lib.Distro, ExecContext: Add classes, refactor lib.distro

The code below lib.distro, as left behind by the previous commit, is
geared towards being directly used as a command-line API. This commit
introduces the abstract base class Distro, a proxy for
distribution-specific interactions. The proxy abstracts distro
specifics into an API with proper method prototypes, not
argparse.Namespace contents, and can thus be more easily driven by
arbitrary code.

The Distro class is initialized with a member variable of type
ExecContext, another new class introduced by this commit. It is
designed to abstract the communication channel to the distribution
instance.  Currently only one specialization exists, Local, which
interacts with the distribution and root file system it is running
in, but is planned to be subclassed to support interaction via SSH,
serial, chroot, or chains thereof.

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

src/python/jw/pkg/lib/distros/suse/Delete.py

@@ -1,14 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from argparse import Namespace
-
-from ...Cmd import Cmd
-from ..BeDelete import BeDelete as Base
-
-class Delete(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def run(self, args: Namespace):
-        return await self.util.rpm(['-e', *args.names], sudo=True)

src/python/jw/pkg/lib/distros/suse/Distro.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
+from ...Distro import Distro as Base
+from ...pm.rpm import run_rpm, query_packages, list_files
+
+if TYPE_CHECKING:
+    from typing import Iterable
+    from ...ExecContext import Result
+    from ...Package import Package
+
+class Distro(Base):
+
+    async def zypper(self, args: list[str], verbose: bool=True, sudo: bool=True) -> Result:
+        cmd = ['/usr/bin/zypper']
+        if not self.interactive:
+            cmd.extend(['--non-interactive', '--gpg-auto-import-keys', '--no-gpg-checks'])
+        cmd.extend(args)
+        if sudo:
+            # Run sudo --login in case /etc/profile modifies ZYPP_CONF
+            return await self.sudo(cmd, opts=['--login'], verbose=verbose)
+        return await self.run(cmd, verbose=verbose)
+
+    async def rpm(self, *args, **kwargs) -> Result:
+        return await run_rpm(*args, **kwargs)
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    async def _ref(self) -> None:
+        return await self.zypper(['refresh'])
+
+    async def _dup(self, download_only: bool) -> None:
+        args = ['dup', '--force-resolution', '--auto-agree-with-licenses']
+        if download_only:
+            args.append('--download-only')
+        return await self.zypper(args)
+
+    async def _reboot_required(self, verbose: bool) -> bool:
+        opts = []
+        if not verbose:
+            pass
+            #opts.append('--quiet')
+        opts.append('needs-rebooting')
+        stdout, stderr, ret = await self.zypper(opts, sudo=False, verbose=verbose)
+        if ret != 0:
+            return True
+        return False
+
+    async def _select(self, names: Iterable[str]) -> Iterable[Package]:
+        return await query_packages(names)
+
+    async def _install(self, names: Iterable[str], only_update: bool) -> None:
+        cmd = 'update' if only_update else 'install'
+        return await self.zypper([cmd, *names])
+
+    async def _delete(self, names: Iterable[str]) -> None:
+        return await self.rpm(['-e', *names], sudo=True)
+
+    async def _pkg_files(self, name: str) -> Iterable[str]:
+        return await list_files(name)

src/python/jw/pkg/lib/distros/suse/Dup.py

@@ -1,17 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from argparse import Namespace
-
-from ...Cmd import Cmd
-from ..BeDup import BeDup as Base
-
-class Dup(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def run(self, args: Namespace):
-        zypper_args = ['dup', '--force-resolution', '--auto-agree-with-licenses']
-        if args.download_only:
-            zypper_args.append('--download-only')
-        return await self.util.zypper(zypper_args)

src/python/jw/pkg/lib/distros/suse/Install.py

@@ -1,15 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from argparse import Namespace
-
-from ...Cmd import Cmd
-from ..BeInstall import BeInstall as Base
-
-class Install(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def run(self, args: Namespace):
-        zypper_cmd = 'update' if args.only_update else 'install'
-        return await self.util.zypper([zypper_cmd, *args.packages])

src/python/jw/pkg/lib/distros/suse/Pkg.py

@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from typing import Iterable
-from argparse import Namespace
-
-from ...Package import Package
-from ...pm.rpm import list_files, query_packages
-from ...Cmd import Cmd
-from ..BePkg import BePkg as Base
-
-class Pkg(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def _files(self, name: str) -> Iterable[str]:
-        return await list_files(name)
-
-    async def _meta_data(self, names: Iterable[str]) -> Iterable[Package]:
-        return await query_packages(names)

src/python/jw/pkg/lib/distros/suse/RebootRequired.py

@@ -1,22 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from argparse import Namespace
-
-from ...Cmd import Cmd
-from ..BeRebootRequired import BeRebootRequired as Base
-
-class RebootRequired(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def run(self, args: Namespace):
-        opts = []
-        if not args.verbose:
-            pass
-            #opts.append('--quiet')
-        opts.append('needs-rebooting')
-        stdout, stderr, ret = await self.util.zypper(opts, sudo=False, verbose=args.verbose)
-        if ret != 0:
-            return 1
-        return 0

src/python/jw/pkg/lib/distros/suse/Refresh.py

@@ -1,14 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from argparse import Namespace
-
-from ...Cmd import Cmd
-from ..BeRefresh import BeRefresh as Base
-
-class Refresh(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def run(self, args: Namespace):
-        return await self.util.zypper(['refresh'])

src/python/jw/pkg/lib/distros/suse/Select.py

@@ -1,17 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from typing import Iterable
-from argparse import Namespace
-
-from ...Package import Package
-from ...pm.rpm import query_packages
-from ...Cmd import Cmd
-from ..BeSelect import BeSelect as Base
-
-class Select(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def _all_installed_packages(self) -> Iterable[Package]:
-        return await query_packages()

src/python/jw/pkg/lib/distros/suse/Util.py

@@ -1,25 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from ...util import run_cmd
-from ...Cmd import Cmd
-from ..Util import Util as Base
-
-from ...pm.rpm import run_rpm
-
-class Util(Base):
-
-    def __init__(self, parent: Cmd):
-        super().__init__(parent)
-
-    async def zypper(self, args: list[str], verbose: bool=False, sudo: bool=True):
-        cmd = ['/usr/bin/zypper']
-        if not self.interactive:
-            cmd.extend(['--non-interactive', '--gpg-auto-import-keys', '--no-gpg-checks'])
-        cmd.extend(args)
-        if sudo:
-            # Run sudo --login in case /etc/profile modifies ZYPP_CONF
-            return await self._sudo(cmd, opts=['--login'], verbose=verbose)
-        return await run_cmd(cmd, verbose=verbose)
-
-    async def rpm(self, *args, **kwargs):
-        return await run_rpm(*args, **kwargs)