Public bug reported:
Using the Ubuntu netboot installer as obtained from
http://archive.ubuntu.com/ubuntu/dists/bionic-updates/main/installer-
amd64/current/images/netboot/ubuntu-installer/amd64/ the installer fails
to run a preseed/early_command set from the kernel command line (added
to the menu entry in grub.cfg).
A precisely equivalent config does cause the command to run in Debian 10
and 9, so this appears to be a difference between Debian's version of
debian-installer and the one in Ubuntu. The preseeded command can be
made to work in Ubuntu if instead placed in a preseed.cfg inserted into
the initrd, so the issue appears to be specific to setting
preseed/early_command from the kernel commandline.
For example, setting only the following grub config options: (this is on
a Xen system)
set root=(xen/xvdd,msdos1)
linux /installer-ubuntu/18.04/linux "preseed/early_command=logger wibble"
initrd /installer-ubuntu/18.04/initrd.gz
and the interrupting the install, starting a shell and running 'grep
wibble /var/log/syslog' shows only the kernel commandline, whereas on
Debian 10 with the following grub config
set root=(xen/xvdd,msdos1)
linux /installer-debian/10/vmlinuz "preseed/early_command=logger wibble"
initrd /installer-debian/10/initrd.gz
and again interrupting the install and running 'grep wibble /var/log/syslog'
from the shell produces:
Sep 24 17:09:57 kernel: [ 0.000000] Command line:
"preseed/early_command=logger wibble"
Sep 24 17:09:57 kernel: [ 0.412794] Kernel command line:
"preseed/early_command=logger wibble"
Sep 24 17:09:57 preseed: running preseed command preseed/early_command: logger
wibble
Sep 24 17:09:57 root: wibble
adding DEBCONF_DEBUG=5 to the kernel command line on Ubuntu and running
'egrep early_command\|wibble /var/log/syslog' produces:
Sep 24 17:19:13 kernel: [ 0.000000] Command line:
"preseed/early_command=logger wibble" DEBCONF_DEBUG=5
Sep 24 17:19:13 kernel: [ 0.000000] Kernel command line:
"preseed/early_command=logger wibble" DEBCONF_DEBUG=5
Sep 24 17:19:14 frontend: --> GET preseed/early_command
Sep 24 17:19:14 frontend: --> SET preseed/early_command logger wibble
Sep 24 17:19:14 frontend: --> METAGET preseed/early_command type
Sep 24 17:19:14 frontend: --> FSET preseed/early_command seen true
So the preseed value does get picked up by debconf, it's just that the
installer never actually runs the command.
Thanks for your help,
** Affects: base-installer (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1845239
Title:
preseed/early_command doesn't work from kernel command line
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