Bcachefs: Difference between revisions

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[https://bcachefs.org Bcachefs] is a next-generation CoW filesystem that aims to provide features from [[Btrfs]] and [[ZFS]] with a cleaner codebase, more stability, greater speed and a GPL-compatible license. It is built upon Bcache and is mainly developed by Kent Overstreet.

[https://bcachefs.org Bcachefs] is a next-generation CoW filesystem that aims to provide features from [[Btrfs]] and [[ZFS]] with a cleaner codebase<ref name=":0">citation needed</ref>, more stability<ref name=":0" />, greater speed<ref name=":0" /> and a GPL-compatible license. It is built upon Bcache and is mainly developed by Kent Overstreet.

== Installation ==

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# bcachefs fsck /dev/sda

</syntaxhighlight>Change partition encryption password for <code>/dev/sda1</code><syntaxhighlight lang="console">

# bcachefs set-passphrase /dev/sda1

</syntaxhighlight>

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{

description = "Bcachefs enabled installation media";

inputs.nixos.url = "nixpkgs/nixos-24.05";

inputs.nixos.url = "nixpkgs/nixos-24.11";

outputs = { self, nixos }: {

nixosConfigurations = {

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~~# git init~~

~~# git add flake.nix~~

# nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage

</syntaxhighlight>

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</syntaxhighlight>

~~In case you want to enable filesystem encryption, there's a workaround for [https://github.com/NixOS/nixpkgs/issues/32279 a bug] affecting NixOS 23.11.~~ Formatting and unlocking the encrypted partition would look like this

Formatting and unlocking the encrypted partition would look like this

# nix-~~env~~ -~~iA nixos.~~keyutils

# nix-shell -p keyutils --run 'keyctl link @u @s'

# keyctl link @u @s

# bcachefs format --encrypted /dev/sda2

# bcachefs unlock /dev/sda2

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</syntaxhighlight>

And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.

Note: this is currently broken as per this [https://github.com/NixOS/nixpkgs/issues/317901 github issue]. As a workaround, use `/dev/disk/by-uuid/<UUID>` or `/dev/disk/by-id` instead. This seems to work for single device systems atleast, although atleast at the time of this writing I could not get it to work on my 4+ device raid system.

Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].

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after = [ "local-fs.target" ];

wantedBy = [ "multi-user.target" ];

environment = {

DEVICE_PATH = "/dev/sda1";

MOUNT_POINT = "/mnt";

};

script = ''

#!${pkgs.runtimeShell} -e

${pkgs.keyutils}/bin/keyctl link @u @s

~~while~~ [ ! -b /~~dev~~/~~sda1~~ ]; do

echo "Waiting for ~~/dev/sda1~~ to become available..."

# Check if the device path exists

if [ ! -b "$DEVICE_PATH" ]; then

echo "Error: Device path $DEVICE_PATH does not exist."

exit 1

fi

# Check if the drive is already mounted

if ${pkgs.util-linux}/bin/mountpoint -q "$MOUNT_POINT"; then

echo "Drive already mounted at $MOUNT_POINT. Skipping..."

exit 0

fi

# Wait for the device to become available

while [ ! -b "$DEVICE_PATH" ]; do

echo "Waiting for $DEVICE_PATH to become available..."

sleep 5

done

${pkgs.bcachefs-tools}/bin/bcachefs mount -f /etc/keyfile_test ~~/dev/sda1 /mnt~~

# Mount the device

${pkgs.bcachefs-tools}/bin/bcachefs mount -f /etc/keyfile_test "$DEVICE_PATH" "$MOUNT_POINT"

'';

serviceConfig = {

@@ Line 1: / Line 1: @@
-[https://bcachefs.org Bcachefs] is a next-generation CoW filesystem that aims to provide features from [[Btrfs]] and [[ZFS]] with a cleaner codebase, more stability, greater speed and a GPL-compatible license. It is built upon Bcache and is mainly developed by Kent Overstreet.
+[https://bcachefs.org Bcachefs] is a next-generation CoW filesystem that aims to provide features from [[Btrfs]] and [[ZFS]] with a cleaner codebase<ref name=":0">citation needed</ref>, more stability<ref name=":0" />, greater speed<ref name=":0" /> and a GPL-compatible license. It is built upon Bcache and is mainly developed by Kent Overstreet.
 == Installation ==
@@ Line 88: / Line 88: @@
 <syntaxhighlight lang="console">
 # bcachefs fsck /dev/sda
+</syntaxhighlight>Change partition encryption password for <code>/dev/sda1</code><syntaxhighlight lang="console">
+# bcachefs set-passphrase /dev/sda1
 </syntaxhighlight>
@@ Line 119: / Line 121: @@
 {
    description = "Bcachefs enabled installation media";
-   inputs.nixos.url = "nixpkgs/nixos-24.05";
+   inputs.nixos.url = "nixpkgs/nixos-24.11";
    outputs = { self, nixos }: {
      nixosConfigurations = {
@@ Line 142: / Line 144: @@
 <syntaxhighlight lang="console">
-# git init
-# git add flake.nix
 # nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage
 </syntaxhighlight>
@@ Line 169: / Line 169: @@
 </syntaxhighlight>
-In case you want to enable filesystem encryption, there's a workaround for [https://github.com/NixOS/nixpkgs/issues/32279 a bug] affecting NixOS 23.11. Formatting and unlocking the encrypted partition would look like this
+Formatting and unlocking the encrypted partition would look like this
 <syntaxhighlight lang="console">
-# nix-env -iA nixos.keyutils
+# nix-shell -p keyutils --run 'keyctl link @u @s'
-# keyctl link @u @s
 # bcachefs format --encrypted /dev/sda2
 # bcachefs unlock /dev/sda2
@@ Line 194: / Line 193: @@
 </syntaxhighlight>
 And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.
+Note: this is currently broken as per this [https://github.com/NixOS/nixpkgs/issues/317901 github issue]. As a workaround, use `/dev/disk/by-uuid/<UUID>` or `/dev/disk/by-id` instead. This seems to work for single device systems atleast, although atleast at the time of this writing I could not get it to work on my 4+ device raid system.
 Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].
@@ Line 212: / Line 213: @@
    after = [ "local-fs.target" ];
    wantedBy = [ "multi-user.target" ];
+  environment = {
+    DEVICE_PATH = "/dev/sda1";
+    MOUNT_POINT = "/mnt";
+  };
    script = ''
      #!${pkgs.runtimeShell} -e
      ${pkgs.keyutils}/bin/keyctl link @u @s
-     while [ ! -b /dev/sda1 ]; do
-       echo "Waiting for /dev/sda1 to become available..."
+    # Check if the device path exists
+     if [ ! -b "$DEVICE_PATH" ]; then
+      echo "Error: Device path $DEVICE_PATH does not exist."
+      exit 1
+    fi
+    # Check if the drive is already mounted
+    if ${pkgs.util-linux}/bin/mountpoint -q "$MOUNT_POINT"; then
+      echo "Drive already mounted at $MOUNT_POINT. Skipping..."
+      exit 0
+    fi
+    # Wait for the device to become available
+    while [ ! -b "$DEVICE_PATH" ]; do
+       echo "Waiting for $DEVICE_PATH to become available..."
        sleep 5
      done
-     ${pkgs.bcachefs-tools}/bin/bcachefs mount -f /etc/keyfile_test /dev/sda1 /mnt
+    # Mount the device
+     ${pkgs.bcachefs-tools}/bin/bcachefs mount -f /etc/keyfile_test "$DEVICE_PATH" "$MOUNT_POINT"
    '';
    serviceConfig = {