1.23.1: Clean temporary directory before migrations

CHANGELOG.md

@@ -2,6 +2,13 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 1.23.1
+
+### Fixed
+
+- `MpsMigrate` and `runMigrations` tasks will clean their temporary directory (where MPS caches and the generated Ant
+  script are located) before each run. This helps avoid complaints by MPS that files have been modified externally.
+
 ## 1.23.0
 
 ### Added

build.gradle.kts

@@ -24,7 +24,7 @@ plugins {
     id("org.jetbrains.kotlinx.binary-compatibility-validator") version "0.13.2"
 }
 
-val baseVersion = "1.23.0"
+val baseVersion = "1.23.1"
 
 group = "de.itemis.mps"
 

src/main/kotlin/de/itemis/mps/gradle/runmigrations/Plugin.kt

@@ -84,6 +84,9 @@ open class RunMigrationsMpsProjectPlugin : Plugin<Project> {
                             throw GradleException("Specified MPS location does not exist or is not a directory: $mpsLocation")
                         }
 
+                        // Clean temporary dir to help avoid strange errors
+                        temporaryDir.listFiles()?.forEach { it.deleteRecursively() }
+
                         val buildFile = temporaryDir.resolve("build.xml")
                         buildFile.printWriter().use {
                             MarkupBuilder(it).withGroovyBuilder {

src/main/kotlin/de/itemis/mps/gradle/tasks/MpsMigrate.kt

@@ -85,6 +85,10 @@ abstract class MpsMigrate @Inject constructor(
 
     @TaskAction
     fun execute() {
+        // When MPS detects that files have changed externally then instead of updating the VFS cache it complains.
+        // Cleaning temporary directory helps avoid this.
+        cleanTemporaryDir()
+
         val buildFile = temporaryDir.resolve("build.xml")
         writeBuildFile(buildFile)
 
@@ -105,6 +109,10 @@ abstract class MpsMigrate @Inject constructor(
         }
     }
 
+    private fun cleanTemporaryDir() {
+        temporaryDir.listFiles()?.forEach { it.deleteRecursively() }
+    }
+
     private fun writeBuildFile(buildFile: File) {
         buildFile.printWriter().use { writer ->
             MarkupBuilder(writer).withGroovyBuilder {