path: root/carbslinux.org

#+TITLE: Carbs Linux User Manual
#+AUTHOR: Cem Keylan
#+TEXINFO_FILENAME: carbslinux.info
#+TEXINFO_DIR_CATEGORY: System Administration
#+TEXINFO_DIR_TITLE: Carbs Linux: (carbslinux)
#+TEXINFO_DIR_DESC: Carbs Linux User Manual
#+OPTIONS: html-postamble:nil html-scripts:nil

#+BEGIN_COMMENT
This is the documentation source for Carbs Linux in Org-mode. The macros below
are used for assigning IDs to contribution guidelines.
#+END_COMMENT
#+MACRO: contid [@@texinfo:@anchor{$1}@@$1]
#+MACRO: sectid $2 [@@texinfo:@anchor{$1}@@$1]

This is the full documentation of [[https://carbslinux.org][Carbs Linux]], from the details of the
distribution, installation, to the package manager. It is not yet complete.

* Table of Contents                                       :toc_3_gh:noexport:
- [[#copying][Copying]]
- [[#installation][Installation]]
  - [[#preparing-environment][Preparing Environment]]
    - [[#download][Download]]
    - [[#signature-verification][Signature verification]]
    - [[#extracting-the-tarball][Extracting the tarball]]
    - [[#obtain-the-chroot-helper][Obtain the chroot helper]]
  - [[#chroot][Chroot]]
    - [[#setting-up-repositories][Setting up repositories]]
    - [[#updating-packages][Updating packages]]
    - [[#installing-packages][Installing packages]]
    - [[#essential-software][Essential Software]]
    - [[#obtaining-the-documentation][Obtaining the documentation]]
  - [[#system-configuration][System Configuration]]
    - [[#configuring-hostname][Configuring hostname]]
    - [[#hosts-file][Hosts file]]
  - [[#kernel][Kernel]]
    - [[#obtaining-the-kernel-sources][Obtaining the kernel sources]]
    - [[#kernel-dependencies][Kernel dependencies]]
    - [[#building-the-kernel][Building the kernel]]
  - [[#making-your-system-bootable][Making your system bootable]]
    - [[#bootloader][Bootloader]]
    - [[#init-scripts][Init scripts]]
    - [[#fstab][Fstab]]
  - [[#post-installation][Post-installation]]
    - [[#kiss-repositories][KISS repositories]]
- [[#init-system][Init System]]
  - [[#configuring-init][Configuring Init]]
    - [[#kernel-command-line][Kernel Command Line]]
    - [[#etcinitrcconf-file][=/etc/init/rc.conf= file]]
    - [[#init-hooks][Init Hooks]]
  - [[#changing-init-program][Changing Init Program]]
    - [[#rebooting-after-changing-init][Rebooting after changing init]]
- [[#contribution-guidelines][Contribution Guidelines]]
  - [[#conventions][Conventions]]
    - [[#shell-conventions][Shell Conventions]]
    - [[#repository-conventions][Repository Conventions]]
- [[#gnu-free-documentation-license][GNU Free Documentation License]]

* Copying
  :PROPERTIES:
  :COPYING:  t
  :END:

Copyright \copy 2020 Cem Keylan

#+BEGIN_QUOTE
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU Free
Documentation License."
#+END_QUOTE

* Installation
:PROPERTIES:
:DESCRIPTION: Installing Carbs Linux
:END:

These are the step-by-step instructions for installing Carbs Linux.

** Preparing Environment
:PROPERTIES:
:DESCRIPTION: Getting ready to chroot
:END:

To install Carbs Linux, you will need a Live Linux ISO. For that purpose, you
can obtain a Gentoo or Void Linux live image. You can follow their instructions
to boot and setup your network.

You will need the following programs in order to install Carbs Linux:

- tar
- wget
- xz
- some form of base utilities (coreutils, sbase, busybox, etc.)

Rest of these instructions will assume that you have set all of these up, and
will continue on that point.

*** Download
:PROPERTIES:
:DESCRIPTION: Download the root filesystem tarball
:END:

First, we need to download the rootfs tarball. You can do the following in order
to obtain the rootfs. If you are using an i686 machine, replace the =x86_64=
with =i686=. We are setting this in a URL variable so that we don't have to
write it every time.

