TODO

   1 -*- mode: org; coding: utf-8; -*-
   2
   3 Copyright © 2012 Ludovic Courtès <ludo@gnu.org>
   4
   5   Copying and distribution of this file, with or without modification,
   6   are permitted in any medium without royalty provided the copyright
   7   notice and this notice are preserved.
   8
   9 * integrate needed Nix code
  10
  11 Guix uses Nix’s daemon (‘nix-worker’, later renamed to ‘nix-daemon’) to
  12 actually perform builds, scheduling, substitution of pre-built binaries,
  13 and GC-related tasks.  The daemon mainly uses ‘libstore’ from Nix.
  14 Integrating it in Guix itself will make Guix self-contained, thereby
  15 simplifying our users’ lives.
  16
  17 * infrastructure
  18
  19 ** have a Hydra instance build Guix packages
  20
  21 [[http://nixos.org/hydra/][Hydra]] is a continuous integration tool based on Nix.  It now has
  22 [[https://github.com/NixOS/hydra/commit/f27ae1d5663680400cb99cfb898970f34d8d21be][Guile/Guix support]], which allows “build recipes” written in Guile using
  23 Guix to be used directly on Hydra.
  24
  25 For a start, we may use the instance at hydra.nixos.org, generously
  26 provided by TU Delft.  However, in the future, we may want to setup our
  27 own instance at gnu.org.
  28
  29 * extend <origin>
  30 ** add OpenPGP signatures:
  31
  32    (origin
  33      (method http-fetch)
  34      (uri "http://.../foo.tgz")
  35      (signature-uri (string-append uri ".sig"))
  36      (signer-openpgp-fingerprint "..."))
  37
  38 ** allow <origin> to be a derivation/package or a file
  39
  40 * extend <package>
  41
  42 ** add support for ‘search-paths’
  43
  44 This should be passed to the build system, to extend package-specific
  45 search path environment variables–like ‘GUILE_LOAD_PATH’, ‘PERL5LIB’,
  46 etc.
  47
  48 ** add a ‘user-environment-hook’
  49
  50 This should specify builder code to be run when building a user
  51 environment with ‘guix-package’.  For instance, Texinfo’s hook would
  52 create a new ‘dir’.
  53
  54 ** add ‘patches’ there
  55
  56 ** extend ‘propagated-build-inputs’ with support for multiple outputs
  57
  58 #+BEGIN_SRC scheme
  59   (outputs '("out" "include"))
  60   (propagated-build-inputs
  61     `(((("i1" ,p1 "o1")
  62         ("i2" ,p2))
  63        => "include")
  64       ("i3" ,p3)))
  65 #+END_SRC
  66
  67 * support cross-compilation
  68
  69 Implement ‘package-cross-derivation’, and add the corresponding code in
  70 ‘gnu-build-system’.  Then, actually bootstrap a cross-compilation
  71 environment–e.g., a cross-GNU environment.
  72
  73 * gnu-build-system: produce a ‘debug’ derivation
  74
  75 Set a .gnu_debuglink in the main derivations to point to the sibling
  76 file name (only the basename, to not retain a dependency on the ‘debug’
  77 derivation.)
  78
  79 For /nix/store/xyz-foobar/bin/foo, we should have
  80 /nix/store/abc-foobar-debug/lib/nix/store/xyz-foobar/bin/foo.debug (info
  81 "(gdb) Separate Debug Files").
  82
  83 Users should have a default GDB setting with ~/.guix-profile/lib/debug
  84 as their ‘debug-file-directory’.
  85
  86 * build-expression->derivation: define `%system' in the builder
  87
  88 Would allow build expressions to have system-dependent code, like
  89 `glibc-dynamic-linker'.
  90
  91 * add ‘allowed-references’ in <package>
  92
  93 [[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]].
  94
  95
  96 * union
  97
  98 Support sophisticated collision handling when building a union: check
  99 whether the colliding files are identical, honor per-package priorities,
 100 etc.
 101
 102 * guix-package
 103
 104 ** add ‘--roll-back’
 105 ** add ‘--list-generations’, and ‘--delete-generations’
 106 ** add ‘--upgrade’
 107 ** add ‘--list-installed’ and ‘--list-available’
 108 ** add ‘--search’
 109
 110 * guix build utils
 111 ** Add equivalent to "rm -rf"
 112 ** Add equivalent to Nixpkgs's ‘wrapProgram’
 113 ** Add equivalent to chrpath, possibly using [[https://gitorious.org/guile-dlhacks/guile-dlhacks/][guile-dlhacks]]
 114
 115 * distro
 116 ** choose a name! (Jinn?)
 117 ** port to new GNU/Linux platforms, notably ‘mipsel64-linux’
 118 ** port to GNU/Hurd, aka. ‘i686-gnu’
 119
 120 Problems include that current glibc releases do not build on GNU/Hurd.
 121 In addition, there haven’t been stable releases of GNU Mach, MiG, and
 122 Hurd, which would be a pre-condition.
 123
 124 ** make a bootable GNU/Linux-Libre distro, with OS configuration EDSL
 125
 126 Similar in spirit to /etc/nixos/configuration.nix.