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branch master updated: website: Add draft post about the further-reduced
|
From: |
Jan Nieuwenhuizen |
|
Subject: |
branch master updated: website: Add draft post about the further-reduced binary bootstrap. |
|
Date: |
Fri, 12 Jun 2020 07:03:16 -0400 |
This is an automated email from the git hooks/post-receive script.
janneke pushed a commit to branch master
in repository guix-artwork.
The following commit(s) were added to refs/heads/master by this push:
new ce65d93 website: Add draft post about the further-reduced binary
bootstrap.
ce65d93 is described below
commit ce65d93a0949e1944e2d0a080c79c5f5a589eacf
Author: Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
AuthorDate: Wed Jun 10 13:35:12 2020 +0200
website: Add draft post about the further-reduced binary bootstrap.
* website/drafts/further-reduced-binary-bootstrap.md: New file.
---
website/drafts/further-reduced-binary-bootstrap.md | 202 ++++++
.../static/blog/img/gcc-core-mesboot0-graph.svg | 679 +++++++++++++++++++++
2 files changed, 881 insertions(+)
diff --git a/website/drafts/further-reduced-binary-bootstrap.md
b/website/drafts/further-reduced-binary-bootstrap.md
new file mode 100644
index 0000000..c45db5e
--- /dev/null
+++ b/website/drafts/further-reduced-binary-bootstrap.md
@@ -0,0 +1,202 @@
+title: Guix Further Reduces Bootstrap Seed to 25%
+date: 2020-06-15 00:00
+author: Jan Nieuwenhuizen
+tags: Bootstrapping, Reproducible builds
+---
+We are delighted to announce that the second reduction by 50% of the
+Guix _bootstrap binaries_ has now been officially released!
+
+The initial set of binaries from which packages are built now weighs
+in at approximately 60 MB, a quarter of what it used to be.
+
+In [a previous blog
+post](https://guix.gnu.org/blog/2019/guix-reduces-bootstrap-seed-by-50/)
+we elaborate on why this reduction and bootstrappability in general is
+so important. Last summer at the [Breaking Bitcoin
+conference](https://breaking-bitcoin.com), Carl Dong gave a [fun and
+remarkably gentle
+introduction](http://diyhpl.us/wiki/transcripts/breaking-bitcoin/2019/bitcoin-build-system)
+and at [FOSDEM2020](https://fosdem.org/2020) I also gave [a short talk
+](https://fosdem.org/2020/schedule/event/gnumes/) about this.
+
+#### Further Reduced Binary Seed bootstrap
+
+Last year, the first reduction removed the gcc, glibc and binutils
+binary seeds; the new _Further Reduced Binary Seed_ bootstrap removes
+the static-binaries tarball (a.k.a. `%bootstrap-coreutils&co`)
+containing GNU Awk, Bash, Bzip2, the GNU Core Utilities, Grep, Gzip,
+GNU Make, Patch, sed, Tar, and XZ; and replaces them by [Gash and Gash
+Utils](https://savannah.nongnu.org/projects/gash).
+
+After three new [GNU Mes](https://gnu.org/s/mes) releases with
+numerous Mes C Library updates and fixes, a major update of Gash and
+the first official Gash Utils release, and the [delicate balancing of
+17 new bootstrap source packages and
+versions](https://bugs.gnu.org/38390), the bottom of the package graph
+now looks like this (woohoo!):
+
+```
+ gcc-mesboot (4.9.4)
+ ^
+ |
+ (...)
+ ^
+ |
+ binutils-mesboot (2.14), glibc-mesboot (2.2.5),
+ gcc-core-mesboot (2.95.3)
+ ^
+ |
+ bash-mesboot (2.05), bzip2-mesboot, gawk-mesboot (3.0.0)
+ diffutils-mesboot, patch-mesboot, sed-mesboot (1.18)
+ ^
+ |
+ gnu-make-mesboot (3.82)
+ ^
+ |
+ gzip-mesboot
+ ^
+ |
+ tcc-boot
+ ^
+ |
+ mes-boot
+ ^
+ |
+ gash-boot, gash-utils-boot
+ ^
+ |
+ *
+ bootstrap-mescc-tools, bootstrap-mes (~12MB)
+ bootstrap-guile (~48MB)
+```
+[full graph](../../../static/blog/img/gcc-core-mesboot0-graph.svg)
+
+We are excited that the [Nlnet Foundation](https://nlnet.nl) has
+[sponsored this work](https://nlnet.nl/project/GNUMes)!
+
+However, we aren't done yet; far from it.
+
+### Lost Paths
+
+Readers who are familiar with the GNU toolchain may have noticed
+the version numbers of the ``*-mesboot`` source packages in this
+great new bootstrap: they are ancient! That's a problem.
+
+Typically, newer versions of the tool chain fix all kinds of bugs,
+make the software easier to build and add support for new CPU
+architectures, which is great. However---more often than not---
+simultaneously new features are introduced or dependencies are added
+that are not necessary for bootstrapping, but may increase the
+bootstrap hurdle. Sometimes, newer tools are more strict or old
+configure scripts do not recognise newer tool versions.
+
+A trivial example is GNU sed. In the current bootstrap we are using
+version 1.18, which was released in 1993. Until recently the latest
+version of sed we could hope to bootstrap was sed-4.2.2 (2012). Newer
+releases ship as `xz`-compressed tarballs only, and `xz` is
+notoriously difficult to bootstrap (it needs a fairly recent GCC and
+try building that without sed).
