need a command to run" >&2
exit 2
fi
if ! which xauth >/dev/null; then
error "xauth command not found"
exit 3
fi
# If the user did not specify an X authorization file to use, set up a temporary
# directory to house one.
if [ -z "$AUTHFILE" ]; then
XVFB_RUN_TMPDIR="${TMPDIR:-/tmp}/$PROGNAME.$$"
if ! mkdir -p -m 700 "$XVFB_RUN_TMPDIR"; then
error "temporary directory $XVFB_RUN_TMPDIR already exists"
exit 4
fi
AUTHFILE=$(tempfile -n "$XVFB_RUN_TMPDIR/Xauthority")
fi
# Start Xvfb.
MCOOKIE=$(mcookie)
XAUTHORITY=$AUTHFILE xauth add ":$SERVERNUM" "$XAUTHPROTO" "$MCOOKIE" \
>"$ERRORFILE" 2>&1
XAUTHORITY=$AUTHFILE Xvfb ":$SERVERNUM" $XVFBARGS $LISTENTCP >"$ERRORFILE" \
2>&1 &
XVFBPID=$!
sleep "$STARTWAIT"
# Start the command and save its exit status.
set +e
DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@" 2>&1
RETVAL=$?
set -e
# Kill Xvfb now that the command has exited.
kill $XVFBPID
# Clean up.
XAUTHORITY=$AUTHFILE xauth remove ":$SERVERNUM" >"$ERRORFILE" 2>&1
if [ -n "$XVFB_RUN_TMPDIR" ]; then
if ! rm -r "$XVFB_RUN_TMPDIR"; then
error "problem while cleaning up temporary directory"
exit 5
fi
fi
# Return the executed command's exit status.
exit $RETVAL
# vim:set ai et sts=4 sw=4 tw=80:
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