3 # https://sourceware.org/bugzilla/show_bug.cgi?id=26034
4 export "BUP_ARGV_0"="$0"
7 export "BUP_ARGV_${arg_i}"="$arg"
11 # Here to end of preamble replaced during install
12 bup_python="$(dirname "$0")/bup-python" || exit $?
13 exec "$bup_python" "$0"
17 from __future__ import absolute_import
18 import sys, os, struct
20 from bup import compat, options, helpers, path
21 from bup.compat import environ, py_maj
22 from bup.io import byte_stream
27 This command is run automatically by 'bup on'
29 o = options.Options(optspec)
30 opt, flags, extra = o.parse(compat.argv[1:])
32 o.fatal('no arguments expected')
34 # get the subcommand's argv.
35 # Normally we could just pass this on the command line, but since we'll often
36 # be getting called on the other end of an ssh pipe, which tends to mangle
37 # argv (by sending it via the shell), this way is much safer.
39 stdin = byte_stream(sys.stdin)
41 sz = struct.unpack('!I', buf)[0]
45 assert(len(buf) == sz)
46 argv = buf.split(b'\0')
48 argv = [argv[0], b'mux', b'--'] + argv
51 # stdin/stdout are supposedly connected to 'bup server' that the caller
52 # started for us (often on the other end of an ssh tunnel), so we don't want
53 # to misuse them. Move them out of the way, then replace stdout with
54 # a pointer to stderr in case our subcommand wants to do something with it.
56 # It might be nice to do the same with stdin, but my experiments showed that
57 # ssh seems to make its child's stderr a readable-but-never-reads-anything
58 # socket. They really should have used shutdown(SHUT_WR) on the other end
59 # of it, but probably didn't. Anyway, it's too messy, so let's just make sure
60 # anyone reading from stdin is disappointed.
62 # (You can't just leave stdin/stdout "not open" by closing the file
63 # descriptors. Then the next file that opens is automatically assigned 0 or 1,
64 # and people *trying* to read/write stdin/stdout get screwed.)
68 fd = os.open(os.devnull, os.O_RDONLY)
72 environ[b'BUP_SERVER_REVERSE'] = helpers.hostname()
73 os.execvp(argv[0], argv)