jw.pkg.lib.util.get_profile_env(): Add function

Add a function get_profile_env(), a function returning environment
variables from /etc/profile. Pass add=True to add its contents to the
existing environment dictionary, overwriting old entries, or pass
False to get the pristine content.

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

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

@@ -298,3 +298,16 @@ async def get_password(args: Namespace|None=None, url: str|None=None, askpass_en
         if parsed.password is not None:
             return parsed.password
     return await run_askpass(askpass_env, AskpassKey.Password)
+
+async def get_profile_env(throw: bool=True, add=False) -> dict[str, str]: # export
+    env: dict[str,str]|None = None if add else {}
+    # Run bash, source /etc/profile, then print environment as NUL-separated key=value pairs
+    cmd = ['/bin/bash', '-lc', 'unset PROFILEREAD; source /etc/profile >/dev/null 2>&1; env -0']
+    stdout, stderr = await run_cmd(*cmd, throw=throw, output_encoding="bytes", verbose=True, env=env)
+    ret: dict[str, str] = {}
+    for entry in stdout.split(b"\0"):
+        if not entry:
+            continue
+        key, val = entry.split(b"=", 1)
+        ret[key.decode()] = val.decode()
+    return ret