feat: add shell executor interface for running shell commands during …

…recipe execution

rewrite-core/src/main/java/org/openrewrite/shell/exec/ShellExecutor.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2024 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.
+ */
+package org.openrewrite.shell.exec;
+
+import org.openrewrite.ExecutionContext;
+import org.openrewrite.Incubating;
+import org.openrewrite.scheduling.WorkingDirectoryExecutionContextView;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@Incubating(since = "8.30.0")
+@SuppressWarnings("unused")
+public interface ShellExecutor {
+
+    @SuppressWarnings("unused")
+    default void init() {}
+
+    @SuppressWarnings("unused")
+    default Path exec(List<String> command, Path workingDirectory, Map<String, String> environment, ExecutionContext ctx) {
+        return exec(command, workingDirectory, environment, ctx, 5L);
+    }
+
+    default Path exec(List<String> command, Path workingDirectory, Map<String, String> environment, ExecutionContext ctx, Long timeoutMinutes) {
+        Path stdOut = null, stdErr = null;
+        try {
+            ProcessBuilder builder = new ProcessBuilder();
+            builder.command(command);
+            builder.directory(workingDirectory.toFile());
+            builder.environment().putAll(environment);
+
+            stdOut = Files.createTempFile(WorkingDirectoryExecutionContextView.view(ctx).getWorkingDirectory(), "shell",
+                    null);
+            stdErr = Files.createTempFile(WorkingDirectoryExecutionContextView.view(ctx).getWorkingDirectory(), "shell",
+                    null);
+            builder.redirectOutput(ProcessBuilder.Redirect.to(stdOut.toFile()));
+            builder.redirectError(ProcessBuilder.Redirect.to(stdErr.toFile()));
+            Process process = builder.start();
+
+            process.waitFor(timeoutMinutes, TimeUnit.MINUTES);
+            if (process.exitValue() != 0) {
+                String error = "Command failed:" + String.join(" ", command);
+                if (Files.exists(stdErr)) {
+                    error += "\n" + new String(Files.readAllBytes(stdErr));
+                }
+                throw new RuntimeException(error);
+            }
+            return stdOut;
+        } catch (IOException | InterruptedException e) {
+            throw new RuntimeException(e);
+        } finally {
+            if (stdOut != null) {
+                // noinspection ResultOfMethodCallIgnored
+                stdOut.toFile().delete();
+            }
+            if (stdErr != null) {
+                // noinspection ResultOfMethodCallIgnored
+                stdErr.toFile().delete();
+            }
+        }
+    }
+
+    @SuppressWarnings("unused")
+    default void postExec() {}
+}