Use GitVersion plugin to pick OSS version tags

GitOrigin-RevId: 40731d3f6baf3147443d716ceefbb983f6ce7c35

.github/workflows/copy.bara.sky

@@ -27,7 +27,6 @@ PUSH_INCLUDE = [
     ".scalafix.conf",
     ".scalafmt.conf",
     ".gitignore",
-    "project/GitVersionPrefix.scala", # While we don't want to copy this file in-place, the rule in PR_TRANSFORMATIONS will handle moving it appropriately
 ] + ["project/" + f for f in PROJECT_LEVEL_INCLUDE]
 
 PUSH_EXCLUDE = []
@@ -43,9 +42,6 @@ PR_TRANSFORMATIONS = [
     core.move("public/.scalafmt.conf", ".scalafmt.conf"),
     core.move("public/.gitignore", ".gitignore"),
     core.move("public/project/", "project/", paths = glob(PROJECT_LEVEL_INCLUDE)),
-    # GitVersionPrefix.scala is specifically NOT copied between repos, because quine-plus uses a different tag scheme.
-    # Invariant: These files will both contain an object `GitVersionPrefix` with a single member `string` with type `String`
-    core.move("public/project/GitVersionPrefix.scala", "project/GitVersionPrefix.scala")
 ]
 
 SCRUB_MESSAGE = [

project/GitVersion.scala

@@ -13,10 +13,14 @@ object GitVersion extends AutoPlugin {
   import autoImport._
 
   override lazy val projectSettings = Seq(
-    tagPrefix := GitVersionPrefix.string,
+    tagPrefix := "quine/",
     version := {
       val prefix = tagPrefix.value
-      gitReader.value.withGit(_.describedVersion(Seq(prefix + '*'))).fold("UNKNOWN")(_.stripPrefix(prefix))
+      gitReader.value
+        .withGit(_.describedVersion(Seq(prefix + '*')).map(_.stripPrefix(prefix)))
+        // When running in the OSS repo, expect a "v" prefix instead of "quine/"
+        .orElse(gitReader.value.withGit(_.describedVersion(Seq("v*"))).map(_.stripPrefix("v")))
+        .getOrElse("UNKNOWN")
     }
   )