[Bug 172465] Re: Can't create initramfs for module-less kernel

[Benjamin Drung]

I tested on Ubuntu 24.04 "noble":

```
$ schroot-wrapper -p linux-image-generic,initramfs-tools,zstd -c noble -u root
$ rm -r /lib/modules/6.5.0-9-generic/
$ update-initramfs -u -k 6.5.0-9-generic
W: missing /lib/modules/6.5.0-9-generic
W: Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/6.5.0-9-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
cat: /var/tmp/mkinitramfs_VFqof8/lib/modules/6.5.0-9-generic/modules.builtin: No such file or directory
W: Can't find modules.builtin.modinfo (for locating built-in drivers' firmware, supported in Linux >=5.2)
depmod: WARNING: could not open modules.order at /var/tmp/mkinitramfs_VFqof8/lib/modules/6.5.0-9-generic: No such file or directory
depmod: WARNING: could not open modules.builtin at /var/tmp/mkinitramfs_VFqof8/lib/modules/6.5.0-9-generic: No such file or directory
depmod: WARNING: could not open modules.builtin.modinfo at /var/tmp/mkinitramfs_VFqof8/lib/modules/6.5.0-9-generic: No such file or directory
$ echo $?
0
```

So it spits out some warning/error, but it produces the correct
initramfs and exits with 0.

** Changed in: initramfs-tools (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/172465

Title:
  Can't create initramfs for module-less kernel

Status in initramfs-tools package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: initramfs-tools

  I want to create an initramfs for a kernel without modules (actually
  without module support) on Gutsy (using initramfs-tool 0.85eubuntu20).

  update-initramfs fails because mkinitramfs-kpkg can't handle the
  missing /lib/modules/<kernel-version> directory.

  If I create an empty /lib/modules/<kernel-version> dir, everything
  works fine. That means, I get a working initramfs without any modules.

  (The reason for creating an initramfs for a module-less kernel is that
  my / is on LVM2.  The volume needs to get activated by the initramfs.)

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