Add support for Buster in the installer

Vagrantfile

@@ -59,6 +59,12 @@ Vagrant.configure("2") do |config|
     os.vm.box = "bento/debian-9.6"
     provision_libretime(os, "debian.sh", installer_args)
   end
+  config.vm.define "debian-buster" do |os|
+    # TODO: Replace with generic/debian10 once it is released
+    os.vm.box = "fujimakishouten/debian-buster64"
+    # TODO: Remove the manual flags after buster is released
+    provision_libretime(os, "debian.sh", installer_args + "--distribution=debian --release=buster")
+  end
   config.vm.define "centos" do |os|
     os.vm.box = 'centos/7'
     provision_libretime(os, "centos.sh", installer_args + "--selinux")

install

@@ -147,11 +147,18 @@ function systemInitDetect() {
     # Get the path of the command where pid=1 following any symlinks
     pid_1_path=$(readlink --canonicalize -n /proc/1/exe)
     # returns '/sbin/init' (Debian Wheezy & Ubuntu Trusty)
-    # returns '(/usr)?/lib/systemd/systemd' (Debian Stretch, Debian Jessie, Ubuntu Xenial, CentOS 7)
+    # returns '(/usr)?/lib/systemd/systemd' (Debian Stretch, Debian Jessie, Debian Buster, Ubuntu Xenial, CentOS 7)
     verbose "Detected path to PID=1 process: $pid_1_path"
     # Get package of PID=1 path as it identifies the init system
-    pid_1_package=$(dpkg -S $pid_1_path 2>/dev/null || 
-                    rpm --qf '%{name}\n' -qf $pid_1_path 2>/dev/null)
+    if $if_debian_buster; then
+        # /usr/lib/systemd/systemd is provided by the base system in Debian Buster, so
+        # dpkg -S /usr/lib/systemd returns an error - no path found matching pattern
+        # This is a work around to avoid failing on package detection
+        pid_1_package=systemd
+    else
+        pid_1_package=$(dpkg -S $pid_1_path 2>/dev/null || 
+                        rpm --qf '%{name}\n' -qf $pid_1_path 2>/dev/null)
+    fi
     verbose "Detected package name for PID=1 process: $pid_1_package"
     case "${pid_1_package-$pid_1_path}" in
       *systemd*) has_systemd_init=true; verbose "Detected init system type: systemd" ;;
@@ -584,6 +591,7 @@ fi
 
 # Validate the distribution and release is a supported one; set boolean flags.
 is_debian_dist=false
+is_debian_buster=false
 is_debian_stretch=false
 is_debian_jessie=false
 is_ubuntu_dist=false
@@ -621,6 +629,11 @@ case "${dist}-${code}" in
         is_debian_dist=true
         is_debian_stretch=true
         ;;
+    debian-10|debian-buster)
+        code="buster"
+        is_debian_dist=true
+        is_debian_buster=true
+        ;;
     #Fix for Raspbian 9 (stretch)
     raspbian-9|9)
 	code="stretch"
@@ -684,6 +697,7 @@ if [ "$ignore_dependencies" = "f" ]; then
         apt_force_options="--allow-downgrades --allow-remove-essential --allow-change-held-packages"
         # Get apt-get version by returning the 2nd parameter from the 1st line of output
         apt_version=$(apt-get --version |awk 'NR == 1 { print $2 }')
+        # returns 1.8.0~alpha3 (Debian Buster)
         # returns: 1.4.7 (Debian Stretch)
         # returns: 0.9.7.9 (Debian Wheezy)
         # returns: 1.0.1ubuntu2 (Ubuntu Trusty)
@@ -983,6 +997,7 @@ loud "              * Configuring PHP in Apache *          "
 loud "-----------------------------------------------------"
 # Test common locations for php conf directory
 php_conf_dirs=(
+    "/etc/php/7.3/apache2/conf.d"   # Debian Buster
     "/etc/php/7.2/apache2/conf.d"   # Ubuntu Bionic
     "/etc/php/7.0/apache2/conf.d"   # Ubuntu Xenial
     "/etc/php5/apache2/conf.d"      # Debian Stretch, Debian Jessie, Ubuntu Trusty
@@ -1006,7 +1021,9 @@ else
 fi
 
 # Enable Apache modules
-if $is_ubuntu_bionic; then
+if $is_debian_buster; then
+    loudCmd "a2enmod rewrite php7.3"
+elif $is_ubuntu_bionic; then
     loudCmd "a2enmod rewrite php7.2"
 elif $is_ubuntu_xenial || $is_debian_stretch; then
     loudCmd "a2enmod rewrite php7.0"

installer/lib/requirements-debian-buster.apt

@@ -0,0 +1,69 @@
+apache2
+git
+libapache2-mod-php7.3
+php7.3
+php7.3-dev
+php7.3-bcmath
+php7.3-mbstring
+php-pear
+php7.3-gd
+php-amqplib
+
+lsb-release
+
+zip
+unzip
+
+rabbitmq-server
+
+postgresql
+postgresql-client
+php7.3-pgsql
+
+python
+python-virtualenv
+python-pip
+
+libsoundtouch-ocaml
+libtaglib-ocaml
+libao-ocaml
+libmad-ocaml
+ecasound
+libportaudio2
+libsamplerate0
+libvo-aacenc0
+
+python-rgain
+python-gst-1.0
+gstreamer1.0-plugins-ugly
+python-pika
+
+patch
+
+icecast2
+
+curl
+php7.3-curl
+mpg123
+
+libcamomile-ocaml-data
+libpulse0
+vorbis-tools
+lsb-release
+lsof
+vorbisgain
+flac
+vorbis-tools
+pwgen
+libfaad2
+php-apcu
+
+lame
+
+coreutils
+
+liquidsoap
+
+libopus0
+
+systemd-sysv