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#!/bin/sh
#
# xrdp: A Remote Desktop Protocol server.
#
# Copyright (C) 2021 Matt Burt, all xrdp contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Wrapper to call install_pulseaudio_sources.sh and tidy up afterwards
#
# The following command line switches are supported, for systems based on
# Debian or Ubuntu:-
#
# 1) --mirror= Specify an alternative mirror for debootstrap
# 2) --keyring= Specify an alternative keyring for debootstrap
# 3) --suite= Specify an alternative suite for debootstrap
#
# The first two of these are are needed for systems with their own
# mirrors and signing keys (i.e. Raspberry PI OS).
#
# --suite is useful for systems which report their own codename for
# `lsb_release -c`, but are otherwise based on a standard distro. For
# example Linux Mint 20.04 reports 'una', but is largely based on
# Ubuntu 'focal'
# ---------------------------------------------------------------------------
# G L O B A L S
# ---------------------------------------------------------------------------
# Where the output files are going
PULSE_DIRNAME=pulseaudio.src
PULSE_DIR=$HOME/$PULSE_DIRNAME
# Absolute path to the script we're wrapping. This picks it up from
# the same directory this file is in
WRAPPED_SCRIPT=$(cd $(dirname $0) && pwd)/install_pulseaudio_sources_apt.sh
# The buildroot directory. Choose fast, temporary storage if available
BUILDROOT=/var/lib/pa-build/$USER
# Extra packages to install in the build root which the wrapped script
# may be using. These are packages available by default when using
# GitHub actions
WRAPPED_SCRIPT_DEPS="sudo lsb-release"
# -----------------------------------------------------------------------------
# S U I T E E X I S T S
#
# Does the specified debootstrap suite exist?
# -----------------------------------------------------------------------------
SuiteExists()
{
[ -f "/usr/share/debootstrap/scripts/$1" ]
}
# -----------------------------------------------------------------------------
# I N S T A L L R E Q U I R E D P A C K A G E S
#
# Installs packages required for the build on the host machine
# -----------------------------------------------------------------------------
InstallRequiredPackages()
{
set -- \
/usr/sbin/debootstrap debootstrap \
/usr/bin/schroot schroot \
/usr/bin/lsb_release lsb-release
pkgs=
while [ $# -ge 2 ]; do
if [ ! -x $1 ]; then
pkgs="$pkgs $2"
fi
shift 2
done
if [ -n "$pkgs" ]; then
echo "- Need to install packages :$pkgs"
echo
echo " These can be removed when this script completes with:-"
echo " sudo apt-get purge$pkgs && apt-get autoremove"
echo
sudo apt-get install -y $pkgs
fi
}
# -----------------------------------------------------------------------------
# R U N W R A P P E D S C R I P T
#
# Runs the wrapped build script using schroot
#
# This function definition uses () rather than {} to create an extra
# sub-process where we can run 'set -e' without affecting the parent
#
# Parameters : <script> [<script params>...]
# -----------------------------------------------------------------------------
RunWrappedScript()
(
# In this sub-process, fail on error
set -e
# Define default args for running program
# -c : Define the schroot config to use
# -d : Directory to switch to before running command
schroot="schroot -c pa-build-$USER -d /build"
# Install extra dependencies
$schroot -u root -- apt-get install -y $WRAPPED_SCRIPT_DEPS
# Allow normal user to sudo without a password
$schroot -u root -- \
/bin/sh -c "echo '$USER ALL=(ALL) NOPASSWD:ALL'>/etc/sudoers.d/nopasswd-$USER"
$schroot -u root -- chmod 400 /etc/sudoers.d/nopasswd-$USER
# Call the wrapped script
$schroot -- "$@"
)
# -----------------------------------------------------------------------------
# M A I N
# -----------------------------------------------------------------------------
debootstrap_mirror=""
debootstrap_switches=""
debootstrap_suite=""
# Parse command line switches
while [ -n "$1" ]; do
case "$1" in
--mirror=*)
debootstrap_mirror="${1#--mirror=}"
;;
--keyring=*)
file="${1#--keyring=}"
if [ -f "$file" ]; then
debootstrap_switches="$debootstrap_switches $1"
else
echo "** Ignoring missing keyring $1" >&2
fi
;;
--suite=*)
debootstrap_suite="${1#--suite=}"
if ! SuiteExists "$debootstrap_suite"; then
echo "** Unsupported suite '$debootstrap_suite'" >&2
exit 1
fi
;;
*) echo "** Unrecognised parameter '$1'" >&2
exit 1
esac
shift
done
# Start with a few sanity checks
if [ -d $PULSE_DIR ]; then
echo "** Target directory $PULSE_DIR already exists" >&2
exit 0
fi
if [ ! -x $WRAPPED_SCRIPT ]; then
echo "** Can't find wrapped script $WRAPPED_SCRIPT" >&2
exit 1
fi
if [ -e $BUILDROOT ]; then
echo "** Remove old build root $BUILDROOT before running this script"
