Handle HTTP request returned status code 412 (Precondition Failed) for session uploads (#227)

* Handle HTTP request returned status code 412 (Precondition Failed) for session uploads to OneDrive Personal Accounts
* Fix Failed to remove file /root/.config/onedrive/resume_upload: No such file or directory if there is a session upload error and the resume file does not get created
* Handle response codes when using 2 different systems using --upload-only but the same OneDrive account and uploading the same filename to the same location

src/sync.d

@@ -977,6 +977,14 @@ final class SyncEngine
 								try {
 									response = onedrive.simpleUploadReplace(path, item.driveId, item.id, item.eTag);
 								} catch (OneDriveException e) {
+									if (e.httpStatusCode == 404) {
+										// HTTP request returned status code 404 - the eTag provided does not exist
+										// Delete record from the local database - file will be uploaded as a new file
+										log.vlog("OneDrive returned a 'HTTP 404 - eTag Issue' - gracefully handling error");
+										itemdb.deleteById(item.driveId, item.id);
+										return;
+									}
+								
 									// Resolve https://github.com/abraunegg/onedrive/issues/36
 									if ((e.httpStatusCode == 409) || (e.httpStatusCode == 423)) {
 										// The file is currently checked out or locked for editing by another user
@@ -990,10 +998,10 @@ final class SyncEngine
 									
 									if (e.httpStatusCode == 412) {
 										// HTTP request returned status code 412 - ETag does not match current item's value
-										// Remove the offending file from OneDrive - file will be uploaded as a new file
+										// Delete record from the local database - file will be uploaded as a new file
-										onedrive.deleteById(item.driveId, item.id, item.eTag);
+										log.vlog("OneDrive returned a 'HTTP 412 - Precondition Failed' - gracefully handling error");
-										// Delete from the local database
 										itemdb.deleteById(item.driveId, item.id);
+										return;
 									}
 									
 									if (e.httpStatusCode == 504) {
@@ -1006,7 +1014,17 @@ final class SyncEngine
 								writeln("done.");
 							} else {
 								writeln("");
+								try {
 									response = session.upload(path, item.driveId, item.parentId, baseName(path), item.eTag);
+								} catch (OneDriveException e) {	
+									if (e.httpStatusCode == 412) {
+										// HTTP request returned status code 412 - ETag does not match current item's value
+										// Delete record from the local database - file will be uploaded as a new file
+										log.vlog("OneDrive returned a 'HTTP 412 - Precondition Failed' - gracefully handling error");
+										itemdb.deleteById(item.driveId, item.id);
+										return;
+									}
+								}
 								writeln("done.");
 							}		
 						} else {
@@ -1034,7 +1052,7 @@ final class SyncEngine
 							saveItem(response);
 						}
 						log.fileOnly("Uploading file ", path, " ... done.");
-						// use the cTag instead of the eTag because OneDrive may update the metadata of files AFTER they have been uploaded
+						// use the cTag instead of the eTag because OneDrive may update the metadata of files AFTER they have been uploaded via simple upload
 						eTag = response["cTag"].str;
 					}
 					if (accountType == "personal"){

src/upload.d

@@ -92,13 +92,17 @@ struct UploadSession
 				} else {
 					// unable to read the local file
 					log.vlog("Restore file upload session failed - unable to read the local file");
+					if (exists(sessionFilePath)) {
 						remove(sessionFilePath);
+					}
 					return false;
 				}
 			} else {
 				// session file contains an error - cant resume
 				log.vlog("Restore file upload session failed - cleaning up session resume");
+				if (exists(sessionFilePath)) {
 					remove(sessionFilePath);
+				}
 				return false;
 			}
 		}
@@ -136,14 +140,18 @@ struct UploadSession
 				save();
 			} catch (OneDriveException e) {
 				// there was an error remove session file
+				if (exists(sessionFilePath)) {
 					remove(sessionFilePath);
+				}
 				return response;
 			}
 		}
 		// upload complete
 		p.next();
 		writeln();
+		if (exists(sessionFilePath)) {
 			remove(sessionFilePath);
+		}
 		return response;
 	}