WIP: silence build warnings

[findutils/ericb.git] / README-hacking

These notes intend to help people working on the checked-out sources.
They don't apply when you are building from a distribution tarball.

If you want to submit a patch, please start from checked-out sources
rather than the source tarball.


Prerequisites
=============

 * git (to check out both findutils and gnulib).
 * A C compiler, linker and software development libraries (the standard
   C library).  Any compiler compliant with the 1990 ICO C standard running
   on a POSIX system should work.
 * GNU Autoconf
 * GNU Automake
 * GNU m4
 * GNU gettext
 * GNU Dejagnu

The configure program should tell you if you try to use a version of
one of these tools which is not oif a recent enough version.  The file
tool-versions.txt indicates which version of each tool the current
release was built and tested with.


Use the latest upstream sources
===============================

1. Check out the findutils code

  git clone git://git.sv.gnu.org/findutils

This will download the whole repository, it's about 14MB.  If you
already have a copy you can refresh it with

  git checkout master  (to switch to your copy of the master branch)
  git pull (to collect and merge changes)

2. Generate a gnulib installation within the findutils source tree

 Change your working directory to the findutils source directory (that
 is, the directory containing this file).   Then run the following
 command:-

    sh import-gnulib.sh

 This command will use git to check out the version of gnulib which is
 intended to work with the findutils source you already have, as
 configured by the file import-gnulib.config.  The gnulib code itself
 is left in the directory "gnulib-git".  The "gnulib" directory
 contains just the gnulib files that findutils needs during the build
 process.

 If you want to build findutils with a different version of gnulib,
 just edit import-gnulib.config to change the version and then re-run
 import-gnulib.sh.  When specifying the version, you can specify
 either the date or a tag.  If making any kind of release, please
 use a fully identifying version (rather than just, say, "HEAD").

 The import-gnulib.sh script will also run Autoconf and Automake to
 generate the "configure" script and "Makefile.in" files.  Should you
 need to do this manually, you can do it like this :-

    aclocal -I m4 -I gnulib/m4     && \
    autoheader                     && \
    autoconf                       && \
    automake --add-missing --copy

3. (Optional) Update the translations

    rsync -Lrtvz  translationproject.org::tp/latest/findutils/ po

3. Run "configure" and "make" in the normal way.

 If you have GNU libintl installed, you can just run "configure".
 Otherwise, run "configure --disable-nls".

You are now at the point where your local directory looks just like it
would after building a source release, except that your copy is more
up-to-date.

*Before* you commit changes
===========================

In this project, we much prefer patches that automatically record
authorship.  That is important not just to give credit where due, but
also from a legal standpoint (see below).  To create author-annotated
patches with git, you must first tell git who you are.  That information
is best recorded in your ~/.gitconfig file.  Edit that file, creating
it if needed, and put your name and email address in place of these
example values:

[user]
  name = Joe X. User
  email = joe.user@example.com


In order to simplify the handling of merges, we recommend that you
use a specialised merge driver for the ChangeLog file.  Otherwise,
you will end up spending time resolving merge conflicts for your
ChangeLog edits.  You can install the ChangeLog merge driver by
following the instructions in the README section of the file
gnulib-git/gnulib/lib/git-merge-changelog.c.



Making commits locally
======================

You will normally find it much easier to work on a branch.  This
allows you to maintain your changes and test them without being
affected by changes on the trunk.

To Make a "topic" branch for your change, do this:

  git branch my-topic
  git checkout my-topic

You can then work on your branch as normal.

To update your local repository, do this:

  git checkout master
  git pull

Then, rebase your topic branch to take into account the upstream
changes you just pulled:

  git checkout my-topic
  git rebase master

There are some useful checks that git commit hooks will do for you,
it's a good idea to enable these:

  chmod +x .git/hooks/pre-commit


Submitting patches
==================

If you plan to submit changes to findutils, please make sure you have
read the GNU coding standard (http://www.gnu.org/prep/standards/).
Some common things you might have forgotten to do are:

 - document your change in both the manual pages and the Texinfo file
 - re-run the test suite (with Dejagnu installed!)
 - add a ChangeLog entry (for now we still do that manually)
 - add a test case for the bug you're fixing or feature you're adding
 - mention your fix or change (if it's significant) in the NEWS file

If you have patches, please generate them with "git format-patch" and
mail them to these addresses:

  bug-findutils@gnu.org, findutils-patches@gnu.org

Here is a complete session

  # set up your topic branch
  git checkout master
  git pull
  git branch my-topic
  git checkout my-topic

  # update the code, documentation, test suite and change log, run tests
  emacs xargs/xargs.c
  emacs doc/find.texi xargs/xargs.1
  emacs xargs/testsuite/Makefile.am  xargs/testsuite/xargs.gnu/blah.exp
  make check
  emacs ChangeLog NEWS

  # make sure you didn't break anything
  make distcheck

  # commit the change and send the patches.
  git add -u
  git commit
  git rebase master
  mkdir /tmp/patches
  git format-patch -o /tmp/patches master..HEAD
  git send-email --compose \
      --to bug-findutils@gnu.org \
      --cc findutils-patches@gnu.org /tmp/patches


Copyright assignment
====================

If your change is significant (i.e., if it adds more than ~10 lines),
then you'll have to have a copyright assignment on file with the FSF.
Since that involves first an email exchange between you and the FSF,
and then the exchange (FSF to you, then back) of an actual sheet of paper
with your signature on it, and finally, some administrative processing
in Boston, the process can take a few weeks.

The forms to choose from are in gnulib's doc/Copyright/ directory.
If you want to assign a single change, you should use the file,
doc/Copyright/request-assign.changes:

    http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=blob;f=doc/Copyright/request-assign.changes;hb=HEAD

If you would like to assign past and future contributions to a project,
you'd use doc/Copyright/request-assign.future:

    http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=blob;f=doc/Copyright/request-assign.future;hb=HEAD

You may make assignments for up to four projects at a time.

In case you're wondering why we bother with all of this, read this:

    http://www.gnu.org/licenses/why-assign.html


========================================================================
Copyright (C) 2009, 2010 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts.  A copy of the license is included in the ``GNU Free
Documentation License'' file as part of this distribution.