I'm installing gentoo hardened on several machines all with btrfs root filesystems, the simplest of which is a single gpt partitioned disk. This is my current partitioning scheme (based on numerous conflicting explainations on the wiki and handbook):
# gdisk /dev/sda -l GPT fdisk (gdisk) version 1.0.1 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sda: 1953525168 sectors, 931.5 GiB Logical sector size: 512 bytes Disk identifier (GUID): 4C1FE8C1-69CE-4433-A3E4-7060FFF5AF10 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 1953525134 Partitions will be aligned on 2048-sector boundaries Total free space is 2014 sectors (1007.0 KiB) Number Start (sector) End (sector) Size Code Name 1 2048 1050623 512.0 MiB EF00 EFI System 2 1050624 9439231 4.0 GiB 8200 Linux swap 3 9439232 1953525134 927.0 GiB 8300 Linux filesystem grub2-mkconfig generates no menu entries. Do I need anything generated by /etc/grub.d/00_header? That output looks like garbage. The only real relevant configuration in /etc/default/grub should be correct. GRUB_CMDLINE_LINUX="root=UUID=f0373f0c-3798-4965-a845-b1b94cc14731 rootfstype=btrfs rootflags=rw,noatime,compress=zlib,space_cache,subvol=rootfs" I've tried several values for GRUB_DEVICE, which has no effect. This page says an initramfs isn't needed even (for either btrfs RAID or non-RAID configuration), though several pages disagree on this. https://wiki.gentoo.org/wiki/GRUB2 grub2-install also fails: # grub2-install --target=x86_64-efi /dev/sda Installing for x86_64-efi platform. grub2-install: error: cannot find EFI directory. What EFI directory? The one I created under /boot? I've also tried a pure EFI stub loader. Attempting to build a dracut image into the kernel causes the build to fail in various ways depending on the compression method used. GEN usr/initramfs_data.cpio.gz ERROR: incorrect format, could not locate file type line 8: '' usr/Makefile:73: recipe for target 'usr/initramfs_data.cpio.gz' failed make[1]: *** [usr/initramfs_data.cpio.gz] Error 255 Makefile:949: recipe for target 'usr' failed make: *** [usr] Error 2 make: *** Waiting for unfinished jobs... This page suggests generating an uncompressed image with dracut and renaming the file with a .cpio extension which I'd guess is erroneous advice. https://wiki.gentoo.org/wiki/EFI_stub_kernel . The remaining instructions WRT eficompmgr all seem to assume I've been able to build a kernel with a built-in command line and initramfs. Is there any simpler way of doing this? I've gotten grub2 to work with a btrfs RAID 10 and initramfs in the past but somehow grub2-mkconfig isn't working now.
