[JENKINS-38313] - Introduce API For Deleting logs

core/src/main/java/hudson/model/Run.java

@@ -1505,6 +1505,17 @@ public File getLogFile() {
         }
     }
 
+    /**
+     * Deletes the log in the storage.
+     * @return {@code true} if the log was deleted.
+     *         {@code false} if Log deletion is not supported.
+     * @throws IOException Failed to delete the log.
+     * @since TODO
+     */
+    public boolean deleteLog() throws IOException {
+        return getLogBrowser().deleteLog();
+    }
+
     /**
      * Returns an input stream that reads from the log file.
      * It will use a gzip-compressed log file (log.gz) if that exists.
@@ -1627,6 +1638,11 @@ public void delete() throws IOException {
             deleteArtifacts();
         } // for StandardArtifactManager, deleting the whole build dir suffices
 
+        final LogBrowser browser = getLogBrowser();
+        if (browser instanceof FileLogBrowser) {
+            browser.deleteLog();
+        } // for standard FileLogBrowser, deleting the whole build dir suffices
+
         synchronized (this) { // avoid holding a lock while calling plugin impls of onDeleted
         File tmp = new File(rootDir.getParentFile(),'.'+rootDir.getName());
 

core/src/main/java/jenkins/model/logging/LogBrowser.java

@@ -127,4 +127,12 @@ public List<String> getLog(int maxLines) throws IOException {
     @Nonnull
     public abstract File getLogFile() throws IOException;
 
+    /**
+     * Deletes the log in the storage.
+     * @return {@code true} if the log was deleted.
+     *         {@code false} if Log deletion is not supported.
+     * @throws IOException Failed to delete the log.
+     */
+    public abstract boolean deleteLog() throws IOException;
+
 }

core/src/main/java/jenkins/model/logging/impl/FileLogBrowser.java

@@ -48,6 +48,7 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 /**
@@ -91,6 +92,22 @@ public AnnotatedLargeText stepLog(@CheckForNull String stepId, boolean b) {
         );
     }
 
+    @Override
+    public boolean deleteLog() throws IOException {
+        File logFile = getLogFileOrFail(loggable);
+        if (logFile.exists()) {
+            try {
+                Files.delete(logFile.toPath());
+            } catch (Exception ex) {
+                throw new IOException("Failed to delete " + logFile, ex);
+            }
+        } else {
+            LOGGER.log(Level.FINE, "Trying to delete Log File of {0} which does not exist: {1}",
+                    new Object[] {loggable, logFile});
+        }
+        return true;
+    }
+
     @Override
     public InputStream getLogInputStream() throws IOException {
         File logFile = getLogFileOrFail(loggable);