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# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: virtualx.eclass
# @MAINTAINER:
# x11@gentoo.org
# @AUTHOR:
# Original author: Martin Schlemmer <azarah@gentoo.org>
# @SUPPORTED_EAPIS: 6 7 8
# @BLURB: This eclass can be used for packages that need a working X environment to build.
case ${EAPI} in
6|7|8) ;;
*) die "${ECLASS}: EAPI ${EAPI:-0} is not supported." ;;
esac
if [[ ! ${_VIRTUALX_ECLASS} ]]; then
_VIRTUALX_ECLASS=1
# @ECLASS-VARIABLE: VIRTUALX_REQUIRED
# @PRE_INHERIT
# @DESCRIPTION:
# Variable specifying the dependency on xorg-server and xhost.
# Possible special values are "always" and "manual", which specify
# the dependency to be set unconditionaly or not at all.
# Any other value is taken as useflag desired to be in control of
# the dependency (eg. VIRTUALX_REQUIRED="kde" will add the dependency
# into "kde? ( )" and add kde into IUSE.
: ${VIRTUALX_REQUIRED:=test}
# @ECLASS-VARIABLE: VIRTUALX_DEPEND
# @OUTPUT_VARIABLE
# @DESCRIPTION:
# Standard dependencies string that is automatically added to BDEPEND
# (in EAPI-6: DEPEND) unless VIRTUALX_REQUIRED is set to "manual".
# DEPRECATED: Pre-EAPI-8 you can specify the variable BEFORE inherit
# to add more dependencies.
[[ ${EAPI} != [67] ]] && VIRTUALX_DEPEND=""
VIRTUALX_DEPEND+="
x11-base/xorg-server[xvfb]
x11-apps/xhost
"
[[ ${EAPI} != [67] ]] && readonly VIRTUALX_DEPEND
[[ ${VIRTUALX_COMMAND} ]] && die "VIRTUALX_COMMAND has been removed and is a no-op"
case ${VIRTUALX_REQUIRED} in
manual)
;;
always)
BDEPEND="${VIRTUALX_DEPEND}"
;;
*)
BDEPEND="${VIRTUALX_REQUIRED}? ( ${VIRTUALX_DEPEND} )"
IUSE="${VIRTUALX_REQUIRED}"
[[ ${VIRTUALX_REQUIRED} == test ]] &&
RESTRICT+=" !test? ( test )"
;;
esac
[[ ${EAPI} == 6 ]] && DEPEND="${BDEPEND}"
# @FUNCTION: virtx
# @USAGE: <command> [command arguments]
# @DESCRIPTION:
# Start new Xvfb session and run commands in it.
#
# IMPORTANT: The command is run nonfatal !!!
#
# This means we are checking for the return code and raise an exception if it
# isn't 0. So you need to make sure that all commands return a proper
# code and not just die. All eclass function used should support nonfatal
# calls properly.
#
# The rational behind this is the tear down of the started Xfvb session. A
# straight die would leave a running session behind.
#
# Example:
#
# @CODE
# src_test() {
# virtx default
# }
# @CODE
#
# @CODE
# python_test() {
# virtx py.test --verbose
# }
# @CODE
#
# @CODE
# my_test() {
# some_command
# return $?
# }
#
# src_test() {
# virtx my_test
# }
# @CODE
virtx() {
debug-print-function ${FUNCNAME} "$@"
[[ $# -lt 1 ]] && die "${FUNCNAME} needs at least one argument"
local i=0
local retval=0
local OLD_SANDBOX_ON="${SANDBOX_ON}"
local XVFB XHOST XDISPLAY
local xvfbargs="-screen 0 1280x1024x24 +extension RANDR"
XVFB=$(type -p Xvfb) || die
XHOST=$(type -p xhost) || die
debug-print "${FUNCNAME}: running Xvfb hack"
export XAUTHORITY=
# The following is derived from Mandrake's hack to allow
# compiling without the X display
einfo "Scanning for an open DISPLAY to start Xvfb ..."
# If we are in a chrooted environment, and there is already a
# X server started outside of the chroot, Xvfb will fail to start
# on the same display (most cases this is :0 ), so make sure
# Xvfb is started, else bump the display number
#
# Azarah - 5 May 2002
# GNOME GDM may have started X on DISPLAY :0 with a
# lock file /tmp/.X1024-lock, therefore start the search at 1.
# Else a leftover /tmp/.X1-lock will prevent finding an available display.
XDISPLAY=$(i=1; while [[ -f /tmp/.X${i}-lock ]] ; do ((i++));done; echo ${i})
debug-print "${FUNCNAME}: XDISPLAY=${XDISPLAY}"
# We really do not want SANDBOX enabled here
export SANDBOX_ON="0"
debug-print "${FUNCNAME}: ${XVFB} :${XDISPLAY} ${xvfbargs}"
${XVFB} :${XDISPLAY} ${xvfbargs} &>/dev/null &
sleep 2
local start=${XDISPLAY}
while [[ ! -f /tmp/.X${XDISPLAY}-lock ]]; do
# Stop trying after 15 tries
if ((XDISPLAY - start > 15)) ; then
eerror "'${XVFB} :${XDISPLAY} ${xvfbargs}' returns:"
echo
${XVFB} :${XDISPLAY} ${xvfbargs}
echo
eerror "If possible, correct the above error and try your emerge again."
die "Unable to start Xvfb"
fi
((XDISPLAY++))
debug-print "${FUNCNAME}: ${XVFB} :${XDISPLAY} ${xvfbargs}"
${XVFB} :${XDISPLAY} ${xvfbargs} &>/dev/null &
sleep 2
done
# Now enable SANDBOX again if needed.
export SANDBOX_ON="${OLD_SANDBOX_ON}"
einfo "Starting Xvfb on \$DISPLAY=${XDISPLAY} ..."
export DISPLAY=:${XDISPLAY}
# Do not break on error, but setup $retval, as we need
# to kill Xvfb
debug-print "${FUNCNAME}: $@"
nonfatal "$@"
retval=$?
# Now kill Xvfb
kill $(cat /tmp/.X${XDISPLAY}-lock)
# die if our command failed
[[ ${retval} -ne 0 ]] && die "Failed to run '$@'"
return 0 # always return 0, it can be altered by failed kill for Xvfb
}
fi
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