services/fuse/bin/arv-mount

   1 #!/usr/bin/env python
   2
   3 import argparse
   4 import arvados
   5 import daemon
   6 import logging
   7 import os
   8 import signal
   9 import subprocess
  10
  11 from arvados_fuse import *
  12
  13 logger = logging.getLogger('arvados.arv-mount')
  14
  15 if __name__ == '__main__':
  16     # Handle command line parameters
  17     parser = argparse.ArgumentParser(
  18         description='''Mount Keep data under the local filesystem.  Default mode is --home''',
  19         epilog="""
  20 Note: When using the --exec feature, you must either specify the
  21 mountpoint before --exec, or mark the end of your --exec arguments
  22 with "--".
  23 """)
  24     parser.add_argument('mountpoint', type=str, help="""Mount point.""")
  25     parser.add_argument('--allow-other', action='store_true',
  26                         help="""Let other users read the mount""")
  27
  28     mount_mode = parser.add_mutually_exclusive_group()
  29
  30     mount_mode.add_argument('--all', action='store_true', help="""Mount a subdirectory for each mode: home, shared, tags, portable data hash (default).""")
  31     mount_mode.add_argument('--home', action='store_true', help="""Mount only the user's home project.""")
  32     mount_mode.add_argument('--shared', action='store_true', help="""Mount only list of projects shared with the user.""")
  33     mount_mode.add_argument('--by-tag', action='store_true',
  34                             help="""Mount subdirectories listed by tag.""")
  35     mount_mode.add_argument('--by-hash', action='store_true',
  36                             help="""Mount subdirectories listed by portable data hash.""")
  37     mount_mode.add_argument('--project', type=str, help="""Mount a specific project.""")
  38     mount_mode.add_argument('--collection', type=str, help="""Mount only the specified collection.""")
  39
  40     parser.add_argument('--debug', action='store_true', help="""Debug mode""")
  41     parser.add_argument('--logfile', help="""Write debug logs and errors to the specified file (default stderr).""")
  42     parser.add_argument('--foreground', action='store_true', help="""Run in foreground (default is to daemonize unless --exec specified)""", default=False)
  43     parser.add_argument('--exec', type=str, nargs=argparse.REMAINDER,
  44                         dest="exec_args", metavar=('command', 'args', '...', '--'),
  45                         help="""Mount, run a command, then unmount and exit""")
  46
  47     args = parser.parse_args()
  48     args.mountpoint = os.path.realpath(args.mountpoint)
  49     if args.logfile:
  50         args.logfile = os.path.realpath(args.logfile)
  51
  52     # Daemonize as early as possible, so we don't accidentally close
  53     # file descriptors we're using.
  54     if not (args.exec_args or args.foreground):
  55         os.chdir(args.mountpoint)
  56         daemon_ctx = daemon.DaemonContext(working_directory='.')
  57         daemon_ctx.open()
  58     else:
  59         daemon_ctx = None
  60
  61     # Configure a logger based on command-line switches.
  62     # If we're using a contemporary Python SDK (mid-August 2014),
  63     # configure the arvados hierarchy logger.
  64     # Otherwise, configure the program root logger.
