On Sat, Oct 19, 2024 at 01:32:12PM GMT, Vladimir 'phcoder' Serbinenko wrote: > What if I put /boot and /boot/grub in different sub volumes? How do I set > variables then in order to correctly load additional modules from $prefix > and yet load correct kernels? This convoy is needed in order to load > several linuxes from the same btrfs (think installing v1 then making a > clone and upgrading one of them to v2).
The problem of incompatible modules and core images due to floating $prefix to any subvolume is mitigated by utilizing monolithic or standalone images like UEFI Secure Boot these days. For i386-pc or any other use case where embedding a standalone image is not applicable due to size constraints etc, we create a separate subvolume and mount it to /boot/grub2/i386-pc. At grub runtime, we use btrfs-mount-subvol, present in the patch [1], to remount it to /boot/grub/i386-pc, making it accessible in place. [1] https://lists.gnu.org/archive/html/grub-devel/2024-10/msg00089.html Thanks, Michael > > Le lun. 14 oct. 2024, 20:09, Leo Sandoval <lsand...@redhat.com> a écrit : > > > From: Michael Chang <mch...@suse.com> > > > > We should export btrfs_subvol and btrfs_subvolid to have both visible > > to subsidiary configuration files loaded using configfile. > > > > Signed-off-by: Michael Chang <mch...@suse.com> > > --- > > grub-core/fs/btrfs.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c > > index 8e2b1e9f7..14e38a4df 100644 > > --- a/grub-core/fs/btrfs.c > > +++ b/grub-core/fs/btrfs.c > > @@ -2920,6 +2920,8 @@ GRUB_MOD_INIT (btrfs) > > subvol_set_env); > > grub_register_variable_hook ("btrfs_subvolid", subvolid_get_env, > > subvolid_set_env); > > + grub_env_export ("btrfs_subvol"); > > + grub_env_export ("btrfs_subvolid"); > > } > > > > GRUB_MOD_FINI (btrfs) > > -- > > 2.46.2 > > > > > > _______________________________________________ > > Grub-devel mailing list > > Grub-devel@gnu.org > > https://lists.gnu.org/mailman/listinfo/grub-devel > > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
