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doc: Update 'Bootstrapping' for further binary seed reduction. 

* doc/images/gcc-core-mesboot0-graph.dot: New image, replacing
* doc/images/gcc-mesboot0-bag-graph.dot: ... remove file.
* doc/local.mk (DOT_FILES): Update for new image file.
* doc/guix.texi (Reduced Binary Seed Bootstrap): Use it in updated description
of further reduction of the trusted computing base.
master
Jan Nieuwenhuizen 2020-02-18 11:36:37 +01:00
parent d8feee9f18
commit cd5d5f5322
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@ -35,7 +35,7 @@ Copyright @copyright{} 2016, 2017, 2018 Chris Marusich@*
Copyright @copyright{} 2016, 2017, 2018, 2019, 2020 Efraim Flashner@*
Copyright @copyright{} 2016 John Darrington@*
Copyright @copyright{} 2016, 2017 Nikita Gillmann@*
Copyright @copyright{} 2016, 2017, 2018, 2019 Jan Nieuwenhuizen@*
Copyright @copyright{} 2016, 2017, 2018, 2019, 2020 Jan Nieuwenhuizen@*
Copyright @copyright{} 2016 Julien Lepiller@*
Copyright @copyright{} 2016 Alex ter Weele@*
Copyright @copyright{} 2016, 2017, 2018, 2019 Christopher Baines@*
@ -28761,10 +28761,8 @@ 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).
For @code{i686-linux} and @code{x86_64-linux} the Guix bootstrap process is
more elaborate, @pxref{Reduced Binary Seed Bootstrap}.
re-create them if needed (@pxref{Preparing to Use the Bootstrap
Binaries}).
@menu
* Reduced Binary Seed Bootstrap:: A Bootstrap worthy of GNU.
@ -28780,60 +28778,71 @@ Coreutils, Awk, Findutils, `sed', and `grep' and Guile, GCC, Binutils, and the
GNU C Library (@pxref{Bootstrapping}). Usually, these bootstrap binaries are
``taken for granted.''
Taking these binaries for granted means that we consider them to be a correct
and trustworthy `seed' for building the complete system. Therein lies a
problem: the current combined size of these bootstrap binaries is about 250MB
(@pxref{Bootstrappable Builds,,, mes, GNU Mes}). Auditing or even inspecting
these is next to impossible.
Taking the bootstrap binaries for granted means that we consider them to
be a correct and trustworthy ``seed'' for building the complete system.
Therein lies a problem: the combined size of these bootstrap binaries is
about 250MB (@pxref{Bootstrappable Builds,,, mes, GNU Mes}). Auditing
or even inspecting these is next to impossible.
For @code{i686-linux} and @code{x86_64-linux}, Guix now features a ``Reduced
Binary Seed'' bootstrap @footnote{We would like to say: ``Full Source
Bootstrap'' and while we are working towards that goal it would be hyperbole
to use that term for what we do now.}.
For @code{i686-linux} and @code{x86_64-linux}, Guix now features a
``Reduced Binary Seed'' bootstrap @footnote{We would like to say: ``Full
Source Bootstrap'' and while we are working towards that goal it would
be hyperbole to use that term for what we do now.}.
The Reduced Binary Seed bootstrap removes the most critical tools---from a
trust perspective---from the bootstrap binaries: GCC, Binutils and the GNU C
Library are replaced by: @code{bootstrap-mescc-tools} (a tiny assembler and
linker) and @code{bootstrap-mes} (a small Scheme Interpreter and a C compiler
written in Scheme and the Mes C Library, built for TinyCC and for GCC). Using
these new binary seeds and a new set of
@c
packages@footnote{@c
nyacc-boot,
mes-boot,
tcc-boot0,
tcc-boot,
make-mesboot0,
diffutils-mesboot,
binutils-mesboot0,
gcc-core-mesboot,
mesboot-headers,
glibc-mesboot0,
gcc-mesboot0,
binutils-mesboot,
make-mesboot,
gcc-mesboot1,
gcc-mesboot1-wrapper,
glibc-headers-mesboot,
glibc-mesboot,
gcc-mesboot,
and
gcc-mesboot-wrapper.
}
@c
the ``missing'' Binutils, GCC, and the GNU C Library are built from source.
From here on the more traditional bootstrap process resumes. This approach
has reduced the bootstrap binaries in size to about 130MB. Work is ongoing to
reduce this further. If you are interested, join us on @code{#bootstrappable}
on the Freenode IRC network.
written in Scheme and the Mes C Library, built for TinyCC and for GCC).
@c ./pre-inst-env guix graph --type=bag -e '(begin (use-modules (guix packages)) (%current-system "i686-linux") (@@ (gnu packages commencement) gcc-mesboot))' > doc/images/gcc-mesboot-bag-graph.dot
@c dot -T png doc/images/gcc-mesboot-bag-graph.dot > doc/images/gcc-mesboot-bag-graph.png
Using these new binary seeds the ``missing'' Binutils, GCC, and the GNU
C Library are built from source. From here on the more traditional
bootstrap process resumes. This approach has reduced the bootstrap
binaries in size to about 145MB in Guix v1.1.
Below is the generated dependency graph for @code{gcc-mesboot}, the bootstrap
compiler used to build the rest of GuixSD.
The next step that Guix has taken is to replace the shell and all its
utilities with implementations in Guile Scheme, the @emph{Scheme-only
bootstrap}. Gash (@pxref{Gash,,, gash, The Gash manual}) is a
POSIX-compatible shell that replaces Bash, and it comes with Gash Utils
which has minimalist replacements for Awk, the GNU Core Utilities, Grep,
Gzip, Sed, and Tar. The rest of the bootstrap binary seeds that were
removed are now built from source.
@image{images/gcc-mesboot-bag-graph,6in,,Dependency graph of the gcc-mesboot}
Building the GNU System from source is currently only possibly by adding
some historical GNU packages as intermediate steps@footnote{Packages
such as @code{gcc-2.95.3}, @code{binutils-2.14}, @code{glibc-2.2.5},
@code{gzip-1.2.4}, @code{tar-1.22}, and some others. For details, see
@file{gnu/packages/commencement.scm}.}. As Gash and Gash Utils mature,
and GNU packages become more bootstrappable again (e.g., new releases of
GNU Sed will also ship as gzipped tarballs again, as alternative to the
hard to bootstrap @code{xz}-compression), this set of added packages can
hopefully be reduced again.
The graph below shows the resulting dependency graph for
@code{gcc-core-mesboot0}, the bootstrap compiler used for the
traditional bootstrap of the rest of the Guix System.
@c ./pre-inst-env guix graph -e '(@@ (gnu packages commencement) gcc-core-mesboot0)' | sed -re 's,((bootstrap-mescc-tools|bootstrap-mes|guile-bootstrap).*shape =) box,\1 ellipse,' > doc/images/gcc-core-mesboot0-graph.dot
@image{images/gcc-core-mesboot0-graph,6in,,Dependency graph of gcc-core-mesboot0}
The only significant binary bootstrap seeds that remain@footnote{
Ignoring the 68KB @code{mescc-tools}; that will be removed later,
together with @code{mes}.} are a Scheme intepreter and a Scheme
compiler: GNU Mes and GNU Guile@footnote{Not shown in this graph are the
static binaries for @file{bash}, @code{tar}, and @code{xz} that are used
to get Guile running.}.
This further reduction has brought down the size of the binary seed to
about 60MB for @code{i686-linux} and @code{x86_64-linux}.
Work is ongoing to remove all binary blobs from our free software
bootstrap stack, working towards a Full Source Bootstrap. Also ongoing
is work to bring these bootstraps to the @code{arm-linux} and
@code{aarch64-linux} architectures and to the Hurd.
If you are interested, join us on @samp{#bootstrappable} on the Freenode
IRC network or discuss on @email{bug-mes@@gnu.org} or
@email{gash-devel@@nongnu.org}.
@node Preparing to Use the Bootstrap Binaries
@section Preparing to Use the Bootstrap Binaries
@ -28853,7 +28862,7 @@ guix graph -t derivation \
| dot -Tps > gcc.ps
@end example
or, for the Reduced Binary Seed bootstrap
or, for the further Reduced Binary Seed bootstrap
@example
guix graph -t derivation \

114
doc/images/gcc-core-mesboot0-graph.dot 100644
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@ -0,0 +1,114 @@
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"139781034972192" -> "139781131266640" [color = darkseagreen];
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123
doc/images/gcc-mesboot-bag-graph.dot
View File

@ -1,123 +0,0 @@
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"/gnu/store/79zblx3zhbmycl30kvwylpxyhjv52qi4-make-mesboot-3.82.drv" -> "/gnu/store/mrbi3ffh1v62b7sc3g40qvz0i0dbbvbi-make-mesboot0-3.80.drv" [color = magenta];
"/gnu/store/79zblx3zhbmycl30kvwylpxyhjv52qi4-make-mesboot-3.82.drv" -> "/gnu/store/00rjhpbkzk86s4pksjg934l310iaxxjr-bootstrap-binaries-0.drv" [color = magenta];
"/gnu/store/79zblx3zhbmycl30kvwylpxyhjv52qi4-make-mesboot-3.82.drv" -> "/gnu/store/00rjhpbkzk86s4pksjg934l310iaxxjr-bootstrap-binaries-0.drv" [color = magenta];
"/gnu/store/79zblx3zhbmycl30kvwylpxyhjv52qi4-make-mesboot-3.82.drv" -> "/gnu/store/q8d60ln0dxjvqd2ymi1g6xyk3046m23n-linux-libre-headers-bootstrap-0.drv" [color = magenta];
}

2
doc/local.mk
View File

@ -39,7 +39,7 @@ DOT_FILES = \
%D%/images/bootstrap-packages.dot \
%D%/images/coreutils-graph.dot \
%D%/images/coreutils-bag-graph.dot \
%D%/images/gcc-mesboot-bag-graph.dot \
%D%/images/gcc-core-mesboot0-graph.dot \
%D%/images/service-graph.dot \
%D%/images/shepherd-graph.dot