cmds.distro: Move all modules to lib

Functions abstracting the distribution are not only needed in the
context of the distro subcommand, but also by other code, so make the
bulk of the code abstracting the distribution available in some place
more universally useful than below cmds.distro.

This commit leaves the source files mostly unchanged. They are only
patched to fix import paths, so that functionality is preserved.
Refactoring the code from command-line API to library API will be
done by the next commit.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/pm/dpkg.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+
+from typing import Iterable
+
+from ..util import run_cmd, run_sudo
+
+from ..Package import Package, meta_tags
+
+_meta_map: dict[str, str]|None = None
+
+def meta_map():
+    global _meta_map
+    if _meta_map is None:
+        _meta_map = Package.order_tags({
+            'name': 'binary:Package',
+            'vendor': None,   # deb doesn't have vendor field
+            'packager': None, #               -- packager --
+            'url': 'Homepage',
+            'maintainer': 'Maintainer',
+        })
+    return _meta_map
+
+async def run_dpkg(args: list[str], sudo: bool=False): # export
+    cmd = ['/usr/bin/dpkg']
+    cmd.extend(args)
+    if sudo:
+        return await run_sudo(cmd)
+    return await run_cmd(cmd)
+
+async def run_dpkg_query(args: list[str], sudo: bool=False): # export
+    cmd = ['/usr/bin/dpkg-query']
+    cmd.extend(args)
+    if sudo:
+        return await run_sudo(cmd)
+    return await run_cmd(cmd)
+
+async def query_packages(names: Iterable[str] = []) -> Iterable[Package]: # export
+    fmt_str = '|'.join([(f'${{{tag}}}' if tag else '') for tag in meta_map().values()]) + r'\n'
+    # dpkg-query -W -f='${binary:Package}|${Maintainer}| ... \n'
+    specs, stderr, status  = await run_dpkg_query(['-W', '-f=' + fmt_str, *names], sudo=False)
+    return Package.parse_specs_str(specs)
+
+async def list_files(pkg: str) -> list[str]: # export
+    file_list_str, stderr, status  = await run_dpkg(['-L', pkg], sudo=False)
+    return file_list_str.splitlines()