jw.pkg.util: Add sudo()

Move the body of BackendCmd.sudo() into a function. The rationale
behind that is that its functionality is independent of the calling
object for the most part, so having it in a function instead of a
method is the more modular pattern.

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

src/python/jw/pkg/cmds/distro/backend/BackendCmd.py

@@ -1,8 +1,6 @@
 # -*- coding: utf-8 -*-
 
-import os
-
-from ....lib.util import run_cmd
+from ....lib.util import run_cmd, run_sudo
 from ..Cmd import Cmd
 
 class BackendCmd:
@@ -11,21 +9,7 @@ class BackendCmd:
         self.__parent = parent
 
     async def _sudo(self, cmd: list[str], mod_env: dict[str, str] = {}, opts: list[str]=[]):
-        env: dict[str, str]|None = None
-        cmd_input: str|None = None
-        if mod_env:
-            env = os.environ.copy()
-            env.update(mod_env)
-        cmdline = []
-        if os.getuid() != 0:
-            cmdline.append('/usr/bin/sudo')
-            if env is not None:
-                cmdline.append('--preserve-env=' + ','.join(mod_env.keys()))
-            cmdline.extend(opts)
-        cmdline.extend(cmd)
-        if self.interactive:
-            cmd_input = "mode:interactive"
-        stdout, stderr = await run_cmd(*cmdline, throw=True, verbose=True, env=env, cmd_input=cmd_input)
+        return await run_sudo(cmd, mod_env=mod_env, opts=opts, interactive=self.interactive)
 
     @property
     def parent(self):

src/python/jw/pkg/lib/util.py

@@ -213,6 +213,24 @@ async def run_askpass(askpass_env: list[str], key: AskpassKey, host: str|None=No
             return ret
     return None
 
+async def run_sudo(cmd: list[str], mod_env: dict[str, str] = {}, opts: list[str]=[], interactive: bool=True):
+    env: dict[str, str]|None = None
+    cmd_input: str|None = None
+    if mod_env:
+        env = os.environ.copy()
+        env.update(mod_env)
+    cmdline = []
+    if os.getuid() != 0:
+        cmdline.append('/usr/bin/sudo')
+        if env is not None:
+            cmdline.append('--preserve-env=' + ','.join(mod_env.keys()))
+        cmdline.extend(opts)
+    cmdline.extend(cmd)
+    if interactive:
+        cmd_input = "mode:interactive"
+    stdout, stderr = await run_cmd(*cmdline, throw=True, verbose=True, env=env, cmd_input=cmd_input)
+    return stdout, stderr
+
 async def get_username(args: Namespace|None=None, url: str|None=None, askpass_env: list[str]=[]) -> str: # export
     url_user = None if url is None else urlparse(url).username
     if args is not None: