WIP - Allow users to specify instance versions

We add support for specifying instance versions in
`parameters.components`. Commodore falls back to the version/url/path
specified for the component when the keys are not provided for component
aliases.

Note that the actual dependency handling doesn't yet support overriding
URL/path for aliases.

commodore/compile.py

@@ -194,7 +194,7 @@ def setup_compile_environment(config: Config) -> tuple[dict[str, Any], Iterable[
     config.register_component_deprecations(cluster_parameters)
     # Raise exception if component version override without URL is present in the
     # hierarchy.
-    verify_version_overrides(cluster_parameters)
+    verify_version_overrides(cluster_parameters, config.get_component_aliases())
 
     for component in config.get_components().values():
         ckey = component.parameters_key

commodore/component/__init__.py

@@ -89,6 +89,10 @@ def version(self, version: str):
     def repo_directory(self) -> P:
         return self._dir
 
+    @property
+    def sub_path(self) -> str:
+        return self._sub_path
+
     @property
     def target_directory(self) -> P:
         return self.alias_directory(self.name)

commodore/dependency_mgmt/__init__.py

@@ -88,7 +88,7 @@ def fetch_components(cfg: Config):
     component_names, component_aliases = _discover_components(cfg)
     click.secho("Registering component aliases...", bold=True)
     cfg.register_component_aliases(component_aliases)
-    cspecs = _read_components(cfg, component_names)
+    cspecs = _read_components(cfg, component_aliases)
     click.secho("Fetching components...", bold=True)
     for cn in component_names:
         cspec = cspecs[cn]
@@ -114,8 +114,14 @@ def fetch_components(cfg: Config):
             continue
 
         c = components[component]
-        # TODO: Set alias version instead of component version
-        c.register_alias(alias, c.version or "")
+        aspec = cspecs[alias]
+        if aspec.url != c.repo_url or aspec.path != c._sub_path:
+            # TODO: Figure out how we'll handle URL/subpath overrides
+            raise NotImplementedError(
+                "URL/path override for component alias not supported"
+            )
+        print(alias, aspec)
+        c.register_alias(alias, aspec.version)
         c.checkout_alias(alias)
 
         create_alias_symlinks(cfg, c, alias)
@@ -131,7 +137,7 @@ def register_components(cfg: Config):
     click.secho("Discovering included components...", bold=True)
     try:
         components, component_aliases = _discover_components(cfg)
-        cspecs = _read_components(cfg, components)
+        cspecs = _read_components(cfg, component_aliases)
     except KeyError as e:
         raise click.ClickException(f"While discovering components: {e}")
     click.secho("Registering components and aliases...", bold=True)
@@ -174,8 +180,10 @@ def register_components(cfg: Config):
             continue
 
         c = registered_components[cn]
-        # TODO: Set alias version
-        c.register_alias(alias, c.version)
+        aspec = cspecs[alias]
+        if aspec.url != c.repo_url or aspec.path != c.sub_path:
+            raise NotImplementedError("Changing alias sub path / URL NYI")
+        c.register_alias(alias, aspec.version)
         if not component_dir(cfg.work_dir, alias).is_dir():
             raise click.ClickException(f"Missing alias checkout for '{alias} as {cn}'")
 
@@ -238,9 +246,13 @@ def register_packages(cfg: Config):
         create_package_symlink(cfg, p, pkg)
 
 
-def verify_version_overrides(cluster_parameters):
+def verify_version_overrides(cluster_parameters, component_aliases: dict[str, str]):
     errors = []
+    aliases = set(component_aliases.keys()) - set(component_aliases.values())
     for cname, cspec in cluster_parameters["components"].items():
+        if cname in aliases:
+            # We don't require an url in component alias version configs
+            continue
         if "url" not in cspec:
             errors.append(f"component '{cname}'")
 

commodore/dependency_mgmt/version_parsing.py

@@ -2,6 +2,7 @@
 
 from collections.abc import Iterable
 from dataclasses import dataclass
+from typing import Optional
 
 from enum import Enum
 
@@ -33,18 +34,31 @@ class DependencySpec:
     path: str
 
     @classmethod
-    def parse(cls, info: dict[str, str]) -> DependencySpec:
-        if "url" not in info:
+    def parse(
+        cls,
+        info: dict[str, str],
+        base_config: Optional[DependencySpec] = None,
+    ) -> DependencySpec:
+        if "url" not in info and not base_config:
             raise DependencyParseError("url")
 
-        if "version" not in info:
+        if "version" not in info and not base_config:
             raise DependencyParseError("version")
 
         path = info.get("path", "")
         if path.startswith("/"):
             path = path[1:]
 
-        return DependencySpec(info["url"], info["version"], path)
+        if base_config:
+            url = info.get("url", base_config.url)
+            version = info.get("version", base_config.version)
+            if path not in info:
+                path = base_config.path
+        else:
+            url = info["url"]
+            version = info["version"]
+
+        return DependencySpec(url, version, path)
 
 
 def _read_versions(
@@ -53,6 +67,8 @@ def _read_versions(
     dependency_names: Iterable[str],
     require_key: bool = True,
     ignore_class_notfound: bool = False,
+    aliases: dict[str, str] = {},
+    fallback: dict[str, DependencySpec] = {},
 ) -> dict[str, DependencySpec]:
     deps_key = dependency_type.value
     deptype_str = dependency_type.name.lower()
@@ -71,15 +87,26 @@ def _read_versions(
         # just set deps to the empty dict.
         deps = {}
 
+    if aliases:
+        all_dep_keys = set(aliases.keys())
+    else:
+        all_dep_keys = deps.keys()
     for depname in dependency_names:
-        if depname not in deps:
+        if depname not in all_dep_keys:
             raise click.ClickException(
                 f"Unknown {deptype_str} '{depname}'."
                 + f" Please add it to 'parameters.{deps_key}'"
             )
 
         try:
-            dep = DependencySpec.parse(deps[depname])
+            basename_for_dep = aliases.get(depname, depname)
+            print(depname, basename_for_dep)
+            print(deps.get(depname, {}))
+            print(fallback.get(basename_for_dep))
+            dep = DependencySpec.parse(
+                deps.get(depname, {}),
+                base_config=fallback.get(basename_for_dep),
+            )
         except DependencyParseError as e:
             raise click.ClickException(
                 f"{deptype_cap} '{depname}' is missing field '{e.field}'"
@@ -96,9 +123,26 @@ def _read_versions(
 
 
 def _read_components(
-    cfg: Config, component_names: Iterable[str]
+    cfg: Config, component_aliases: dict[str, str]
 ) -> dict[str, DependencySpec]:
-    return _read_versions(cfg, DepType.COMPONENT, component_names)
+    component_names = set(component_aliases.values())
+    alias_names = set(component_aliases.keys()) - component_names
+
+    component_versions = _read_versions(cfg, DepType.COMPONENT, component_names)
+    alias_versions = _read_versions(
+        cfg,
+        DepType.COMPONENT,
+        alias_names,
+        aliases=component_aliases,
+        fallback=component_versions,
+    )
+
+    for alias, aspec in alias_versions.items():
+        if alias in component_versions:
+            raise ValueError("alias name already in component_versions?")
+        component_versions[alias] = aspec
+
+    return component_versions
 
 
 def _read_packages(