fishdescriptor: Make Donor.pid a public member

[chiark-utils.git] / fishdescriptor / py / fishdescriptor / fish.py

diff --git a/fishdescriptor/py/fishdescriptor/fish.py b/fishdescriptor/py/fishdescriptor/fish.py
index 95694ff2eaceac3eb59c1b0d672eadf9405c0885..15ad7660faa3e19861a8d08cb2dde2106348cdf2 100644 (file)
--- a/fishdescriptor/py/fishdescriptor/fish.py
+++ b/fishdescriptor/py/fishdescriptor/fish.py
@@ -4,31 +4,32 @@ import socket
 import subprocess
 import os
 import pwd
+import struct
 
 def _shuffle_fd3():
-    os.dup(1,3)
-    os.dup(2,1)
+    os.dup2(1,3)
+    os.dup2(2,1)
 
 class Donor():
     def __init__(d, pid):
-        d._pid = pid
+        d.pid = pid
         d._sp = subprocess.Popen(
-            preexec_fn = _suffle_fd3,
+            preexec_fn = _shuffle_fd3,
             stdin = subprocess.PIPE,
             stdout = subprocess.PIPE,
             close_fds = False,
-            args = ['gdb', '-p', pid, '-batch', '-ex'
+            args = ['gdb', '-p', str(pid), '-batch', '-ex',
                     'python import fishdescriptor.indonor as id;'+
                     ' id.DonorImplementation().eval_loop()'
                 ]
         )            
 
     def _eval_integer(d, expr):
-        l = d._sp.stdin.readline()
-        if l != '!\n': raise RuntimeError("indonor said %s" % repr(l))
-        d._sp.stdout.write(expr + '\n')
-        d._sp.stdout.flush()
-        l = d._sp.stdin.readline().rstrip('\n')
+        l = d._sp.stdout.readline()
+        if l != b'!\n': raise RuntimeError("indonor said %s" % repr(l))
+        d._sp.stdin.write(expr.encode('utf-8') + b'\n')
+        d._sp.stdin.flush()
+        l = d._sp.stdout.readline().rstrip(b'\n')
         return int(l)
 
     def _eval_success(d, expr):
@@ -50,14 +51,14 @@ class Donor():
         ap = subprocess.Popen(
             stdin = subprocess.DEVNULL,
             stdout = subprocess.PIPE,
-            args = ['perl','-we',perl_script] + fds
+            args = ['perl','-we',perl_script] + [str(x) for x in fds]
         )
         (output, dummy) = ap.communicate()
-        return output
+        return output.decode('utf-8')
 
     def donate(d, path, fds):
         ancil = d._ancilmsg(fds)
-        d._eval_success('di.donate(%s, %s)'
+        d._eval_success('di.donate(%s, [ %s ])'
                         % (repr(path), ancil))
         return len(ancil.split(','))
 
@@ -76,11 +77,11 @@ class Donor():
     def _sock_dir(d, target_euid):
         run_dir = '/run/user/%d' % target_euid
         if d._exists(run_dir):
-            return run_dir + 'fishdescriptor'
+            return run_dir + '/fishdescriptor'
 
         try:
             pw = pwd.getpwuid(target_euid)
-            return pw.pw_dir + '.fishdescriptor'
+            return pw.pw_dir + '/.fishdescriptor'
         except KeyError:
             pass
 
@@ -96,9 +97,9 @@ class Donor():
         sockdir = d._sock_dir(euid)
         d.mkdir(sockdir)
 
-        sockname = '%s/%s,%d' % (sockdir, os.uname().nodename, d._pid)
+        sockname = '%s/%s,%d' % (sockdir, os.uname().nodename, d.pid)
 
-        target_root = '/proc/%d/root/' % d._pid
+        target_root = '/proc/%d/root' % d.pid
         if not d._exists(target_root):
             target_root = ''
 
@@ -116,14 +117,16 @@ class Donor():
             s.listen(1)
 
             ancil_len = d.donate(our_sockname, fds)
-            s2 = s.accept()
+            (s2, dummy) = s.accept()
             (msg, ancil, flags, sender) = s2.recvmsg(1, ancil_len)
 
-            got_fds = [ ]
+            got_fds = None
+            unpack_fmt = '%di' % len(fds)
 
             for clvl, ctype, cdata in ancil:
                 if clvl == socket.SOL_SOCKET and ctype == socket.SCM_RIGHTS:
-                    got_fds += cdata # need to trim any surplus, and unpack
+                    assert(got_fds is None)
+                    got_fds = struct.unpack_from(unpack_fmt, cdata)
 
         finally:
             if s is not None: s.close()
@@ -131,3 +134,8 @@ class Donor():
 
             try: os.remove(our_sockname)
             except FileNotFoundError: pass
+
+        return list(got_fds)
+
+    def detach(d):
+        d._sp.stdin.close()