Difference between pages "Forking An Ebuild" and "Programming"

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Often, a Funtoo developer needs to fork an upstream ebuild. This is necessary when we want to apply fixes to it. This page will explain the concepts of forking and how this works in the context of Funtoo.
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Programming is a skill that is helpful to contribute back to linux, gnu, and other software sources. This page is dedicated to improving our programming & scripting skills. The author of this page suggests bash, c, and python for funtoo users.  This page is a bit of a mess for the moment, it will be broken up into sub pages.  cobol is so gangster, it's stupid....
  
== Portage Tree Generation ==
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==Programming Languages==
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===Assembly Language===
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Funtoo Linux generates its Portage tree using a special script that essentially takes a Gentoo tree as its starting point, and then applies various modifications to it. The modifications involve adding packages from various overlays, including our [[Overlay:Funtoo-overlay]]. Some packages added are brand new, while other packages are our special forked versions that replace existing packages.
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===Bash===
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In the vast majority of cases, when we fork a package, we take full responsibility for all ebuilds associated with that package, meaning that we have a full copy of the <tt>sys-foo/bar</tt> directory in one of our overlays.
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===C===
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If you're interested in seeing the actual script that does all these things, take a look at the following files:
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===C++===
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; http://git.funtoo.org/funtoo-overlay/tree/funtoo/scripts/current-update.sh: cronned script that calls <tt>merge.py</tt>.
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==== Qt Framework ====
;http://git.funtoo.org/funtoo-overlay/tree/funtoo/scripts/merge.py: python script that does the heavy lifting of combining Gentoo tree with various overlays, including our flora and funtoo-overlay. When we want to change what overlays we merge, what packages we exclude as a matter of policy (such as stale packages in some overlays), we make changes to this file.
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; http://git.funtoo.org/funtoo-overlay/tree/funtoo/scripts/merge_utils.py: python module that contains classes and methods that implement the merging functionality.
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== Forking an Ebuild ==
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===Cobol===
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In general, we fork ebuilds from Gentoo that we want to modify in some way. Before you fork an ebuild, it's important to understand that in general we fork entire packages, not just a single ebuild. This means that if you want to make some changes to <tt>sys-foo/bar</tt>, you are going to fork all <tt>sys-foo/bar</tt> ebuilds, and then Funtoo will be responsible for continuing to maintain these ebuilds until the package is unforked. Here are the steps we would use to fork <tt>sys-foo/bar</tt>:
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===Fortran===
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# Find <tt>sys-foo/bar</tt> in you regular Portage tree. Make sure you have run <tt>emerge --sync</tt> recently to ensure it is up-to-date. If you want to fork from very recent changes that are not yet in our tree, you may need to grab the most recent Gentoo Portage tree to serve as your source for <tt>sys-foo/bar</tt> (this typically isn't necessary.)
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===java===
# Copy the <tt>sys-foo/bar</tt> directory in its entirety to <tt>funtoo-overlay/sys-foo/bar</tt>.
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# Make any necessary modifications to <tt>funtoo-overlay/sys-foo/bar</tt>.
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# Perform some funtoo-ification steps prior to commit.
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# Add and commit the changes to funtoo-overlay.
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# Push changes to funtoo-overlay.
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At this point, the forked <tt>sys-foo/bar</tt> package will be part of funtoo-overlay. The next time our unified Portage tree is generated by <tt>merge.py</tt> (the one that users have in their <tt>/usr/portage</tt> and is updated via <tt>emerge --sync</tt>), your forked ebuild will be used in place of the Gentoo ebuild. Why is this? It is because our <tt>merge.py</tt> script has been defined with a policy that any ebuilds in funtoo-overlay will replace any existing Gentoo ebuilds if they exist. The mechanism of replacement is that our <tt>sys-foo/bar</tt> directory will be used in place of Gentoo's <tt>sys-foo/bar</tt> directory. So this is how the forking process works.
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===lua===
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== Funtoo-ification ==
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===ObjectiveC===
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{{#widget:YouTube|playlist=PL54515103C712A53D}}
  
When we fork a package from Gentoo, we perform the following tweaks to the package directory before committing:
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===Perl===
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# Removal of <tt>ChangeLog</tt>.
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===Python===
# Run <tt>ebuild foo-1.0.ebuild digest</tt> before committing. This will cause the <tt>Manifest</tt> file to be regenerated. Gentoo has a lot more entries in this file than we do, since we use mini-Manfiests that only include DIST listings (for distfiles only.) We want to commit our mini-Manifest (still called <tt>Manifest</tt>, just with less entries in it) rather than the one that came from Gentoo.
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# Edit the top of each ebuild, and remove all <tt>Copyright</tt> and <tt>$Header:</tt> lines at the top of the file. We have a LICENSE.txt and COPYRIGHT.txt file in the root of our Portage tree, which is easier to maintain than keeping all the years up-to-date in each ebuild. Also, the <tt>$Header:</tt> line is there for the CVS version control system in Gentoo which Funtoo does not use. ''The only comment that should remain on the top of the ebuild is the one stating that it is distributed under the GPLv2.''.
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<console>
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===Ruby===
# If you find yourself doing this often, place this function in your .bashrc, .zshrc, etc
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{{#widget:YouTube|playlist=PL1512BD72E7C9FFCA}}
funtooize() {
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    if [ -z "$1" ]; then
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        search_path='.'
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    else
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        search_path=$1
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    fi
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    find $search_path -type f -exec sed -i -e '/^# Copyright\|^# \$Header/d' {} +
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===Tex===
    find $search_path -type f -name "ChangeLog*" -delete
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{{#widget:YouTube|playlist=PLlLAyGJ7_7MFcSTHMVMErZ1GW0pGOfWtd}}
    find $search_path -type f -name '*.ebuild' -exec ebuild {} manifest \;
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}
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</console>
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Here are a few additional changes that you are allowed to make to any forked ebuilds:
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== External Resources ==
 
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https://en.wikipedia.org/wiki/List_of_programming_languages
# Line length greater than 80 characters. Gentoo enforces an 80-character line length limit. We don't.
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# <tt>KEYWORDS</tt> of <tt>*</tt> and <tt>~*</tt>. Gentoo does not allow these shortcuts. We do. They allow you to say "all arches" and "all unstable arches" in a concise way. Gentoo doesn't allow these shortcuts because it's Gentoo's policy to have each arch team manually approve each package. We do not have this policy so we can use the shortcuts.
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# Use of <tt>4-python</tt> EAPI. We allow the use of this EAPI for enhanced python functionality.
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[[Category:Development]]
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Revision as of 19:52, October 20, 2014

Programming is a skill that is helpful to contribute back to linux, gnu, and other software sources. This page is dedicated to improving our programming & scripting skills. The author of this page suggests bash, c, and python for funtoo users. This page is a bit of a mess for the moment, it will be broken up into sub pages. cobol is so gangster, it's stupid....

Programming Languages

Assembly Language

Bash

C

C++

Qt Framework

Cobol

Fortran

java

lua

ObjectiveC

Perl

Python

Ruby

Tex

External Resources

https://en.wikipedia.org/wiki/List_of_programming_languages