X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fbup%2Fssh.py;h=de0448d003467f248572311b81b861e6d3560e46;hb=3eb23e4243379195f0e5cfff932ad3ec949b4f98;hp=cefa54385307ed290dd55c856c5fb6d50dcf90e0;hpb=dc79ae76c38e581164e0577c2c7b7bae2f0b37a7;p=bup.git

diff --git a/lib/bup/ssh.py b/lib/bup/ssh.py
index cefa543..de0448d 100644
--- a/lib/bup/ssh.py
+++ b/lib/bup/ssh.py
@@ -1,15 +1,21 @@
-import os, re, subprocess
-from bup import helpers
+"""SSH connection.
+Connect to a remote host via SSH and execute a command on the host.
+"""
 
-def connect(rhost, subcmd):
-    assert(not re.search(r'[^\w-]', subcmd))
-    main_exe = os.environ.get('BUP_MAIN_EXE') or sys.argv[0]
-    nicedir = os.path.split(os.path.abspath(main_exe))[0]
-    nicedir = re.sub(r':', "_", nicedir)
-    if rhost == '-':
+from __future__ import absolute_import, print_function
+import sys, os, re, subprocess
+
+from bup import helpers, path
+from bup.compat import environ
+
+def connect(rhost, port, subcmd, stderr=None):
+    """Connect to 'rhost' and execute the bup subcommand 'subcmd' on it."""
+    assert not re.search(br'[^\w-]', subcmd)
+    nicedir = re.sub(b':', b'_', path.exedir())
+    if rhost == b'-':
         rhost = None
     if not rhost:
-        argv = ['bup', subcmd]
+        argv = [b'bup', subcmd]
     else:
         # WARNING: shell quoting security holes are possible here, so we
         # have to be super careful.  We have to use 'sh -c' because
@@ -18,18 +24,32 @@ def connect(rhost, subcmd):
         # 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)
-        force_tty = helpers.atoi(os.environ.get('BUP_FORCE_TTY'))
-        cmd = r"""
-                   sh -c PATH=%s:'$PATH BUP_FORCE_TTY=%s bup %s'
-               """ % (escapedir, force_tty, subcmd)
-        argv = ['ssh', rhost, '--', cmd.strip()]
+        escapedir = re.sub(br'([^\w/])', br'\\\\\\\1', nicedir)
+        buglvl = helpers.atoi(environ.get(b'BUP_DEBUG'))
+        force_tty = helpers.atoi(environ.get(b'BUP_FORCE_TTY'))
+        cmd = b"""
+                   sh -c PATH=%s:'$PATH BUP_DEBUG=%s BUP_FORCE_TTY=%s bup %s'
+               """ % (escapedir, buglvl, force_tty, subcmd)
+        argv = [b'ssh']
+        if port:
+            argv.extend((b'-p', port))
+        argv.extend((rhost, b'--', cmd.strip()))
         #helpers.log('argv is: %r\n' % argv)
-    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)
+    if rhost:
+        env = environ
+    else:
+        envpath = environ.get(b'PATH')
+        env = environ.copy()
+        env[b'PATH'] = nicedir if not envpath else nicedir + b':' + envpath
+    if sys.version_info[0] < 3:
+        return subprocess.Popen(argv,
+                                stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                                stderr=stderr,
+                                env=env,
+                                preexec_fn=lambda: os.setsid())
+    else:
+        return subprocess.Popen(argv,
+                                stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                                stderr=stderr,
+                                env=env,
+                                start_new_session=True)