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-Setting up and running Nix UML ("nixu")
-
-It is possible to run Nix inside a User Mode Linux environment (UML). The Nix
-expressions for this can be found at
-https://svn.cs.uu.nl:12443/repos/trace/nixu/.
-
-
-  Installation on SuSE Linux 9
-
-Download the latest nixpkgs collection and checkout the nixu trunk with
-subversion. Install the uml and uml-utilities packages with Nix and run the
-"make-disk.sh" script which can be found in nixu. After it has built
-everything (or downloaded everything from the nixpkgs cache which can be
-used with nix-pull) you can use the "run.sh" script to start the UML.
-
-
-  Installation on Fedora Core 1
-
-Installing the Nix UML on Fedora Core 1 is a bit tricky. Nix relies on
-Berkeley DB and there are issues with Berkeley DB and NPTL kernels (New POSIX
-Thread Library) on Red Hat based systems. Since the system we build inside
-UML does not use NPTL we cannot use the Nix we use on the host system to
-fill the disk once we've booted our the kernel of our UML.
-
-The solution is as follows:
-
-- install all packages via the nix-pull mechanisms with the MANIFEST from
-  the official nix-pkgs site to avoid that impure builds link against the
-  NPTL glibc on the host system.
-- install Nix in Nix
-- in the nixu scripts edit make-disk.sh and fill-disk.sh.
-  In make-disk.sh prefix all nix-* commands with the absolute path to the
-  host-Nix installation bin directory (for example: /nix/bin). In
-  fill-disk.sh replace all /nix/bin paths with a relative path to the Nix
-  installed with Nix (for example: /usr/home/nix/.nix-profile/bin).
-
-This should fix the installation problems and the Nix UML should boot
-flawlessly.
-
-
-  Nix UML and 2.6 kernel
-
-Installing the current Nix UML packages with a 2.4 kernel on a 2.6
-kernel based host system will most likely fail. Linux kernel 2.6 uses NPTL
-by default, but UML itself seems to be broken somewhat so halfway the system
-seems to hang.
-
-Installing a 2.6 based UML with Nix is not trivial and is not advised.
-
-
-  Using the Nix UML
-
-By default, the Nix UML comes with very little configuration. Apart from the
-networking information and mount information, there is nothing. One of the
-first things to do is to add user and group information, otherwise a lot
-of tools won't work. There are empty passwd, shadow and group files. Due
-to some limitations in Nix it is only possible to modify the password file
-as root.
-
-- add a root user:
-
-useradd root
-
-- edit /etc/passwd and change the UID to 0 ("vim" is provided)
-- add a root group:
-
-groupadd root
-
-
-  Adding packages to the UML Nix installation
-
-Packages can be added the the Nix UML installation by editing a few files.
-The first file packages should be added to is 'pkgs.nix'. The other files
-that should be edited all reside in the "boot" directory. In default.nix
-the packages should be added as an argument (first line) and given as an
-argument to the builder (line starting with "inherit"). In "builder.sh"
-there is a sed expression which subsitutes all occurences of the names of
-the packages in the files with the right value. If the programs that are
-added need to be added to $PATH the file "env.sh" has to be edited and the
-UML has to be recreated.
-
-Another option would be to enable networking in the UML and use nix-pull to
-get all the right packages, however this does not work yet out of the box.
-A small trick is to symlink /bin/sh to the current version of "sh":
-
-# cd /bin
-# ln -s `which sh` sh
-
-We're looking for a more permanent solution to fix this.