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Line 19: − a) bind-mount the X unix socket into the chroot.+ − b) ssh ''into'' the chroot with X11-forwarding enabled.+ − c) enable TCP on an X server, e.g. a nested Xephyr.+ + + + + + + − We're going to try option (3) first.+ − + + + + + + + + + + + + + + + − There are lots of ways to create appropriate chroots; e.g. by hand, with debootstrap, with mock, etc.+
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Sugar ought to be easy to run from chroots. For a variety of silly reasons, this isn't yet the case, but it might be soon. Ping [[User:Mstone|Michael]] with questions.
Sugar ought to be easy to run from chroots. For a variety of silly reasons, this isn't yet the case, but it might be soon. Ping [[User:Mstone|Michael]] with questions.
=== Chroot Construction ===
There are lots of ways to create appropriate chroots; e.g. by hand, with debootstrap, with mock, etc.
With debootstrap, you want something like
debootstrap --arch i386 sid sid-root http://debian.lcs.mit.edu/debian
sudo chroot sid-root /bin/bash -l
With mock, it would be more like
mock -r fedora-devel-i386 --init
mock -r fedora-devel-i386 --shell
=== X11 ===
=== X11 ===
Most X11 servers are configured to disable TCP connections. This means that in order to get a working X connection we can:
Most X11 servers are configured to disable TCP connections. This means that in order to get a working X connection we can:
# bind-mount the X unix socket into the chroot.
# ssh ''into'' the chroot with X11-forwarding enabled.
# enable TCP on an X server, e.g. a nested Xephyr.
We're going to try option (3) first:
Xephyr -ac :1
and, inside the chroot:
export DISPLAY=localhost:1
=== Chroot Construction ===
::''NB: If you figure out how to make Xephyr bind only to localhost sockets (or how to make it use a custom xauth config), speak up!''
=== D-Bus ===
Sugar wants to be able to use global state stored in both HAL and NetworkManager, both of which live on the system bus. Consequently, we need to bind-mount
mount --bind /var/run/dbus $CHROOT/var/run/dbus
before entering the chroot. (Mock uses unshare() to enter a new mount-point namespace since this makes garbage collection of mountpoints much easier.)
With debootstrap, you'll also need to run some of
mount -t proc proc $CHROOT/proc
mount -t devpts devpts $CHROOT/dev/pts
mount -t selinuxfs selinux $CHROOT/selinux
manually in order to get a working chroot.