Add support to build release with mix

.gitignore

@@ -20,6 +20,7 @@
 /ejabberdctl
 /ejabberdctl.example
 /rel/ejabberd/
+/rel/overlays/
 /src/eldap_filter_yecc.erl
 /vars.config
 /dialyzer/

mix.exs

@@ -13,6 +13,7 @@ defmodule Ejabberd.Mixfile do
      erlc_paths: ["asn1", "src"],
      # Elixir tests are starting the part of ejabberd they need
      aliases: [test: "test --no-start"],
+     releases: releases(),
      package: package(),
      deps: deps()]
   end
@@ -180,6 +181,80 @@ defmodule Ejabberd.Mixfile do
     end
   end
 
+  defp releases do
+    maybe_tar = case Mix.env() do
+      :prod -> [:tar]
+      _ -> []
+    end
+    [
+      ejabberd: [
+        include_executables_for: [:unix],
+        # applications: [runtime_tools: :permanent]
+        steps: [&copy_extra_files/1, :assemble | maybe_tar]
+      ]
+    ]
+  end
+
+  defp copy_extra_files(release) do
+    assigns = [
+      version: version(),
+      rootdir: config(:rootdir),
+      installuser: config(:installuser),
+      libdir: config(:libdir),
+      sysconfdir: config(:sysconfdir),
+      localstatedir: config(:localstatedir),
+      docdir: config(:docdir),
+      erl: config(:erl),
+      epmd: config(:epmd),
+      bindir: Path.join([config(:release_dir), "releases", version()]),
+      release_dir: config(:release_dir),
+      erts_vsn: "erts-#{release.erts_version}"
+    ]
+    ro = "rel/overlays"
+    File.rm_rf(ro)
+
+    System.shell("sed -e 's|{{\\(\[_a-z\]*\\)}}|<%= @\\1 %>|g' ejabberdctl.template > ejabberdctl.example1")
+    Mix.Generator.copy_template("ejabberdctl.example1", "ejabberdctl.example2", assigns)
+    System.shell("sed -e 's|{{\\(\[_a-z\]*\\)}}|<%= @\\1 %>|g' ejabberdctl.example2 > ejabberdctl.example3")
+    System.shell("sed -e 's|ERLANG_NODE=ejabberd@localhost|ERLANG_NODE=ejabberd|g' ejabberdctl.example3 > ejabberdctl.example4")
+    System.shell("sed -e 's|INSTALLUSER=|ERL_OPTIONS=\"-setcookie \\$\\(cat \"\\${SCRIPT_DIR%/*}/releases/COOKIE\")\"\\nINSTALLUSER=|g' ejabberdctl.example4 > ejabberdctl.example5")
+    Mix.Generator.copy_template("ejabberdctl.example5", "#{ro}/bin/ejabberdctl", assigns)
+    File.chmod("#{ro}/bin/ejabberdctl", 0o755)
+
+    File.rm("ejabberdctl.example1")
+    File.rm("ejabberdctl.example2")
+    File.rm("ejabberdctl.example3")
+    File.rm("ejabberdctl.example4")
+    File.rm("ejabberdctl.example5")
+
+    suffix = case Mix.env() do
+      :dev ->
+        Mix.Generator.copy_file("test/ejabberd_SUITE_data/ca.pem", "#{ro}/etc/ejabberd/ca.pem")
+        Mix.Generator.copy_file("test/ejabberd_SUITE_data/cert.pem", "#{ro}/etc/ejabberd/cert.pem")
+        ".example"
+      _ -> ""
+    end
+
+    Mix.Generator.copy_file("ejabberd.yml.example", "#{ro}/etc/ejabberd/ejabberd.yml#{suffix}")
+    Mix.Generator.copy_file("ejabberdctl.cfg.example", "#{ro}/etc/ejabberd/ejabberdctl.cfg#{suffix}")
+    Mix.Generator.copy_file("inetrc", "#{ro}/etc/ejabberd/inetrc")
+    Mix.Generator.copy_template("rel/vm.args.mix", "#{ro}/etc/ejabberd/vm.args", assigns)
+
+    Enum.each(File.ls!("sql"),
+      fn x ->
+        Mix.Generator.copy_file("sql/#{x}", "#{ro}/lib/ejabberd-#{release.version}/priv/sql/#{x}")
+      end)
+
+    Mix.Generator.create_directory("#{ro}/var/lib/ejabberd")
+
+    case Mix.env() do
+      :dev -> System.shell("REL_DIR_TEMP=$PWD/rel/overlays/ rel/setup-dev.sh")
+      _ -> :ok
+    end
+
+    release
+  end
+
 end
 
 defmodule Mix.Tasks.Compile.Asn1 do

rel/vm.args.mix

@@ -0,0 +1,14 @@
+## Customize flags given to the VM: https://erlang.org/doc/man/erl.html
+## -mode/-name/-sname/-setcookie are configured via env vars, do not set them here
+
+-boot ../releases/<%= @version %>/start_clean
+-boot_var RELEASE_LIB ../lib
+
+## Number of dirty schedulers doing IO work (file, sockets, and others)
+##+SDio 5
+
+## Increase number of concurrent ports/sockets
+##+Q 65536
+
+## Tweak GC to run more often
+##-env ERL_FULLSWEEP_AFTER 10