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branch master updated: website: Add draft post on the Full-Source Bootst
|
From: |
Jan Nieuwenhuizen |
|
Subject: |
branch master updated: website: Add draft post on the Full-Source Bootstrap. |
|
Date: |
Wed, 26 Apr 2023 03:34:38 -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 10f5eb0 website: Add draft post on the Full-Source Bootstrap.
10f5eb0 is described below
commit 10f5eb039390e21c431192d76b0bd59d60f9c912
Author: Janneke Nieuwenhuizen <janneke@gnu.org>
AuthorDate: Wed Apr 26 08:57:54 2023 +0200
website: Add draft post on the Full-Source Bootstrap.
* website/drafts/full-source-bootstrap.md,
website/static/blog/img/gcc-core-mesboot0-full-source-bootstrap-graph.svg:
New files.
---
website/drafts/full-source-bootstrap.md | 243 +++++++++++
...c-core-mesboot0-full-source-bootstrap-graph.svg | 469 +++++++++++++++++++++
2 files changed, 712 insertions(+)
diff --git a/website/drafts/full-source-bootstrap.md
b/website/drafts/full-source-bootstrap.md
new file mode 100644
index 0000000..c6c5afb
--- /dev/null
+++ b/website/drafts/full-source-bootstrap.md
@@ -0,0 +1,243 @@
+title: Guix Full-Source Bootstrap
+date: 2023-04-30 12:00
+author: Janneke Nieuwenhuizen, Ludovic Courtès
+tags: Bootstrapping, Reproducible builds, Security
+---
+We are delighted and somewhat relieved to announce that the third
+reduction by about 50% of the Guix _bootstrap binaries_ has now been
+officially released! Also known as: The Full-Source Bootstrap.
+
+The initial set of binaries from which packages are built now weighs
+in at 25~MiB, about a tenth of what it used to be. If that doesn't
+sound exciting enough, then consider that the only traditional
+bootstrap binary that now remains is `guile-bootstrap`: the driver
+that Guix uses to build packages.
+
+### FIXME: how is guile-bootstrap unpacked, don't we also have tar,
+### xz, bash as bootstrap binaries or are bootar/gash used here too?
+
+To put it differently: With this release, the Guix package graph (for
+x86_64-linux) is now rooted in a 357-byte binary!
+
+In [two previous
+](https://guix.gnu.org/blog/2020/guix-further-reduces-bootstrap-seed-to-25/)
+[blog
+post](https://guix.gnu.org/blog/2019/guix-reduces-bootstrap-seed-by-50/)
+we elaborated on why this reduction and bootstrappability in general
+is so important.
+
+One reason is to properly address supply chain security concerns. The
+Bitcoin community was one of the first to recognize its importance
+well enough to put the idea into practice. At the [Breaking Bitcoin
+conference 2020](https://breaking-bitcoin.com), Carl Dong gave a [fun
+and remarkably gentle
+introduction](http://diyhpl.us/wiki/transcripts/breaking-bitcoin/2019/bitcoin-build-system).
+At the end of his talk, he states
+
+```
+The holy grail for bootstrappability will be connecting `hex0` to `mes`. --
Carl Dong
+```
+
+Two years ago at [FOSDEM2021](https://fosdem.org/2021) I gave [a short
+talk ](https://fosdem.org/2021/schedule/event/gnumes/) about how we
+were planning to continue this quest.
+
+If you choose to believe that building from source is the proper way
+to do computing, then it follows that the [“trusting
+trust”](https://www.archive.ece.cmu.edu/~ganger/712.fall02/papers/p761-thompson.pdf)
+attack is only a symptom of an incomplete or missing bootstrap story.
+
+#### Full-Source Bootstrap
+
+Three years ago, the _bootstrap binaries_ were reduced to just [GNU
+Mes](https://www.gnu.org/software/mes) and
+[MesCC-Tools](https://savannah.nongnu.org/projects/mescc-tools) (and
+the driver to build Guix packages: a [static
+build](https://alpha.gnu.org/pub/gnu/guix/bootstrap/x86_64-linux/20131110/guile-2.0.9.tar.xz)
+of [GNU Guile](https://www.gnu.org/software/guile) 2.0.9).
+
+The new _Full-Source Bootstrap_, merged in Guix `master` this month,
+removes the binaries for Mes and MesCC-Tools and replaces them by
[bootstrap-seeds](https://github.com/oriansj/bootstrap-seeds). For x86-linux
(which is also used by the x86_64-linux build), this means this program
+[hex0-seed](https://github.com/oriansj/bootstrap-seeds/blob/master/POSIX/x86/hex0-seed),
with ASCII-equivalent
+[hex0_x86.hex0](https://github.com/oriansj/bootstrap-seeds/blob/master/POSIX/x86/hex0_x86.hex0).
Hex0 is self-hosting and its source looks like this:
+
+```
+ ; Where the ELF Header is going to hit
+ ; Simply jump to _start
+ ; Our main function
+ # :_start ; (0x8048054)
+ 58 # POP_EAX ; Get the number of arguments
+```
+
+you can spot two types of line-comment: hex0 (`;`) and assembly (`#`).
+The only program-code in this snippet is `58`: two hexidecimal digits
+that are taken as two nibbles and compiled into the corresponding byte
+with binary value `58`.