  65     base_logger = getattr(arvados, 'logger', None)
  66
  67     if args.logfile:
  68         log_handler = logging.FileHandler(args.logfile)
  69     elif daemon_ctx:
  70         log_handler = logging.NullHandler()
  71     elif base_logger:
  72         log_handler = arvados.log_handler
  73     else:
  74         log_handler = logging.StreamHandler()
  75
  76     if base_logger is None:
  77         base_logger = logging.getLogger()
  78     else:
  79         base_logger.removeHandler(arvados.log_handler)
  80     base_logger.addHandler(log_handler)
  81
  82     if args.debug:
  83         base_logger.setLevel(logging.DEBUG)
  84         logger.debug("arv-mount debugging enabled")
  85
  86     try:
  87         # Create the request handler
  88         operations = Operations(os.getuid(), os.getgid())
  89         api = arvados.api('v1')
  90
  91         usr = api.users().current().execute()
  92         if args.by_hash:
  93             # Set up the request handler with the 'magic directory' at the root
  94             operations.inodes.add_entry(MagicDirectory(llfuse.ROOT_INODE, operations.inodes, api))
  95         elif args.by_tag:
  96             operations.inodes.add_entry(TagsDirectory(llfuse.ROOT_INODE, operations.inodes, api))
  97         elif args.shared:
  98             operations.inodes.add_entry(SharedDirectory(llfuse.ROOT_INODE, operations.inodes, api, usr))
  99         elif args.home:
 100             operations.inodes.add_entry(ProjectDirectory(llfuse.ROOT_INODE, operations.inodes, api, usr))
 101         elif args.collection != None:
 102             # Set up the request handler with the collection at the root
 103             operations.inodes.add_entry(CollectionDirectory(llfuse.ROOT_INODE, operations.inodes, api, args.collection))
 104         elif args.project != None:
 105             operations.inodes.add_entry(ProjectDirectory(llfuse.ROOT_INODE, operations.inodes, api, api.groups().get(uuid=args.project).execute()))
 106         else:
 107             e = operations.inodes.add_entry(Directory(llfuse.ROOT_INODE))
 108             e._entries['home'] = operations.inodes.add_entry(ProjectDirectory(e.inode, operations.inodes, api, usr))
 109             e._entries['shared'] = operations.inodes.add_entry(SharedDirectory(e.inode, operations.inodes, api, usr))
 110             e._entries['by_tag'] = operations.inodes.add_entry(TagsDirectory(e.inode, operations.inodes, api))
 111             e._entries['by_hash'] = operations.inodes.add_entry(MagicDirectory(e.inode, operations.inodes, api))
 112
 113     except Exception:
 114         logger.exception("arv-mount: exception during API setup")
 115         exit(1)
 116
 117     # FUSE options, see mount.fuse(8)
 118     opts = [optname for optname in ['allow_other', 'debug']
 119             if getattr(args, optname)]
 120
 121     if args.exec_args:
 122         # Initialize the fuse connection
 123         llfuse.init(operations, args.mountpoint, opts)
 124
 125         t = threading.Thread(None, lambda: llfuse.main())
 126         t.start()
 127
 128         # wait until the driver is finished initializing
 129         operations.initlock.wait()
 130
 131         rc = 255
 132         try:
 133             sp = subprocess.Popen(args.exec_args, shell=False)
 134
 135             # forward signals to the process.
 136             signal.signal(signal.SIGINT, lambda signum, frame: sp.send_signal(signum))
 137             signal.signal(signal.SIGTERM, lambda signum, frame: sp.send_signal(signum))
 138             signal.signal(signal.SIGQUIT, lambda signum, frame: sp.send_signal(signum))
 139
 140             # wait for process to complete.
 141             rc = sp.wait()
 142
 143             # restore default signal handlers.
 144             signal.signal(signal.SIGINT, signal.SIG_DFL)
 145             signal.signal(signal.SIGTERM, signal.SIG_DFL)
 146             signal.signal(signal.SIGQUIT, signal.SIG_DFL)
 147         except Exception as e:
 148             logger.exception('arv-mount: exception during exec %s',
 149                              args.exec_args)
 150             try:
 151                 rc = e.errno
 152             except AttributeError:
 153                 pass
 154         finally:
 155             subprocess.call(["fusermount", "-u", "-z", args.mountpoint])
 156
 157         exit(rc)
 158     else:
 159         try:
 160             llfuse.init(operations, args.mountpoint, opts)
 161             llfuse.main()
 162         except Exception as e:
 163             logger.exception('arv-mount: exception during mount')
 164             exit(getattr(e, 'errno', 1))