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#+TITLE: Session Context - Active Session
#+DATE: 2026-01-25
* Session: Saturday 2026-01-24 @ 18:09 CST (continued to ~00:10 Sunday)
** Current Task: Phase 4.3 Validation Checks - Reboot Test Debugging
*** Summary
We're implementing automated reboot survival and rollback tests for btrfs
installations. The installation itself works, but the reboot test is failing
because GRUB drops to grub> prompt after reboot.
*** Root Cause Identified
The grub.cfg file is EMPTY (0 bytes) after the VM is killed, even though it
was 5652 bytes when checked inside the running VM. This is a FAT32 filesystem
sync issue - data wasn't flushed before the VM was terminated.
*** Fixes Applied (committed)
1. GRUB modules stored on EFI partition (FAT32) with --boot-directory=/efi
2. Symlink /boot/grub -> /efi/grub created BEFORE grub-mkconfig
3. Added sync after grub-mkconfig (ensure FAT32 write completes)
4. Added sync before unmounting EFI in cleanup
5. Test framework now uses correct password (ROOT_PASSWORD from config) for
post-reboot SSH instead of ISO password (archzfs)
*** Commits Made This Session
- 7bb88b9 Fix GRUB boot for btrfs with subvolumes
- 36d429e Add reboot survival and rollback verification tests
- 79b4522 Update test config and documentation
*** Files Modified
- custom/lib/btrfs.sh - GRUB on EFI, sync calls
- scripts/test-install.sh - reboot/rollback test infrastructure, password handling
- scripts/test-configs/btrfs-single.conf - added NO_ENCRYPT=yes
- custom/RESCUE-GUIDE.txt - offline Arch Wiki section
- todo.org - updated completed tasks
*** Test Infrastructure Added to test-install.sh
#+begin_src bash
# New functions:
start_vm_from_disk() # Boot VM from installed disk (no ISO)
stop_vm() keep_vars # Optional param to preserve EFI boot entries
wait_for_ssh() password # Optional password param (for installed system)
ssh_cmd() # Uses INSTALLED_PASSWORD when set
verify_reboot_survival() # Checks system boots, filesystem healthy
verify_rollback() # Tests snapshot create/rollback
# Flow in run_test():
# 1. Boot ISO, install system
# 2. Verify installation
# 3. stop_vm with keep_vars=true (preserve OVMF_VARS)
# 4. start_vm_from_disk (no ISO, boot from disk)
# 5. wait_for_ssh using ROOT_PASSWORD from config
# 6. verify_reboot_survival
# 7. verify_rollback
# 8. Cleanup
#+end_src
*** Current Test Status
- Installation: PASSES (verified manually and in tests)
- Post-install verification: PASSES
- Reboot test: FAILS - grub.cfg is empty after VM killed
The sync fix was just committed but NOT yet tested. Need to:
1. Rebuild ISO with the sync fixes
2. Run btrfs-single test
3. Verify grub.cfg is not empty after reboot
*** Key Technical Details
- GRUB prefix is (,gpt1)/grub when using --boot-directory=/efi
- grub.cfg must be at /efi/grub/grub.cfg (EFI partition)
- Symlink /boot/grub -> /efi/grub makes grub-btrfs work
- FAT32 needs explicit sync before VM termination
- OVMF_VARS.fd stores EFI boot entries - must preserve between VM stop/start
- Test uses port 2222 for SSH forwarding
*** Debug Commands Used
#+begin_src bash
# Check EFI partition from inside VM:
ls -la /mnt/efi/grub/
cat /mnt/efi/grub/grub.cfg
# Mount installed disk from host:
sudo qemu-nbd -c /dev/nbd0 vm/disk.qcow2
sudo mount /dev/nbd0p1 /tmp/efi-check
cat /tmp/efi-check/grub/grub.cfg
# Check serial log for GRUB output:
cat test-logs/btrfs-single-reboot-serial.log
#+end_src
** Remaining Btrfs Plan Phases
- Phase 4.3: Validation checks - IN PROGRESS (sync fix needs testing)
- Phase 5: CLI tools (archangel-snapshot, archangel-rollback, archangel-list)
- Phase 6: Documentation (README, RESCUE-GUIDE, BTRFS.org)
** Test Status Before Reboot Test Additions
All btrfs tests were passing:
- btrfs-single, btrfs-luks, btrfs-mirror, btrfs-stripe, btrfs-mirror-luks
- ZFS: single-disk, mirror, raidz1
** Next Steps
1. Rebuild ISO (includes sync fixes)
2. Run: ./scripts/test-install.sh btrfs-single
3. If still failing, check serial log and verify grub.cfg has content
4. Once passing, run full btrfs test suite
5. Continue to Phase 5 or 6
** Open Questions / Potential Issues
- Multi-disk btrfs GRUB functions also updated but not tested after sync fix
- grub-btrfsd service might need config for non-standard grub.cfg location
- Rollback test not yet validated (system needs to boot first)
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