* Run smbd in its own session / process group (setsid) because smbd

now kills its process group when it exits.  Without setsid, this
  ends up killing the parent (i.e., the builder).
* Use port 445 instead of 139 because the CIFS kernel module tries
  port 445 first.  If there is an actual Samba running on the host, it
  would end up connecting to that one instead of our own and fail.

svn path=/nixpkgs/trunk/; revision=25017

pkgs/build-support/vm/default.nix

@@ -216,7 +216,7 @@ rec {
       -nographic -no-reboot \
       -net nic,model=virtio \
       -chardev socket,id=samba,path=./samba \
-      -net user,guestfwd=tcp:10.0.2.4:139-chardev:samba \
+      -net user,guestfwd=tcp:10.0.2.4:445-chardev:samba \
       -drive file=$diskImage,if=virtio,boot=on,cache=writeback,werror=report \
       -kernel ${kernel}/bzImage \
       -initrd ${initrd}/initrd \
@@ -247,7 +247,7 @@ rec {
       SMB
 
       rm -f ./samba
-      ${socat}/bin/socat unix-listen:./samba exec:"${samba}/sbin/smbd -s $TMPDIR/smb.conf",nofork > /dev/null 2>&1 &
+      ${socat}/bin/socat unix-listen:./samba exec:"${utillinux}/bin/setsid ${samba}/sbin/smbd -s $TMPDIR/smb.conf",nofork > /dev/null 2>&1 &
       while [ ! -e ./samba ]; do sleep 0.1; done # ugly
     '';