#+BEGIN_EXAMPLE sh
  $ wget $URL/carbs-rootfs.tar.xz.sha256
  $ sha256sum -c carbs-rootfs.tar.xz.sha256
#+END_EXAMPLE

*** Signature verification
:PROPERTIES:
:DESCRIPTION: Verify the signature of the rootfs tarball
:END:

It is highly recommended to verify the signature of the tarball. You will need
GPG for this.

#+BEGIN_EXAMPLE
  $ wget $URL/carbs-rootfs.tar.xz.sig
  $ gpg --recv-keys FF484BDFEFCEF8FF
  $ gpg --verify carbs-rootfs.tar.xz.sig
#+END_EXAMPLE

*** Extracting the tarball
:PROPERTIES:
:DESCRIPTION: Extracting the root filesystem to the desired location
:END:

You will need to extract the tarball to your desired location. For partitioning,
you can follow [[https://wiki.archlinux.org/index.php/Partitioning][this guide]]. This will assume that you will be mounting your root
partition to =/mnt=.

#+BEGIN_EXAMPLE
  $ mount /dev/sdx1 /mnt
  $ tar xf carbs-rootfs.tar.xz -C /mnt
#+END_EXAMPLE

*** Obtain the chroot helper
:PROPERTIES:
:DESCRIPTION: Download the script to easily chroot into the new filesystem
:END:

You can obtain the =cpt-chroot= script in order to do a simple chroot into your
new root filesystem.

#+BEGIN_EXAMPLE
  $ wget https://dl.carbslinux.org/distfiles/cpt-chroot
  $ chmod a+x cpt-chroot
#+END_EXAMPLE

** Chroot
:PROPERTIES:
:DESCRIPTION: Going inside your new system
:END:

Chroot into Carbs Linux!

#+BEGIN_EXAMPLE
  $ ./cpt-chroot /mnt
#+END_EXAMPLE

*** Setting up repositories
:PROPERTIES:
:DESCRIPTION: Basic setup for obtaining repositories
:END:

Newest tarballs do not come with repositories, so you will need to manually
obtain them, and set your =CPT_PATH= environment variable. Carbs Linux
repositories can either be obtained by =git= or =rsync=. While rsync
repositories are overall faster and smaller, git offers the whole history of the
repository and a means to manipulate your repository as you like it. If you want
to obtain the git repository, you will need to install =git= itself.

The following guide will assume that you put the repositories into =~/repos/=
directory, but you can put the repositories into any directory you want. So go
ahead and create that directory:

#+BEGIN_EXAMPLE
  $ mkdir -p $HOME/repos
#+END_EXAMPLE

**** Obtaining from git

Carbs Linux git repositories can be found both from the main server and GitHub
(mirror). Here are both their repository links. You can clone any of them.

- git://git.carbslinux.org/repository
- https://github.com/carbslinux/repository

#+BEGIN_EXAMPLE
  $ git clone git://git.carbslinux.org/repository $HOME/repos/carbs
#+END_EXAMPLE

**** Obtaining from rsync

Carbs Linux rsync repositories live in rsync://carbslinux.org/repo. In
order to obtain it, run the following:

#+BEGIN_EXAMPLE
  $ rsync -avc rsync://carbslinux.org/repo $HOME/repos/carbs
#+END_EXAMPLE

**** Making the package manager use the repositories

In your shell's configuration file, or in your =~/.profile= file, add the
following lines:

#+BEGIN_EXAMPLE
  export CPT_PATH=''
  CPT_PATH=$CPT_PATH:$HOME/repos/carbs/core
  CPT_PATH=$CPT_PATH:$HOME/repos/carbs/extra
  CPT_PATH=$CPT_PATH:$HOME/repos/carbs/xorg
  CPT_PATH=$CPT_PATH:$HOME/repos/carbs/community
  export CPT_PATH
#+END_EXAMPLE

*** Updating packages
:PROPERTIES:
:DESCRIPTION: Update your system
:END:

It is good practice to make sure your system is up to date, especially before
building new packages. If there is an update for the package manager you will
need to update twice.

#+BEGIN_EXAMPLE
  $ cpt-update && cpt-update
#+END_EXAMPLE

*** Installing packages
:PROPERTIES:
:DESCRIPTION: Install new software on your system
:END:

Since you are operating on a really small base, you might need to build and
install new programs to extend the functionality of your system. In order to
build and install packages new packages in Carbs, you need to execute the
following. "Package" is not actually a package and is given as an example.

