drop bloop in CI

Author: lbialy

testops/src/main/scala/sloth/ExampleRunner.scala

@@ -22,16 +22,18 @@ import sloth.patching.BytecodePatcher
   */
 object BloopWarmup {
   // First access boots the daemon; concurrent accessors block on lazy-val init until it's ready.
+  // Skipped on CI where --server=false disables Bloop entirely.
   private lazy val booted: Unit = {
-    val dir = os.temp.dir(prefix = "sloth-bloop-warmup-")
-    os.write.over(dir / "Warmup.scala", "object Warmup\n")
-    // Generous startup timeout so a cold daemon (JVM download + start) doesn't trip the 30s default.
-    os.proc("scala-cli", "compile", "--jvm", "17", "--bloop-startup-timeout", "180s", "-S", "3.3.8", dir.toString)
-      .call(check = false, stderr = os.Pipe, stdout = os.Pipe)
-    os.remove.all(dir)
+    if (!TestPaths.isCI) {
+      val dir = os.temp.dir(prefix = "sloth-bloop-warmup-")
+      os.write.over(dir / "Warmup.scala", "object Warmup\n")
+      os.proc("scala-cli", "compile", "--jvm", "17", "--bloop-startup-timeout", "180s", "-S", "3.3.8", dir.toString)
+        .call(check = false, stderr = os.Pipe, stdout = os.Pipe)
+      os.remove.all(dir)
+    }
   }
 
-  /** Ensure the Bloop daemon is running before launching parallel compilations. Idempotent. */
+  /** Ensure the Bloop daemon is running before launching parallel compilations. Idempotent. No-op on CI. */
   def ensure(): Unit = booted
 }
 
@@ -121,7 +123,7 @@ class ExampleRunner(
     // default target and is therefore only run on the JDK-25 leg (used as a static reference here).
     val releaseArgs = if (scalaVersion.startsWith("3.8")) Seq.empty else Seq("--release", "9")
     val result = os
-      .proc("scala-cli", "compile", "--jvm", "17", "--bloop-startup-timeout", "180s", releaseArgs, "-S", scalaVersion, targetDir.toString)
+      .proc("scala-cli", "compile", "--jvm", "17", TestPaths.scalaCliServerArgs, releaseArgs, "-S", scalaVersion, targetDir.toString)
       .call(cwd = targetDir, stderr = os.Pipe, stdout = os.Pipe, check = false)
 
     // Only log output if compilation failed or not in quiet mode

testops/src/main/scala/sloth/TestPaths.scala

@@ -7,6 +7,12 @@ package sloth
   */
 object TestPaths {
 
+  val isCI: Boolean = sys.env.contains("CI")
+
+  /** Extra scala-cli flags for CI: skip Bloop to avoid daemon contention on resource-constrained runners. */
+  val scalaCliServerArgs: Seq[String] =
+    if isCI then Seq("--server=false") else Seq("--bloop-startup-timeout", "180s")
+
   /** Locate the assembled agent jar under agent/target/ without hard-coding the Scala version in
     * the path. The agent sets crossPaths := false so the jar lands directly in agent/target/, but
     * we search recursively to stay robust against build layout changes.

tests-jdk11/src/test/scala/sloth/Jdk9RuntimeTests.scala

@@ -57,7 +57,7 @@ class Jdk9RuntimeTests extends FunSuite with ExampleLoader {
 
   /** Full classpath (scala-library + deps) for a compiled example, via scala-cli. */
   def getScalaCliClasspath(targetDir: os.Path, scalaVersion: String): String =
-    os.proc("scala-cli", "compile", "--print-classpath", "--jvm", "17", "--release", "9", "--bloop-startup-timeout", "180s", "-S", scalaVersion, targetDir.toString)
+    os.proc("scala-cli", "compile", "--print-classpath", "--jvm", "17", "--release", "9", TestPaths.scalaCliServerArgs, "-S", scalaVersion, targetDir.toString)
       .call(cwd = targetDir, stderr = os.Pipe, stdout = os.Pipe)
       .out.text().trim
 

tests-jdk25/src/test/scala/sloth/AgentIntegrationTests.scala

@@ -55,11 +55,11 @@ class AgentIntegrationTests extends FunSuite {
     os.write(tempDir / "AgentTestApp.scala", testSource)
 
     println(s"Compiling test source with Scala $scalaVersion...")
-    os.proc("scala-cli", "compile", "--jvm", "17", "--bloop-startup-timeout", "180s", "-S", scalaVersion, tempDir.toString)
+    os.proc("scala-cli", "compile", "--jvm", "17", TestPaths.scalaCliServerArgs, "-S", scalaVersion, tempDir.toString)
       .call(cwd = tempDir, stdout = os.Inherit, stderr = os.Inherit)
 
     // Get classpath
-    val cpResult = os.proc("scala-cli", "compile", "--print-classpath", "--jvm", "17", "--bloop-startup-timeout", "180s", "-S", scalaVersion, tempDir.toString)
+    val cpResult = os.proc("scala-cli", "compile", "--print-classpath", "--jvm", "17", TestPaths.scalaCliServerArgs, "-S", scalaVersion, tempDir.toString)
       .call(cwd = tempDir, stderr = os.Pipe, stdout = os.Pipe)
     classpath = cpResult.out.text().trim
 

tests-jdk25/src/test/scala/sloth/BytecodePatchingTests.scala

@@ -258,7 +258,7 @@ class BytecodePatchingTests extends FunSuite with ExampleLoader {
     */
   def getScalaCliClasspath(targetDir: os.Path, scalaVersion: String): String = {
     val result = os
-      .proc("scala-cli", "compile", "--print-classpath", "--jvm", "17", "--bloop-startup-timeout", "180s", "-S", scalaVersion, targetDir.toString)
+      .proc("scala-cli", "compile", "--print-classpath", "--jvm", "17", TestPaths.scalaCliServerArgs, "-S", scalaVersion, targetDir.toString)
       .call(cwd = targetDir, stderr = os.Pipe, stdout = os.Pipe)
 
     result.out.text().trim