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Revamp uninstallation docs
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Luc Perkins
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1 changed files with 5 additions and 146 deletions
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# Uninstalling Nix
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## Multi User
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Removing a [multi-user installation](./installing-binary.md#multi-user-installation) depends on the operating system.
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### Linux
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If you are on Linux with systemd:
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1. Remove the Nix daemon service:
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To uninstall Determinate Nix, use the uninstallation utility built into the [Determinate Nix Installer][installer]:
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```console
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sudo systemctl stop nix-daemon.service
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sudo systemctl disable nix-daemon.socket nix-daemon.service
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sudo systemctl daemon-reload
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$ /nix/nix-installer uninstall
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```
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Remove files created by Nix:
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If you're certain that you want to uninstall, you can skip the confirmation step:
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```console
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sudo rm -rf /etc/nix /etc/profile.d/nix.sh /etc/tmpfiles.d/nix-daemon.conf /nix ~root/.nix-channels ~root/.nix-defexpr ~root/.nix-profile ~root/.cache/nix
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$ /nix/nix-installer uninstall --no-confirm
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```
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Remove build users and their group:
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```console
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for i in $(seq 1 32); do
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sudo userdel nixbld$i
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done
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sudo groupdel nixbld
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```
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There may also be references to Nix in
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- `/etc/bash.bashrc`
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- `/etc/bashrc`
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- `/etc/profile`
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- `/etc/zsh/zshrc`
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- `/etc/zshrc`
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which you may remove.
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### macOS
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> **Updating to macOS 15 Sequoia**
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>
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> If you recently updated to macOS 15 Sequoia and are getting
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> ```console
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> error: the user '_nixbld1' in the group 'nixbld' does not exist
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> ```
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> when running Nix commands, refer to GitHub issue [NixOS/nix#10892](https://github.com/NixOS/nix/issues/10892) for instructions to fix your installation without reinstalling.
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1. If system-wide shell initialisation files haven't been altered since installing Nix, use the backups made by the installer:
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```console
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sudo mv /etc/zshrc.backup-before-nix /etc/zshrc
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sudo mv /etc/bashrc.backup-before-nix /etc/bashrc
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sudo mv /etc/bash.bashrc.backup-before-nix /etc/bash.bashrc
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```
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Otherwise, edit `/etc/zshrc`, `/etc/bashrc`, and `/etc/bash.bashrc` to remove the lines sourcing `nix-daemon.sh`, which should look like this:
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```bash
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# Nix
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if [ -e '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh' ]; then
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. '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'
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fi
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# End Nix
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```
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2. Stop and remove the Nix daemon services:
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```console
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sudo launchctl unload /Library/LaunchDaemons/org.nixos.nix-daemon.plist
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sudo rm /Library/LaunchDaemons/org.nixos.nix-daemon.plist
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sudo launchctl unload /Library/LaunchDaemons/org.nixos.darwin-store.plist
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sudo rm /Library/LaunchDaemons/org.nixos.darwin-store.plist
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```
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This stops the Nix daemon and prevents it from being started next time you boot the system.
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3. Remove the `nixbld` group and the `_nixbuildN` users:
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```console
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sudo dscl . -delete /Groups/nixbld
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for u in $(sudo dscl . -list /Users | grep _nixbld); do sudo dscl . -delete /Users/$u; done
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```
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This will remove all the build users that no longer serve a purpose.
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4. Edit fstab using `sudo vifs` to remove the line mounting the Nix Store volume on `/nix`, which looks like
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```
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UUID=<uuid> /nix apfs rw,noauto,nobrowse,suid,owners
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```
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or
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```
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LABEL=Nix\040Store /nix apfs rw,nobrowse
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```
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by setting the cursor on the respective line using the arrow keys, and pressing `dd`, and then `:wq` to save the file.
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This will prevent automatic mounting of the Nix Store volume.
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5. Edit `/etc/synthetic.conf` to remove the `nix` line.
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If this is the only line in the file you can remove it entirely:
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```bash
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if [ -f /etc/synthetic.conf ]; then
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if [ "$(cat /etc/synthetic.conf)" = "nix" ]; then
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sudo rm /etc/synthetic.conf
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else
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sudo vi /etc/synthetic.conf
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fi
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fi
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```
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This will prevent the creation of the empty `/nix` directory.
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6. Remove the files Nix added to your system, except for the store:
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```console
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sudo rm -rf /etc/nix /var/root/.nix-profile /var/root/.nix-defexpr /var/root/.nix-channels ~/.nix-profile ~/.nix-defexpr ~/.nix-channels
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```
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7. Remove the Nix Store volume:
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```console
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sudo diskutil apfs deleteVolume /nix
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```
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This will remove the Nix Store volume and everything that was added to the store.
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If the output indicates that the command couldn't remove the volume, you should make sure you don't have an _unmounted_ Nix Store volume.
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Look for a "Nix Store" volume in the output of the following command:
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```console
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diskutil list
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```
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If you _do_ find a "Nix Store" volume, delete it by running `diskutil apfs deleteVolume` with the store volume's `diskXsY` identifier.
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If you get an error that the volume is in use by the kernel, reboot and immediately delete the volume before starting any other process.
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> **Note**
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>
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> After you complete the steps here, you will still have an empty `/nix` directory.
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> This is an expected sign of a successful uninstall.
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> The empty `/nix` directory will disappear the next time you reboot.
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>
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> You do not have to reboot to finish uninstalling Nix.
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> The uninstall is complete.
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> macOS (Catalina+) directly controls root directories, and its read-only root will prevent you from manually deleting the empty `/nix` mountpoint.
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[installer]: https://github.com/DeterminateSystems/nix-installer
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