#+BEGIN_EXAMPLE
  $ cpt-build   package
  $ cpt-install package
#+END_EXAMPLE

*** Essential Software
:PROPERTIES:
:DESCRIPTION: Software you might want to include on your system
:END:

Here is a list of software that you might want to have on your system.

*BOOTLOADERS*

- efibootmgr
- grub

*FILESYSTEMS*

- e2fsprogs
- dosfstools
- ntfs-3g

*NETWORKING*

- dhcpcd
- wpa_supplicant

*TEXT EDITORS*

- nano
- vim
- neatvi
- emacs
- emacs-nox (terminal-only version of emacs)

*USER SHELLS*

- bash
- zsh
- oksh
- rc

*POSIX BASE UTILITIES*

- busybox
- sbase
- coreutils

*DOCUMENTATION*

- carbs-docs
- man-pages
- man-pages-posix

*** Obtaining the documentation
:PROPERTIES:
:DESCRIPTION: Install documentation for offline use (optional)
:END:

All the documentation for Carbs Linux can be found on a single info manual to be
viewed offline. You can obtain texinfo or the info (standalone) package in order
to view the documentation.

#+BEGIN_EXAMPLE
  Install the documentation.
  $ cpt b carbs-docs && cpt i carbs-docs

  Install either texinfo or the info package. We will be installing standalone info
  as it doesn't need perl.
  $ cpt b info && cpt i info

  You can then run info and navigate through the documentation.
  $ info carbslinux
#+END_EXAMPLE

** System Configuration
:PROPERTIES:
:DESCRIPTION: Customizing your system for personal use
:END:

After you have finished installing some extra packages, you can configure your
system to your liking.

*** Configuring hostname
:PROPERTIES:
:DESCRIPTION: Setting up system hostname (recommended)
:END:

You might want to add a hostname, especially in a networked environment. Your
hostname will default to 'carbslinux' unless you set this.

#+BEGIN_EXAMPLE
  $ echo your-hostname > /etc/hostname
#+END_EXAMPLE

*** Hosts file
:PROPERTIES:
:DESCRIPTION: Setting up hosts file for networking (optional)
:END:

You can edit your /etc/hosts file, which is the static lookup table for host
names. By default, there are two entries for localhost which are OKAY. You can
replace the 'localhost' part of these entries to your hostname.

#+BEGIN_EXAMPLE
  127.0.0.1  localhost.localdomain localhost
  ::1        localhost.localdomain localhost ip6-localhost
#+END_EXAMPLE

** Kernel
:PROPERTIES:
:DESCRIPTION: Compiling your own kernel
:END:

Kernel isn't managed under the main repositories, even though you could package
one for your personal use. Here is an [[https://github.com/cemkeylan/kiss-repository/tree/master/personal/linux][example kernel package]], which you will
need to reconfigure for your specific setup if you want to make use of it.

*** Obtaining the kernel sources
:PROPERTIES:
:DESCRIPTION: Downloading the Linux source code
:END:

You can visit the [[https://kernel.org]] website to choose a kernel that you want
to install. Though only the latest stable and longterm (LTS) versions are
supported.

#+BEGIN_EXAMPLE
  Download the kernel and extract it
  $ wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.9.1.tar.xz
  $ tar xf linux-5.9.1.tar.xz

  Change directory into the kernel sources
  $ cd linux-5.9.1
#+END_EXAMPLE

*** Kernel dependencies
:PROPERTIES:
:DESCRIPTION: Requirements for building the kernel
:END:

In order to compile the kernel you will need to install some dependencies. You
will need =libelf= to compile the kernel. If you want to configure using the
menu interface you will also need =ncurses=.

#+BEGIN_EXAMPLE
  The package manager asks to install if you are building more than one package,
  so no need to run 'cpt i ...'
  $ cpt b libelf ncurses
#+END_EXAMPLE

In the vanilla kernel sources, you need perl to compile the kernel, but it can
be easily patched out. You will need to apply the following patch. Patch was
written by [[https://github.com/E5ten][E5ten]]. You will need to obtain and apply the patch in the kernel
source directory.

