config: add data schemas based on munch in scheme.py, add unit tests

README.md

@@ -3,7 +3,7 @@
 Kupfer Linux bootstrapping tool - drives pacstrap, makepkg, mkfs and fastboot, just to name a few.
 
 ## Installation
-Install Docker, Python 3 with libraries `click`, `appdirs`, `joblib`, `toml`, `typing_extentions`, and `coloredlogs` and put `bin/` into your `PATH`.
+Install Docker, Python 3 with the libraries from `requirements.txt` and put `bin/` into your `PATH`.
 Then use `kupferbootstrap`.
 
 ## Usage

config/scheme.py

@@ -0,0 +1,159 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Optional, Union, Mapping, Any, get_type_hints, get_origin, get_args, Iterable
+from munch import Munch
+
+
+def munchclass(*args, init=False, **kwargs):
+    return dataclass(*args, init=init, **kwargs)
+
+
+def resolve_type_hint(hint: type):
+    origin = get_origin(hint)
+    args: Iterable[type] = get_args(hint)
+    if origin is Optional:
+        args = set(list(args) + [type(None)])
+    if origin in [Union, Optional]:
+        results = []
+        for arg in args:
+            results += resolve_type_hint(arg)
+        return results
+    return [origin or hint]
+
+
+class DataClass(Munch):
+
+    def __init__(self, validate: bool = True, **kwargs):
+        self.update(kwargs, validate=validate)
+
+    @classmethod
+    def transform(cls, values: Mapping[str, Any], validate: bool = True) -> Any:
+        results = {}
+        values = dict(values)
+        for key in list(values.keys()):
+            value = values.pop(key)
+            type_hints = cls._type_hints
+            if key in type_hints:
+                _classes = tuple(resolve_type_hint(type_hints[key]))
+                if issubclass(_classes[0], dict):
+                    assert isinstance(value, dict)
+                    target_class = _classes[0]
+                    if not issubclass(_classes[0], Munch):
+                        target_class = DataClass
+                    if not isinstance(value, target_class):
+                        value = target_class.fromDict(value, validate=validate)
+                if validate:
+                    if not isinstance(value, _classes):
+                        raise Exception(f'key "{key}" has value of wrong type {_classes}: {value}')
+            elif validate:
+                raise Exception(f'Unknown key "{key}"')
+            else:
+                if isinstance(value, dict) and not isinstance(value, Munch):
+                    value = DataClass.fromDict(value)
+            results[key] = value
+        if values:
+            if validate:
+                raise Exception(f'values contained unknown keys: {list(values.keys())}')
+            results |= values
+
+        return results
+
+    @classmethod
+    def fromDict(cls, values: Mapping[str, Any], validate: bool = True):
+        return cls(**cls.transform(values, validate))
+
+    def update(self, d: Mapping[str, Any], validate: bool = True):
+        Munch.update(self, type(self).transform(d, validate))
+
+    def __init_subclass__(cls):
+        super().__init_subclass__()
+        cls._type_hints = get_type_hints(cls)
+
+
+@munchclass()
+class Profile(DataClass):
+    parent: str
+    device: str
+    flavour: str
+    pkgs_include: list[str]
+    pkgs_exclude: list[str]
+    hostname: str
+    username: str
+    password: Optional[str]
+    size_extra_mb: Union[str, int]
+
+
+@munchclass()
+class WrapperSection(DataClass):
+    type: str  # NOTE: rename to 'wrapper_type' if this causes problems
+
+
+@munchclass()
+class BuildSection(DataClass):
+    ccache: bool
+    clean_mode: bool
+    crosscompile: bool
+    crossdirect: bool
+    threads: int
+
+
+@munchclass()
+class PkgbuildsSection(DataClass):
+    git_repo: str
+    git_branch: str
+
+
+@munchclass()
+class PacmanSection(DataClass):
+    parallel_downloads: int
+    check_space: bool
+    repo_branch: str
+
+
+@munchclass()
+class PathsSection(DataClass):
+    cache_dir: str
+    chroots: str
+    pacman: str
+    packages: str
+    pkgbuilds: str
+    jumpdrive: str
+    images: str
+
+
+@munchclass()
+class ProfilesSection(DataClass):
+    current: str
+    default: Profile
+
+
+@munchclass()
+class Config(DataClass):
+    wrapper: WrapperSection
+    build: BuildSection
+    pkgbuilds: PkgbuildsSection
+    pacman: PacmanSection
+    paths: PathsSection
+    profiles: ProfilesSection
+
+    @classmethod
+    def fromDict(cls, values: Mapping[str, Any], validate: bool = True, allow_incomplete: bool = False):
+        values = dict(values)  # copy for later modification
+        _vals = {}
+        for name, _class in cls._type_hints.items():
+            if name not in values:
+                if not allow_incomplete:
+                    raise Exception(f'Config key {name} not found')
+                continue
+            value = values.pop(name)
+            if not isinstance(value, _class):
+                value = _class.fromDict(value, validate=validate)
+            _vals[name] = value
+
+        if values:
+            if validate:
+                raise Exception(f'values contained unknown keys: {list(values.keys())}')
+            _vals |= values
+
+        return Config(**_vals, validate=validate)

