Failed to reinstall on macOS 15.0

[stevalkr]

Platform

• Linux:
• macOS
• WSL

Additional information

I updated to macOS 15.0, and found not able to build flakes. Then I found _nixbld1~_nixbld4 were missing, only _nixbld5~_nixbld32. So I decided to reinstall nix, followed https://nix.dev/manual/nix/2.18/installation/uninstall. Here is my install output.

Output

Switching to the Multi-user Installer
Welcome to the Multi-User Nix Installation

This installation tool will set up your computer with the Nix package
manager. This will happen in a few stages:

1. Make sure your computer doesn't already have Nix. If it does, I
   will show you instructions on how to clean up your old install.

2. Show you what I am going to install and where. Then I will ask
   if you are ready to continue.

3. Create the system users (uids [301..332]) and groups (gid 30000)
   that the Nix daemon uses to run builds. To create system users
   in a different range, exit and run this tool again with
   NIX_FIRST_BUILD_UID set.

4. Perform the basic installation of the Nix files daemon.

5. Configure your shell to import special Nix Profile files, so you
   can use Nix.

6. Start the Nix daemon.

Would you like to see a more detailed list of what I will do?
[y/n] n


---- let's talk about sudo -----------------------------------------------------
This script is going to call sudo a lot. Every time I do, it'll
output exactly what it'll do, and why.

Just like this:

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo echo

to demonstrate how our sudo prompts look


This might look scary, but everything can be undone by running just a
few commands. I used to ask you to confirm each time sudo ran, but it
was too many times. Instead, I'll just ask you this one time:

Can I use sudo?
[y/n] y

Yay! Thanks! Let's get going!

~~> Fixing any leftover Nix volume state
Before I try to install, I'll check for any existing Nix volume config
and ask for your permission to remove it (so that the installer can
start fresh). I'll also ask for permission to fix any issues I spot.

~~> Checking for artifacts of previous installs
Before I try to install, I'll check for signs Nix already is or has
been installed on this system.

---- Nix config report ---------------------------------------------------------
        Temp Dir:	/var/folders/kl/lkkl3v7n07n9gq4wdksmpkc80000gn/T/tmp.7bG0dl18B6
        Nix Root:	/nix
     Build Users:	32
  Build Group ID:	30000
Build Group Name:	nixbld

build users:
    Username:	UID
     _nixbld1:	301
     _nixbld2:	302
     _nixbld3:	303
     _nixbld4:	304
     _nixbld5:	305
     _nixbld6:	306
     _nixbld7:	307
     _nixbld8:	308
     _nixbld9:	309
     _nixbld10:	310
     _nixbld11:	311
     _nixbld12:	312
     _nixbld13:	313
     _nixbld14:	314
     _nixbld15:	315
     _nixbld16:	316
     _nixbld17:	317
     _nixbld18:	318
     _nixbld19:	319
     _nixbld20:	320
     _nixbld21:	321
     _nixbld22:	322
     _nixbld23:	323
     _nixbld24:	324
     _nixbld25:	325
     _nixbld26:	326
     _nixbld27:	327
     _nixbld28:	328
     _nixbld29:	329
     _nixbld30:	330
     _nixbld31:	331
     _nixbld32:	332

Ready to continue?
[y/n] y


---- Preparing a Nix volume ----------------------------------------------------
    Nix traditionally stores its data in the root directory /nix, but
    macOS now (starting in 10.15 Catalina) has a read-only root directory.
    To support Nix, I will create a volume and configure macOS to mount it
    at /nix.

~~> Configuring /etc/synthetic.conf to make a mount-point at /nix

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/bin/ex -u NONE -n /etc/synthetic.conf

to add Nix to /etc/synthetic.conf

Password:

~~> Creating a Nix volume

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/diskutil apfs addVolume disk3 APFS Nix Store -nomount

to create a new APFS volume 'Nix Store' on disk3


---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/diskutil unmount force disk3s7

to ensure the Nix volume is not mounted

disk3s7 was already unmounted

~~> Configuring /etc/fstab to specify volume mount options

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/vifs

to add nix to fstab


~~> Encrypt the Nix volume

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/diskutil mount Nix Store

to mount your Nix volume for encrypting

Volume Nix Store on Nix Store mounted

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/bin/security -i

to add your Nix volume's password to Keychain


---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/diskutil apfs encryptVolume Nix Store -user disk -stdinpassphrase

to actually encrypt your Nix volume

Encrypting with the new "Disk" crypto user on disk3s7
The new "Disk" user will be the only one who has initial access to disk3s7
The new APFS crypto user UUID will be 880945AE-271C-4749-9C9B-29DBDC769549
Encryption has likely completed due to AES hardware; see "diskutil apfs list"

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/diskutil unmount force Nix Store

to unmount the encrypted volume

Volume Nix Store on disk3s7 force-unmounted

~~> Configuring LaunchDaemon to mount 'Nix Store'

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/bin/ex -u NONE -n /Library/LaunchDaemons/org.nixos.darwin-store.plist

to install the Nix volume mounter


---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo launchctl bootstrap system /Library/LaunchDaemons/org.nixos.darwin-store.plist

to launch the Nix volume mounter


---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo launchctl kickstart -k system/org.nixos.darwin-store

to launch the Nix volume mounter


~~> Setting up the build group nixbld

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/sbin/dseditgroup -o create -r Nix build group for nix-daemon -i 30000 nixbld

Create the Nix build group, nixbld

            Created:	Yes

~~> Setting up the build user _nixbld1

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo /usr/bin/dscl . create /Users/_nixbld1 UniqueID 301

Creating the Nix build user (#1), _nixbld1

<main> attribute status: eDSRecordAlreadyExists
<dscl_cmd> DS Error: -14135 (eDSRecordAlreadyExists)

---- oh no! --------------------------------------------------------------------
Oh no, something went wrong. If you can take all the output and open
an issue, we'd love to fix the problem so nobody else has this issue.

:(

We'd love to help if you need it.

You can open an issue at
https://github.com/NixOS/nix/issues/new?labels=installer&template=installer.md

Or get in touch with the community: https://nixos.org/community

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[stevalkr]

Okay sorry my bad, see #10892 and there's a quick fix here #10892 (comment).