How to compile a custom package in Arch Linux

Here’s the first entry on a series on how to build custom packages in Arch Linux. This will take you through clear examples from creating your own PKGBUILD files adding your customs to packages from the official repositories and publishing it to Arch User Repository (AUR) of packages.

The root of my problem

With the release of the version 20.04.0 of the KDE Applications I found an incompatibility bug between Konsole, the terminal emulator and Yakuake - the drop-down terminal based on Konsole - as Yakuake cannot override the switch-to-tab-%i shortcuts (Alt+1, Alt+2, ...) defined in the Konsole app.

First actions

The trivial solution: downgrade Konsole to 19.12.3 using the local cache.



sudo pacman -U /var/cache/pacman/pkg/konsole-19.12.3-1-x86_64.pkg.tar.zst

But, what kind of fix is this? 🤨 Not entirely happy with it, I started searching or any reported bug in the KDE issues, I was sure someone already had complained about it since it's a common feature used on a daily basis. Well, it seemed like the bug didn't get enough attention.

So, here I am...

Since Arch Linux is a rolling release OS it wants to upgrade «all the things», yet, this conflicted with my desire of having Yakuake key binding working on my laptop. I knew I could add the Konsole package to the IgnorePkg config in /etc/pacman.conf, but I was hoping that a patch came to me at any moment.

I'm a developer!

Yeah, as a developer I knew that I can remove that new code that defines default shortcuts for switch-to-tab-%i in the Konsole source code. I got the power to use the Ctrl+F to find that evil line of code and remove it!

Download the build information

I downloaded for the PKGBUILD file for the official Konsole package, and I changed this:

Removed the validpgpkeys variable.
Removed the {,.sig} from source.
Set sha256sums=('SKIP') because I will edit the source code.

So, this is your PKGBUILD file:



pkgname=konsole
pkgver=20.04.0
pkgrel=1
arch=(x86_64)
url='https://kde.org/applications/system/konsole/'
pkgdesc="KDE's terminal emulator"
license=(GPL LGPL FDL)
groups=(kde-applications kdebase)
depends=(knotifyconfig kpty kparts kinit knewstuff)
makedepends=(extra-cmake-modules kdoctools)
optdepends=('keditbookmarks: to manage bookmarks')
source=("https://download.kde.org/stable/release-service/$pkgver/src/$pkgname-$pkgver.tar.xz")
sha256sums=('SKIP')

prepare() {
  mkdir -p build
}

build() {
  cd build
  cmake ../$pkgname-$pkgver \
    -DBUILD_TESTING=OFF
  make
}

package() {
  cd build
  make DESTDIR="$pkgdir" install
}

Edit the source code

The makepkg command is used to build packages, and you can download the app's source code, defined in the source variable, using:



makepkg --source

I opened the source code in a text editor and looked for the name of the shortcut: Switch to Tab. I found the default key binding in a file named src/ViewManager.cpp and after editing it, I replaced the file into the original konsole-20.04.0.tar.xz file.

Compile your package

The compilation is really easy, just run:



makepkg -s

Based on your config on /etc/makepkg.conf your custom Konsole package is named konsole-20.04.0-1-x86_64.pkg.tar.zst or (the old extension) konsole-20.04.0-1-x86_64.pkg.tar.xz.

The PKGBUILD has a makedepends variable and these dependencies are required to compile the package's code, not to use the app itself. After the build is done, you can clean orphan packages using:



sudo pacman -Rns $(pacman -Qtdq)

Installation

Don't worry, you can always rollback using your local cache! Now, you can install it:



sudo pacman -U konsole-20.04.0-1-x86_64.pkg.tar.zst

or If you want to compile and install in one command:



makepkg -si

And it's done! You have your home made Archlinux package!

What's next?

In the next post we'll use the patch command to apply changes in the code during the package compilation.

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