Building your own Arch installation ISO

This is really well covered in https://wiki.archlinux.org/index.php/archiso, but I will illustrate it in a step-by-step way on my exact example.

sudo pacman -S archiso
sudo -i
mkdir archiso
cp -r /usr/share/archiso/configs/releng/* ~/archiso
cd archiso
nano build.sh. This is a building script for an ISO, edit it to shape your distibution, here's what I did:
Remove all i686 from the file
Replace 40M in truncate -s 40M with 50M. No idea why, but 40 MBs is just not enough.
I needed a broadcom-wl package, so my Wi-Fi card would work in the ISO:
Launch another terminal, since it is not possible to run makepkg in root envinronment.
wget https://aur.archlinux.org/cgit/aur.git/snapshot/broadcom-wl.tar.gz
tar -xvf broadcom-wl.tar.gz
cd broadcom-wl
makepkg -s. -s means install dependencies. It is possible to do it here, because linux-headers depndency of the package is make-dependent, so I don't really need it in my ISO. Always check the needed depndencies, when adding custom packages.
Leave the resulting package in the directory or copy it anywhere, but remember the path!
mkdir custompkg/x86_64
Copy the built package into that folder
repo-add custompkgs/x86_64/custompkgs.db.tar.gz custompkgs/x86_64/broadcom-wl*
Return to your root shell
nano pacman.conf and add (replace /root/ with a path to to your custompkgs)

 [custompkgs]
 SigLevel = Optional TrustAll
 Server = file:///root/custompkgs/$arch

Next two lines are only needed, because I need to disable two kernel modules. But if you have some iso-building-time execution required, place it in airootfs/root/customize_airootfs.sh:

echo "blacklist b43" >> /etc/modprobe.d/blacklist.conf
echo "blacklist ssb" >> /etc/modprobe.d/blacklist.conf

nano packages.x86_64, and add whatever packages you need. I added fish and python2.
You are ready to go! ./build.sh -v

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