Difference between revisions of "Creating Your Own Overlay"

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This page intends to get your local overlay going.
More involved developers may want to consider contributing to Funtoo Linux by maintaining an independent ''overlay''.  
==Using overlay with Funtoo's kits system==
 
For the overlays we will use a minor change for the main meta-repo described in Funtoo kits: https://github.com/funtoo/meta-repo/blob/master/README.rst
Traditionally, an overlay is a Portage repository that can be added dynamically to a user's system to augment the available ebuilds and [[Catpkg|catpkgs]]. However, with Funtoo it is also possible for our automated scripts to merge your overlay, or parts of it, into Funtoo Linux itself. If you are maintaining quite a few ebuilds, this lets us "pull" from your independently-maintained overlay so that you don't need to submit lots of pull requests via https://code.funtoo.org. So it can be a very serious time savings for developers who are more advanced.
 
==Creating Your Overlay ==
 
There are two ways to create an overlay that we'll cover. The first is to simply create a local overlay as follows (courtesy seemant, thanks!)
===Creating a Local Overlay===
roughly speaking:
# create an overlay directory (.e.g /home/USER/overlay or wherever)
# add two dirs: profiles and metadata
# in the profiles dir, put a file called repo_name and put a name in there like "MYOVERLAY"
# in the metadata dir you need a file called layout.conf (see below)
# create a file in /etc/portage/repos.conf called local-overlay and populate with data (see below)


{{console|body=
{{console|body=
###i## install -d /var/git
$##i## mkdir $HOME/overlay
###i## cd /var/git
$##i## mkdir $HOME/overlay/profiles
###i## git clone https://github.com/funtoo/meta-repo.git
$##i## mkdir $HOME/overlay/metadata
###i## cd meta-repo
$##i## echo "myoverlay" > $HOME/overlay/profiles/repo_name
###i## git submodule init
}}
###i## git submodule update
 
###i## rm /usr/share/portage/config/repos.conf
{{file|name=/home/USER/overlay/metadata/layout.conf|lang=|desc=|body=
thin-manifests = true
sign-manifests = false
profile-formats = portage-2
cache-formats = md5-dict
masters = core-kit
manifest-hashes = SHA512
}}
 
{{file|name=/etc/portage/repos.conf/local-overlay|lang=|desc=|body=
[myoverlay]
location = /home/USER/overlay
auto-sync = no
priority = 10
}}
}}
Notice that by default guide entire /etc/portage/repos.conf is a symlink to <code>/var/git/meta-repo/repos.conf</code>. This will not let using custom repositories (overlays). For that we will setup a flat file symlink, called <code>funtoo</code> (just an example name).
The ''myoverlay'' in the above needs replacing if you chose a different overlay name.
 
then to manipulate an ebuild to a new revision for example glibc
{{console|body=
{{console|body=
###i## rm -rf /etc/portage/repos.conf
$##i## cd $HOME/overlay
###i## mkdir /etc/portage/repos.conf
$##i## mkdir sys-libs && cd sys-libs
###i## ln -s /var/git/meta-repo/repos.conf /etc/portage/repos.conf/funtoo
$##i## mkdir glibc && cd glibc
###i## chown -R portage:portage /var/git/meta-repo
$##i## cp /var/db/pkg/sys-libs/glibc-2.33-r2/glibc-2.33-r2.ebuild .
$##i## mv glibc-2.33-r2.ebuild glibc-2.33-r3.ebuild
###i## emerge -av glibc
}}
}}
In above shown commands we created the "funtoo" symlink to the regular portage tree. This allows to add any configuration files of any names you prefer for any custom repositories you like, such as overlays, and will not interfere with the meta-repo.


==Creating the overlay==
===Creating an online overlay===
We will use <code>/var/git/overlay</code> as primary location directory for the overlay. The location can be anywhere on your system, below is an example location tied with <code>/var/git/</code>, is where regular tree located too.
 
The second is quite simple and can be done via https://code.funtoo.org. Simply go to https://code.funtoo.org/bitbucket/projects/CO/repos/skeleton-overlay/browse and click the "Create fork" button:
 
[[File:create fork.png|480px|center]]
 
At this point, you will be presented with the next screen, where you should type in a new name for your overlay, ''disable fork syncing'', and click "Fork Repository".
 
[[File:fork_overlay2.png|480px|center]]
 
=== Making it Public ===
 
You have now created your own initial overlay, but it is not visible to the public. To make it visible to the public, go to {{c|Repository Settings}}, then {{c|Repository Permissions}} and finally check {{c|Public Access -- Allow public access to this repository}}. Your repository can now be seen (but not modified) by others.
 
