Set version with git (#735)

* Get app version using VERSION env or git script

* Update suse container and ci to set the version

* Apply better elixir conventions

.github/workflows/ci.yaml

@@ -484,7 +484,10 @@ jobs:
 
       - name: Set version
         run: |
-          VERSION=${{ steps.latest-tag.outputs.tag }}
+          git config --global --add safe.directory /__w/web/web
+          VERSION=$(./hack/get_version_from_git.sh)
+          # "+" character is not allowed in OBS dockerfile version strings
+          VERSION=${VERSION//[+]/-}
           sed -i 's~%%VERSION%%~'"${VERSION}"'~' packaging/suse/Dockerfile
 
       - name: Commit on OBS

hack/get_version_from_git.sh

@@ -1,4 +1,7 @@
 #!/bin/sh
+set -e
+set -o pipefail
+
 TAG=$( git tag | grep -E "[0-9]\.[0-9]\.[0-9]" | sort -rn | head -n1 )
 
 if [ -n "${TAG}" ]; then

mix.exs

@@ -1,11 +1,13 @@
 defmodule Trento.MixProject do
   use Mix.Project
 
+  @version "1.1.0"
+
   def project do
     [
       app: :trento,
       description: "Easing your life in administering SAP applications",
-      version: "1.1.0",
+      version: get_version(),
       elixir: "~> 1.13",
       elixirc_paths: elixirc_paths(Mix.env()),
       compilers: Mix.compilers(),
@@ -121,4 +123,13 @@ defmodule Trento.MixProject do
       ]
     ]
   end
+
+  defp get_version, do: System.get_env("VERSION", get_version_from_git())
+
+  defp get_version_from_git do
+    case File.cwd!() |> Path.join("hack/get_version_from_git.sh") |> System.cmd([]) do
+      {version, 0} -> version |> String.trim("\n")
+      _ -> @version
+    end
+  end
 end

packaging/suse/Dockerfile

@@ -22,7 +22,7 @@ ENV MIX_ENV=prod
 ENV MIX_HOME=/usr/bin
 ENV FLAVOR="Premium"
 RUN mix phx.digest
-RUN mix release
+RUN VERSION=%%VERSION%% mix release
 
 FROM bci/bci-base:15.3 AS trento
 # Define labels according to https://en.opensuse.org/Building_derived_containers