#!/bin/sh -e

# Copyright (c) 2015 The crouton Authors. All rights reserved.

# Use of this source code is governed by a BSD-style license that can be

# found in the LICENSE file.

REQUIRES='core'

DESCRIPTION='Support audio playback via Chromium OS'\''s audio system.'

CHROOTBIN='volume'

CHROOTETC='pulseaudio-default.pa'

. "${TARGETSDIR:="$PWD"}/common"

### Append to prepare.sh:

# Fetch CRAS source

CRASBUILDTMP="`mktemp -d crouton-cras.XXXXXX --tmpdir=/tmp`"

addtrap "rm -rf --one-file-system '$CRASBUILDTMP'"

# ADHD_HEAD is normally autodetected, but it can be set manually using a custom

# target sourced before this one (used for automated testing)

# The custom target also needs to set CROS_VER_1

if [ -z "$ADHD_HEAD" ]; then

# Chrome OS version (e.g. 4100.86.0)

CROS_VER="`sed -n 's/^CHROMEOS_RELEASE_VERSION=//p' /var/host/lsb-release`"

# Set CROS_VER_1 to the major version number (e.g. 4100), used later on to

# selectively apply patches.

CROS_VER_1="${CROS_VER%%.*}"

cras_version="`cat /var/host/cras-version 2>/dev/null || true`"

ADHD_HEAD="${cras_version##*-}"

# Make sure ADHD_HEAD looks like a commit id

if [ "${#ADHD_HEAD}" -ne 40 -o "${head%[^0-9a-f]*}" != "$head" ]; then

echo "Empty or invalid cras-version (${cras_version})." 1>&2

ADHD_HEAD=""

fi

fi

# TODO: Remove autodetection code (not needed since build 6276)

if [ -z "$ADHD_HEAD" ]; then

# Fetch list of branches from repository

wget -O "$CRASBUILDTMP/adhd.refs" \

'https://chromium.googlesource.com/chromiumos/third_party/adhd/+refs/heads?format=TEXT'

echo "Detecting CRAS branch (Chromium OS build $CROS_VER)..." 1>&2

ADHD_HEAD="`awk '

BEGIN {

len = split("'"$CROS_VER"'", crosvers, ".")

# Prepare a regex with each additional version component optional

for (i = len; i >= 2; i--)

verregex = "(\\\\." crosvers[i] verregex ")?"

verregex = crosvers[1] verregex "($|\\\\.)"

}

# Release branches get the highest score

$2 ~ "release-(R[^-]*-)?" crosvers[1] "($|\\\\.)" {

print 99, $2

}

# Stabilize branches are scored based on how much of the version they match

match($2, "stabilize-" verregex) {

print RLENGTH, $2

}

' "$CRASBUILDTMP/adhd.refs" | sort -V | tail -n 1 | cut -d' ' -f2`"

# If no branch can be found, fall back on manifests. This should only be

# needed on dev or canary channel, and this cannot be used on stable/beta,

# as additional patches may be added to the git branch.

if [ -z "$ADHD_HEAD" ]; then

echo "No CRAS branch found, falling back on manifests..." 1>&2

MANIFEST_GIT="https://chromium.googlesource.com/chromiumos/manifest-versions/+/master/chrome-LKGM-candidates"

# Get the list of releases (e.g. 35). Only last 2 should be required.

majorlist="`wget -O- "$MANIFEST_GIT/buildspecs" \

| tr '>' '\n' | sed -n 's|^\([0-9]*\)/<.*|\1|p' \

| sort -n -r | head -n 2`"

for major in $majorlist; do

# Get the latest manifest for the current build

manifest="`wget -O- "$MANIFEST_GIT/buildspecs/$major" \

| sed -n 's/.*\('"$CROS_VER_1"'.0.0-rc[0-9]*.xml\).*/\1/p'`"

if [ -n "$manifest" ]; then

# Fetch git commit id

ADHD_HEAD="`wget -O- \

"$MANIFEST_GIT/buildspecs/$major/$manifest?format=TEXT" \

| base64 -d \

| sed -n 's|.*path="src/third_party/adhd".* revision="\([0-9a-f]*\)".*|\1|p'`"

break

fi

done

fi

if [ -z "$ADHD_HEAD" ]; then

echo "Cannot figure out CRAS branch or commit ID." 1>&2

exit 1

fi

fi

echo "Fetching CRAS (branch $ADHD_HEAD)..." 1>&2

# Try to download the CRAS commit id first, and fall back on master if that is

# not found (see crbug.com/417820).

archive="$CRASBUILDTMP/adhd.tar.gz"

log="$CRASBUILDTMP/wget.log"

urlbase="https://chromium.googlesource.com/chromiumos/third_party/adhd/+archive"

( wget -O "$archive" "$urlbase/$ADHD_HEAD.tar.gz" 2>&1 \

|| echo "Error fetching CRAS" ) | tee "$log"

if tail -n 1 "$log" | grep -q "^Error"; then

if grep -q "404 Not Found" "$log" 2>/dev/null; then

echo "Branch not found, falling back on master (audio might not work)..." 1>&2

ADHD_HEAD="master"

wget -O "$archive" "$urlbase/$ADHD_HEAD.tar.gz"

else

# wget already printed an explicit error

exit 1

fi

fi

# Build CRAS ALSA plugin for the given architecture ($1)

# A blank parameter means we are building for the native architecture.

build_cras() {

}

# On x86_64, the ALSA plugin needs to be compiled for both 32-bit and 64-bit

# to allow audio playback using 32-bit applications.

if [ "$ARCH" = 'amd64' ]; then

build_cras 'i386'

fi

# Build CRAS for native architecture

build_cras

cat > /usr/share/alsa/alsa.conf.d/10-cras.conf <<EOF

pcm.cras {

type cras

hint {

show on

description "Chromium OS Audio Server"

}

}

ctl.cras {

type cras

}

# Default: route all audio through the CRAS plugin.

pcm.!default {

type cras

hint {

show on

description "Default ALSA Output (currently Chromium OS Audio Server)"

}

}

ctl.!default {

type cras

}

EOF

# Configure pulseaudio even if it is not installed (yet).

# We use ~/.config/pulse/default.pa for this purpose, but the main user may

# not have been created yet, so we add a script in /etc/profile.d to link

# ~/.config/pulse/default.pa to /etc/crouton/pulseaudio-default.pa.

paconfigdir='$HOME/.config/pulse'

# Old versions of pulseaudio use ~/.pulse/default.pa

if release -le quantal -le wheezy; then

paconfigdir='$HOME/.pulse'

fi

profiledsh='/etc/profile.d/crouton-pulseaudio-cras.sh'

# Make sure symbolic link is setup on login

echo '#!/bin/sh

defaultpa="'"$paconfigdir"'/default.pa"

# Do not install if user is root, or $HOME does not exist

if [ "`id -u`" -ne 0 -a -d "$HOME" -a ! -e "$defaultpa" ]; then

mkdir -p "'"$paconfigdir"'"

ln -sfT /etc/crouton/pulseaudio-default.pa "$defaultpa"

fi' > "$profiledsh"

chmod 755 "$profiledsh"

TIPS="$TIPS

Audio from the chroot will now be forwarded to CRAS (Chromium OS audio server),

through an ALSA plugin.

Future Chromium OS upgrades may break compatibility with the installed version

of CRAS. Should this happen, simply update your chroot.

"