Python: basic, package install, error handler for begining

Signed-off-by: Václav Valíček <valicek1994@gmail.com>

repo_cloner/lib/dir_not_found_error.py

@@ -0,0 +1,15 @@
+from pathlib import PosixPath
+
+
+class DirNotFoundError(OSError):
+
+	def __str__(self):
+		if len(self.args) >= 1:
+			path: str = ""
+			if isinstance(self.args[0], PosixPath):
+				path = str(PosixPath(self.args[0]))
+			else:
+				path = str(self.args[0])
+			return f"Directory does not exist / is not a dir: {path}"
+		else:
+			return super.__str__(self)

repo_cloner/lib/repo_dir_structure.py

@@ -0,0 +1,44 @@
+import os.path
+from repo_cloner.lib.dir_not_found_error import DirNotFoundError
+
+
+class RepoDirStructure():
+	_base_dir: str = ""
+	_conf_dir: str = ""
+	_cache_dir: str = ""
+	_repos_dir: str = ""
+
+	def __init__(self, base_dir: str):
+		self._base_dir = base_dir
+		self._conf_dir = os.path.join(self._base_dir, "config")
+		self._cache_dir = os.path.join(self._base_dir, "cache")
+		self._repos_dir = os.path.join(self._base_dir, "repos")
+
+	@property
+	def exists(self) -> bool:
+		if not os.path.isdir(self._base_dir):
+			raise DirNotFoundError(self._base_dir)
+		if not os.path.isdir(self._conf_dir):
+			raise DirNotFoundError(self._conf_dir)
+		if not os.path.isdir(self._cache_dir):
+			raise DirNotFoundError(self._cache_dir)
+		if not os.path.isdir(self._repos_dir):
+			raise DirNotFoundError(self._repos_dir)
+
+		return True
+
+	@property
+	def base_dir(self) -> str:
+		return self._base_dir
+
+	@property
+	def cache_dir(self) -> str:
+		return self._cache_dir
+
+	@property
+	def conf_dir(self) -> str:
+		return self._conf_dir
+
+	@property
+	def repos_dir(self) -> str:
+		return self._repos_dir