3
5
Fork 0
mirror of git://git.savannah.gnu.org/guix.git synced 2023-12-14 03:33:07 +01:00
guix/HACKING
Ludovic Courtès 8b2d9e5d44 doc: Improve build instructions in README and HACKING.
* README (Requirements): Remove Nixpkgs.  Remove mentions of building
  from Git.
  (Installation): Refer to the manual.
* HACKING: List requirements for when building from Git.
  Remove the `dot: Command not found' error.
2013-07-19 00:07:03 +02:00

157 lines
6.2 KiB
Org Mode
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

-*- mode: org; coding: utf-8; -*-
#+TITLE: Hacking GNU Guix and Its Incredible Distro
Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.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.
* Building from Git
When building Guix from a checkout, the following packages are required in
addition to those mentioned in the installation instructions:
- [[http://www.gnu.org/software/autoconf/][GNU Autoconf]]
- [[http://www.gnu.org/software/automake/][GNU Automake]]
- [[http://www.gnu.org/software/gettext/][GNU Gettext]]
- [[http://www.graphviz.org/][Graphviz]]
Run ./bootstrap to download the Nix daemon source code and to generate the
build system infrastructure using autoconf. It reports an error if an
inappropriate version of the above packages is being used.
The bootstrap script, among other things, invokes git submodule update; if
you didnt run it, you may get the following error:
make: *** No rule to make target `nix/libstore/schema.sql', needed by
`nix/libstore/schema.sql.hh'
Then, as always, run ./configure. If you get an error like this one:
./configure: line 6755: `PKG_CHECK_MODULES(GUILE, guile-2.0 >= 2.0.5)'
it probably means that Autoconf couldnt find pkg.m4, which is provided by
pkg-config. Make sure that pkg.m4 is available. For instance, if you
installed Automake in /usr/local, it wouldnt look for .m4 files in
/usr/share. So you have to invoke the following command in that case
$ export ACLOCAL_PATH=/usr/share/aclocal
See “info '(automake) Macro Search Path'” for more information.
Finally, you have to invoke make check to run tests. If anything fails,
take a look at “info '(guix) Installation'” or send a message to
<guix-devel@gnu.org>.
* Running Guix before it is installed
Command-line tools can be used even if you have not run "make install".
To do that, prefix each command with ./pre-inst-env, as in:
./pre-inst-env guix build --help
Similarly, for a Guile session using the Guix modules:
./pre-inst-env guile -c '(use-modules (guix utils)) (pk (%current-system))'
The pre-inst-env script sets up all the environment variables
necessary to support this.
* The Perfect Setup
The Perfect Setup to hack on Guix is basically the perfect setup used
for Guile hacking (info "(guile) Using Guile in Emacs"). First, you
need more than an editor, you need [[http://www.gnu.org/software/emacs][Emacs]], empowered by the wonderful
[[http://nongnu.org/geiser/][Geiser]].
Geiser allows for interactive and incremental development from within
Emacs: code compilation and evaluation from within buffers, access to
on-line documentation (docstrings), context-sensitive completion, M-. to
jump to an object definition, a REPL to try out your code, and more.
To actually edit the code, Emacs already has a neat Scheme mode. But in
addition to that, you must not miss [[http://www.emacswiki.org/emacs/ParEdit][Paredit]]. It provides facilities to
directly operate on the syntax tree, such as raising an s-expression or
wrapping it, swallowing or rejecting the following s-expression, etc.
* Adding new packages
Package recipes in Guix look like this:
#+BEGIN_SRC scheme
(package
(name "nettle")
(version "2.5")
(source
(origin
(method url-fetch)
(uri (string-append "mirror://gnu/nettle/nettle-"
version ".tar.gz"))
(sha256
(base32
"0wicr7amx01l03rm0pzgr1qvw3f9blaw17vjsy1301dh13ll58aa"))))
(build-system gnu-build-system)
(inputs `(("m4" ,m4)))
(propagated-inputs `(("gmp" ,gmp)))
(home-page
"http://www.lysator.liu.se/~nisse/nettle/")
(synopsis "GNU Nettle, a cryptographic library")
(description
"Nettle is a cryptographic library...")
(license gpl2+))
#+END_SRC
Such a recipe can be written by hand, and then tested by running
./pre-inst-env guix build nettle.
When writing the recipe, the base32-encoded SHA256 hash of the source
code tarball, which can be seen in the example above, can be obtained by
running:
guix download http://ftp.gnu.org/gnu/nettle/nettle-2.5.tar.gz
Alternatively, it is possible to semi-automatically import recipes from
the [[http://nixos.org/nixpkgs/][Nixpkgs]] software distribution using this command:
guix import /path/to/nixpkgs/checkout nettle
The command automatically fetches and converts to Guix the “Nix
expression” of Nettle.
* Submitting Patches
Development is done using the Git distributed version control system. Thus,
access to the repository is not strictly necessary. We welcome contributions
in the form of patches as produced by git format-patch sent to
bug-guix@gnu.org. Please write commit logs in the [[http://www.gnu.org/prep/standards/html_node/Change-Logs.html#Change-Logs][GNU ChangeLog format]].
As you become a regular contributor, you may find it convenient to have write
access to the repository (see below.)
* Commit Access
For frequent contributors, having write access to the repository is
convenient. When you deem it necessary, feel free to ask for it on the
mailing list. When you get commit access, please make sure to follow the
policy below (discussions of the policy can take place on bug-guix@gnu.org.)
Non-trivial patches should always be posted to bug-guix@gnu.org (trivial
patches include fixing typos, etc.)
For patches that just add a new package, and a simple one, its OK to commit,
if youre confident (which means you successfully built it in a chroot setup,
and have done a reasonable copyright and license auditing.) Likewise for
package upgrades. We have a mailing list for commit notifications
(guix-commits@gnu.org), so people can notice. Before pushing your changes,
make sure to run git pull --rebase.
For anything else, please post to bug-guix@gnu.org and leave time for a
review, without committing anything. If you didnt receive any reply
after two weeks, and if youre confident, its OK to commit.
That last part is subject to being adjusted, allowing individuals to commit
directly on non-controversial changes on parts theyre familiar with.