d68fdf5fff
Script: Improves the rootflags option in the kernel command line: - Remove "rw" flag. - Parse fstab mountoptions and add them to rootflags: Adds functionality to read in snapshot specific mount flags from the respective fstab and uses them in combination with the new config option, while the latter is prioritized. Both places can, but don't need to define mount flags. If either of them doesn't, it will simply not be taken into account. Config file: Adds a new config variable "GRUB_BTRFS_ROOTFLAGS": - The new variable is used to include user-defined rootflags in the kernel command line of generated snapshot bootmenu entries. See config file for more infos.
grub-btrfs
This is a version 4.xx of grub-btrfs
BTC donation address: 1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt
Description
Improves Grub by adding "btrfs snapshots" to the Grub menu.
You can start your system on a "snapshot" from the Grub menu.
Supports manual snapshots, snapper, timeshift ...
Warning: booting on read-only snapshots can be tricky
If you choose to do it, /var/log or even /var must be on a separate subvolume.
Otherwise, make sure your snapshots are writeable.
See this ticket for more info.
This project includes its own solution.
Refer to the documentation.
What does grub-btrfs v4.xx do :
- Automatically List snapshots existing on root partition (btrfs).
- Automatically Detect if "/boot" is in separate partition.
- Automatically Detect kernel, initramfs and intel/amd microcode in "/boot" directory on snapshots.
- Automatically Create corresponding "menuentry" in
grub.cfg - Automatically detect snapper and use snapper's snapshot description if available.
- Automatically generate
grub.cfgif you use the provided systemd service.
Installation :
Arch Linux
pacman -S grub-btrfs
Manual
- Run
make installor look into Makefile for instructions on where to put each file.
NOTE: Generate your Grub menu after installation for the changes to take effect.
On Arch Linux use grub-mkconfig -o /boot/grub/grub.cfg.
Customization:
You have the possibility to modify many parameters in /etc/default/grub-btrfs/config.
See config file for more information.
Automatically update grub
If you would like Grub to automatically update when a snapshot is made or deleted:
- Use
systemctl start/enable grub-btrfs.path. grub-btrfs.pathautomatically (re)generatesgrub.cfgwhen a modification appears in/.snapshotsfolder (by default).- If your snapshots aren't mounted in
/.snapshots, you must modify the watch folder usingsystemctl edit grub-btrfs.path.-
For example: Timeshift mount its snapshots in
/run/timeshift/backup/timeshift-btrfs/snapshotsfolder.Use
systemctl edit grub-btrfs.path. Then wrote:[Path] PathModified=/run/timeshift/backup/timeshift-btrfs/snapshotsand finally save.
-
You can view your change to
systemctl cat grub-btrfs.path. -
To revert change use
systemctl revert grub-btrfs.path.
-
Warning:
by default, grub-mkconfig command is used.
Might be grub2-mkconfig on some systems (Fedora ...).
Edit GRUB_BTRFS_MKCONFIG variable in /etc/default/grub-btrfs/config file to reflect this.