+
+Luckily, the sed maintainers (Jim Meyering) were happy to correct this
+mistake and starting from release
+[sed-4.8](http://ftp.gnu.org/pub/gnu/sed/sed-4.8.tar.gz) (2020) also
+`gzip`-compressed tarballs will be shipped. Similar for the GNU Core
+Utils: releases made between 2011 and 2019 will probably be useless
+for bootstrapping. Confronted with this information, also the
+coreutils maintainers (Pádraig Brady) were happy to release
+[coreutils-8.32](http://ftp.gnu.org/pub/gnu/coreutils/coreutils-8.32.tar.gz)
+also in `gzip' compression from now on.
+
+Even these simple cases show that solving bootstrap problems can only
+be done together: For GNU it really is a project-wide responsibility
+that needs to be addressed.
+
+Most bootstrap problems or loops are not so easy to solve and
+sometimes there are no obvious answers, for example:
+
+* In 2013, the year that [Reproducible
+ Builds](https://reproducible-builds.org) started to gain some
+ traction, the GNU Compiler Collection [released
+ gcc-4.8.0](http://gcc.gnu.org/gcc-4.8/changes.html),
+ making C++ a build requirement, and
+
+* Even more recently (2018), the GNU C Library [glibc-2.28 adds Python
+ as a build
+
requirement](https://sourceware.org/git/?p=glibc.git;a=commit;h=c6982f7efc1c70fe2d6160a87ee44d871ac85ab0),
+
+and while these examples make for a delightful puzzle from a
+bootstrappability perspective, we would love to see the maintainers of
+GNU softwares to start taking more responsibility for the bootstrap
+story of their packages.
+
+#### Towards a Full Source Bootstrap
+
+Our next target will be a third reduction by ~50%; the Full-Source
+bootstrap will replace the MesCC-Tools and GNU Mes binaries by
+[Stage0](https://savannah.nongnu.org/projects/stage0) and
+[M2-Planet](https://github.com/oriansj/m2-planet).
+
+The Stage0 project by Jeremiah Orians starts everything from ~512
+bytes; virtually nothing. Have a look at this incredible project if
+you haven’t already done so.
+
+We are grateful and excited that the [Nlnet
+Foundation](https://nlnet.nl) has [again decided to sponsor this
+work](https://nlnet.nl/project/https://nlnet.nl/project/GNUMes-fullsource/).
+
+@Danny: Could you say some words on bringing the reduced binary seed
+bootstrap to ARM/AARCH64?
+
+[Trusted ARM bootstrap](https://nlnet.nl/project/GNUMes-arm/)
+
+@Timothy: could you add some words on Gash / Gash Utils0.3: enabling
+the removal of ancient tools like sed-1.18 or so?
+
+#### About Bootstrappable Builds and GNU Mes
+
+Software is bootstrappable when it does not depend on a binary seed
+that cannot be built from source. Software that is not
+bootstrappable---even if it is free software---is a serious security
+risk
+[for](https://www.ece.cmu.edu/~ganger/712.fall02/papers/p761-thompson.pdf)
+[a](https://manishearth.github.io/blog/2016/12/02/reflections-on-rusting-trust/)
+[variety](https://www.quora.com/What-is-a-coders-worst-nightmare/answer/Mick-Stute)
+[of](http://blog.regehr.org/archives/1241)
+[reasons](https://www.alchemistowl.org/pocorgtfo/pocorgtfo08.pdf).
+The [Bootstrappable Builds](https://bootstrappable.org/) project aims
+to reduce the number and size of binary seeds to a bare minimum.
+
+[GNU Mes](https://www.gnu.org/software/mes/) is closely related to the
+Bootstrappable Builds project. Mes aims to create an entirely
+source-based bootstrapping path for the Guix System and other
+interested GNU/Linux distributions. The goal is to start from a
+minimal, easily inspectable binary (which should be readable as
+source) and bootstrap into something close to R6RS Scheme.
+
+Currently, Mes consists of a mutual self-hosting scheme interpreter
+and C compiler. It also implements a C library. Mes, the scheme
+interpreter, is written in about 5,000 lines of code of simple C.
+MesCC, the C compiler, is written in scheme. Together, Mes and MesCC
+can compile [a lightly patched
+TinyCC](http://gitlab.com/janneke/tinycc) that is self-hosting. Using
+this TinyCC and the Mes C library, it is possible to bootstrap the
+entire Guix System for i686-linux and x86_64-linux.
+
+#### About GNU Guix
+
+[GNU Guix](https://www.gnu.org/software/guix) is a transactional package
+manager and an advanced distribution of the GNU system that [respects
+user
+freedom](https://www.gnu.org/distros/free-system-distribution-guidelines.html).
+Guix can be used on top of any system running the kernel Linux, or it
+can be used as a standalone operating system distribution for i686,
+x86_64, ARMv7, and AArch64 machines.
+
+In addition to standard package management features, Guix supports
+transactional upgrades and roll-backs, unprivileged package management,
+per-user profiles, and garbage collection. When used as a standalone
+GNU/Linux distribution, Guix offers a declarative, stateless approach to
+operating system configuration management. Guix is highly customizable
+and hackable through [Guile](https://www.gnu.org/software/guile)
+programming interfaces and extensions to the
+[Scheme](http://schemers.org) language.
diff --git a/website/static/blog/img/gcc-core-mesboot0-graph.svg
b/website/static/blog/img/gcc-core-mesboot0-graph.svg
new file mode 100644
index 0000000..5d97db7
--- /dev/null
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@@ -0,0 +1,679 @@
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- branch master updated: website: Add draft post about the further-reduced binary bootstrap.,
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