User-agent: mu4e 1.4.15; emacs 27.1 (emacs:30177): dbind-WARNING **: 01:46:31.849: Could not open X display http://deb.debian.org/debian/pool/main/x/xorg-server/xorg-server_1.20.10-3.diff.gz +Usage: $PROGNAME [OPTION ...] COMMAND +Options: +DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@" Dear Guix hackers, One of my main tools for running graphical programs as part of my build pipelines is xvfb-run. Since it is not packaged in Guix, I’ve resorted to manual workarounds, but these have annoying drawbacks: Xvfb :3 -screen 0 1024x768x16 & time DISPLAY=:3 HOME=/path/to/project/.emacs.d emacs … I now get errors about the maximum number of clients reached, because the Xvfb does not get reaped after the build: Maximum number of clients reached Therefore I would ask whether it would be possible to package xvfb-run. It is provided as part of the patches of the xorg-package in Debian: The included xvfb-run and xvfb-run.1: --- xorg-server-1.20.10.orig/debian/local/xvfb-run +++ xorg-server-1.20.10/debian/local/xvfb-run @@ -0,0 +1,191 @@ +#!/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 and xauth. + +set -e + +PROGNAME=xvfb-run +SERVERNUM=99 +AUTHFILE= +ERRORFILE=/dev/null +XVFBARGS="-screen 0 1280x1024x24" +LISTENTCP="-nolisten tcp" +XAUTHPROTO=. + +# 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 $2}') || true +case "$DEFCOLUMNS" in + *[!0-9]*|'') DEFCOLUMNS=80 ;; +esac + +# 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: $*" + fi + cat <>"$ERRORFILE" 2>&1 + fi + if [ -n "$XVFB_RUN_TMPDIR" ]; then + if ! rm -r "$XVFB_RUN_TMPDIR"; then + error "problem while cleaning up temporary directory" + exit 5 + fi + fi + if [ -n "$XVFBPID" ]; then + kill "$XVFBPID" >>"$ERRORFILE" 2>&1 + fi +} + +# Parse the command line. +ARGS=$(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); AUTONUM="yes" ;; + -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) shift ;; + --) shift; break ;; + *) error "internal error; getopt permitted \"$1\" unexpectedly" + exit 6 + ;; + esac + shift +done + +if [ "$SHOWHELP" ]; then + usage + exit 0 +fi + +if [ -z "$*" ]; then + usage "need a command to run" >&2 + exit 2 +fi + +if ! command -v xauth >/dev/null; then + error "xauth command not found" + exit 3 +fi + +# tidy up after ourselves +trap clean_up EXIT + +# If the user did not specify an X authorization file to use, set up a temporary +# directory to house one. +if [ -z "$AUTHFILE" ]; then + XVFB_RUN_TMPDIR="$(mktemp -d -t $PROGNAME.XXXXXX)" + AUTHFILE="$XVFB_RUN_TMPDIR/Xauthority" + # Create empty file to avoid xauth warning + touch "$AUTHFILE" +fi + +# Start Xvfb. +MCOOKIE=$(mcookie) +tries=10 +while [ $tries -gt 0 ]; do + tries=$(( $tries - 1 )) + XAUTHORITY=$AUTHFILE xauth source - << EOF >>"$ERRORFILE" 2>&1 +add :$SERVERNUM $XAUTHPROTO $MCOOKIE +EOF + # handle SIGUSR1 so Xvfb knows to send a signal when it's ready to accept + # connections + trap : USR1 + (trap '' USR1; exec Xvfb ":$SERVERNUM" $XVFBARGS $LISTENTCP -auth $AUTHFILE >>"$ERRORFILE" 2>&1) & + XVFBPID=$! + + wait || : + if kill -0 $XVFBPID 2>/dev/null; then + break + elif [ -n "$AUTONUM" ]; then + # The display is in use so try another one (if '-a' was specified). + SERVERNUM=$((SERVERNUM + 1)) + SERVERNUM=$(find_free_servernum) + continue + fi + error "Xvfb failed to start" >&2 + XVFBPID= + exit 1 +done + +# Start the command and save its exit status. +set +e +RETVAL=$? +set -e + +# Return the executed command's exit status. +exit $RETVAL + +# vim:set ai et sts=4 sw=4 tw=80: --- xorg-server-1.20.10.orig/debian/local/xvfb-run.1 +++ xorg-server-1.20.10/debian/local/xvfb-run.1 @@ -0,0 +1,275 @@ +.\" Copyright 1998-2004 Branden Robinson . +.\" +.