handle edge cases of key ring unavailability

sdk/identity/azure-identity/src/main/java/com/azure/identity/implementation/PersistentTokenCacheImpl.java

@@ -5,6 +5,7 @@
 
 import com.azure.core.exception.ClientAuthenticationException;
 import com.azure.core.util.logging.ClientLogger;
+import com.azure.identity.implementation.util.IdentityUtil;
 import com.microsoft.aad.msal4j.ITokenCacheAccessAspect;
 import com.microsoft.aad.msal4j.ITokenCacheAccessContext;
 import com.microsoft.aad.msal4jextensions.PersistenceSettings;
@@ -87,11 +88,13 @@ private PersistenceSettings getPersistenceSettings() {
                     getCacheName(name != null ? name : DEFAULT_KEYRING_ITEM_NAME), DEFAULT_KEYRING_ATTR_NAME,
                     DEFAULT_KEYRING_ATTR_VALUE, null, null);
                 return persistenceSettingsBuilder.build();
-            } catch (KeyRingAccessException e) {
-                if (!allowUnencryptedStorage) {
-                    throw LOGGER.logExceptionAsError(e);
-                }
-                persistenceSettingsBuilder.setLinuxUseUnprotectedFileAsCacheStorage(true);
+                } catch (Exception e) {
+                    if (e instanceof KeyRingAccessException || !IdentityUtil.isKeyRingAccessible()) {
+                        if (!allowUnencryptedStorage) {
+                            throw LOGGER.logExceptionAsError(e instanceof KeyRingAccessException ? ((KeyRingAccessException) e) : new RuntimeException(e));
+                        }   
+                    persistenceSettingsBuilder.setLinuxUseUnprotectedFileAsCacheStorage(true);
+                    }
                 return persistenceSettingsBuilder.build();
             }
         }

sdk/identity/azure-identity/src/main/java/com/azure/identity/implementation/util/IdentityUtil.java

@@ -205,4 +205,28 @@ public static AuthenticationRecord loadVSCodeAuthRecord() throws IOException {
         // Deserialize to AuthenticationRecord
         return AuthenticationRecord.deserialize(json);
     }
+
+    /**
+     * Checks if the GNOME Keyring is accessible.
+     * @return true if accessible, false otherwise.
+     */
+    public static boolean isKeyRingAccessible() {
+        try {
+            ProcessBuilder processBuilder = new ProcessBuilder("secret-tool", "lookup", "test", "test");
+            processBuilder.redirectErrorStream(true);
+            Process process = processBuilder.start();
+
+            int exitCode = process.waitFor();
+            if (exitCode == 0) {
+                return true; // Keyring is accessible
+            } else {
+                LOGGER.verbose("GNOME Keyring is unavailable or inaccessible.");
+                return false;
+            }
+        } catch (IOException | InterruptedException e) {
+            Thread.currentThread().interrupt(); // Restore interrupted state if InterruptedException occurs
+            LOGGER.verbose("Error while checking GNOME Keyring availability: " + e.getMessage());
+            return false;
+        }
+    }
 }