refactor(release,version): centralize repository path resolution and validate template layout

- Introduce RepoPaths resolver as single source of truth for repository file locations
- Update release workflow to use resolved packaging and changelog paths
- Update version readers to rely on the shared path resolver
- Add integration test asserting pkgmgr repository satisfies canonical template layout

https://chatgpt.com/share/693eaa75-98f0-800f-adca-439555f84154

src/pkgmgr/actions/release/workflow.py

@@ -1,10 +1,13 @@
+# src/pkgmgr/actions/release/workflow.py
 from __future__ import annotations
-from typing import Optional
+
 import os
 import sys
+from typing import Optional
 
 from pkgmgr.actions.branch import close_branch
 from pkgmgr.core.git import get_current_branch, GitError
+from pkgmgr.core.repository.paths import resolve_repo_paths
 
 from .files import (
     update_changelog,
@@ -55,8 +58,12 @@ def _release_impl(
     print(f"New version:     {new_ver_str} ({release_type})")
 
     repo_root = os.path.dirname(os.path.abspath(pyproject_path))
+    paths = resolve_repo_paths(repo_root)
+
+    # --- Update versioned files ------------------------------------------------
 
     update_pyproject_version(pyproject_path, new_ver_str, preview=preview)
+
     changelog_message = update_changelog(
         changelog_path,
         new_ver_str,
@@ -64,38 +71,46 @@ def _release_impl(
         preview=preview,
     )
 
-    flake_path = os.path.join(repo_root, "flake.nix")
-    update_flake_version(flake_path, new_ver_str, preview=preview)
+    update_flake_version(paths.flake_nix, new_ver_str, preview=preview)
 
-    pkgbuild_path = os.path.join(repo_root, "PKGBUILD")
-    update_pkgbuild_version(pkgbuild_path, new_ver_str, preview=preview)
+    if paths.arch_pkgbuild:
+        update_pkgbuild_version(paths.arch_pkgbuild, new_ver_str, preview=preview)
+    else:
+        print("[INFO] No PKGBUILD found (packaging/arch/PKGBUILD or PKGBUILD). Skipping.")
 
-    spec_path = os.path.join(repo_root, "package-manager.spec")
-    update_spec_version(spec_path, new_ver_str, preview=preview)
+    if paths.rpm_spec:
+        update_spec_version(paths.rpm_spec, new_ver_str, preview=preview)
+    else:
+        print("[INFO] No RPM spec file found. Skipping spec version update.")
 
     effective_message: Optional[str] = message
     if effective_message is None and isinstance(changelog_message, str):
         if changelog_message.strip():
             effective_message = changelog_message.strip()
 
-    debian_changelog_path = os.path.join(repo_root, "debian", "changelog")
     package_name = os.path.basename(repo_root) or "package-manager"
 
-    update_debian_changelog(
-        debian_changelog_path,
-        package_name=package_name,
-        new_version=new_ver_str,
-        message=effective_message,
-        preview=preview,
-    )
+    if paths.debian_changelog:
+        update_debian_changelog(
+            paths.debian_changelog,
+            package_name=package_name,
+            new_version=new_ver_str,
+            message=effective_message,
+            preview=preview,
+        )
+    else:
+        print("[INFO] No debian changelog found. Skipping debian/changelog update.")
 
-    update_spec_changelog(
-        spec_path=spec_path,
-        package_name=package_name,
-        new_version=new_ver_str,
-        message=effective_message,
-        preview=preview,
-    )
+    if paths.rpm_spec:
+        update_spec_changelog(
+            spec_path=paths.rpm_spec,
+            package_name=package_name,
+            new_version=new_ver_str,
+            message=effective_message,
+            preview=preview,
+        )
+
+    # --- Git commit / tag / push ----------------------------------------------
 
     commit_msg = f"Release version {new_ver_str}"
     tag_msg = effective_message or commit_msg
@@ -103,12 +118,12 @@ def _release_impl(
     files_to_add = [
         pyproject_path,
         changelog_path,
-        flake_path,
-        pkgbuild_path,
-        spec_path,
-        debian_changelog_path,
+        paths.flake_nix,
+        paths.arch_pkgbuild,
+        paths.rpm_spec,
+        paths.debian_changelog,
     ]
-    existing_files = [p for p in files_to_add if p and os.path.exists(p)]
+    existing_files = [p for p in files_to_add if isinstance(p, str) and p and os.path.exists(p)]
 
     if preview:
         for path in existing_files:

