3 bup_python="$(dirname "$0")/bup-python" || exit $?
4 exec "$bup_python" "$0" ${1+"$@"}
8 from __future__ import absolute_import
11 from bup import options, helpers, path
17 This command is run automatically by 'bup on'
19 o = options.Options(optspec)
20 (opt, flags, extra) = o.parse(sys.argv[1:])
22 o.fatal('no arguments expected')
24 # get the subcommand's argv.
25 # Normally we could just pass this on the command line, but since we'll often
26 # be getting called on the other end of an ssh pipe, which tends to mangle
27 # argv (by sending it via the shell), this way is much safer.
28 buf = sys.stdin.read(4)
29 sz = struct.unpack('!I', buf)[0]
32 buf = sys.stdin.read(sz)
33 assert(len(buf) == sz)
34 argv = buf.split('\0')
36 argv = [argv[0], 'mux', '--'] + argv
38 # stdin/stdout are supposedly connected to 'bup server' that the caller
39 # started for us (often on the other end of an ssh tunnel), so we don't want
40 # to misuse them. Move them out of the way, then replace stdout with
41 # a pointer to stderr in case our subcommand wants to do something with it.
43 # It might be nice to do the same with stdin, but my experiments showed that
44 # ssh seems to make its child's stderr a readable-but-never-reads-anything
45 # socket. They really should have used shutdown(SHUT_WR) on the other end
46 # of it, but probably didn't. Anyway, it's too messy, so let's just make sure
47 # anyone reading from stdin is disappointed.
49 # (You can't just leave stdin/stdout "not open" by closing the file
50 # descriptors. Then the next file that opens is automatically assigned 0 or 1,
51 # and people *trying* to read/write stdin/stdout get screwed.)
55 fd = os.open('/dev/null', os.O_RDONLY)
59 os.environ['BUP_SERVER_REVERSE'] = helpers.hostname()
60 os.execvp(argv[0], argv)