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3. Mixing Software Branches

Content:

3.a. Using One Branch

The Stable Branch

The ACCEPT_KEYWORDS variable defines what software branch you use on your system. It defaults to the stable software branch for your architecture, for instance x86.

We recommend that you only use the stable branch. However, if you don't care about stability this much and you want to help out Gentoo by submitting bugreports to http://bugs.gentoo.org, read on.

The Testing Branch

If you want to use more recent software, you can consider using the testing branch instead. To have Portage use the testing branch, add a ~ in front of your architecture.

The testing branch is exactly what it says - Testing. If a package is in testing, it means that the developers feel that it is functional but has not been thoroughly tested. You could very well be the first to discover a bug in the package in which case you could file a bugreport to let the developers know about it.

Beware though, you might notice stability issues, imperfect package handling (for instance wrong/missing dependencies), too frequent updates (resulting in lots of building) or broken packages. If you do not know how Gentoo works and how to solve problems, we recommend that you stick with the stable and tested branch.

For example, to select the testing branch for the x86 architecture, edit /etc/portage/make.conf and set:

Code Listing 1.1: Setting the ACCEPT_KEYWORDS variable

ACCEPT_KEYWORDS="~x86"

If you update your system now, you will find out that lots of packages will be updated. Mind you though: when you have updated your system to use the testing branch there is usually no easy way back to the stable, official branch (except for using backups of course).

3.b. Mixing Stable with Testing

The package.accept_keywords location

You can ask Portage to allow the testing branch for particular packages but use the stable branch for the rest of the system. To achieve this, add the package category and name you want to use the testing branch of in /etc/portage/package.accept_keywords. You can also create a directory (with the same name) and list the package in the files under that directory. For instance, to use the testing branch for gnumeric:

Code Listing 2.1: /etc/portage/package.accept_keywords setting for gnumeric

app-office/gnumeric

Test Particular Versions

If you want to use a specific software version from the testing branch but you don't want Portage to use the testing branch for subsequent versions, you can add in the version in the package.accept_keywords location. In this case you must use the = operator. You can also enter a version range using the <=, <, > or >= operators.

In any case, if you add version information, you must use an operator. If you leave out version information, you cannot use an operator.

In the following example we ask Portage to accept gnumeric-1.2.13:

Code Listing 2.2: Enabling a particular gnumeric test version

=app-office/gnumeric-1.2.13

3.c. Using Masked Packages

The package.unmask location

Important: The Gentoo developers do not support the use of this location. Please exercise due caution when doing so. Support requests related to package.unmask and/or package.mask will not be answered. You have been warned.

When a package has been masked by the Gentoo developers and you still want to use it despite the reason mentioned in the package.mask file (situated in /usr/portage/profiles by default), add the desired version (usually this will be the exact same line from profiles) in the /etc/portage/package.unmask file (or in a file in that directory if it is a directory).

For instance, if =net-mail/hotwayd-0.8 is masked, you can unmask it by adding the exact same line in the package.unmask location:

Code Listing 3.1: /etc/portage/package.unmask

=net-mail/hotwayd-0.8

Note: If an entry in /usr/portage/profiles/package.mask contains a range of package versions, you will need to unmask only the version(s) you actually want. Please read the previous section to learn how to specify versions in package.unmask.

The package.mask location

When you don't want Portage to take a certain package or a specific version of a package into account you can mask it yourself by adding an appropriate line to the /etc/portage/package.mask location (either in that file or in a file in this directory).

For instance, if you don't want Portage to install newer kernel sources than gentoo-sources-2.6.8.1, you add the following line at the package.mask location:

Code Listing 3.2: /etc/portage/package.mask example

>sys-kernel/gentoo-sources-2.6.8.1

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Page updated July 24, 2012

Summary: Gentoo provides software separated in several branches, depending on stability and architectural support. "Mixing Software Branches" inform you how these branches can be configured and how you can override this separation individually.

Sven Vermeulen
Author

Roy Marples
Author

Daniel Robbins
Author

Chris Houser
Author

Jerry Alexandratos
Author

Seemant Kulleen
Gentoo x86 Developer

Tavis Ormandy
Gentoo Alpha Developer

Jason Huebel
Gentoo AMD64 Developer

Guy Martin
Gentoo HPPA developer

Pieter Van den Abeele
Gentoo PPC developer

Joe Kallar
Gentoo SPARC developer

John P. Davis
Editor

Pierre-Henri Jondot
Editor

Eric Stockbridge
Editor

Rajiv Manglani
Editor

Jungmin Seo
Editor

Stoyan Zhekov
Editor

Jared Hudson
Editor

Colin Morey
Editor

Jorge Paulo
Editor

Carl Anderson
Editor

Jon Portnoy
Editor

Zack Gilburd
Editor

Jack Morgan
Editor

Benny Chuang
Editor

Erwin
Editor

Joshua Kinard
Editor

Tobias Scherbaum
Editor

Lars Weiler
Editor

Jochen Maes
Editor

Grant Goodyear
Reviewer

Gerald J. Normandin Jr.
Reviewer

Donnie Berkholz
Reviewer

Ken Nowack
Reviewer

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