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 ** Remove dependency on OpenSSL
  18
  19 The ‘openssl’ command-line tool is used in libstore to sign store paths
  20 to be exported, and to check such signatures.  The signing keys are
  21 usually in /etc/nix/signing-key.{pub,sec}.  They are a PKCS#8-encoded
  22 X.509 SubjectPublicKeyInfo.  These can be decoded with the [[http://lists.gnu.org/archive/html/help-gnutls/2012-12/msg00012.html][C API of
  23 GnuTLS]], but not yet with its Guile bindings.  There’s also
  24 ‘gnutls_privkey_sign_data’ to sign, and related functions.
  25
  26 * infrastructure
  27
  28 ** have a Hydra instance build Guix packages
  29
  30 [[http://nixos.org/hydra/][Hydra]] is a continuous integration tool based on Nix.  It now has
  31 [[https://github.com/NixOS/hydra/commit/f27ae1d5663680400cb99cfb898970f34d8d21be][Guile/Guix support]], which allows “build recipes” written in Guile using
  32 Guix to be used directly on Hydra.
  33
  34 For a start, we may use the instance at hydra.nixos.org, generously
  35 provided by TU Delft.  However, in the future, we may want to setup our
  36 own instance at gnu.org.
  37
  38 * extend <origin>
  39 ** add OpenPGP signatures:
  40
  41    (origin
  42      (method http-fetch)
  43      (uri "http://.../foo.tgz")
  44      (signature-uri (string-append uri ".sig"))
  45      (signer-openpgp-fingerprint "..."))
  46
  47 ** allow <origin> to be a derivation/package or a file
  48
  49 * extend <package>
  50
  51 ** add support for ‘search-paths’
  52
  53 This should be passed to the build system, to extend package-specific
  54 search path environment variables–like ‘GUILE_LOAD_PATH’, ‘PERL5LIB’,
  55 etc.
  56
  57 ** add a ‘user-environment-hook’
  58
  59 This should specify builder code to be run when building a user
  60 environment with ‘guix-package’.  For instance, Texinfo’s hook would
  61 create a new ‘dir’.
  62
  63 ** add ‘patches’ there
  64
  65 ** extend ‘propagated-build-inputs’ with support for multiple outputs
  66
  67 #+BEGIN_SRC scheme
  68   (outputs '("out" "include"))
  69   (propagated-build-inputs
  70     `(((("i1" ,p1 "o1")
  71         ("i2" ,p2))
  72        => "include")
  73       ("i3" ,p3)))
  74 #+END_SRC
  75
  76 * support cross-compilation
  77
  78 Implement ‘package-cross-derivation’, and add the corresponding code in
  79 ‘gnu-build-system’.  Then, actually bootstrap a cross-compilation
  80 environment–e.g., a cross-GNU environment.
  81
  82 * gnu-build-system: produce a ‘debug’ derivation
  83
  84 Set a .gnu_debuglink in the main derivations to point to the sibling
  85 file name (only the basename, to not retain a dependency on the ‘debug’
  86 derivation.)
  87
  88 For /nix/store/xyz-foobar/bin/foo, we should have
  89 /nix/store/abc-foobar-debug/lib/nix/store/xyz-foobar/bin/foo.debug (info
  90 "(gdb) Separate Debug Files").
  91
  92 Users should have a default GDB setting with ~/.guix-profile/lib/debug
  93 as their ‘debug-file-directory’.
  94
  95 * build-expression->derivation: define `%system' in the builder
  96
  97 Would allow build expressions to have system-dependent code, like
  98 `glibc-dynamic-linker'.
  99
 100 * add ‘allowed-references’ in <package>
 101
 102 [[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]].
 103
 104
 105 * union
 106
 107 Support sophisticated collision handling when building a union: check
 108 whether the colliding files are identical, honor per-package priorities,
 109 etc.
 110
 111 * guix-package
 112
 113 ** add ‘--roll-back’
 114 ** add ‘--list-generations’, and ‘--delete-generations’
 115 ** add ‘--upgrade’
 116 ** add ‘--search’
 117
 118 * guix build utils
 119 ** Add equivalent to "rm -rf"
 120 ** Add equivalent to Nixpkgs's ‘wrapProgram’
 121 ** Add equivalent to chrpath, possibly using [[https://gitorious.org/guile-dlhacks/guile-dlhacks/][guile-dlhacks]]
 122
 123 * distro
 124 ** choose a name! (Jinn?)
 125 ** port to new GNU/Linux platforms, notably ‘mipsel64-linux’
 126 ** port to GNU/Hurd, aka. ‘i686-gnu’
 127
 128 Problems include that current glibc releases do not build on GNU/Hurd.
 129 In addition, there haven’t been stable releases of GNU Mach, MiG, and
 130 Hurd, which would be a pre-condition.
 131
 132 ** make a bootable GNU/Linux-Libre distro, with OS configuration EDSL
 133
 134 Similar in spirit to /etc/nixos/configuration.nix.