It's not reliable to use files from the host system. There's no guarantee that the packages which provide them are up to date or that they are not modified. Solving this could, theoretically, make it possible to build ISOs on non-Arch systems as long as they have *pacman* and *arch-install-scripts*. - [x] archiso's custom mkinitcpio hooks should be installed in airoots not copied from host: !50 . - [x] The UEFI shell should be acquired by installing edk2-shell in airootfs and copying it from there: !57 .