\" This is free software; you may 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 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 with +.\" the Debian operating system, in /usr/share/common-licenses/GPL; if +.\" not, write to the Free Software Foundation, Inc., 59 Temple Place, +.\" Suite 330, Boston, MA 02111-1307 USA +.\" +.\" We need the URL macro from groff's www macro package, but also want +.\" things to work all right for people who don't have it. So we define +.\" our own URL macro and let the www macro package override it if it's +.\" available. +.de URL +\\$2 \(laURL: \\$1 \(ra\\$3 +.. +.if \n[.g] .mso www.tmac +.TH xvfb\-run 1 "2004\-11\-12" "Debian Project" +.SH NAME +xvfb\-run \- run specified X client or command in a virtual X server environment +.SH SYNOPSIS +.B xvfb\-run +[ +.I options +] +.I command +.SH DESCRIPTION +.B xvfb\-run +is a wrapper for the +.BR Xvfb (1x) +command which simplifies the task of running commands (typically an X +client, or a script containing a list of clients to be run) within a virtual +X server environment. +.PP +.B xvfb\-run +sets up an X authority file (or uses an existing user\-specified one), +writes a cookie to it (see +.BR xauth (1x)) +and then starts the +.B Xvfb +X server as a background process. +The process ID of +.B Xvfb +is stored for later use. +The specified +.I command +is then run using the X display corresponding to the +.B Xvfb +server +just started and the X authority file created earlier. +.PP +When the +.I command +exits, its status is saved, the +.B Xvfb +server is killed (using the process ID stored earlier), the X authority +cookie removed, and the authority file deleted (if the user did not specify +one to use). +.B xvfb\-run +then exits with the exit status of +.IR command . +.PP +.B xvfb\-run +requires the +.B xauth +command to function. +.SH OPTIONS +.TP +.B \-a\fR,\fB \-\-auto\-servernum +Try to get a free server number, starting at 99, or the argument to +.BR \-\-server\-num . +.TP +.BI \-e\ file \fR,\fB\ \-\-error\-file= file +Store output from +.B xauth +and +.B Xvfb +in +.IR file . +The default is +.IR /dev/null . +.TP +.BI \-f\ file \fR,\fB\ \-\-auth\-file= file +Store X authentication data in +.IR file . +By default, a temporary directory called +.IR xvfb\-run. PID +(where PID is the process ID of +.B xvfb\-run +itself) is created in the directory specified by the environment variable +.B TMPDIR +(or +.I /tmp +if that variable is null or unset), and the +.BR tempfile (1) +command is used to create a file in that temporary directory called +.IR Xauthority . +.TP +.B \-h\fR,\fB \-\-help +Display a usage message and exit. +.TP +.BI \-n\ servernumber \fR,\fB\ \-\-server\-num= servernumber +Use +.I servernumber +as the server number (but see the +.B \-a\fR,\fB \-\-auto\-servernum +option above). +The default is 99. +.TP +.B \-l\fR,\fB \-\-listen\-tcp +Enable TCP port listening in the X server. +For security reasons (to avoid denial\-of\-service attacks or exploits), +TCP port listening is disabled by default. +.TP +.BI \-p\ protocolname \fR,\fB\ \-\-xauth\-protocol= protocolname +Use +.I protocolname +as the X authority protocol to use. +The default is \(oq.