Fedora 17’s unified filesystem (/usr-move)

[Harald Hoyer]

Am 27.01.2012 14:33, schrieb Stijn Hoop:
> Hi,
> 
> thanks for the detailed instructions for testing. I am not sure
> though, whether any of this is applicable on a system already running
> rawhide?
> 
> Reading this, I surmise that I have to do the following steps once
> these packages hit rawhide. Can you comment on the correctness?
> 
>> Currently installed systems need some manual steps to convert the
>> current system to match the layout of rawhide/Fedora 17. After that,
>> the system can continue to be updated with YUM as usual.
> 
>> Download and install the most recent dracut package from rawhide:
>>  # yum --enablerepo=rawhide update dracut
> 
> This will hit me soon automatically (as it is in rawhide proper, and I
> update regularly).

yes

> 
>> Update the installed initramfs image for your current kernel, and
>> instruct dracut to include the dracut module to convert your current
>> filesystem: # dracut --force --add usrmove
>>
>> If dracut detects ‘rd.usrmove’ on the kernel command line at bootup,
>> it starts the filesystem conversion of the root filesystem.
>>
>> Change the following kernel commandline parameter directly in the
>> bootloader menu, which is shown during bootup, or edit the line
>> in /etc/grub*.cfg.
>>  - remove “ro”
>>  - append “rw” to let dracut mount your root filesystem writeable
>>  - remove “rhgb” to hide the graphical bootsplash
>>  - append “rd.info” to get a more verbose output from dracut
>>  - append “rd.usrmove” to enable the /usr-move conversion script in
>> dracut
> 
> These two steps are needed as well, however...
> 
>>  - append “selinux=0” for now, because the relabeling in a converted
>> F16 system does not seem to work properly at this moment
> 
> ... do you know if this is applicable for a correctly labeled rawhide
> as well?

might be, please test :-)

> 
>> Any files with conflicting names, which the conversion could not
>> resolve, will be backed up to files named *.usrmove~ residing
>> in /usr/lib, /usr/lib64, /usr/bin and /usr/sbin.
> 
> Sidenote: should we file these as bugs?
> 
>> After a successful conversion, revert the changes made to the kernel
>> command line in the bootloader config file /etc/grub*.cfg.
> 
> This step is needed.
> 
>> SELinux relabelling should take effect after you rebooted your
>> updated system and can take a long time (at least in a VM it takes
>> insanely long and is still not finished). We are currently
>> investigating, what seem to take so long, so you might consider to
>> test with SELinux disabled for now.
> 
> Again, is this only for hosts based on F16?

might be. please test.

> 
>> Until the rawhide repository gets all the converted rpms, use the
>> f17-usrmove repository to update the system after the filesystem
>> conversion and disable rawhide in the
>> file /etc/yum.repos.d/fedora-rawhide.repo
> 
> When the tag hits rawhide proper, I assume this can be skipped?

Yes, we will announce this, if we move the tag after the testing.

> 
> Can I update dracut now, and wait for the rest of the tag to hit
> rawhide before adding the rd.usrmove flag?

sure

> 
> Regards,
> 
> --Stijn