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doc: Add detailed uninstall section for macOS #6144

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doc: Add detailed uninstall section for macOS #6144

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doc: Add detailed uninstall section for macOS
toonn Feb 22, 2022
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doc: Add macOS uninstall note about /nix
toonn Feb 25, 2022
2df23e2
doc: Drop nix-darwin service from macOS uninstall
toonn Feb 25, 2022
947d476
doc: Add removal of darwin-store LaunchDaemon
toonn Feb 26, 2022
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92 changes: 87 additions & 5 deletions doc/manual/src/installation/installing-binary.md
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Expand Up @@ -84,7 +84,9 @@ The installer will modify `/etc/bashrc`, and `/etc/zshrc` if they exist.
The installer will first back up these files with a `.backup-before-nix`
extension. The installer will also create `/etc/profile.d/nix.sh`.

You can uninstall Nix with the following commands:
## Uninstalling

### Linux

```console
sudo rm -rf /etc/profile/nix.sh /etc/nix /nix ~root/.nix-profile ~root/.nix-defexpr ~root/.nix-channels ~/.nix-profile ~/.nix-defexpr ~/.nix-channels
Expand All @@ -95,15 +97,95 @@ sudo systemctl stop nix-daemon.service
sudo systemctl disable nix-daemon.socket
sudo systemctl disable nix-daemon.service
sudo systemctl daemon-reload

# If you are on macOS, you will need to run:
sudo launchctl unload /Library/LaunchDaemons/org.nixos.nix-daemon.plist
sudo rm /Library/LaunchDaemons/org.nixos.nix-daemon.plist
```

There may also be references to Nix in `/etc/profile`, `/etc/bashrc`,
and `/etc/zshrc` which you may remove.

### macOS

1. Edit `/etc/zshrc` and `/etc/bashrc` to remove the lines sourcing
`nix-daemon.sh`, which should look like this:

```bash
# Nix
if [ -e '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh' ]; then
. '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'
fi
# End Nix
```

If these files haven't been altered since installing Nix you can simply put
the backups back in place:

```console
sudo mv /etc/zshrc.backup-before-nix /etc/zshrc
sudo mv /etc/bashrc.backup-before-nix /etc/bashrc
```

This will stop shells from sourcing the file and bringing everything you
installed using Nix in scope.

2. Stop and remove the Nix daemon services:

```console
sudo launchctl unload /Library/LaunchDaemons/org.nixos.nix-daemon.plist
sudo rm /Library/LaunchDaemons/org.nixos.nix-daemon.plist
sudo launchctl unload /Library/LaunchDaemons/org.nixos.darwin-store.plist
sudo rm /Library/LaunchDaemons/org.nixos.darwin-store.plist
```

This stops the Nix daemon and prevents it from being started next time you
boot the system.

3. Remove the `nixbld` group and the `_nixbuildN` users:

```console
sudo dscl . -delete /Groups/nixbld
for u in $(sudo dscl . -list /Users | grep _nixbld); do sudo dscl . -delete /Users/$u; done
```

This will remove all the build users that no longer serve a purpose.

4. Edit fstab using `sudo vifs` to remove the line mounting the Nix Store
volume on `/nix`, which looks like this,
`LABEL=Nix\040Store /nix apfs rw,nobrowse`. This will prevent automatic
mounting of the Nix Store volume.

5. Edit `/etc/synthetic.conf` to remove the `nix` line. If this is the only
line in the file you can remove it entirely, `sudo rm /etc/synthetic.conf`.
This will prevent the creation of the empty `/nix` directory to provide a
mountpoint for the Nix Store volume.

6. Remove the files Nix added to your system:

```console
sudo rm -rf /etc/nix /var/root/.nix-profile /var/root/.nix-defexpr /var/root/.nix-channels ~/.nix-profile ~/.nix-defexpr ~/.nix-channels
```

This gets rid of any data Nix may have created except for the store which is
removed next.

7. Remove the Nix Store volume:

```console
sudo diskutil apfs deleteVolume /nix
```

This will remove the Nix Store volume and everything that was added to the
store.

> **Note**
>
> After you complete the steps here, you will still have an empty `/nix`
> directory. This is an expected sign of a successful uninstall. The empty
> `/nix` directory will disappear the next time you reboot.
>
> You do not have to reboot to finish uninstalling Nix. The uninstall is
> complete. macOS (Catalina+) directly controls root directories and its
> read-only root will prevent you from manually deleting the empty `/nix`
> mountpoint.

# macOS Installation <a name="sect-macos-installation-change-store-prefix"></a><a name="sect-macos-installation-encrypted-volume"></a><a name="sect-macos-installation-symlink"></a><a name="sect-macos-installation-recommended-notes"></a>
<!-- Note: anchors above to catch permalinks to old explanations -->

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