* Updated the quick start section. Use channels instead of
downloading Nix expressions and calling nix-pull. This is so user-friendly that even a Mac user can do it! :-)
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Eelco Dolstra
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<chapter>
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<title>Quick Start</title>
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<chapter><title>Quick Start</title>
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<para>
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This chapter is for impatient people who don't like reading
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documentation. For more in-depth information you are kindly
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referred to <xref linkend='chap-installation' /> and <xref
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linkend='chap-overview' />.
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</para>
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<para>This chapter is for impatient people who don't like reading
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documentation. For more in-depth information you are kindly referred
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to <xref linkend='chap-installation' /> and <xref
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linkend='chap-overview' />.</para>
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<orderedlist>
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<orderedlist>
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<listitem>
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<para>
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Download a source tarball or RPM from <ulink
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url='http://www.cs.uu.nl/groups/ST/Trace/Nix'/>.
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Build source distributions using the regular sequence:
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<listitem><para>Download a source tarball or RPM from <ulink
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url='http://www.cs.uu.nl/groups/ST/Trace/Nix'/>. Build source
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distributions using the regular sequence:
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<screen>
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<screen>
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$ tar xvfj nix-<replaceable>version</replaceable>.tar.bz2
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$ ./configure
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$ make
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$ make install <lineannotation>(as root)</lineannotation></screen>
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This will install Nix in <filename>/nix</filename>. You
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should also add <filename>/nix/etc/profile.d/nix.sh</filename>
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to your <filename>~/.bashrc</filename> (or some other login
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file).
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</para>
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</listitem>
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This will install Nix in <filename>/nix</filename>. You shouldn't
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change the prefix if at all possible since that will make it
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impossible to use our pre-built components. Alternatively, you could
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grab an RPM if you're on an RPM-based system. You should also add
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<filename>/nix/etc/profile.d/nix.sh</filename> to your
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<filename>~/.bashrc</filename> (or some other login
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file).</para></listitem>
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<listitem>
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<para>
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Get some Nix expressions for pre-built packages by downloading
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the latest <literal>nixpkgs</literal> distribution (from the
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same location), and unpack them.
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<listitem><para>Subscribe to the Nix Packages channel.
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<screen>
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$ wget http://<replaceable>...</replaceable>/nix/nixpkgs-<replaceable>version</replaceable>/nixpkgs-<replaceable>version</replaceable>.tar.bz2
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$ tar xfj nixpkgs-<replaceable>version</replaceable>.tar.bz2</screen>
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<screen>
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$ nix-channel --add http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable</screen>
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This will unpack the distribution into a directory
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<filename>nixpkgs-<replaceable>version</replaceable>/</filename>.
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</para>
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</listitem>
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</para></listitem>
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<listitem>
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<para>
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Pull the Nix cache. This ensures that when you install
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packages they are downloaded in pre-built form from the
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network, rather than built from source.
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<listitem><para>Download the latest Nix expressions available in the channel.
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<screen>
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$ nix-channel --update</screen>
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<screen>
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$ nix-pull http://<replaceable>...</replaceable>/nix/nixpkgs-<replaceable>version</replaceable>/MANIFEST</screen>
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Note that this in itself doesn't download any components, it just
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downloads the Nix expressions that build them and stores them
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somewhere (under <filename>~/.nix-defexpr</filename>, in case you're
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curious). Also, it registers the fact that pre-built binaries are
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available remotely.</para></listitem>
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</para>
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<listitem><para>See what installable components are currently
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available in the channel:
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<para>
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Note that currently we only pre-build for Linux on x86
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platforms.
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</para>
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</listitem>
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<listitem>
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<para>
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See what's available:
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<screen>
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$ nix-env -qaf nixpkgs-<replaceable>version</replaceable>/
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MozillaFirebird-0.7
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hello-2.1.1
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<screen>
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$ nix-env -qa
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docbook-xml-4.2
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firefox-1.0pre-PR-0.10.1
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hello-2.1.1
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libxslt-1.1.0
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<replaceable>...</replaceable></screen>
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</para>
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</listitem>
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</para></listitem>
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<listitem>
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<para>
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Install some packages:
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<listitem><para>Install some components from the channel:
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<screen>
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$ nix-env -iBf nixpkgs-<replaceable>version</replaceable>/ hello MozillaFirebird <replaceable>...</replaceable> </screen>
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<screen>
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$ nix-env -i hello firefox <replaceable>...</replaceable> </screen>
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</para>
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</listitem>
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This should download the pre-built components; it should not build
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them locally (if it does, something went wrong).</para></listitem>
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<listitem>
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<para>
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Test that they work:
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<listitem><para>Test that they work:
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<screen>
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<screen>
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$ which hello
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/home/eelco/.nix-profile/bin/hello
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$ hello
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Hello, world!
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$ MozillaFirebird
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$ firefox
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<lineannotation>(read Slashdot or something)</lineannotation></screen>
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</para>
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</listitem>
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</para></listitem>
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<listitem>
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<para>
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Uninstall a package:
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<listitem><para>Uninstall a package:
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<screen>
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<screen>
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$ nix-env -e hello</screen>
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</para>
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</listitem>
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</para></listitem>
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<listitem>
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<para>
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If a new release of <literal>nixpkgs</literal> comes along,
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you can upgrade all installed packages to the latest versions
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by downloading and unpacking the new release and doing:
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<listitem><para>To keep up-to-date with the channel, do:
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<screen>
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$ nix-env -uBf nixpkgs-<replaceable>version</replaceable>/ '*'</screen>
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<screen>
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$ nix-channel --update
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$ nix-env -u '*'</screen>
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</para>
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</listitem>
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The latter command will upgrade each installed component for which
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there is a <quote>newer</quote> version (as determined by comparing
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the version numbers).</para></listitem>
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<listitem>
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<para>
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You should periodically run the Nix garbage collector to get
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rid of unused packages, since uninstalls or upgrades don't
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actual delete them:
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<listitem><para>If you're unhappy with the result of a
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<command>nix-env</command> action (e.g., an upgraded component turned
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out not to work properly), you can go back:
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<screen>
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<screen>
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$ nix-env --rollback</screen>
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</para></listitem>
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<listitem><para>You should periodically run the Nix garbage collector
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to get rid of unused packages, since uninstalls or upgrades don't
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actual delete them:
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<screen>
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$ nix-env --delete-generations old
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$ nix-collect-garbage</screen>
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</para>
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</listitem>
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The first command deletes old <quote>generations</quote> of your
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profile (making rollbacks impossible, but also making the components
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in those old generations available for garbage collection), while the
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second command actually deletes them.</para></listitem>
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</orderedlist>
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</orderedlist>
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</chapter>
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