HOWTO Install Deltup

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Contents

[edit] Introduction

Deltup is a program that allows you to fetch the changes to a program, instead of the entire tarball. In other words if you already have cool-app-1.0.tar.bz and a new version is released, instead of having to download cool-app-1.1.tar.bz you would only have to download the minor differences between the two ( aka patch ). This howto is an absolute must for dialup users.

[edit] Installation

Code: Installation 
# echo "app-portage/deltup ~x86" >> /etc/portage/package.keywords
# echo "dev-util/bdelta ~x86" >> /etc/portage/package.keywords
# echo "app-portage/getdelta ~x86" >> /etc/portage/package.keywords
# emerge getdelta

If you are on athlon64, then replace ~x86 with ~amd64.

[edit] Configuration

To enable getdelta, you have to edit your /etc/make.conf:

File: /etc/make.conf

... 

FETCHCOMMAND="/usr/bin/getdelta.sh \${URI}"

Tuning of the script may be accomplished by editing /etc/deltup/getdelta.rc

[edit] What if digest verification fails?

Due to the on-the-fly-generation of the package-files the digest verification may fail. If you are sure that the package has been downloaded correctly, you can run 

ebuild /path/to/ebuild digest

to re-digest the file and try to emerge the package.

Warning: This is strongly not recommended! Try first update deltup and bdelta before to do this
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