diskimage-builder/diskimage_builder/elements/fedora-minimal
Steve Baker 27a326dafb Support secure-boot bootloader where possible
As of grub2 >= 2.02-95 on redhat family distros, calling grub2-install
on an EFI partition will fail with: "this utility cannot be used for
EFI platforms because it does not support UEFI Secure Boot."

This version of grub is now in centos8-stream and non-eus repos of
RHEL-8. It is not currently possible to build whole-disk UEFI images
on these distros, and when this package is promoted this will also
affect centos8 and RHEL-8 eus. The grub maintainers made this change
because the grub2-install generated /boot/efi/EFI/BOOT/BOOTX64.EFI
will never be capable of booting with Secure Boot.

This change defines a $EFI_BOOT_DIR for every distro element. When
directory /boot/efi/$EFI_BOOT_DIR exists a grub.cfg file in will be
generated there. This change also installs the shim package on redhat
family distros, which installs a copy of the shim bootloader to
/boot/efi/EFI/BOOT/BOOTX64.EFI. Using centos as an example, this
allows UEFI to boot the shim /boot/efi/EFI/BOOT/BOOTX64.EFI which
then chains to /boot/efi/EFI/centos/grubx64.efi.

If /boot/efi/$EFI_BOOT_DIR doesn't exist (such as for Ubuntu,
/boot/efi/EFI/ubuntu) the current behaviour of running grub-install to
generate /boot/efi/EFI/BOOT/BOOTX64.EFI will continue. For distros
such as Ubutnu where packaging does not populate /boot/efi/EFI/ubuntu
with .efi files, secure boot can be added in the future by copying
.efi files to /boot/efi/EFI/ubuntu and copying the shim file to
/boot/efi/EFI/BOOT/BOOTX64.EFI.

Change-Id: I90925218ff2aa4c4daffcf86e686b6d98d6b0f21
2021-03-11 10:27:59 +13:00
..
environment.d Support secure-boot bootloader where possible 2021-03-11 10:27:59 +13:00
test-elements/build-succeeds GPT partitioning support 2018-02-23 10:04:26 +11:00
yum.repos.d Remove "failovermethod=priority" for Fedora (dnf) 2019-10-01 06:01:15 +00:00
element-deps Move elements & lib relative to diskimage_builder package 2016-11-01 17:27:41 -07:00
element-provides Move elements & lib relative to diskimage_builder package 2016-11-01 17:27:41 -07:00
README.rst Release 1.27.0 2017-02-03 11:49:45 +11:00

==============
fedora-minimal
==============
Create a minimal image based on Fedora.

Use of this element will require 'yum' and 'yum-utils' to be installed on
Ubuntu and Debian. Nothing additional is needed on Fedora or CentOS. The
element will need `python-lzma` everywhere.

Due to a bug in the released version of urlgrabber, on many systems an
installation of urlgrabber from git is required. The git repository
can be found here: http://yum.baseurl.org/gitweb?p=urlgrabber.git;a=summary

This element sets the ``DIB_RELEASE`` var to 'fedora'. The release of
fedora to be installed can be controlled through the ``DIB_RELEASE``
variable, which defaults the latest supported release.