snap: build PipeWire from source

This is necessary because we use the core20 base snap, which is built
from Ubuntu 20.04 and therefore doesn't have a recent enough version of
PipeWire available by default.

Change-Id: Id039ec446f4b3f0e89b9ec27f37f81cfd6b3587e

extras/packaging/gnu-linux/docker/Dockerfile_snap

@@ -83,7 +83,6 @@ ENV PATH="/snap/bin:/snap/snapcraft/current/usr/bin:/snap/snapcraft/current/libe
 ENV SNAP="/snap/snapcraft/current"
 ENV SNAP_NAME="snapcraft"
 ENV SNAP_ARCH="amd64"
-ENV DISABLE_PIPEWIRE=true
 
 ADD extras/packaging/gnu-linux/scripts/build-package-snap.sh /opt/build-package-snap.sh
 CMD ["/opt/build-package-snap.sh"]

extras/packaging/gnu-linux/rules/snap/jami/snapcraft.yaml

@@ -138,6 +138,10 @@ apps:
     autostart: jami.desktop
     common-id: net.jami.Jami
     desktop: usr/share/applications/jami.desktop
+    environment:
+      PIPEWIRE_CONFIG_NAME: "$SNAP/usr/share/pipewire/pipewire.conf"
+      PIPEWIRE_MODULE_DIR: "$SNAP/usr/lib/$SNAPCRAFT_ARCH_TRIPLET/pipewire-0.3"
+      SPA_PLUGIN_DIR: "$SNAP/usr/lib/$SNAPCRAFT_ARCH_TRIPLET/spa-0.2"
     slots:
     - dbus-jami
     - dbus-ring
@@ -255,6 +259,8 @@ parts:
       sed -i -E 's|(tmpName) << (PACKAGE_NAME << "_shm_")|\1 << "snap.jami." << \2|' ./daemon/src/media/video/sinkclient.cpp
       sed -i -E 's|^Icon=.*|Icon=${SNAP}/usr/share/icons/hicolor/scalable/apps/jami.svg|' extras/data/jami.desktop
     override-build: |
+      $SNAPCRAFT_PART_BUILD/extras/packaging/gnu-linux/scripts/install-pipewire-from-source.sh
+
       cd $SNAPCRAFT_PART_BUILD/daemon/contrib
       mkdir -p native
       cd native
@@ -304,7 +310,6 @@ parts:
     - libswscale-dev
     - libva-dev
     - libvdpau-dev
-    - libpipewire-0.2-dev
     - libargon2-0-dev # opendht
     - libexpat1-dev
     - libjsoncpp-dev

extras/packaging/gnu-linux/scripts/install-pipewire-from-source.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+# The purpose of this script is to build PipeWire from source in a snap based on core20 / Ubuntu 20.04
+# It must be called in the "override-build" section of the relevant part in snapcraft.yaml
+
+set -e
+
+OLD_WD=$(pwd)
+cd /tmp
+
+# Install PipeWire's build dependencies
+apt-get install --yes gcc git libasound2-dev libdbus-1-dev libglib2.0-dev ninja-build pkg-config
+
+# Get a version of Meson that's recent enough to build PipeWire 1.0.5 (the one available via apt is too old)
+wget -q https://github.com/mesonbuild/meson/releases/download/0.61.1/meson-0.61.1.tar.gz
+echo "feb2cefb325b437dbf36146df7c6b87688ddff0b0205caa31dc64055c6da410c  meson-0.61.1.tar.gz" | sha256sum --check
+tar xzf meson-0.61.1.tar.gz
+
+# Build PipeWire 1.0.5 and install it in the /usr directory of the build environment
+wget -q https://gitlab.freedesktop.org/pipewire/pipewire/-/archive/1.0.5/pipewire-1.0.5.tar.gz
+echo "c5a5de26d684a1a84060ad7b6131654fb2835e03fccad85059be92f8e3ffe993  pipewire-1.0.5.tar.gz" | sha256sum --check
+tar xzf pipewire-1.0.5.tar.gz
+cd pipewire-1.0.5
+../meson-0.61.1/meson.py setup builddir -Dsession-managers=media-session -Dalsa=disabled -Dprefix=/usr
+../meson-0.61.1/meson.py compile -C builddir
+../meson-0.61.1/meson.py install -C builddir
+
+# The files installed by the previous command are only for the "Build" step of the snap
+# creation process (https://snapcraft.io/docs/how-snapcraft-builds). In order to ensure
+# that PipeWire is installed in the final snap archive, we also need to copy all the
+# required files under the $SNAPCRAFT_PART_INSTALL directory.
+../meson-0.61.1/meson.py configure builddir -Dprefix=$SNAPCRAFT_PART_INSTALL/usr/
+../meson-0.61.1/meson.py install -C builddir
+
+# Cleanup
+cd /tmp
+rm -rf meson-0.61.1  meson-0.61.1.tar.gz  pipewire-1.0.5  pipewire-1.0.5.tar.gz
+cd $OLD_WD