Hi,
I recently upgraded and encountered the same problem.
Here is my analysis :
plymouth has been splitted in plymouth and plymouth-drm.
script.so, the script engine for themes that was in the "plymouth" package is
now in plymouth-drm.
Now, suppose you've got a plymouth theme requiring script.so installed on your
system. This theme is configured by default in /etc/plymouth/plymouthd.conf.
When you'll upgrade plymouth packages (to testing's version), the first package
to be upgraded by apt/aptitude will likely be plymouth, before plymouth-drm is
installed. And plymouth launches update-initramfs (both from postinst and with a
trigger !).
update-initramfs will run plymouth's hook, which will it turn
1/ discover which theme is used on the system (plymouthd.conf)
2/ find what dependencies does this theme have
3/ include those dependencies in the initramfs.
As you've guessed by now, one of those dependencies is script.so; and it has
been removed from plymouth package; and plymouth-drm is not installed yet ; and
neither is the new version of the theme which now depends on plymouth-drm.
Therefore update-initramfs will fail with a message like this one (in french,
sorry):
E: /usr/share/initramfs-tools/hooks/plymouth failed with return 1.
update-initramfs: failed for /boot/initrd.img-2.6.32-5-686
dpkg : erreur de traitement de initramfs-tools (--unpack) :
le sous-processus script post-installation installé a retourné une erreur de
sortie d'état 1
configured to not write apport reports
Des erreurs ont été rencontrées pendant
l'exécution :
initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)
Of course /etc/plymouth/plymouthd.conf is a conffile, and user could chose to
use plymouth's version which uses theme not depending on script.so; but
conffiles are processed after postinst and triggers so it never reaches this
point.
Now, I'm not sure yet about what's the best solution to this problem:
- erase user's conffile plymouthd.conf in postinst before update-initramfs.
But
I'm not sure this is the Debian way.
- fix plymouth's initramfs hook so it doesn't fail if theme has missing files,
and fallbacks on plymouth's default provided theme (text)
- make sure plymouth-drm is installed before plymouth is upgraded
- put plymouth-drm back into plymouth
- what Osamu proposed
- something else.
Regards,
Anisse
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