=== Learning More About code.funtoo.org ===
 
To learn more about code.funtoo.org, please see the following video. We will still need to perform some finishing steps to get the overlay ready for use, which we will cover below.
 
{{#evt:service=youtube|id=https://youtu.be/V6PfB64oMWo|dimensions=480|alignment=center|autoresize=true}}
 
 
=== Cloning and Finishing Touches ===
 
{{note|you may change every "my-overlay" to your personal repositories name}}
 
You will now want to add a ssh key to code.funtoo.org (see video above for more information.) Then, clone it locally, and perform the following steps to properly set the overlay name:


{{console|body=
{{console|body=
###i## mkdir /var/git/overlay
$ ##i##git clone ssh://git@code.funtoo.org:7999/~drobbins/my-overlay.git
Cloning into 'my-overlay'...
remote: Enumerating objects: 16, done.
remote: Counting objects: 100% (16/16), done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 16 (delta 4), reused 0 (delta 0)
Receiving objects: 100% (16/16), 8.64 KiB {{!}} 8.64 MiB/s, done.
Resolving deltas: 100% (4/4), done.
$ ##i##cd my-overlay
$ ##i##echo "my-overlay" > profiles/repo_name
$ ##i##sed -i 's/skeleton/my-overlay/' metadata/layout.conf
$ ##i##git add .
$ ##i##git commit -a -m "Setting initial repo name."
$ ##i##git push
}}
}}
{{important|Do not store your overlay inside of /var/git/meta-repo. If you do it will get erased when you run ego sync.}}


Clone the [https://github.com/funtoo/skeleton-overlay skeleton overlay] from github. Change the repository's name from ''skeleton'' to a name as it will appear when emerging. Here we use <code>myoverlayname</code> as an example, choose your name accordingly.
{{Tip|Now is also a good time to review the {{c|README.rst}} and {{c|LICENSE.txt}} and customize as needed.}}


{{console|body=###i## cd /var/git/overlay
Now, your overlay is ready for new ebuilds to be committed to it. But before we do that, we should configure Portage to "see" your overlay and any packages it contains.
###i## git clone  https://github.com/funtoo/skeleton-overlay.git
###i## mv skeleton-overlay myoverlayname
}}


==Configure the overlay==
=== Create repos.conf Entry ===
We will enable portage settings required for the overlay to be functional.
{{console|body=
###i## echo "myoverlayname" > /var/git/overlay/myoverlayname/profiles/repo_name
###i## echo "masters = core-kit" >> /var/git/overlay/myoverlayname/metadata/layout.conf}}


{{file|name=/etc/portage/repos.conf/myoverlayname.conf|lang=|desc=Add your overlay to portage|body=
Create the following file in order to register your overlay with Portage:
[DEFAULT]
main-repo = core-kit


[myoverlayname]
{{file|name=/etc/portage/repos.conf/my-overlay.conf|lang=|desc=Add your overlay to portage|body=
location = /var/git/overlay/myoverlayname
[my-overlay]
location = /home/myuser/my-overlay
auto-sync = no
auto-sync = no
priority = 10
priority = 10
}}
}}


{{tip|The <code>priority</code> key is needed to ensure, that your overlay has higher priority to the kit's overlays, which are default priority 1}}
{{tip|The {{c|priority}} key is needed to ensure that your overlay has higher priority to the kit's overlays, which are default priority 1.}}
 
Now, you are ready to add new ebuilds that are not present in portage tree or fix the ebuilds from portage tree you are not satisfied with, updating old packages or removing newer package versions.
 
For example, to create an updated version of the package {{c|net-misc/autossh}} not currently in the repository, create the directory tree {{f|net-misc/autossh}} under {{c|my-overlay}}. In the {{f|autossh}} directory you created, you can add new {{c|autossh-x.y.z.ebuild}} files.


This would be starting point for your own overlay. You're ready to add new ebuilds that are not present in portage tree or fix the ebuilds from portage tree you are no satisfied with, updating of old versions or removing of new ebuild versions.
==back to [[Development_Guide]]==


[[Category:Portage]]
[[Category:Portage]]
[[Category:Official Documentation]]

Latest revision as of 17:59, December 22, 2023

More involved developers may want to consider contributing to Funtoo Linux by maintaining an independent overlay.

