Bug#463866: Missing ptys in lenny /target/

[Petter Reinholdtsen <pere@hungry.com>]

[Frans Pop]
> Please propose a patch.

I suspect something like this should work.  Not sure if the test
[ ! -e /target/dev/pts/0 ] is the best way to detect if devpts is
missing, but it is a start.

Index: chroot-setup.sh
===================================================================
--- chroot-setup.sh     (revision 51179)
+++ chroot-setup.sh     (working copy)
@@ -59,6 +59,13 @@
                mount -t sysfs sysfs /target/sys
        fi

+       # In Lenny, /dev/ lack the pty devices, so the kernel fs
+       # devpts need to be mounted (see #463866).
+       if [ ! -e /target/dev/pts/0 ] ; then
+               mkdir -p /target/dev/pts
+               mount -t devpts devpts -o noexec,nosuid,gid=5,mode=620 /target/dev/pts
+       fi
+
        # Try to enable proxy when using HTTP.
        # What about using ftp_proxy for FTP sources?
        RET=$(debconf-get mirror/protocol || true)