config/test_config.py

@@ -5,7 +5,8 @@ from tempfile import mktemp, gettempdir as get_system_tempdir
 import toml
 from typing import Optional
 
-from config import CONFIG_DEFAULTS, ConfigStateHolder, Profile
+from config import CONFIG_DEFAULTS, ConfigStateHolder, PROFILE_DEFAULTS
+from config.scheme import Config, Profile
 
 
 def get_filename():
@@ -85,14 +86,17 @@ def dict_filter_out_None(d: dict):
     return {k: v for k, v in d.items() if v is not None}
 
 
-def compare_to_defaults(config: dict, defaults: dict = CONFIG_DEFAULTS):
+def compare_to_defaults(config: dict, defaults: dict = CONFIG_DEFAULTS, filter_None_from_defaults: Optional[bool] = None):
+    if filter_None_from_defaults is None:
+        filter_None_from_defaults = not isinstance(config, Config)
     # assert sections match
     assert config.keys() == defaults.keys()
     for section, section_defaults in defaults.items():
         assert section in config
         assert isinstance(section_defaults, dict)
         # Filter out None values from defaults - they're not written unless set
-        section_defaults = dict_filter_out_None(section_defaults)
+        if filter_None_from_defaults:
+            section_defaults = dict_filter_out_None(section_defaults)
         section_values_config = config[section]
         if section != 'profiles':
             assert section_values_config == section_defaults
@@ -101,8 +105,12 @@ def compare_to_defaults(config: dict, defaults: dict = CONFIG_DEFAULTS):
             assert CURRENT_KEY in section_defaults.keys()
             assert section_defaults.keys() == section_values_config.keys()
             assert section_defaults[CURRENT_KEY] == section_values_config[CURRENT_KEY]
-            for key in set(section_defaults.keys()) - set([CURRENT_KEY]):
+            for profile_name, profile in section_defaults.items():
-                assert dict_filter_out_None(section_defaults[key]) == section_values_config[key]
+                if profile_name == CURRENT_KEY:
+                    continue  # not a profile
+                if filter_None_from_defaults:
+                    profile = dict_filter_out_None(profile)
+                assert profile == section_values_config[profile_name]
 
 
 def load_toml_file(path) -> dict:
@@ -111,6 +119,7 @@ def load_toml_file(path) -> dict:
     assert text
     return toml.loads(text)
 
+
 def get_path_from_stateholder(c: ConfigStateHolder):
     return c.runtime['config_file']
 
@@ -141,8 +150,24 @@ def test_config_save_modified(configstate_emptyfile: ConfigStateHolder):
     compare_to_defaults(load_toml_file(get_path_from_stateholder(c)), defaults_modified)
 
 
+def test_config_scheme_defaults():
+    c = Config.fromDict(CONFIG_DEFAULTS, validate=True, allow_incomplete=False)
+    assert c
+    compare_to_defaults(c)
+
+
+def test_config_scheme_modified():
+    modifications = {'wrapper': {'type': 'none'}, 'build': {'crossdirect': False}}
+    assert set(modifications.keys()).issubset(CONFIG_DEFAULTS.keys())
+    d = {section_name: (section | modifications.get(section_name, {})) for section_name, section in CONFIG_DEFAULTS.items()}
+    c = Config.fromDict(d, validate=True, allow_incomplete=False)
+    assert c
+    assert c.build.crossdirect is False
+    assert c.wrapper.type == 'none'
+
+
 def test_profile():
     p = None
-    p = Profile()
+    p = Profile.fromDict(PROFILE_DEFAULTS)
     assert p is not None
-    assert isinstance(p, dict)
+    assert isinstance(p, Profile)

requirements.txt

@@ -4,3 +4,4 @@ joblib==1.0.1
 toml
 typing_extensions
 coloredlogs
+munch