core-initrd: fix create-initrd default option in post installation sc…

[john-cabaj]

…ript

6a19b57: "core-initrd: adding "azure-fde" option to post installation script" moved the create-initrd call into only amd64 arches, which broke arm64 and armhf use cases

[Meulengracht]

Is this comment wrong now?

[john-cabaj]

I don’t know that’s it’s explicitly wrong, as the only thing that previously guarded was a call to create-efi. Previous to my past commit, create-initrd was called regardless. That’s what this is trying to re-implement.

[Meulengracht]

Right, can you verify this runs fine on arm64?

[john-cabaj]

Seems to have worked:

azure@john-cabaj-uci-test-kcp:~$ sudo apt install ./ubuntu-core-initramfs_51.20_arm64.deb 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'ubuntu-core-initramfs' instead of './ubuntu-core-initramfs_51.20_arm64.deb'
The following NEW packages will be installed:
  ubuntu-core-initramfs
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
After this operation, 70.7 MB of additional disk space will be used.
Get:1 /home/azure/ubuntu-core-initramfs_51.20_arm64.deb ubuntu-core-initramfs arm64 51.20 [18.9 MB]
Selecting previously unselected package ubuntu-core-initramfs.
(Reading database ... 89662 files and directories currently installed.)
Preparing to unpack .../ubuntu-core-initramfs_51.20_arm64.deb ...
Unpacking ubuntu-core-initramfs (51.20) ...
Setting up ubuntu-core-initramfs (51.20) ...
W: Repository is broken: ubuntu-core-initramfs:arm64 (= 51.20) has no Size information
azure@john-cabaj-uci-test-kcp:~$ /etc/kernel/postinst.d/ubuntu-core-initramfs 
usage: ubuntu-core-initramfs create-initrd [-h] [--root ROOT] [--skeleton SKELETON] [--feature FEATURES [FEATURES ...]] [--kerneldir KERNELDIR] [--kernelver KERNELVER]
                                           [--firmwaredir FIRMWAREDIR] [--output OUTPUT]
ubuntu-core-initramfs create-initrd: error: argument --kernelver: expected one argument
azure@john-cabaj-uci-test-kcp:~$ /etc/kernel/postinst.d/ubuntu-core-initramfs 5.4.0-1151-azure
Traceback (most recent call last):
  File "/usr/bin/ubuntu-core-initramfs", line 248, in <module>
    main()
  File "/usr/bin/ubuntu-core-initramfs", line 244, in main
    globals()[args.subcmd.replace("-", "_")](parser, args)
  File "/usr/bin/ubuntu-core-initramfs", line 77, in create_initrd
    with open(args.output, "wb") as output:
PermissionError: [Errno 13] Permission denied: '/boot/ubuntu-core-initramfs.img-5.4.0-1151-azure'
azure@john-cabaj-uci-test-kcp:~$ sudo /etc/kernel/postinst.d/ubuntu-core-initramfs 5.4.0-1151-azure
azure@john-cabaj-uci-test-kcp:~$

[john-cabaj]

initrd generated:

azure@john-cabaj-uci-test-kcp:~$ ls -lt /boot/
total 135225
-rw-r--r-- 1 root root 19927668 Jul 17 16:23 ubuntu-core-initramfs.img-5.4.0-1151-azure
-rw-r--r-- 1 root root 29943639 Jul 17 16:02 initrd.img-5.4.0-1166-azure
drwxr-xr-x 4 root root     4096 Jul 17 16:02 grub
-rw-r--r-- 1 root root 19927743 Jul 17 16:02 ubuntu-core-initramfs.img-5.4.0-1166-azure
lrwxrwxrwx 1 root root       27 Jul 17 16:01 initrd.img -> initrd.img-5.4.0-1166-azure
lrwxrwxrwx 1 root root       24 Jul 17 16:01 vmlinuz -> vmlinuz-5.4.0-1166-azure
lrwxrwxrwx 1 root root       27 Jul 17 15:56 initrd.img.old -> initrd.img-5.4.0-1151-azure
lrwxrwxrwx 1 root root       24 Jul 17 15:56 vmlinuz.old -> vmlinuz-5.4.0-1151-azure
-rw-r--r-- 1 root root 29943381 Jul 17 15:54 initrd.img-5.4.0-1151-azure
-rw------- 1 root root 13141358 Jun 24 18:45 vmlinuz-5.4.0-1166-azure
-rw------- 1 root root  6026324 Jun 24 18:44 System.map-5.4.0-1166-azure
-rw-r--r-- 1 root root   180868 Jun 24 18:44 config-5.4.0-1166-azure
-rw------- 1 root root 13137028 Apr 24  2025 vmlinuz-5.4.0-1151-azure
-rw------- 1 root root  6025670 Apr 24  2025 System.map-5.4.0-1151-azure
-rw-r--r-- 1 root root   180868 Apr 24  2025 config-5.4.0-1151-azure
drwx------ 3 root root      512 Jan  1  1970 efi