exit 1
fi
# Do we need extra packages?
InstallRequiredPackages || exit $?
# We should be able to determine the suite now, if it's not specified
if [ -z "$debootstrap_suite" ]; then
debootstrap_suite=$(lsb_release -cs) ; # e.g. 'bullseye'
if [ -z "$debootstrap_suite" ]; then
echo "** Can't determine current suite" >&2
exit 1
fi
if ! SuiteExists "$debootstrap_suite" ; then
echo "** Current distro '$debootstrap_suite' does not appear to be supported by debootstrap" >&2
echo " Need --suite switch?" >&2
exit 1
fi
fi
# Create the build root
log=/var/tmp/pa-build-$USER-debootstrap.log
echo "- Creating $debootstrap_suite build root. Log file in $log"
sudo debootstrap \
$debootstrap_switches \
$debootstrap_suite $BUILDROOT "$debootstrap_mirror" >$log 2>&1 || {
echo "** debootstrap failed. Check log file $log" >&2
exit 1
}
# Create the config file for schroot
schroot_conf=/etc/schroot/chroot.d/pa-build-$USER.conf
echo "- Creating schroot config file $schroot_conf"
{
echo "[pa-build-$USER]"
echo "description=Build PA on current system for $USER"
echo "directory=$BUILDROOT"
echo "root-users=$USER"
echo "users=$USER"
echo "type=directory"
} | sudo tee $schroot_conf >/dev/null || exit $?
# Copy some files to the build root
for file in /etc/apt/sources.list; do
echo "- Copying $file to the root"
sudo install -m 0644 $file $BUILDROOT/$file || exit $?
done
# Create a separate directory in $BUILDROOT to hold the build
# artefacts.
#
# We used to do the build on the user's home directory, but this
# isn't supported by schroot out-of-the-box on all configurations -
# see https://github.com/neutrinolabs/pulseaudio-module-xrdp/issues/76
echo "- Creating the build directory /build"
sudo install -d --mode=0775 --owner=$USER --group=$(id -g) \
$BUILDROOT/build || exit $?
# Copy the wrapped script to the buildroot root
echo "- Copying the wrapped script to the build directory"
sudo install -m 755 $WRAPPED_SCRIPT $BUILDROOT/build/wrapped_script || exit $?
# Run the wrapped script
log=/var/tmp/pa-build-$USER-schroot.log
echo "- Building PA sources. Log file in $log"
RunWrappedScript /build/wrapped_script -d /build/$PULSE_DIRNAME >$log 2>&1 || {
echo "** schroot failed. Check log file $log" >&2
exit 1
}
# Done! Copy the resulting directory out of the build root
echo "- Copying sources out of the build root"
cp -pr $BUILDROOT/build/$PULSE_DIRNAME $PULSE_DIR || exit $?
# Remove the schroot config file as its no longer needed
echo "- Removing schroot config file and build root"
sudo rm -rf $schroot_conf $BUILDROOT
echo "- All done. Configure PA xrdp module with PULSE_DIR=$PULSE_DIR"
exit 0