On Sat, Sep 19, 2020 at 3:48 AM Daniel Pocock <daniel@xxxxxxxxxx> wrote: > > > I noticed another thread about subvolumes already exists, I'm starting > this one for the very specific topic of installing multiple root > filesystems as subvolumes > > Examples: Fedora 33 in one subvolume, Fedora rawhide in another > subvolume, Fedora 33 32-bit in another subvolume, maybe RHEL in a > subvolume too > > Can this be supported by the installer? > > Can it be supported by grub? > > If somebody installs their OS to the top level of their btrfs today, can > they pivot that into a subvolume later? > > All these OS installs would shared some things like /home It's generally possible when narrowing the parameters. There's a new QA test case for preserving /home use case. The intent of the use case is not dual boot but rather merely to ensure the user's home subvolume is reused when clean installing. This is possible with LVM+ext4 layout because /home is a separate file system; merely reformatting the root and reusing its space for a new /. Whereas with Btrfs, in fact the old root is also preserved (not destroyed), it's effectively left alone and abandoned (its fate is not addressed in the test case). https://fedoraproject.org/wiki/QA:Testcase_partitioning_custom_btrfs_preserve_home There is a variation on this test case that's still in draft form. It could be a starting point for further describing exactly what conditions we could support Fedora multiboot. Right now Fedora release criteria only specify dual boot in relation to Windows and macOS, not any other Linux distribution including Fedora. While much of the possibility for supporting dual boot Fedora goes to the BootLoaderSpec effort, the Btrfs by default effort makes it's more space efficient to support. https://fedoraproject.org/wiki/User:Sumantrom/Draft/dualboot_f33_btrfs Neither of these take into account any sort of snapshot/rollback regime. That's a bit more complicated. But on the plus side, there is a rather straightforward way to have combinations: Server + Workstation, Workstation + KDE, Workstation + Silverblue. For the adventurous and ultra efficiency seekers, such installations would be highly prone to being deduped. Of course from the DE's perspective, these are still completely separate installations, with separate system updates, separate RPM databases, and so on. -- Chris Murphy _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