#+BEGIN_EXAMPLE
  $ wget https://dl.carbslinux.org/distfiles/kernel-no-perl.patch
  $ patch -p1 < kernel-no-perl.patch
#+END_EXAMPLE

*** Building the kernel
:PROPERTIES:
:DESCRIPTION: Configure and compile the kernel
:END:

Next step is configuring and building the kernel. You can check Gentoo's
[[https://wiki.gentoo.org/wiki/Kernel/Configuration][kernel configuration guide]] to learn more about the matter. Overall, Gentoo Wiki
is a good place to learn about configuration according to your hardware. The
following will assume a monolithic kernel.

#+BEGIN_EXAMPLE
  $ make menuconfig
  $ make
  $ install -Dm755 $(make -s image_name) /boot/vmlinuz-linux
#+END_EXAMPLE

** Making your system bootable
:PROPERTIES:
:DESCRIPTION: Installing bootloader and boot scripts
:END:

In order to be able to boot your fresh system, wou will need an init-daemon,
init-scripts and a bootloader. The init daemon is already provided by busybox,
but you can optionally change it.

*** Bootloader
:PROPERTIES:
:DESCRIPTION: Install a bootloader for your system
:END:

In the main repository, there is efibootmgr and grub to serve as bootloaders.
efibootmgr can be used as a standalone bootloader, or can be used to install
grub in a UEFI environment. efibootmgr is needed unless you are using a device
without UEFI support (or you really want to use BIOS for a reason).

**** GRUB BIOS installation

#+BEGIN_EXAMPLE
  $ cpt b grub && cpt i grub
  $ grub-install --target=i386-pc /dev/sdX
  $ grub-mkconfig -o /boot/grub/grub.cfg
#+END_EXAMPLE

**** GRUB UEFI installation

#+BEGIN_EXAMPLE
  $ cpt b efibootmgr && cpt i efibootmgr
  $ cpt b grub && cpt i grub

  $ grub-install --target=x86_64-efi \
                 --efi-directory=esp \
                 --bootloader-id=CarbsLinux

  $ grub-mkconfig -o /boot/grub/grub.cfg
#+END_EXAMPLE

*** Init scripts
:PROPERTIES:
:DESCRIPTION: Install init scripts for your system
:END:

Only thing left to do is installing the init-scripts, and now you are almost
ready to boot your system!

#+BEGIN_EXAMPLE
  $ cpt b carbs-init && cpt i carbs-init
#+END_EXAMPLE

*** Fstab
:PROPERTIES:
:DESCRIPTION: Generating fstab
:END:

You can now manually edit your fstab entry, or you can use the genfstab tool.
If you want to use the tool, exit the chroot and run the following:

#+BEGIN_EXAMPLE
  $ wget https://github.com/cemkeylan/genfstab/raw/master/genfstab
  $ chmod +x genfstab
  $ ./genfstab -U /mnt >> /mnt/etc/fstab
#+END_EXAMPLE

** Post-installation
:PROPERTIES:
:DESCRIPTION: Post-installation tasks
:END:

The base installation is now complete, you can now fine tune your system
according to your needs. Rest of these instructions are completely optional.
You can check the rest of the documentation to learn more about the system.

*** KISS repositories
:PROPERTIES:
:DESCRIPTION: Acquire kiss repositories
:END:

While not 100% compatible with cpt, you can use kiss repositories in your
system the same way you are using the distribution repositories. Here is an
example for the KISS Linux Community repository.

* Init System
:PROPERTIES:
:DESCRIPTION: Configure the init system
:END:

Carbs Linux init scripts are run by the init daemon (=busybox= by default) on
boot and shutdown processes. It also provides its own halting program named
shalt. This provides a portable method that doesn't rely on non-POSIX external
programs.

** Configuring Init
:PROPERTIES:
:DESCRIPTION: Ways to configure the init system
:END:

There are three ways you can change the behaviour of the init system. Those are:

- Kernel Command Line
- =/etc/init/rc.conf= file
- Init Hooks

*** Kernel Command Line
:PROPERTIES:
:DESCRIPTION: Configure init through the boot parameters
:END:

On GRUB, you can edit the kernel command line parameters, which will be parsed
as variables on the init system. Not all of the parameters will be acted upon,
but all of them will be set as variables on the init script. For example an
example command line, and how it is interpreted.

#+BEGIN_EXAMPLE
  BOOT_IMAGE=/boot/vmlinuz root=/dev/sda2 rw loglevel=3 quiet
#+END_EXAMPLE

This command line will be parsed to set the following variables:

#+BEGIN_EXAMPLE
  BOOT_IMAGE=/boot/vmlinuz
  root=/dev/sda2
  rw=1
  loglevel=3
  quiet=1
#+END_EXAMPLE

Some of these variables, such as =rw=/=ro=, =loglevel=, and =quiet=, will be
used by the init system to change the behaviour of the startup.