Traditionally, an overlay is a Portage repository that can be added dynamically to a user's system to augment the available ebuilds and catpkgs. However, with Funtoo it is also possible for our automated scripts to merge your overlay, or parts of it, into Funtoo Linux itself. If you are maintaining quite a few ebuilds, this lets us "pull" from your independently-maintained overlay so that you don't need to submit lots of pull requests via https://code.funtoo.org. So it can be a very serious time savings for developers who are more advanced.

Creating Your Overlay

There are two ways to create an overlay that we'll cover. The first is to simply create a local overlay as follows (courtesy seemant, thanks!)

Creating a Local Overlay

roughly speaking:

  1. create an overlay directory (.e.g /home/USER/overlay or wherever)
  2. add two dirs: profiles and metadata
  3. in the profiles dir, put a file called repo_name and put a name in there like "MYOVERLAY"
  4. in the metadata dir you need a file called layout.conf (see below)
  5. create a file in /etc/portage/repos.conf called local-overlay and populate with data (see below)
user $ mkdir $HOME/overlay
user $ mkdir $HOME/overlay/profiles
user $ mkdir $HOME/overlay/metadata
user $ echo "myoverlay" > $HOME/overlay/profiles/repo_name
   /home/USER/overlay/metadata/layout.conf
thin-manifests = true
sign-manifests = false
profile-formats = portage-2
cache-formats = md5-dict
masters = core-kit
manifest-hashes = SHA512
   /etc/portage/repos.conf/local-overlay
[myoverlay]
location = /home/USER/overlay
auto-sync = no
priority = 10

The myoverlay in the above needs replacing if you chose a different overlay name.

then to manipulate an ebuild to a new revision for example glibc

user $ cd $HOME/overlay
user $ mkdir sys-libs && cd sys-libs
user $ mkdir glibc && cd glibc
user $ cp /var/db/pkg/sys-libs/glibc-2.33-r2/glibc-2.33-r2.ebuild .
user $ mv glibc-2.33-r2.ebuild glibc-2.33-r3.ebuild
root # emerge -av glibc

Creating an online overlay

The second is quite simple and can be done via https://code.funtoo.org. Simply go to https://code.funtoo.org/bitbucket/projects/CO/repos/skeleton-overlay/browse and click the "Create fork" button:

Create fork.png

At this point, you will be presented with the next screen, where you should type in a new name for your overlay, disable fork syncing, and click "Fork Repository".

Fork overlay2.png

Making it Public

You have now created your own initial overlay, but it is not visible to the public. To make it visible to the public, go to Repository Settings, then Repository Permissions and finally check Public Access -- Allow public access to this repository. Your repository can now be seen (but not modified) by others.

Learning More About code.funtoo.org

To learn more about code.funtoo.org, please see the following video. We will still need to perform some finishing steps to get the overlay ready for use, which we will cover below.


Cloning and Finishing Touches

   Note

you may change every "my-overlay" to your personal repositories name

You will now want to add a ssh key to code.funtoo.org (see video above for more information.) Then, clone it locally, and perform the following steps to properly set the overlay name:

user $ git clone ssh://git@code.funtoo.org:7999/~drobbins/my-overlay.git
Cloning into 'my-overlay'...
remote: Enumerating objects: 16, done.
remote: Counting objects: 100% (16/16), done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 16 (delta 4), reused 0 (delta 0)
Receiving objects: 100% (16/16), 8.64 KiB | 8.64 MiB/s, done.
Resolving deltas: 100% (4/4), done.
user $ cd my-overlay
user $ echo "my-overlay" > profiles/repo_name
user $ sed -i 's/skeleton/my-overlay/' metadata/layout.conf
user $ git add .
user $ git commit -a -m "Setting initial repo name."
user $ git push
   Tip

Now is also a good time to review the README.rst and LICENSE.txt and customize as needed.

Now, your overlay is ready for new ebuilds to be committed to it. But before we do that, we should configure Portage to "see" your overlay and any packages it contains.

Create repos.conf Entry

Create the following file in order to register your overlay with Portage:

   /etc/portage/repos.conf/my-overlay.conf - Add your overlay to portage
[my-overlay]
location = /home/myuser/my-overlay
auto-sync = no
priority = 10
   Tip

The priority key is needed to ensure that your overlay has higher priority to the kit's overlays, which are default priority 1.

Now, you are ready to add new ebuilds that are not present in portage tree or fix the ebuilds from portage tree you are not satisfied with, updating old packages or removing newer package versions.

For example, to create an updated version of the package net-misc/autossh not currently in the repository, create the directory tree net-misc/autossh under my-overlay. In the autossh directory you created, you can add new autossh-x.y.z.ebuild files.

back to Development_Guide