common fstab and libc funcs

kvmd/fstab.py

@@ -0,0 +1,50 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2022  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import re
+import dataclasses
+
+
+# =====
+@dataclasses.dataclass(frozen=True)
+class FstabStorage:
+    mount_path: str
+    root_path: str
+    user: str
+
+
+def find_storage(target: str) -> FstabStorage:
+    fstab_path = "/etc/fstab"
+    with open(fstab_path) as file:
+        for line in file.read().split("\n"):
+            line = line.strip()
+            if line and not line.startswith("#"):
+                parts = line.split()
+                if len(parts) == 6:
+                    options = dict(re.findall(r"X-kvmd\.%s-(root|user)(?:=([^,]+))?" % (target), parts[3]))
+                    if options:
+                        return FstabStorage(
+                            mount_path=parts[1],
+                            root_path=(options.get("root", "") or parts[1]),
+                            user=options.get("user", ""),
+                        )
+    raise RuntimeError(f"Can't find {target!r} mountpoint in {fstab_path}")