[2.x] fix: restore CLI precedence over .sbtopts

According to the issue, `.sbtopts` entries are appended after
CLI args in sbt 1.12.x, so `.sbtopts` JVM memory settings (e.g., `-Xmx2g`) override CLI `--mem`,
causing invalid JVM settings.

launcher-package/integration-test/src/test/scala/RunnerScriptTest.scala

@@ -194,6 +194,29 @@ object RunnerScriptTest extends verify.BasicTestSuite with ShellScriptUtil:
         s"Machine config should appear before project config. machineIndex=$machineIndex, projectIndex=$projectIndex"
       )
 
+  testOutput(
+    "command line options override project .sbtopts",
+    sbtOptsFileContents =
+      "-J-Xmx2g\n-J-XX:ReservedCodeCacheSize=1g\n-J-XX:MaxMetaspaceSize=2g\n-J-Xss512m\n-J-XX:+UseG1GC"
+  )("-d", "-v", "-mem", "12288"): (out: List[String]) =>
+    if (isWindows) cancel("Test not supported on windows")
+    else
+      val cmdLineStart = out.indexWhere(_.contains("Executing command line"))
+      assert(cmdLineStart >= 0, "Command line section not found")
+
+      val cmdLine = out.drop(cmdLineStart + 1).takeWhile(!_.trim.isEmpty)
+      val xmxCliIndex = cmdLine.indexWhere(_.contains("-Xmx12288m"))
+      val xmxSbtoptsIndex = cmdLine.indexWhere(_.contains("-Xmx2g"))
+      val g1Index = cmdLine.indexWhere(_.contains("-XX:+UseG1GC"))
+
+      assert(xmxCliIndex >= 0, "CLI memory setting not found in command line")
+      assert(xmxSbtoptsIndex < 0, "sbtopts -Xmx2g should be overridden by CLI")
+      assert(g1Index >= 0, "sbtopts non-memory option not found in command line")
+      assert(
+        g1Index < xmxCliIndex,
+        s"sbtopts options should appear before CLI memory settings. g1Index=$g1Index, xmxCliIndex=$xmxCliIndex"
+      )
+
   // Test for issue #7289: Special characters in .jvmopts should not cause shell expansion
   testOutput(
     "sbt with special characters in .jvmopts (pipes, wildcards, ampersands)",

sbt

@@ -859,17 +859,23 @@ runNativeClient() {
 
 original_args=("$@")
 
+sbt_file_opts=()
+
 # Pull in the machine-wide settings configuration.
 if [[ -f "$machine_sbt_opts_file" ]]; then
-  set -- "$@" $(loadConfigFile "$machine_sbt_opts_file")
+  sbt_file_opts+=($(loadConfigFile "$machine_sbt_opts_file"))
 else
   # Otherwise pull in the default settings configuration.
-  [[ -f "$dist_sbt_opts_file" ]] && set -- "$@" $(loadConfigFile "$dist_sbt_opts_file")
+  [[ -f "$dist_sbt_opts_file" ]] && sbt_file_opts+=($(loadConfigFile "$dist_sbt_opts_file"))
 fi
 
 # Pull in the project-level config file, if it exists (highest priority, overrides machine/dist).
-# Append so it appears last in command line and wins for duplicate properties.
+[[ -f "$sbt_opts_file" ]] && sbt_file_opts+=($(loadConfigFile "$sbt_opts_file"))
-[[ -f "$sbt_opts_file" ]] && set -- "$@" $(loadConfigFile "$sbt_opts_file")
+
+# Prepend sbtopts so command line args appear last and win for duplicate properties.
+if (( ${#sbt_file_opts[@]} > 0 )); then
+  set -- "${sbt_file_opts[@]}" "$@"
+fi
 
 # Pull in the project-level java config, if it exists.
 [[ -f ".jvmopts" ]] && export JAVA_OPTS="$JAVA_OPTS $(loadConfigFile .jvmopts)"