src/pkgmgr/core/repository/paths.py

@@ -0,0 +1,124 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Central repository path resolver.
+
+Goal:
+- Provide ONE place to define where packaging / changelog / metadata files live.
+- Prefer modern layout (packaging/*) but stay backwards-compatible with legacy
+  root-level paths.
+
+Both:
+- readers (pkgmgr.core.version.source)
+- writers (pkgmgr.actions.release.workflow)
+
+should use this module instead of hardcoding paths.
+"""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+from typing import Iterable, Optional
+
+
+@dataclass(frozen=True)
+class RepoPaths:
+    repo_dir: str
+
+    pyproject_toml: str
+    flake_nix: str
+
+    # Human changelog (typically Markdown)
+    changelog_md: Optional[str]
+
+    # Packaging-related files
+    arch_pkgbuild: Optional[str]
+    debian_changelog: Optional[str]
+    rpm_spec: Optional[str]
+
+
+def _first_existing(candidates: Iterable[str]) -> Optional[str]:
+    for p in candidates:
+        if p and os.path.isfile(p):
+            return p
+    return None
+
+
+def _find_first_spec_in_dir(dir_path: str) -> Optional[str]:
+    if not os.path.isdir(dir_path):
+        return None
+    try:
+        for fn in sorted(os.listdir(dir_path)):
+            if fn.endswith(".spec"):
+                p = os.path.join(dir_path, fn)
+                if os.path.isfile(p):
+                    return p
+    except OSError:
+        return None
+    return None
+
+
+def resolve_repo_paths(repo_dir: str) -> RepoPaths:
+    """
+    Resolve canonical file locations for a repository.
+
+    Preferences (new layout first, legacy fallback second):
+      - PKGBUILD:            packaging/arch/PKGBUILD  -> PKGBUILD
+      - Debian changelog:    packaging/debian/changelog -> debian/changelog
+      - RPM spec:            packaging/fedora/package-manager.spec
+                             -> first *.spec in packaging/fedora
+                             -> first *.spec in repo root
+      - CHANGELOG.md:        CHANGELOG.md -> packaging/CHANGELOG.md (optional fallback)
+
+    Notes:
+      - This resolver only returns paths; it does not read/parse files.
+      - Callers should treat Optional paths as "may not exist".
+    """
+    repo_dir = os.path.abspath(repo_dir)
+
+    pyproject_toml = os.path.join(repo_dir, "pyproject.toml")
+    flake_nix = os.path.join(repo_dir, "flake.nix")
+
+    changelog_md = _first_existing(
+        [
+            os.path.join(repo_dir, "CHANGELOG.md"),
+            os.path.join(repo_dir, "packaging", "CHANGELOG.md"),
+        ]
+    )
+
+    arch_pkgbuild = _first_existing(
+        [
+            os.path.join(repo_dir, "packaging", "arch", "PKGBUILD"),
+            os.path.join(repo_dir, "PKGBUILD"),
+        ]
+    )
+
+    debian_changelog = _first_existing(
+        [
+            os.path.join(repo_dir, "packaging", "debian", "changelog"),
+            os.path.join(repo_dir, "debian", "changelog"),
+        ]
+    )
+
+    # RPM spec: prefer the canonical file, else first spec in packaging/fedora, else first spec in repo root.
+    rpm_spec = _first_existing(
+        [
+            os.path.join(repo_dir, "packaging", "fedora", "package-manager.spec"),
+        ]
+    )
+    if rpm_spec is None:
+        rpm_spec = _find_first_spec_in_dir(os.path.join(repo_dir, "packaging", "fedora"))
+    if rpm_spec is None:
+        rpm_spec = _find_first_spec_in_dir(repo_dir)
+
+    return RepoPaths(
+        repo_dir=repo_dir,
+        pyproject_toml=pyproject_toml,
+        flake_nix=flake_nix,
+        changelog_md=changelog_md,
+        arch_pkgbuild=arch_pkgbuild,
+        debian_changelog=debian_changelog,
+        rpm_spec=rpm_spec,
+    )

src/pkgmgr/core/version/source.py

@@ -1,3 +1,4 @@
+# src/pkgmgr/core/version/source.py
 from __future__ import annotations
 
 import os
@@ -6,6 +7,8 @@ from typing import Optional
 
 import yaml
 
+from pkgmgr.core.repository.paths import resolve_repo_paths
+
 
 def read_pyproject_version(repo_dir: str) -> Optional[str]:
     """
@@ -13,7 +16,8 @@ def read_pyproject_version(repo_dir: str) -> Optional[str]:
 
