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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
pre-install.d Fix hooks order for CentOS/Fedora when mirror used 2021-03-04 10:54:52 +00:00
root.d Fix Fedora aarch64 image location 2019-04-09 15:50:55 +00:00
test-elements/build-succeeds Start at using CI mirrors for fedora/centos 2017-06-21 12:02:27 +10:00
element-deps Run dib-run-parts out of /tmp 2017-04-05 13:11:22 +10:00
element-provides Move elements & lib relative to diskimage_builder package 2016-11-01 17:27:41 -07:00
package-installs.yaml Trivial fix typos 2017-05-31 11:17:05 +07:00
README.rst Move elements & lib relative to diskimage_builder package 2016-11-01 17:27:41 -07:00

README.rst 

======
fedora
======

Use Fedora cloud images as the baseline for built disk images. For further
details see the redhat-common README.

Environment Variables
---------------------

DIB_DISTRIBUTION_MIRROR:
   :Required: No
   :Default: None
   :Description: To use a Fedora Yum mirror, set this variable to the mirror URL
                 before running bin/disk-image-create. This URL should point to
                 the directory containing the ``releases/updates/development``
                 and ``extras`` directories.
   :Example: ``DIB\_DISTRIBUTION\_MIRROR=http://download.fedoraproject.org/pub/fedora/linux``