Improve args parsing and checks

nextcloud_backup.py

@@ -5,11 +5,12 @@ from logging import getLogger, basicConfig, DEBUG, INFO, WARN, ERROR, CRITICAL
 from subprocess import run, PIPE, CalledProcessError
 from json import loads
 from tempfile import NamedTemporaryFile, _TemporaryFileWrapper
-from os import environ
+from os import environ, access, X_OK
 from sys import stderr
 from argparse import ArgumentParser, BooleanOptionalAction, ArgumentTypeError
 from pathlib import Path
-from typing import Optional, Any
+from typing import Optional, Any, Dict
+from shutil import which
 
 
 log_levels = {
@@ -21,6 +22,37 @@ log_levels = {
 }
 
 
+def executable(value: str) -> Path:
+    """
+    Check if the argument is a valid executable
+
+    :param value: Raw path to executable file
+    :return: Path to executable file
+    """
+    path = which(value)
+    if not path:
+        raise ArgumentTypeError(f"{value} not found")
+    path = Path(path)
+    if not access(path, X_OK):
+        raise ArgumentTypeError(f"{value} is not executable")
+    return path
+
+
+def directory(value: str) -> Path:
+    """
+    Check if the argument is an existing directory
+
+    :param value: Raw path
+    :return: Path
+    """
+    path = Path(value)
+    if not path.exists():
+        raise ArgumentTypeError(f"{value} doesn't exist")
+    if not path.is_dir():
+        raise ArgumentTypeError(f"{value} is not a directory")
+    return path
+
+
 class NextcloudBackup:
     """
     Nextcloud backup class
@@ -335,6 +367,19 @@ class NextcloudBackup:
         TODO/WIP
         """
 
+    def tests(self):
+        """
+        Launch all tests
+        """
+        if not self.test_nextcloud():
+            raise ValueError("Nextcloud check faild")
+
+        if not self.test_db():
+            raise ValueError("Database check faild")
+
+        if not self.test_s3():
+            raise ValueError("S3 check faild")
+
 
 def main():
     """
@@ -347,11 +392,13 @@ def main():
                     help="Verbosity (between 1-4 occurrences with more leading to more "
                          "verbose logging). CRITICAL=0, ERROR=1, WARN=2, INFO=3, "
                          "DEBUG=4")
+    parser.add_argument("--log-file", "-f", type=Path)
+    parser.add_argument("--php", "-p", default="php", type=executable)
+    parser.add_argument("--nextcloud", "-n", default="/opt/nextcloud", type=directory)
+    parser.add_argument("--backup", "-b", default="/opt/backupnextcloud", type=directory)
+
 
     parser_backup = subparsers.add_parser("backup")
-    parser_backup.add_argument("--php", "-p", default="php", type=Path)
-    parser_backup.add_argument("--nextcloud", "-n", default="/opt/nextcloud", type=Path)
-    parser_backup.add_argument("--backup", "-b", default="/opt/backupnextcloud", type=Path)
     parser_backup.add_argument("--maintenance", "-m",
                                action=BooleanOptionalAction, default=True)
     parser_backup.add_argument("--rclone-remote-control", "-r",
@@ -359,10 +406,17 @@ def main():
 
 
     parser_check = subparsers.add_parser("check")
-    parser_check.add_argument("--backup", "-b", default="/opt/backupnextcloud", type=Path)
 
     args = parser.parse_args()
-    basicConfig(level=log_levels[args.verbosity])
+    logging_confg : Dict[str, Any]  = {
+        "level": log_levels[args.verbosity]
+    }
+
+    if "file_log" in args and args.file_log:
+        logging_confg["filename"] = args.log_file
+        logging_confg["filemode"] = "a"
+
+    basicConfig(**logging_confg)
 
     if not args.nextcloud.exists() or not args.nextcloud.is_dir():
         raise ArgumentTypeError("Invalid Nextcloud path")
@@ -370,23 +424,14 @@ def main():
     if not args.backup.exists() or not args.backup.is_dir():
         raise ArgumentTypeError("Invalid backup path")
 
-    nextcloud = {
-        "php": args.php,
-        "path": args.nextcloud
-    }
+    nb = NextcloudBackup({"php": args.php, "path": args.nextcloud}, args.backup)
 
-    nb = NextcloudBackup(nextcloud, args.backup)
+    try:
+        nb.tests()
+    except ValueError as e:
+        nb.logger.error(str(e))
 
     if args.action == "backup":
-        if not nb.test_nextcloud():
-            raise ArgumentTypeError("Nextcloud check faild")
-
-        if not nb.test_db():
-            raise ArgumentTypeError("Database check faild")
-
-        if not nb.test_s3():
-            raise ArgumentTypeError("S3 check faild")
-
         nb.backup(args.maintenance, args.rclone_remote_control)
     elif args.action == "check":
         nb.check()