+
+Starting from this 357-byte hex0-seed binary provided by the
+`bootstrap-seeds`, the [stage0-posix
+package](https://github.com/oriansj/stage0-posix) created by Jeremiah
+Orians first builds hex0 and then all the way up: hex1, catm, hex2,
+M0, cc_x86, M1, M2, get_machine (that's all of MesCC-Tools), and
+finally [M2-Planet](https://github.com/oriansj/m2-planet).
+
+The new [GNU Mes](https://gnu.org/s/mes) v0.24 release can be built
+with M2-Planet. This time with only a [remarkably small change]
+(https://issues.guix.gnu.org/55227), the bottom of the package graph
+now looks like this (woohoo!):
+
+```
+ gcc-mesboot (4.9.4)
+ ^
+ |
+ (...)
+ ^
+ |
+ binutils-mesboot (2.20.1a), glibc-mesboot (2.2.5),
+ gcc-core-mesboot (2.95.3)
+ ^
+ |
+ patch-mesboot (2.5.9)
+ ^
+ |
+ bootstrappable-tcc (0.9.26+31 patches)
+ ^
+ |
+ gnu-make-mesboot0 (3.80)
+ ^
+ |
+ gzip-mesboot (1.2.4)
+ ^
+ |
+ tcc-boot (0.9.27)
+ ^
+ |
+ mes-boot (0.24.2)
+ ^
+ |
+ stage0-posix (hex0..M2-Planet)
+ ^
+ |
+ gash-boot, gash-utils-boot
+ ^
+ |
+ *
+ bootstrap-seeds (357-bytes for x86)
+ ~~~
+ [bootstrap-guile-2.0.9 driver (~25 MiB)]
+```
+[full
graph](/static/blog/img/gcc-core-mesboot0-full-source-bootstrap-graph.svg)
+
+We are excited that the [NLnet Foundation](https://nlnet.nl) has [been
+sponsoring this work](https://nlnet.nl/project/GNUMes-fullsource)!
+
+However, we aren't done yet; far from it.
+
+### Lost Paths
+
+The idea of reproducible builds and bootstrappable software [is not
+very
+new](https://lists.reproducible-builds.org/pipermail/rb-general/2017-January/000309.html).
+Much of that was implemented for the GNU tools in the early 1990s.
+Working to recreate it in present time shows us much of that practice
+was forgotten.
+
+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 consider bootstrappability and start taking more
+responsibility for the bootstrap story of their packages.
+
+#### Towards a Universal, Full-Source Bootstrap
+
+We are most grateful and excited that the [Nlnet
+Foundation](https://nlnet.nl) has [decided to continue sponsoring this
+work](https://nlnet.nl/project/GNUMes-ARM_RISC-V)!
+
+While the reduced bootstrap currently only applies to the i686-linux
+and x86_64-linux architectures, we are thrilled that ARM and RISC-V
+will be joining soon.
+
+Some time ago, Wladimir van der Laan contributed initial RISC-V
+support for Mes but a major obstacle for the RISC-V bootstrap is that
+the “vintage” GCC-2.95.3 that was such a helpful stepping stone does
+not support RISC-V. Worse, the RISC-V port of GCC was introduced only
+in GCC 7.5.0; a version that requires c++ to build and cannot be
+bootstrapped! To this end, we have been working to make Mes support
+building GCC 4.6.5, while Ekaitz Zarraga has been working on
+[backporting RISC-V support to GCC
+4.6.5](https://nlnet.nl/project/GNUMes-RISCV/) and backporting RISC-V
+support from latest tcc to our bootstrappable-tcc.
+
+Another interesting joint development effort with Timothy Samplet
+addresses the dependency on guile-bootstrap of Gash and Gash-Utils.
+On the one hand, Mes is gaining a higher level of Guile-compatibility:
+hash table interface, record interface, variables and variable-lookup,
+and Guile (source) module loading support. On the other hand, Gash
+and Gash-Utils are getting Mes compatibility for features that Mes is
+lacking (notably syntax-case macros). If we pull this off, the
+guile-bootstrap dependency will be reduced to bootar and as the driver
+for Guix.
+
+Where a full-source bootstrap was once deemed (almost) impossible,
+there are still some dauting tasks ahead. What about the Linux
+kernel? The good news is that the bootstrappable community has grown
+a lot, from two people six years ago there are now around 100 people
+in the `#bootstrappable` IRC-channel. Interesting times ahead!
+
+#### 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 (supply chain security)
+[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 is used in the full-source
+bootstrap path for the Guix System.
+
+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 and
+can be built with [M2-Planet](https://github.com/oriansj/m2-planet).
+MesCC, the C compiler, is written in scheme. Together, Mes and MesCC
+can compile [bootstrappable TinyCC](http://gitlab.com/janneke/tinycc)
+that is self-hosting. Using this TinyCC and the Mes C library, the
+entire Guix System for i686-linux and x86_64-linux is bootstrapped.
+
+#### About GNU Guix
+
+[GNU Guix](https://guix.gnu.org) 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 Hurd or the Linux
+kernel, or it can be used as a standalone operating system distribution
+for i686, x86_64, ARMv7, AArch64 and POWER9 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-full-source-bootstrap-graph.svg
b/website/static/blog/img/gcc-core-mesboot0-full-source-bootstrap-graph.svg
new file mode 100644
index 0000000..5650143
--- /dev/null
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@@ -0,0 +1,469 @@
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