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-*- mode: org; coding: utf-8; -*-
Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
* integrate needed Nix code
Guix uses Nix’s daemon (‘nix-worker’, later renamed to ‘nix-daemon’) to
actually perform builds, scheduling, substitution of pre-built binaries,
and GC-related tasks. The daemon mainly uses ‘libstore’ from Nix.
Integrating it in Guix itself will make Guix self-contained, thereby
simplifying our users’ lives.
** Remove dependency on OpenSSL
The ‘openssl’ command-line tool is used in libstore to sign store paths
to be exported, and to check such signatures. The signing keys are
usually in /etc/nix/signing-key.{pub,sec}. They are a PKCS#8-encoded
X.509 SubjectPublicKeyInfo. These can be decoded with the [[http://lists.gnu.org/archive/html/help-gnutls/2012-12/msg00012.html][C API of
GnuTLS]], but not yet with its Guile bindings. There’s also
‘gnutls_privkey_sign_data’ to sign, and related functions.
** Add a binary cache substituter
Like scripts/download-from-binary-cache.pl in Nix, but written in
Scheme. Substituters allow pre-built binaries to be downloaded when
they are available from a trusted source.
** Add a remote build hook
Like scripts/build-remote.pl in Nix.
* infrastructure
** have a Hydra instance build Guix packages
[[http://nixos.org/hydra/][Hydra]] is a continuous integration tool based on Nix. It now has
[[https://github.com/NixOS/hydra/commit/f27ae1d5663680400cb99cfb898970f34d8d21be][Guile/Guix support]], which allows “build recipes” written in Guile using
Guix to be used directly on Hydra.
For a start, we may use the instance at hydra.nixos.org, generously
provided by TU Delft. However, in the future, we may want to setup our
own instance at gnu.org.
* extend <origin>
** add OpenPGP signatures:
(origin
(method http-fetch)
(uri "http://.../foo.tgz")
(signature-uri (string-append uri ".sig"))
(signer-openpgp-fingerprint "..."))
** allow <origin> to be a derivation/package or a file
* extend <package>
** add support for ‘search-paths’
This should be passed to the build system, to extend package-specific
search path environment variables–like ‘GUILE_LOAD_PATH’, ‘PERL5LIB’,
etc.
** add a ‘user-environment-hook’
This should specify builder code to be run when building a user
environment with ‘guix-package’. For instance, Texinfo’s hook would
create a new ‘dir’.
** add ‘patches’ there
** extend ‘propagated-build-inputs’ with support for multiple outputs
#+BEGIN_SRC scheme
(outputs '("out" "include"))
(propagated-build-inputs
`(((("i1" ,p1 "o1")
("i2" ,p2))
=> "include")
("i3" ,p3)))
#+END_SRC
* support cross-compilation
Implement ‘package-cross-derivation’, and add the corresponding code in
‘gnu-build-system’. Then, actually bootstrap a cross-compilation
environment–e.g., a cross-GNU environment.
* gnu-build-system: produce a ‘debug’ derivation
Set a .gnu_debuglink in the main derivations to point to the sibling
file name (only the basename, to not retain a dependency on the ‘debug’
derivation.)
For /nix/store/xyz-foobar/bin/foo, we should have
/nix/store/abc-foobar-debug/lib/nix/store/xyz-foobar/bin/foo.debug (info
"(gdb) Separate Debug Files").
Users should have a default GDB setting with ~/.guix-profile/lib/debug
as their ‘debug-file-directory’.
* build-expression->derivation: define `%system' in the builder
Would allow build expressions to have system-dependent code, like
`glibc-dynamic-linker'.
* add ‘allowed-references’ in <package>
[[file:~/src/nix/src/libstore/build.cc::if%20(drv.env.find("allowedReferences")%20!%3D%20drv.env.end())%20{][See how Nix implements that internally]].
* union
Support sophisticated collision handling when building a union: check
whether the colliding files are identical, honor per-package priorities,
etc.
* guix-package
** add ‘--roll-back’
** add ‘--list-generations’, and ‘--delete-generations’
** add ‘--upgrade’
** add ‘--search’
* guix build utils
** Add equivalent to "rm -rf"
** Add equivalent to Nixpkgs's ‘wrapProgram’
** Add equivalent to chrpath, possibly using [[https://gitorious.org/guile-dlhacks/guile-dlhacks/][guile-dlhacks]]
* distro
** choose a name! (Jinn?)
** port to new GNU/Linux platforms, notably ‘mipsel64-linux’
** port to GNU/Hurd, aka. ‘i686-gnu’
Problems include that current glibc releases do not build on GNU/Hurd.
In addition, there haven’t been stable releases of GNU Mach, MiG, and
Hurd, which would be a pre-condition.
** make a bootable GNU/Linux-Libre distro, with OS configuration EDSL
Similar in spirit to /etc/nixos/configuration.nix.
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