\(cq, which +.B xauth +interprets as its own default protocol, which is MIT\-MAGIC\-COOKIE\-1. +.TP +.BI \-s\ arguments \fR,\fB\ \-\-server\-args= arguments +Pass +.I arguments +to the +.B Xvfb +server. +Be careful to quote any whitespace characters that may occur within +.I arguments +to prevent them from regarded as separators for +.BR xvfb\-run 's +own arguments. +Also, note that specification of \(oq\-nolisten tcp\(cq in +.I arguments +may override the function of +.BR xvfb\-run 's +own +.B \-l\fR,\fB \-\-listen\-tcp +option, and that specification of the server number (e.g., \(oq:1\(cq) may +be ignored because of the way the X server parses its argument list. +Use the +.B xvfb\-run +option +.BI \-n\ servernumber \fR,\fB\ \-\-server\-num= servernumber +to achieve the latter function. +The default is \(oq\-screen 0 1280x1024x24\(cq. +.TP +.BI \-w\ delay \fR,\fB\ \-\-wait= delay +Ignored for compatibility with earlier versions. +.SH ENVIRONMENT +.TP +.B COLUMNS +indicates the width of the terminal device in character cells. +This value is used for formatting diagnostic messages. +If not set, the terminal is queried using +.BR stty (1) +to determine its width. +If that fails, a value of \(oq80\(cq is assumed. +.TP +.B TMPDIR +specifies the directory in which to place +.BR xvfb\-run 's +temporary directory for storage of the X authority file; only used if the +.B \-f +or +.B \-\-auth\-file +options are not specified. +.SH "OUTPUT FILES" +.PP +Unless the +.B \-f +or +.B \-\-auth\-file +options are specified, a temporary +directory and file within it are created (and deleted) to store the X +authority cookies used by the +.B Xvfb +server and client(s) run under it. +See +.BR tempfile (1). +If \-f or \-\-auth\-file are used, then the specified X authority file is +only written to, not created or deleted (though +.B xauth +creates an authority file itself if told to use use that does not already +exist). +.PP +An error file with a user\-specified name is also created if the +.B \-e +or +.B \-\-error\-file +options are specified; see above. +.SH "EXIT STATUS" +.B xvfb\-run +uses its exit status as well as output to standard error to communicate +diagnostics. +The exit status of \(oq1\(cq is not used, and should be interpreted as failure +of the specified command. +.TP +0 +.B xvfb\-run +only uses this exit status if the +.B \-h\fR,\fB \-\-help +option is given. +In all other situations, this may be interpreted as success of the specified +command. +.TP +2 +No command to run was specified. +.TP +3 +The +.B xauth +command is not available. +.TP +4 +The temporary directory that was going to be used already exists; since +.B xvfb\-run +produces a uniquely named directory, this may indicate an attempt by another +process on the system to exploit a temporary file race condition. +.TP +5 +A problem was encountered while cleaning up the temporary directory. +.TP +6 +A problem was encountered while using +.BR getopt (1) +to parse the command\-line arguments. +.SH EXAMPLES +.TP +.B xvfb\-run \-\-auto\-servernum \-\-server\-num=1 xlogo +runs the +.BR xlogo (1x) +demonstration client inside the +.B Xvfb +X server on the first available server number greater than or equal to 1. +.TP +.B xvfb\-run \-\-server\-args="\-screen 0 1024x768x24" ico \-faces +runs the +.BR ico (1x) +demonstration client (and passes it the +.B \-faces +argument) inside the +.B Xvfb +X server, configured with a root window of 1024 by 768 pixels and a color +depth of 24 bits. +.PP +Note that the demo X clients used in the above examples will not exit on +their own, so they will have to be killed before +.B xvfb\-run +will exit. +.SH BUGS +See +.URL "https://bugs.debian.org/xvfb" "the Debian Bug Tracking System" . +If you wish to report a bug in +.BR xvfb\-run , +please use the +.BR reportbug (1) +command. +.SH AUTHOR +.B xvfb\-run +was written by Branden Robinson and Jeff Licquia with sponsorship from +Progeny Linux Systems. +.SH "SEE ALSO" +.BR Xvfb (1x), +.BR xauth (1x) +.\" vim:set et tw=80: Best wishes, Arne -- Unpolitisch sein heißt politisch sein ohne es zu merken Date: Mon, 08 Mar 2021 01:57:32 +0100 Message-ID: <87im62fon7.fsf@web.de>