Test provisioner has been too flaky

CHANGES.md

@@ -7,6 +7,9 @@ You might be looking for:
 
 ### Version 1.27.0-SNAPSHOT - TBD (javadoc [lib](https://diffplug.github.io/spotless/javadoc/spotless-lib/snapshot/) [lib-extra](https://diffplug.github.io/spotless/javadoc/spotless-lib-extra/snapshot/), [snapshot repo](https://oss.sonatype.org/content/repositories/snapshots/com/diffplug/spotless/))
 
+* Ignored `KtLintStepTest`, because [gradle/gradle#11752](https://github.com/gradle/gradle/issues/11752) is causing too many CI failures. ([#499](https://github.com/diffplug/spotless/pull/499))
+    * Also fixed a minor problem in TestProvisioner.
+
 ### Version 1.26.1 - November 27th 2019 (javadoc [lib](https://diffplug.github.io/spotless/javadoc/spotless-lib/1.26.0/) [lib-extra](https://diffplug.github.io/spotless/javadoc/spotless-lib-extra/1.26.0/), artifact [lib]([jcenter](https://bintray.com/diffplug/opensource/spotless-lib), [lib-extra]([jcenter](https://bintray.com/diffplug/opensource/spotless-lib-extra)))
 
 * Revert the change in console display of errors from 1.26.0 ([#485](https://github.com/diffplug/spotless/pull/485)) because [of these problems](https://github.com/diffplug/spotless/pull/485#issuecomment-552925932).

RELEASE_CHECKLIST.md

@@ -2,6 +2,7 @@
 
 - [ ] Update [`CHANGES.md`](CHANGES.md), [`plugin-gradle/CHANGES.md`](plugin-gradle/CHANGES.md), and [`plugin-maven/CHANGES.md`](plugin-maven/CHANGES.md)
 - [ ] Upgrade [`gradle.properties`](gradle.properties).
+- [ ] In an IDE, unignore `KtLintStepTest` and run
 - [ ] Run `./gradlew spotlessApply`
 - [ ] Make sure all files are committed
 - [ ] Run `./gradlew check`

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,21 +1,5 @@
 #!/usr/bin/env sh
 
-#
-# Copyright 2015 the original author or authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -44,7 +28,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+DEFAULT_JVM_OPTS='"-Xmx64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
@@ -125,8 +109,8 @@ if $darwin; then
     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
     JAVACMD=`cygpath --unix "$JAVACMD"`

gradlew.bat

@@ -1,19 +1,3 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -30,7 +14,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+set DEFAULT_JVM_OPTS="-Xmx64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome

testlib/src/main/java/com/diffplug/spotless/TestProvisioner.java

@@ -103,6 +103,11 @@ private static Provisioner caching(String name, Supplier<Provisioner> input) {
 			}
 		} else {
 			cached = new HashMap<>();
+			try {
+				Files.createParentDirs(cacheFile);
+			} catch (IOException e) {
+				throw Errors.asRuntime(e);
+			}
 		}
 		return (withTransitives, mavenCoordsRaw) -> {
 			ImmutableSet<String> mavenCoords = ImmutableSet.copyOf(mavenCoordsRaw);

testlib/src/test/java/com/diffplug/spotless/kotlin/KtLintStepTest.java

@@ -15,6 +15,7 @@
  */
 package com.diffplug.spotless.kotlin;
 
+import org.junit.Ignore;
 import org.junit.Test;
 
 import com.diffplug.spotless.FormatterStep;
@@ -23,6 +24,12 @@
 import com.diffplug.spotless.StepHarness;
 import com.diffplug.spotless.TestProvisioner;
 
+/**
+ * This class is the only one that uses jcenter, and it seems to be the only one that
+ * causes these problems. The root is still a gradle bug, but in the meantime we don't
+ * need to hold up *every* PR with this: https://github.com/gradle/gradle/issues/11752
+ */
+@Ignore
 public class KtLintStepTest extends ResourceHarness {
 	@Test
 	public void behavior() throws Exception {