Initial commit.

Importing options.py, ssh.py, and LICENSE from the bup project.

.gitignore

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+*.pyc
+*~

main.py

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+#!/usr/bin/env python
+import ssh, options

options.py

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+import sys, textwrap, getopt, re
+
+class OptDict:
+    def __init__(self):
+        self._opts = {}
+
+    def __setitem__(self, k, v):
+        self._opts[k] = v
+
+    def __getitem__(self, k):
+        return self._opts[k]
+
+    def __getattr__(self, k):
+        return self[k]
+
+
+class Options:
+    def __init__(self, exe, optspec, optfunc=getopt.gnu_getopt):
+        self.exe = exe
+        self.optspec = optspec
+        self.optfunc = optfunc
+        self._aliases = {}
+        self._shortopts = 'h?'
+        self._longopts = ['help']
+        self._hasparms = {}
+        self._usagestr = self._gen_usage()
+
+    def _gen_usage(self):
+        out = []
+        lines = self.optspec.strip().split('\n')
+        lines.reverse()
+        first_syn = True
+        while lines:
+            l = lines.pop()
+            if l == '--': break
+            out.append('%s: %s\n' % (first_syn and 'usage' or '   or', l))
+            first_syn = False
+        out.append('\n')
+        while lines:
+            l = lines.pop()
+            if l.startswith(' '):
+                out.append('\n%s\n' % l.lstrip())
+            elif l:
+                (flags, extra) = l.split(' ', 1)
+                extra = extra.strip()
+                if flags.endswith('='):
+                    flags = flags[:-1]
+                    has_parm = 1
+                else:
+                    has_parm = 0
+                flagl = flags.split(',')
+                flagl_nice = []
+                for f in flagl:
+                    f_nice = re.sub(r'\W', '_', f)
+                    self._aliases[f] = flagl[0]
+                    self._aliases[f_nice] = flagl[0]
+                    self._hasparms[f] = has_parm
+                    if len(f) == 1:
+                        self._shortopts += f + (has_parm and ':' or '')
+                        flagl_nice.append('-' + f)
+                    else:
+                        assert(not f.startswith('no-')) # supported implicitly
+                        self._longopts.append(f + (has_parm and '=' or ''))
+                        self._longopts.append('no-' + f)
+                        flagl_nice.append('--' + f)
+                flags_nice = ', '.join(flagl_nice)
+                if has_parm:
+                    flags_nice += ' ...'
+                prefix = '    %-20s  ' % flags_nice
+                argtext = '\n'.join(textwrap.wrap(extra, width=70,
+                                                initial_indent=prefix,
+                                                subsequent_indent=' '*28))
+                out.append(argtext + '\n')
+            else:
+                out.append('\n')
+        return ''.join(out).rstrip() + '\n'
+
+    def usage(self):
+        sys.stderr.write(self._usagestr)
+        sys.exit(97)
+
+    def fatal(self, s):
+        sys.stderr.write('error: %s\n' % s)
+        return self.usage()
+
+    def parse(self, args):
+        try:
+            (flags,extra) = self.optfunc(args, self._shortopts, self._longopts)
+        except getopt.GetoptError, e:
+            self.fatal(e)
+
+        opt = OptDict()
+        for f in self._aliases.values():
+            opt[f] = None
+        for (k,v) in flags:
+            while k.startswith('-'):
+                k = k[1:]
+            if k in ['h', '?', 'help']:
+                self.usage()
+            if k.startswith('no-'):
+                k = self._aliases[k[3:]]
+                opt[k] = None
+            else:
+                k = self._aliases[k]
+                if not self._hasparms[k]:
+                    assert(v == '')
+                    opt[k] = (opt._opts.get(k) or 0) + 1
+                else:
+                    try:
+                        vv = int(v)
+                        if str(vv) == v:
+                            v = vv
+                    except ValueError:
+                        pass
+                    opt[k] = v
+        for (f1,f2) in self._aliases.items():
+            opt[f1] = opt[f2]
+        return (opt,flags,extra)

ssh.py

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+import os, re, subprocess
+
+def connect(rhost, subcmd):
+    assert(not re.search(r'[^\w-]', subcmd))
+    main_exe = sys.argv[0]
+    nicedir = os.path.split(os.path.abspath(main_exe))[0]
+    nicedir = re.sub(r':', "_", nicedir)
+    if rhost == '-':
+        rhost = None
+    if not rhost:
+        argv = ['sshuttle', subcmd]
+    else:
+        # WARNING: shell quoting security holes are possible here, so we
+        # have to be super careful.  We have to use 'sh -c' because
+        # csh-derived shells can't handle PATH= notation.  We can't
+        # set PATH in advance, because ssh probably replaces it.  We
+        # can't exec *safely* using argv, because *both* ssh and 'sh -c'
+        # allow shellquoting.  So we end up having to double-shellquote
+        # stuff here.
+        escapedir = re.sub(r'([^\w/])', r'\\\\\\\1', nicedir)
+        cmd = r"""
+                   sh -c PATH=%s:'$PATH sshuttle %s'
+               """ % (escapedir, subcmd)
+        argv = ['ssh', rhost, '--', cmd.strip()]
+    def setup():
+        # runs in the child process
+        if not rhost:
+            os.environ['PATH'] = ':'.join([nicedir,
+                                           os.environ.get('PATH', '')])
+        os.setsid()
+    return subprocess.Popen(argv, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                            preexec_fn=setup)

sshuttle

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+main.py