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Line 1: − 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.+ − ==== debootstrap ====+ − With debootstrap, in order to get a working chroot, you want something like: − export CHROOT=`pwd`/sid-root+ − sudo debootstrap --arch i386 sid $CHROOT http://debian.lcs.mit.edu/debian − sudo chroot $CHROOT /bin/bash -l − # and some of the following: − mount -t proc proc $CHROOT/proc − mount -t devpts devpts $CHROOT/dev/pts − mount -t selinuxfs selinux $CHROOT/selinux − + − ==== mock ====+ − With mock, it would be more like: − mock -r fedora-devel-i386 --init+ − mock -r fedora-devel-i386 --shell+ + − === X11 ===+ − Most X11 servers are configured to disable TCP connections. This means that in order to get a working X connection we can:+ + − # bind-mount the X unix socket into the chroot.+ − # ssh ''into'' the chroot with X11-forwarding enabled. − # Enable TCP on an X server, e.g. a nested Xephyr. − We're going to try option (3) first:+ + − # ''outside chroot''+ − DISP=:1 # adjust to suit your configuration − COOKIE=$(mcookie) − AUTH=$(mktemp) − echo "add $DISP . $COOKIE" | xauth -f "$AUTH" − echo "add these commands to clients:" − echo "export DISPLAY=\"localhost$DISP\"" − echo "export XAUTHORITY=\"$AUTH\"" − Xephyr -auth "$AUTH" -reset -terminate "$DISP" && rm "$AUTH" − And, ''inside'' the chroot, set the <tt>DISPLAY</tt> and <tt>XAUTHORITY</tt> variables as directed by the setup script and copy the <tt>"$AUTH"</tt> file from outside the chroot into the chroot to the path assigned to <tt>"$XAUTHORITY"</tt>.+ − === 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 $CHROOT/var/run/dbus+ − − before entering the chroot. (Mock uses unshare() to enter a new mount-point namespace since this makes garbage collection of mountpoints much easier.) − − − − For stupid reasons, it's necessary that Sugar run under a uid inside the chroot which exists as a real account outside the chroot. (Talk to the DBus people.) − − Consequently, run something like this ''both'' inside and outside the chroot: − − groupadd -g 64002 sugar − useradd -m -u 64002 -g sugar sugar − − Then, inside the chroot, you can happily run sugar as user 'sugar' with something like − − cat > as_person <<EOF − #!/usr/bin/env python − from os import environ, chdir, setgroups, setgid, setuid, execve − from sys import argv − from pwd import getpwnam − user = getpwnam(argv[1]) − environ['HOME'] = user.pw_dir − environ['USER'] = user.pw_name − chdir(user.pw_dir) − setgroups([user.pw_gid]) − setgid(user.pw_gid) − setuid(user.pw_uid) − execve(argv[2], argv[2:], environ) − EOF − chmod a+x as_person − ./as_person sugar /usr/bin/sugar − − − == Jhbuild == − − After, you can also build sugar inside your chroot without compromising your ''main'' system. − − *[[Development Team/Jhbuild]]
Development Team/Chroot (view source)
Revision as of 21:33, 23 February 2010
, 21:33, 23 February 2010moved Walter is a wanker 12/Chroot to Development Team/Chroot over redirect: revert
=== Status ===
* sugar-chroot-0.1 released: see [http://dev.laptop.org/git/users/mstone/sugar-chroot sugar-chroot]
=== Purpose ===
''You want to hack sugar. You don't want to fuss around. '''You want sugar-chroot.'''''
=== Usage ===
''Reference: http://www.debian.org/doc/manuals/reference/ch-tips.en.html ''
As excerpted from the '''[http://dev.laptop.org/git/users/mstone/sugar-chroot/plain/README README]''':
sugar-chroot consists of simple scripts. Download and unpack them like so:
NV=sugar-chroot-0.1
curl http://dev.laptop.org/~mstone/releases/SOURCES/$NV.tar.xz | tar Zxf $NV.tar.xz
cd $NV
To use them, pick a supported distro:
DISTRO=debian
DISTRO=fedora
To configure:
echo $DISTRO > conf/distro
$EDITOR conf/$DISTRO.mk
Then run
sudo make r/distro
to install your chroot.
=== History ===
See http://wiki.sugarlabs.org/index.php?title=Development_Team/Chroot&oldid=36911 for the manual instructions which sugar-chroot automates.
=== User Account ===