How do you manage app versions in releases?

That’s what is in my rel/config.exs: set version: current_version(:my_app)

I have several apps that should cause the release version to be incremented …

That’s from the elixir Version docs:

Build information can be added by appending +[0-9A-Za-z-.]:
"1.0.0-alpha.3+20130417140000"

So you could append the timestamps for different builds and use the release version for actually versionable changes in the umbrella topology.

I’m not entirely happy with it, but for the time being each app in the umbrella sets its version by doing a Code.eval_file call to a common compile-time .exs file that reads the current git SHA and appends it to the base version.

Curious if there have been any better ideas to come from the community for this. We also just manually increase the number.

I am using such script:

defmodule GitVersion do
  def version do
    case System.cmd(
           "git",
           ~w[describe --always --dirty=+dirty],
           stderr_to_stdout: true
         ) do
      {raw, 0} ->
        case Version.parse(raw) do
          {:ok, version} ->
            version
            |> bump_version()
            |> to_string()

          :error ->
            "0.0.0-#{String.trim(raw)}"
        end

      _ ->
        "0.0.0-dev"
    end
  end

  defp bump_version(%Version{pre: []} = version), do: version

  defp bump_version(%Version{patch: p} = version),
    do: struct(version, patch: p + 1)
end

In my mix.exs to extract version from the Git tags. TBH I would <3 to see something like that in Mix itself like there is {version, git} in Rebar3. This would make version management so much simpler.