Hi.

"borg umount" command does not work if fuse package is not installed.
"borg umount" requires the fusermount command :

# borg umount /mnt/restore/
Local Exception.
Traceback (most recent call last):
  File "/usr/lib64/python3.4/site-packages/borg/archiver.py", line 2089, in main
    exit_code = archiver.run(args)
  File "/usr/lib64/python3.4/site-packages/borg/archiver.py", line 2025, in run
    return func(args)
  File "/usr/lib64/python3.4/site-packages/borg/archiver.py", line 574, in do_umount
    return umount(args.mountpoint)
  File "borg/platform_linux.pyx", line 148, in borg.platform_linux.umount (borg/platform_linux.c:4219)
  File "/usr/lib64/python3.4/subprocess.py", line 534, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib64/python3.4/subprocess.py", line 856, in __init__
    restore_signals, start_new_session)
  File "/usr/lib64/python3.4/subprocess.py", line 1460, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'fusermount'

Platform: Linux zabbix 3.10.0-514.10.2.el7.x86_64 #1 SMP Fri Mar 3 00:04:05 UTC 2017 x86_64 x86_64
Linux: CentOS Linux 7.3.1611 Core
Borg: 1.0.10  Python: CPython 3.4.5
PID: 23969  CWD: /root
sys.argv: ['/usr/bin/borg', 'umount', '/mnt/restore/']
SSH_ORIGINAL_COMMAND: None


After installing fuse, the "borg umount" command works.
I have only tested in EPEL 7, I think this bug applies to Fedora packages too.