*** =/etc/init/rc.conf= file
:PROPERTIES:
:DESCRIPTION: Configure init through the configuration file
:END:

However, the kernel command line isn't the only place to set your boot
parameters. You can specify variables here as well, although note that the
kernel command line always gets the priority for these variables since they can
be set just before boot.

*** Init Hooks
:PROPERTIES:
:DESCRIPTION: Configure init through hooks
:END:

Init hooks are for custom personal commands that the user may want to add to
alter their boot. These can be used to load kernel modules, modify interfaces,
and lot more. Those hooks are added to the =/etc/init= directory with the
hook name as the suffix. For example, a boot script will be placed as
=/etc/init/my-hook.boot=. Currently, there are 4 hooks that the user can use.

- early-boot :: Run after pseudo-filesystems are mounted.
- boot :: Run before the boot stage is completed.
- pre.shutdown :: Run first when shutting down.
- umount :: Run just before filesystems are unmounted.
- post.shutdown :: Run just before the system is halted.

** Changing Init Program
:PROPERTIES:
:DESCRIPTION: Replace the default busybox init with something new
:END:

By default, Carbs Linux comes preinstalled with =busybox-init=, but this can
easily be replaced without any issues. Currently, available init systems are:

- =sinit=
- =busybox=
- =runit=
- =shinit=

This example is for runit, but it will work with all init systems packaged in the
distribution repositories. See the =cpt-alternatives(1)= manual page for more
details.

#+BEGIN_EXAMPLE
  $ cpt a runit /usr/bin/init
  $ cpt a runit /usr/bin/poweroff
  $ cpt a runit /usr/bin/reboot
#+END_EXAMPLE

*** Rebooting after changing init
:PROPERTIES:
:DESCRIPTION: Ways to reboot after replacing the init system
:END:

After switching init systems, your running init system may not accept the
new poweroff commands. You will need to reboot/poweroff using the running init's
utilities for the new utilities to work. These commands are for the init system
currently running on your system and not the one you are switching to.

| Program      | Command          |
|--------------+------------------|
| busybox      | =busybox reboot= |
| runit        | =runit-init 6=   |
| shinit/sinit | =kill -s INT 1=  |

* Contribution Guidelines
:PROPERTIES:
:DESCRIPTION: Contribute to Carbs Linux
:END:

Thanks for taking your time to contribute! To maintain stylistic behaviour
throughout the repositories, one must adhere to these conventions. Exceptions
and changes may occur with good reasoning.

** Conventions
:PROPERTIES:
:DESCRIPTION: Conventions of the distribution
:END:

#+TEXINFO: @macro contid{id}
#+TEXINFO: [@anchor{\id\}\id\]
#+TEXINFO: @end macro

#+TEXINFO: @macro sectid{id, sect}
#+TEXINFO: @strong{@contid{\id\} \sect\}
#+TEXINFO: @end macro

- {{{contid(0010)}}} :: Try to keep the file readable.
  - {{{contid(0011)}}} :: Characters on a line shouldn't exceed 100 characters.
  - {{{contid(0012)}}} :: Make sure you don't have code commented out during
    commit. Uncomment them or remove them completely.
  - {{{contid(0013)}}} :: Do not add comments following the code, add them to the
    top of the code. It makes it harder to read, and lines longer. Here is an example:

  #+BEGIN_EXAMPLE
    # Good way of commenting.
    your code goes here

    your code goes here  # Avoid this way of commenting.
  #+END_EXAMPLE

*** Shell Conventions
:PROPERTIES:
:DESCRIPTION: Conventions for shell scripts
:END:

Shell is central to Carbs Linux projects. Most of the tools and packages are
written in POSIX sh.

- {{{contid(1010)}}} :: Use 4 spaces for indentation, don't use tabs.
- {{{contid(1020)}}} :: Make sure you don't use bash-specific code.
- {{{contid(1030)}}} :: Make sure you lint your code with =shellcheck= and if
  you are new to POSIX sh, use =checkbashisms=.
- {{{contid(1040)}}} :: Don't spawn new processes if you don't absolutely need
  to, especially during string manipulation.
  - {{{contid(1041)}}} :: Never use a program for text manupilation that isn't
    defined in the POSIX standard. This includes =gawk= and =perl=.
  - {{{contid(1042)}}} :: Instead of ~$(basename $file)~, use ~${file##*}~.
  - {{{contid(1043)}}} :: Instead of ~$(dirname $file)~, use ~${file%/*}~.

