mirror of
https://github.com/Antynea/grub-btrfs.git
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169 lines
6.6 KiB
Markdown
169 lines
6.6 KiB
Markdown
[](https://github.com/Antynea/grub-btrfs/releases)
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## grub-btrfs
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This is a version 4.xx of grub-btrfs
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##### BTC donation address: `1Lbvz244WA8xbpHek9W2Y12cakM6rDe5Rt`
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- - -
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### Description:
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Improves grub by adding "btrfs snapshots" to the grub menu.
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You can boot your system on a "snapshot" from the grub menu.
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Supports manual snapshots, snapper, timeshift ...
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##### Warning: booting on read-only snapshots can be tricky
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If you choose to do it, `/var/log` or even `/var` must be on a separate subvolume.
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Otherwise, make sure your snapshots are writeable.
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See [this ticket](https://github.com/Antynea/grub-btrfs/issues/92) for more info.
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This project includes its own solution.
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Refer to the [documentation](https://github.com/Antynea/grub-btrfs/blob/master/initramfs/readme.md).
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### What features does grub-btrfs v4.xx have?
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* Automatically list snapshots existing on root partition (btrfs).
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* Automatically detect if `/boot` is in separate partition.
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* Automatically detect kernel, initramfs and intel/amd microcode in `/boot` directory on snapshots.
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* Automatically create corresponding "menuentry" in `grub.cfg`
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* Automatically detect the type/tags and descriptions/comments of snapper/timeshift snapshots.
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* Automatically generate `grub.cfg` if you use the provided systemd service.
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- - -
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### Installation:
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#### Arch Linux
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The package is available in the community repository [grub-btrfs](https://archlinux.org/packages/community/any/grub-btrfs/)
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```
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pacman -S grub-btrfs
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```
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#### Gentoo
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grub-btrfs is only available in the Gentoo User Repository (GURU) and not in the official Gentoo repository.
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If you have not activated the GURU yet, do so by running:
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```
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emerge -av app-eselect/eselect-repository
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eselect repository enable guru
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emerge --sync
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```
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Now merge grub-btrfs via
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`emerge app-backup/grub-btrfs`
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#### Kali Linux
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[grub-btrfs](http://pkg.kali.org/pkg/grub-btrfs) is available in the Kali Linux repository and can be installed with:
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```
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apt install grub-btrfs
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```
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Booting into read-only snapshots is fully supported when choosing "btrfs" as file system during a standard Kali Linux installation following [this walk-through](https://www.kali.org/docs/installation/btrfs/).
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#### Manual
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* Run `make install` or look into Makefile for instructions on where to put each file.
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* Run `make help` to check what options are available.
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* Dependencies:
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* [btrfs-progs](https://archlinux.org/packages/core/x86_64/btrfs-progs/)
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* [grub](https://archlinux.org/packages/core/x86_64/grub/)
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* [bash >4](https://archlinux.org/packages/core/x86_64/bash/)
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* [gawk ](https://archlinux.org/packages/core/x86_64/gawk/)
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#### NOTE: All distros
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Generate your grub menu after installation for the changes to take effect.
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For example:
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On **Arch Linux** or **Gentoo** use `grub-mkconfig -o /boot/grub/grub.cfg`.
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On **Fedora** use `grub2-mkconfig -o /boot/grub2/grub.cfg`
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On **Debian-like** distribution `update-grub` is an alias to `grub-mkconfig ...`
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### Customization:
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You have the possibility to modify many parameters in `/etc/default/grub-btrfs/config`.
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See [config file](https://github.com/Antynea/grub-btrfs/blob/master/config) for more information.
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### Automatically update grub upon snapshot:
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To automatically regenerate `grub-btrfs.cfg` when a modification appears in the `/.snapshots` mount point, run
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```bash
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systemctl enable grub-btrfs.path
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systemctl start grub-btrfs.path # In case the mount point is available already
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```
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Monitoring starts automatically when the mount point becomes available.
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#### Snapshots not in `/.snapshots`
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To modify `grub-btrfs.path` run
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```bash
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systemctl edit --full grub-btrfs.path
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systemctl reenable grub-btrfs.path
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```
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To find out the name of the `.mount` unit use `systemctl list-units -t mount`.
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**Timeshift**
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1. Run `systemctl edit --full grub-btrfs.path`
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1. Replace the whole block by:
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```
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[Unit]
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Description=Monitors for new snapshots
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DefaultDependencies=no
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Requires=run-timeshift-backup.mount
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After=run-timeshift-backup.mount
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BindsTo=run-timeshift-backup.mount
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[Path]
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PathModified=/run/timeshift/backup/timeshift-btrfs/snapshots
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[Install]
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WantedBy=run-timeshift-backup.mount
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```
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1. Run `systemctl reenable grub-btrfs.path` to reload the changes you made
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1. Run `systemctl start grub-btrfs.path` to start monitoring.<br>Otherwise, the unit will automatically start monitoring when the mount point will be available.
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Note:
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You can view your change to `systemctl cat grub-btrfs.path`.
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To revert change use `systemctl revert grub-btrfs.path`.
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----
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### Automatically update grub upon restart/boot:
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[Look at this comment](https://github.com/Antynea/grub-btrfs/issues/138#issuecomment-766918328)
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Currently not implemented
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##
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#### OpenRC
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1. If you would like grub-btrfs menu to automatically update when a snapshot is created or deleted:
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* Use `rc-config add grub-btrfsd default`, to start the grub-btrfsd daemon the next time the system boots.
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* To start `grub-btrfsd` right now, run `rc-service grub-btrfsd start`
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* `grub-btrfsd` automatically watches the snapshot directory of timeshift (/run/timeshift/backup/timeshift-btrfs/snapshots)
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and updates the grub-menu when a change occurs.
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* Currently untested for snapper
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2. If you would like grub-btrfs menu to automatically update on system restart/ shutdown:
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Just add the following script as `/etc/local.d/grub-btrfs-update.stop`
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```bash
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#!/bin/bash
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description="Update the grub btrfs snapshots menu"
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name="grub-btrfs-update"
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depend()
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{
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use localmount
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}
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bash -c 'if [ -s "${GRUB_BTRFS_GRUB_DIRNAME:-/boot/grub}/grub-btrfs.cfg" ]; then /etc/grub.d/41_snapshots-btrfs; else {GRUB_BTRFS_MKCONFIG:-grub-mkconfig} -o {GRUB_BTRFS_GRUB_DIRNAME:-/boot/grub}/grub.cfg; fi'
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```
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Make your script executeable with `chmod a+x /etc/local.d/grub-btrfs-update.stop`.
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* The extension ".stop" at the end of the filename indicates to locald that this script should be run at shutdown.
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If you want to run the menu update on startup instead, rename the file to `grub-btrfs-update.start`
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* Works for snapper and timeshift
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##### Warning:
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by default, `grub-mkconfig` command is used.
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Might be `grub2-mkconfig` on some systems (Fedora ...).
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Edit `GRUB_BTRFS_MKCONFIG` variable in `/etc/default/grub-btrfs/config` file to reflect this.
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- - -
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### Special thanks for assistance and contributions
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* [Maxim Baz](https://github.com/maximbaz)
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* [Schievel1](https://github.com/Antynea/grub-btrfs/discussions/173#discussioncomment-1438790)
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* [All contributors](https://github.com/Antynea/grub-btrfs/graphs/contributors)
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