Merge branch 'bugfix/mix.exs-version-dot-git-less' into 'develop'

mix.exs: version git-less (part 2, MacOS-compat)

See merge request pleroma/pleroma!2420

mix.exs

@@ -230,14 +230,17 @@ defmodule Pleroma.Mixfile do
   defp version(version) do
     identifier_filter = ~r/[^0-9a-z\-]+/i
 
-    # Pre-release version, denoted from patch version with a hyphen
+    {_cmdgit, cmdgit_err} = System.cmd("sh", ["-c", "command -v git"])
+
+    git_pre_release =
+      if cmdgit_err == 0 do
         {tag, tag_err} =
           System.cmd("git", ["describe", "--tags", "--abbrev=0"], stderr_to_stdout: true)
 
         {describe, describe_err} = System.cmd("git", ["describe", "--tags", "--abbrev=8"])
         {commit_hash, commit_hash_err} = System.cmd("git", ["rev-parse", "--short", "HEAD"])
 
-    git_pre_release =
+        # Pre-release version, denoted from patch version with a hyphen
         cond do
           tag_err == 0 and describe_err == 0 ->
             describe
@@ -250,12 +253,14 @@ defmodule Pleroma.Mixfile do
             "0-g" <> String.trim(commit_hash)
 
           true ->
-          ""
+            nil
+        end
       end
 
     # Branch name as pre-release version component, denoted with a dot
     branch_name =
-      with {branch_name, 0} <- System.cmd("git", ["rev-parse", "--abbrev-ref", "HEAD"]),
+      with 0 <- cmdgit_err,
+           {branch_name, 0} <- System.cmd("git", ["rev-parse", "--abbrev-ref", "HEAD"]),
            branch_name <- String.trim(branch_name),
            branch_name <- System.get_env("PLEROMA_BUILD_BRANCH") || branch_name,
            true <-
@@ -269,7 +274,7 @@ defmodule Pleroma.Mixfile do
 
         branch_name
       else
-        _ -> "stable"
+        _ -> ""
       end
 
     build_name =