From 401c53c46917f7e3e8c8fcf1d316f0c274279165 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= Date: Sun, 7 Jul 2013 00:29:50 +0200 Subject: [PATCH] doc: Add a "Boostrapping" section. * doc/guix.texi (Package Modules): New node, with material formerly under "GNU Distribution". (Bootstrapping): New node. * Makefile.am (EXTRA_DIST): Add doc/images/bootstrap-graph.dot and doc/images/bootstrap-graph.eps. (infoimagedir, dist_infoimage_DATA, DOT_OPTIONS): New variable. (.dot.png, .dot.eps, doc/guix.pdf, doc/guix.info, doc/guix.ps): New targets. * doc/images/bootstrap-graph.dot: New file. --- .gitignore | 2 + Makefile.am | 26 ++++- doc/guix.texi | 170 ++++++++++++++++++++++++++++++--- doc/images/bootstrap-graph.dot | 83 ++++++++++++++++ 4 files changed, 265 insertions(+), 16 deletions(-) create mode 100644 doc/images/bootstrap-graph.dot diff --git a/.gitignore b/.gitignore index 9ccddce8c2..f97a3b5f3d 100644 --- a/.gitignore +++ b/.gitignore @@ -74,3 +74,5 @@ stamp-h[0-9] /doc/guix.vr /doc/guix.vrs /nix/scripts/substitute-binary +/doc/images/bootstrap-graph.png +/doc/images/bootstrap-graph.eps diff --git a/Makefile.am b/Makefile.am index 9faa6544ea..ee6d023988 100644 --- a/Makefile.am +++ b/Makefile.am @@ -169,7 +169,31 @@ $(guix_install_go_files): install-nobase_dist_guilemoduleDATA SUBDIRS = po info_TEXINFOS = doc/guix.texi -EXTRA_DIST += doc/fdl-1.3.texi +EXTRA_DIST += \ + doc/fdl-1.3.texi \ + doc/images/bootstrap-graph.dot \ + doc/images/bootstrap-graph.eps + +infoimagedir = $(infodir)/images +dist_infoimage_DATA = doc/images/bootstrap-graph.png + +# Try hard to obtain an image size and aspect that's reasonable for inclusion +# in an Info or PDF document. +DOT_OPTIONS = \ + -Tpng -Gratio=.9 -Gnodesep=.005 -Granksep=.00005 \ + -Nfontsize=9 -Nheight=.1 -Nwidth=.1 + +.dot.png: + dot -Tpng $(DOT_OPTIONS) < "$<" > "$@.tmp" + mv "$@.tmp" "$@" + +.dot.eps: + dot -Teps $(DOT_OPTIONS) < "$<" > "$@.tmp" + mv "$@.tmp" "$@" + +doc/guix.pdf: doc/images/bootstrap-graph.png +doc/guix.info: doc/images/bootstrap-graph.png +doc/guix.ps: doc/images/bootstrap-graph.eps if BUILD_DAEMON diff --git a/doc/guix.texi b/doc/guix.texi index 23e8351c02..4d674b1b20 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -1426,29 +1426,169 @@ guix package}): guix package --list-available @end example -The package definitions of the distribution may are provided by Guile -modules in the @code{(gnu packages ...)} name space---for instance, the -@code{(gnu packages emacs)} module exports a variable named -@code{emacs}, which is bound to a @code{} object -(@pxref{Defining Packages}). The @code{(gnu packages)} module provides -facilities for searching for packages. - -The distribution is fully @dfn{bootstrapped} and @dfn{self-contained}: -each package is built based solely on other packages in the -distribution. The root of this dependency graph is a small set of -@dfn{bootstrap binaries}, provided by the @code{(gnu packages -bootstrap)} module. These are statically-linked binaries of the core -tools without which building anything at all would be impossible. - - Our goal is to build a practical 100% free software distribution of Linux-based and other variants of GNU, with a focus on the promotion and tight integration of GNU components, and an emphasis on programs and tools that help users exert that freedom. +@menu +* Package Modules:: Packages from the programmer's viewpoint. +* Bootstrapping:: GNU/Linux built from scratch. +@end menu + Building this distribution is a cooperative effort, and you are invited to join! @ref{Contributing}, for information about how you can help. +@node Package Modules +@section Package Modules + +From a programming viewpoint, the package definitions of the +distribution are provided by Guile modules in the @code{(gnu packages +...)