Clean up http-client changes (#295)

* pkl-excutor tests: symlink 0.25.0 distribution into pkl-executable/build
* Use `IoUtils.getPklHomeDir` in HttpClientBuilder
* Simplify Exceptions.java
* Enable testing for older pkl-executor distribution

pkl-core/src/main/java/org/pkl/core/http/HttpClientBuilder.java

@@ -26,24 +26,26 @@ import java.util.List;
 import java.util.function.Supplier;
 import org.pkl.core.Release;
 import org.pkl.core.util.ErrorMessages;
+import org.pkl.core.util.IoUtils;
 
 final class HttpClientBuilder implements HttpClient.Builder {
-  private final Path userHome;
   private String userAgent;
   private Duration connectTimeout = Duration.ofSeconds(60);
   private Duration requestTimeout = Duration.ofSeconds(60);
+  private final Path caCertsDir;
   private final List<Path> certificateFiles = new ArrayList<>();
   private final List<URI> certificateUris = new ArrayList<>();
 
   HttpClientBuilder() {
-    this(Path.of(System.getProperty("user.home")));
+    this(IoUtils.getPklHomeDir().resolve("cacerts"));
   }
 
   // only exists for testing
-  HttpClientBuilder(Path userHome) {
-    this.userHome = userHome;
+  HttpClientBuilder(Path caCertsDir) {
     var release = Release.current();
-    userAgent = "Pkl/" + release.version() + " (" + release.os() + "; " + release.flavor() + ")";
+    this.caCertsDir = caCertsDir;
+    this.userAgent =
+        "Pkl/" + release.version() + " (" + release.os() + "; " + release.flavor() + ")";
   }
 
   public HttpClient.Builder setUserAgent(String userAgent) {
@@ -80,10 +82,9 @@ final class HttpClientBuilder implements HttpClient.Builder {
   }
 
   public HttpClient.Builder addDefaultCliCertificates() {
-    var directory = userHome.resolve(".pkl").resolve("cacerts");
     var fileCount = certificateFiles.size();
-    if (Files.isDirectory(directory)) {
-      try (var files = Files.list(directory)) {
+    if (Files.isDirectory(caCertsDir)) {
+      try (var files = Files.list(caCertsDir)) {
         files.filter(Files::isRegularFile).forEach(certificateFiles::add);
       } catch (IOException e) {
         throw new HttpClientInitException(e);

pkl-core/src/main/java/org/pkl/core/service/ExecutorSpiImpl.java

@@ -132,11 +132,18 @@ public class ExecutorSpiImpl implements ExecutorSpi {
   private HttpClient getOrCreateHttpClient(ExecutorSpiOptions options) {
     List<Path> certificateFiles;
     List<URI> certificateUris;
-    if (options instanceof ExecutorSpiOptions2) {
-      var options2 = (ExecutorSpiOptions2) options;
-      certificateFiles = options2.getCertificateFiles();
-      certificateUris = options2.getCertificateUris();
-    } else {
+    try {
+      if (options instanceof ExecutorSpiOptions2) {
+        var options2 = (ExecutorSpiOptions2) options;
+        certificateFiles = options2.getCertificateFiles();
+        certificateUris = options2.getCertificateUris();
+      } else {
+        certificateFiles = List.of();
+        certificateUris = List.of();
+      }
+      // host pkl-executor does not have class ExecutorOptions2 defined.
+      // this will happen if the pkl-executor distribution is too old.
+    } catch (NoClassDefFoundError e) {
       certificateFiles = List.of();
       certificateUris = List.of();
     }

pkl-core/src/main/java/org/pkl/core/util/Exceptions.java

@@ -20,10 +20,8 @@ public final class Exceptions {
 
   public static Throwable getRootCause(Throwable t) {
     var result = t;
-    var cause = result.getCause();
-    while (cause != null) {
-      result = cause;
-      cause = cause.getCause();
+    while (result.getCause() != null) {
+      result = result.getCause();
     }
     return result;
   }