Add unmount parameter

src/globaleaks_eph_fs/__init__.py

@@ -3,6 +3,7 @@
 import os
 import re
 import stat
+import subprocess
 import uuid
 import threading
 from fuse import FUSE, FuseOSError, Operations
@@ -14,7 +15,6 @@
 
 UUID4_PATTERN = re.compile(r'^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$', re.IGNORECASE)
 
-
 def is_valid_uuid4(filename):
     """
     Validates if the given filename follows the UUIDv4 format.
@@ -24,6 +24,24 @@ def is_valid_uuid4(filename):
     """
     return bool(UUID4_PATTERN.match(filename))
 
+def is_mount_point(path):
+    """
+    Checks if the given path is a mount point.
+
+    A mount point is a directory where a filesystem is attached. This function checks
+    if the provided path is currently being used as a mount point by querying the
+    system's mount information.
+
+    :param path: The directory path to check if it is a mount point.
+    :return: True if the given path is a mount point, otherwise False.
+    :raises Exception: If there is an error while running the 'mount' command or parsing the result.
+    """
+    try:
+        abs_path = os.path.abspath(path)
+        result = subprocess.run(['mount'], capture_output=True, text=True)
+        return any(abs_path in line for line in result.stdout.splitlines())
+    except:
+        return False
 
 class EphemeralFile:
     def __init__(self, filesdir, filename=None):
@@ -385,7 +403,16 @@ def main():
     parser = argparse.ArgumentParser(description="GLOBALEAKS EPH FS")
     parser.add_argument('mount_point', help="Path to mount the filesystem")
     parser.add_argument('--storage_directory', '-s', help="Optional storage directory. Defaults to a temporary directory.")
+    parser.add_argument('--unmount', '-u', action='store_true', help="Unmount the filesystem if it's mounted.")
     args = parser.parse_args()
+
+    if is_mount_point(args.mount_point):
+        print(f"Unmounting the filesystem at {args.mount_point}")
+        os.system(f"fusermount -u {args.mount_point}")
+
+    if args.unmount:
+        return
+
     EphemeralFS(args.mount_point, args.storage_directory, foreground=True)
 
 if __name__ == '__main__':