cmds.secrets: Make commands work remotely

The "secrets" class of commands currently only works on the host it's invoked on. Use the current FileContext to allow using the existing commands on a target host.
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/secrets/lib/DistroContext.py

@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+import re
+
+from pathlib import Path
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing import Iterable
+    from ....lib.FileContext import FileContext
+    from ...CmdDistro import CmdDistro
+
+from ....lib.log import *
+from ....lib.util import run_cmd
+
+from .base import Attrs
+from .FilesContext import FilesContext
+
+class DistroContext(FilesContext):
+
+    def __init__(self, distro: Distro) -> None:
+        super().__init__(distro.ctx)
+        self.__distro = distro
+
+    async def match_files(self, packages: Iterable[str], pattern: str) -> list[str]:
+        ret: list[str] = []
+        for package_name in packages:
+            for path in await self.__distro.pkg_files(package_name):
+                if re.match(pattern, path):
+                    ret.append(path)
+        return ret
+
+    async def list_template_files(self, packages: Iterable[str]) -> list[str]:
+        return await self.match_files(packages, pattern=r'.*\.jw-tmpl$')
+
+    async def list_secret_paths(self, packages: Iterable[str], ignore_missing: bool=False) -> list[str]:
+        ret = []
+        for tmpl in await self.list_template_files(packages):
+            path = str(Path(tmpl).with_suffix(".jw-secret"))
+            if ignore_missing and not self.ctx.file_exists(path):
+                continue
+            ret.append(path)
+        return ret
+
+    async def list_compilation_targets(self, packages: Iterable[str], ignore_missing: bool=False) -> list[str]:
+        ret = []
+        for tmpl in await self.list_template_files(packages):
+            path = tmpl.removesuffix('.jw-tmpl')
+            if ignore_missing and not self.ctx.file_exists(path):
+                continue
+            ret.append(path)
+        return ret
+
+    async def remove_compilation_targets(self, packages: Iterable[str]) -> list[str]:
+        for path in await self.list_compilation_targets(packages):
+            try:
+                self.ctx.stat(path)
+                log(NOTICE, f'Removing {path}')
+                await self.ctx.unlink(path)
+            except FileNotFoundError as e:
+                log(DEBUG, f'Compilation target {path} doesn\'t exist (ignored)')
+                continue
+
+    async def compile_template_files(self, packages: Iterable[str], default_attrs: Attrs) -> list[str]:
+        missing = 0
+        for target in await self.list_compilation_targets(packages):
+            if not await self.compile_template_file(target, default_attrs):
+                missing += 1
+        if missing > 0:
+            log(WARNING, f'{missing} missing secrets found. You might want to add them and run sudo {app.cmdline} again')