     Expects a PEP 621-style [project] table with a 'version' field.
     """
-    path = os.path.join(repo_dir, "pyproject.toml")
+    paths = resolve_repo_paths(repo_dir)
+    path = paths.pyproject_toml
     if not os.path.isfile(path):
         return None
 
@@ -39,7 +43,8 @@ def read_pyproject_project_name(repo_dir: str) -> Optional[str]:
     This is required to correctly resolve installed Python package
     versions via importlib.metadata.
     """
-    path = os.path.join(repo_dir, "pyproject.toml")
+    paths = resolve_repo_paths(repo_dir)
+    path = paths.pyproject_toml
     if not os.path.isfile(path):
         return None
 
@@ -65,7 +70,8 @@ def read_flake_version(repo_dir: str) -> Optional[str]:
     Looks for:
         version = "X.Y.Z";
     """
-    path = os.path.join(repo_dir, "flake.nix")
+    paths = resolve_repo_paths(repo_dir)
+    path = paths.flake_nix
     if not os.path.isfile(path):
         return None
 
@@ -84,15 +90,16 @@ def read_flake_version(repo_dir: str) -> Optional[str]:
 
 def read_pkgbuild_version(repo_dir: str) -> Optional[str]:
     """
-    Read the version from PKGBUILD in repo_dir.
+    Read the version from PKGBUILD (preferring packaging/arch/PKGBUILD).
 
     Combines pkgver and pkgrel if both exist:
       pkgver=1.2.3
       pkgrel=1
     -> 1.2.3-1
     """
-    path = os.path.join(repo_dir, "PKGBUILD")
-    if not os.path.isfile(path):
+    paths = resolve_repo_paths(repo_dir)
+    path = paths.arch_pkgbuild
+    if not path or not os.path.isfile(path):
         return None
 
     try:
@@ -117,13 +124,19 @@ def read_pkgbuild_version(repo_dir: str) -> Optional[str]:
 
 def read_debian_changelog_version(repo_dir: str) -> Optional[str]:
     """
-    Read the latest version from debian/changelog.
+    Read the latest version from debian changelog.
+
+    Preferred path:
+      packaging/debian/changelog
+    Fallback:
+      debian/changelog
 
     Expected format:
       package (1.2.3-1) unstable; urgency=medium
     """
-    path = os.path.join(repo_dir, "debian", "changelog")
-    if not os.path.isfile(path):
+    paths = resolve_repo_paths(repo_dir)
+    path = paths.debian_changelog
+    if not path or not os.path.isfile(path):
         return None
 
     try:
@@ -146,37 +159,40 @@ def read_spec_version(repo_dir: str) -> Optional[str]:
     """
     Read the version from an RPM spec file.
 
+    Preferred paths:
+      packaging/fedora/package-manager.spec
+      packaging/fedora/*.spec
+      repo_root/*.spec
+
     Combines:
       Version: 1.2.3
       Release: 1%{?dist}
     -> 1.2.3-1
     """
-    for fn in os.listdir(repo_dir):
-        if not fn.endswith(".spec"):
-            continue
+    paths = resolve_repo_paths(repo_dir)
+    path = paths.rpm_spec
+    if not path or not os.path.isfile(path):
+        return None
 
-        path = os.path.join(repo_dir, fn)
-        try:
-            with open(path, "r", encoding="utf-8") as f:
-                text = f.read()
-        except Exception:
-            return None
+    try:
+        with open(path, "r", encoding="utf-8") as f:
+            text = f.read()
+    except Exception:
+        return None
 
-        ver_match = re.search(r"^Version:\s*(.+)$", text, re.MULTILINE)
-        if not ver_match:
-            return None
-        version = ver_match.group(1).strip()
+    ver_match = re.search(r"^Version:\s*(.+)$", text, re.MULTILINE)
+    if not ver_match:
+        return None
+    version = ver_match.group(1).strip()
 
-        rel_match = re.search(r"^Release:\s*(.+)$", text, re.MULTILINE)
-        if rel_match:
-            release_raw = rel_match.group(1).strip()
-            release = release_raw.split("%", 1)[0].split(" ", 1)[0].strip()
-            if release:
-                return f"{version}-{release}"
+    rel_match = re.search(r"^Release:\s*(.+)$", text, re.MULTILINE)
+    if rel_match:
+        release_raw = rel_match.group(1).strip()
+        release = release_raw.split("%", 1)[0].split(" ", 1)[0].strip()
+        if release:
+            return f"{version}-{release}"
 
-        return version or None
-
-    return None
+    return version or None
 
 
 def read_ansible_galaxy_version(repo_dir: str) -> Optional[str]: