nix: Make nix the root

Which means now I'll have to think about real prefixes in commit names.

os/wireless/.gitignore

@@ -0,0 +1,2 @@
+networks.json
+networks.env

os/wireless/import.py

@@ -0,0 +1,164 @@
+#!/usr/bin/env python3
+
+"""
+Exports Wi-Fi networks configuration stored in pass into a format readable by Nix.
+"""
+
+# TODO EAP ca_cert=/etc/ssl/... probably won't work. Example fix:
+# builtins.fetchurl {
+#     url = "https://letsencrypt.org/certs/isrgrootx1.pem";
+#     sha256 = "sha256:1la36n2f31j9s03v847ig6ny9lr875q3g7smnq33dcsmf2i5gd92";
+# }
+
+import hashlib
+import json
+import os
+import subprocess
+
+import yaml
+
+# passpy doesn't handle encoding properly, so doing this with calls
+
+PASSWORD_STORE = os.path.expanduser("~/.password-store")
+SUBFOLDER = "wifi"
+SEPARATE_PASSWORDS = False
+# TODO Find a way to make then env file available at whatever time it is needed
+
+
+class Password:
+    all: list["Password"] = list()
+
+    def __init__(self, path: str, content: str):
+        self.path = path
+        self.content = content
+
+        Password.all.append(self)
+
+    def var(self) -> str:
+        # return self.path.split("/")[-1].upper()
+        m = hashlib.sha256()
+        m.update(self.path.encode())
+        return m.hexdigest().upper()
+
+    def val(self) -> str:
+        return self.content
+
+    def exists(self) -> bool:
+        return not not self.content
+
+    def key(self) -> str:
+        if SEPARATE_PASSWORDS:
+            return f"@{self.var()}@"
+        else:
+            return self.val()
+
+    @classmethod
+    def vars(cls) -> dict[str, str]:
+        vars = dict()
+        for password in cls.all:
+            if not password.content:
+                continue
+            var = password.var()
+            assert var not in vars, f"Duplicate key: {var}"
+            vars[var] = password.val()
+        return vars
+
+
+def list_networks() -> list[str]:
+    paths = []
+    pass_folder = os.path.join(PASSWORD_STORE, SUBFOLDER)
+    for filename in os.listdir(pass_folder):
+        if not filename.endswith(".gpg"):
+            continue
+        filepath = os.path.join(pass_folder, filename)
+        if not os.path.isfile(filepath):
+            continue
+
+        file = filename[:-4]
+        path = os.path.join(SUBFOLDER, file)
+        paths.append(path)
+    return paths
+
+
+def format_wpa_supplicant_conf(conf: dict, indent: str = "") -> str:
+    lines = []
+    for k, v in conf.items():
+        if isinstance(v, str):
+            val = '"' + v.replace('"', '\\"') + '"'
+        elif isinstance(v, Password):
+            val = v.key()
+        elif isinstance(v, list):
+            assert all(
+                map(lambda i: isinstance(i, str), v)
+            ), "Only list of strings supported"
+            val = " ".join(v)
+        else:
+            val = str(v)
+        lines.append(f"{indent}{k}={val}")
+    return "\n".join(lines)
+
+
+networks = {}
+for path in list_networks():
+    proc = subprocess.run(["pass", path], stdout=subprocess.PIPE)
+    proc.check_returncode()
+
+    raw = proc.stdout.decode()
+    split = raw.split("\n")
+
+    password = Password(path, split[0])
+    data = yaml.safe_load("\n".join(split[1:])) or dict()
+    # print(path, data)  # DEBUG
+
+    # Helpers to prevent repetition
+    suffixes = data.pop("suffixes", [""])
+    data.setdefault("key_mgmt", ["WPA-PSK"] if password.exists() else ["NONE"])
+    if password:
+        if any(map(lambda m: "PSK" in m.split("-"), data["key_mgmt"])):
+            data["psk"] = password
+        if "NONE" in data["key_mgmt"]:
+            data["wep_key0"] = password
+        if any(map(lambda m: "EAP" in m.split("-"), data["key_mgmt"])):
+            data["password"] = password
+    assert "ssid" in data, f"{path}: Missing SSID"
+
+    # # Output wpa_supplicant conf, for debug
+    # for suffix in suffixes:
+    #     wpas = data.copy()
+    #     wpas["ssid"] += suffix
+    #     print(f"# {path}")
+    #     print("network={")
+    #     print(format_wpa_supplicant_conf(wpas, indent="    "))
+    #     print("}")
+    #     print()
+
+    # Convert to nix configuration
+    ssid = data.pop("ssid")
+    network = {}
+    key_mgmt = data.pop("key_mgmt", None)
+    psk = data.pop("psk", None)
+    priority = data.pop("priority", None)
+    # No support for hidden
+    # No support for extraConfig (all is assumed to be auth)
+    if key_mgmt:
+        network["authProtocols"] = key_mgmt
+    if psk:
+        network["psk"] = psk.key()
+        if data:
+            raise NotImplementedError(f"{path}: Unhandled non-auth extra: {data}")
+    else:
+        if data:
+            network["auth"] = format_wpa_supplicant_conf(data)
+    if priority:
+        network["priority"] = int(priority)
+
+    for suffix in suffixes:
+        networks[ssid + suffix] = network
+
+with open("networks.json", "w") as fd:
+    json.dump(networks, fd, indent=4)
+
+with open("networks.env", "w") as fd:
+    if SEPARATE_PASSWORDS:
+        for k, v in Password.vars().items():
+            print(f"{k}={v}", file=fd)