} name space---for instance, the @code{(gnu packages emacs)} module +exports a variable named @code{emacs}, which is bound to a +@code{} object (@pxref{Defining Packages}). The @code{(gnu +packages)} module provides facilities for searching for packages. + +The distribution is fully @dfn{bootstrapped} and @dfn{self-contained}: +each package is built based solely on other packages in the +distribution. The root of this dependency graph is a small set of +@dfn{bootstrap binaries}, provided by the @code{(gnu packages +bootstrap)} module. More on this in the next section. + + +@node Bootstrapping +@section Bootstrapping + +@c Adapted from the ELS 2013 paper. + +@cindex bootstrapping + +Bootstrapping in our context refers to how the distribution gets built +``from nothing''. Remember that the build environment of a derivation +contains nothing but its declared inputs (@pxref{Introduction}). So +there's an obvious chicken-and-egg problem: how does the first package +get built? How does the first compiler get compiled? Note that this is +a question of interest only to the curious hacker, not to the regular +user, so you can shamelessly skip this section if you consider yourself +a ``regular user''. + +@cindex bootstrap binaries +The GNU system is primarily made of C code, with libc at its core. The +GNU build system itself assumes the availability of a Bourne shell and +command-line tools provided by GNU Coreutils, Awk, Findutils, `sed', and +`grep'. Furthermore, build programs---programs that run +@code{./configure}, @code{make}, etc.---are written in Guile Scheme +(@pxref{Derivations}). Consequently, to be able to build anything at +all, from scratch, Guix relies on pre-built binaries of Guile, GCC, +Binutils, libc, and the other packages mentioned above---the +@dfn{bootstrap binaries}. + +These bootstrap binaries are ``taken for granted'', though we can also +re-create them if needed (more on that later.) + +@unnumberedsubsec Preparing to Use the Bootstrap Binaries + +@c As of Emacs 24.3, Info-mode displays the image, but since it's a +@c large image, it's hard to scroll. Oh well. +@image{images/bootstrap-graph,,,Dependency graph of the early bootstrap derivations} + +The figure above shows the very beginning of the dependency graph of the +distribution, corresponding to the package definitions of the @code{(gnu +packages bootstrap)} module. At this level of detail, things are +slightly complex. First, Guile itself consists of an ELF executable, +along with many source and compiled Scheme files that are dynamically +loaded when it runs. This gets stored in the @file{guile-2.0.7.tar.xz} +tarball shown in this graph. This tarball is part of Guix's ``source'' +distribution, and gets inserted into the store with @code{add-to-store} +(@pxref{The Store}). + +But how do we write a derivation that unpacks this tarball and adds it +to the store? To solve this problem, the @code{guile-bootstrap-2.0.drv} +derivation---the first one that gets built---uses @code{bash} as its +builder, which runs @code{build-bootstrap-guile.sh}, which in turn calls +@code{tar} to unpack the tarball. Thus, @file{bash}, @file{tar}, +@file{xz}, and @file{mkdir} are statically-linked binaries, also part of +the Guix source distribution, whose sole purpose is to allow the Guile +tarball to be unpacked. + +Once @code{guile-bootstrap-2.0.drv} is built, we have a functioning +Guile that can be used to run subsequent build programs. Its first task +is to download tarballs containing the other pre-built binaries---this +is what the @code{.tar.xz.drv} derivations do. Guix modules such as +@code{ftp-client.scm} are used for this purpose. The +@code{module-import.drv} derivations import those modules in a directory +in the store, using the original layout. The +@code{module-import-compiled.drv} derivations compile those modules, and +write them in an output directory with the right layout. This +corresponds to the @code{#:modules} argument of +@code{build-expression->derivation} (@pxref{Derivations}). + +Finally, the various tarballs are unpacked by the +derivations @code{gcc-bootstrap-0.drv}, @code{glibc-bootstrap-0.drv}, +etc., at which point we have a working C tool chain. + + +@unnumberedsubsec Building the Build Tools + +@c TODO: Add a package-level dependency graph generated from (gnu +@c packages base). + +Bootstrapping is complete when we have a full tool chain that does not +depend on the pre-built bootstrap tools discussed above. This +no-dependency requirement is verified by checking whether the files of +the final tool chain contain references to the @file{/nix/store} +directories of the bootstrap inputs. The process that leads to this +``final'' tool chain is described by the package definitions found in +the @code{(gnu packages base)} module. + +@c See . +The first tool that gets built with the bootstrap binaries is +GNU Make, which is a prerequisite for all the following packages. +From there Findutils and Diffutils get built. + +Then come the first-stage Binutils and GCC, built as pseudo cross +tools---i.e., with @code{--target} equal to @code{--host}. They are +used to build libc. Thanks to this cross-build trick, this libc is +guaranteed not to hold any reference to the initial tool chain. + +From there the final Binutils and GCC are built. GCC uses @code{ld} +from the final Binutils, and links programs against the just-built libc. +This tool chain is used to build the other packages used by Guix and by +the GNU Build System: Guile, Bash, Coreutils, etc. + +And voilà! At this point we have the complete set of build tools that +the GNU Build System expects. These are in the @code{%final-inputs} +variables of the @code{(gnu packages base)} module, and are implicitly +used by any package that uses @code{gnu-build-system} (@pxref{Defining +Packages}). + + +@unnumberedsubsec Building the Bootstrap Binaries + +Because the final tool chain does not depend on the bootstrap binaries, +those rarely need to be updated. Nevertheless, it is useful to have an +automated way to produce them, should an update occur, and this is what +the @code{(gnu packages make-bootstrap)} module provides. + +The following command builds the tarballs containing the bootstrap +binaries (Guile, Binutils, GCC, libc, and a tarball containing a mixture +of Coreutils and other basic command-line tools): + +@example +guix build bootstrap-tarballs +@end example + +The generated tarballs are those that should be referred to in the +@code{(gnu packages bootstrap)} module mentioned at the beginning of +this section. + +Still here? Then perhaps by now you've started to wonder: when do we +reach a fixed point? That is an interesting question! The answer is +unknown, but if you would like to investigate further (and have +significant computational and storage resources to do so), then let us +know. + + @c ********************************************************************* @node Contributing @chapter Contributing diff --git a/doc/images/bootstrap-graph.dot b/doc/images/bootstrap-graph.dot new file mode 100644 index 0000000000..06d7f29c7a --- /dev/null +++ b/doc/images/bootstrap-graph.dot @@ -0,0 +1,83 @@ +# Obtained by running "nix-store --graph" on the first GCC derivation. + +digraph G { +"/nix/store/x60397za40lx0n88f51a2csfdq5xvb19-gcc-bootstrap-0.drv" [label = "gcc-bootstrap-0.drv", fontname = Helvetica, shape = box, style = filled, fillcolor = "#ffffff"]; +"/nix/store/3iawic1z95112yfz5y9xdp66qbxxr8l1-tar" -> "/nix/store/x60397za40lx0n88f51a2csfdq5xvb19-gcc-bootstrap-0.drv" [color = "black"]; +"/nix/store/4sv9xhcjap6byca130fzpzzjalb7iixv-glibc-bootstrap-0.drv" -> "/nix/store/x60397za40lx0n88f51a2csfdq5xvb19-gcc-bootstrap-0.drv" [color = "red"]; 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