  #+BEGIN_EXAMPLE
    # This is the same thing as basename /path/to/test.asc .asc

    $ file=/path/to/test.asc file=${file##*/} file=${file%.asc}
    $ echo $file
    test
  #+END_EXAMPLE
- {{{contid(1050)}}} :: Instead of backticks, use ~$(..)~.

*** Repository Conventions
:PROPERTIES:
:DESCRIPTION: Conventions for repository build scripts
:END:

Repository conventions are important in order to ensure every package resemble
themselves. Here are the things to keep in mind:

- {{{contid(2010)}}} :: Prefer tarballs over git packages unless there is a
  sensible reason. Here are some:
  - Every patch is a new release. (See [[https://github.com/vim/vim][vim]])
  - There are no releases. (See [[https://git.suckless.org/sbase][sbase]])
  - Following a development branch.
  - There has been a long time since the latest release, but upstream is far
    ahead.
- {{{contid(2020)}}} :: Prefer sources without a dependency to =automake=. There
  are usually distribution tarballs that are =autoconf='ed. Don't submit tarballs
  with an automake dependency unless you are =sure= there is no alternative.
- {{{contid(2030)}}} :: Avoid these packages:
  - dbus    :: Usually can be disabled by ~--disable-dbus~.
  - gettext :: Usually can be disabled by ~--disable-nls~.
- {{{contid(2040)}}} ::
  - Always install a package to the =/usr= prefix.
  - All binaries should go to =/usr/bin=, not =/usr/sbin= or any other directory.
  - All libraries should go to =/usr/lib=.
- {{{contid(2050)}}} :: All build files on the repository should be a POSIX
  shell script, and must start with ~#!/bin/sh -e~.

The next section is about package templates that should be used in order to
ensure stylistic consistency. Note that the option configurations shouldn't be
taken literally, they are meant as examples.

**** {{{sectid(2210, Make)}}}

#+BEGIN_SRC sh
  #!/bin/sh -e

  make
  make DESTDIR="$1" PREFIX=/usr install
#+END_SRC

**** {{{sectid(2211, Configure/Make)}}}

#+BEGIN_SRC sh
  #!/bin/sh -e

  ./configure \
      --prefix=/usr \
      --disable-option \
      --enable-option

  make
  make DESTDIR="$1" install
#+END_SRC

**** {{{sectid(2212, Autoconf/Automake)}}}

#+TEXINFO: @xref{2020}

#+BEGIN_SRC sh
  #!/bin/sh -e

  autoreconf -fi

  ./configure \
      --prefix=/usr \
      --disable-option \
      --enable-option

  make
  make DESTDIR="$1" install
#+END_SRC

**** {{{sectid(2220, Meson)}}}

#+BEGIN_SRC sh
  #!/bin/sh -e

  export DESTDIR=$1

  meson \
      --prefix=/usr \
      -Doption=false \
      -Doption2=true \
      . output

  ninja -C output
  ninja -C output install
#+END_SRC

**** {{{sectid(2230, Cmake)}}}

#+BEGIN_SRC sh
  #!/bin/sh -e

  export DESTDIR=$1

  cmake -B build \
      -DCMAKE_INSTALL_PREFIX=/usr \
      -DCMAKE_BUILD_TYPE=Release \
      -DOPTION=ON

  cmake --build   build
  cmake --install build
#+END_SRC

**** {{{sectid(2240, Go)}}}

#+BEGIN_SRC sh
  #!/bin/sh -e

  export GOPATH=$PWD/gopath
  trap "go clean -modcache" EXIT INT
  go mod vendor

  go build
  install -Dm755 program "$1/usr/bin/program"
#+END_SRC

**** {{{sectid(2241, Python)}}}

#+BEGIN_SRC sh
  #!/bin/sh -e

  python setup.py build
  python setup.py install --prefix=/usr --root="$1"
#+END_SRC

* GNU Free Documentation License
:PROPERTIES:
:APPENDIX: t
:DESCRIPTION: Your rights
:END:

#+INCLUDE: fdl.org