}

How to use nix with catalina

Created:

For using nix with Catalina you will need to create a volume and configure it to mount at /nix.

  1. Execute the script to create the volume (contents at the end of this article):

bash create-nix-volume.sh eval(ez_write_tag([[970,90],'tutorials_technology-medrectangle-3','ezslot_0',114,'0','0']));

  1. Next, disable spotlight indexing of the volume:

sudo mdutil -i off /nix

The script to create the volume is here (create-nix-volume.sh) :

!/bin/sh

set -e

root_disk() { diskutil info -plist / }

apfs_volumes_for() { disk=$1 diskutil apfs list -plist "$disk" }

disk_identifier() { xpath "/plist/dict/key[text()='ParentWholeDisk']/following-sibling::string[1]/text()" 2>/dev/null }

volume_get() { key=$1 i=$2 xpath "/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict[$i]/key[text()='$key']/following-sibling::string[1]/text()" 2> /dev/null }

find_nix_volume() { disk=$1 i=1 volumes=$(apfs_volumes_for "$disk") while true; do name=$(echo "$volumes" | volume_get "Name" "$i") if [ -z "$name" ]; then break fi case "$name" in [Nn]ix*) echo "$name" break ;; esac i=$((i+1)) done }

test_fstab() { grep -q "/nix apfs rw" /etc/fstab 2>/dev/null }

test_nix_symlink() { [ -L "/nix" ] || grep -q "^nix." /etc/synthetic.conf 2>/dev/null }

test_synthetic_conf() { grep -q "^nix$" /etc/synthetic.conf 2>/dev/null }

test_nix() { test -d "/nix" }

main() { ( echo "" echo " ------------------------------------------------------------------ " echo " | This installer will create a volume for the nix store and |" echo " | configure it to mount at /nix. Follow these steps to uninstall. |" echo " ------------------------------------------------------------------ " echo "" echo " 1. Remove the entry from fstab using 'sudo vifs'" echo " 2. Destroy the data volume using 'diskutil apfs deleteVolume'" echo " 3. Remove the 'nix' line from /etc/synthetic.conf or the file" echo "" ) >&2

if test_nix_symlink; then echo "error: /nix is a symlink, please remove it and make sure it's not in synthetic.conf (in which case a reboot is required)" >&2 echo " /nix -> $(readlink "/nix")" >&2 exit 2 fi

if ! test_synthetic_conf; then echo "Configuring /etc/synthetic.conf..." >&2 echo nix | sudo tee /etc/synthetic.conf if ! test_synthetic_conf; then echo "error: failed to configure synthetic.conf" >&2 exit 1 fi fi

if ! test_nix; then echo "Creating mountpoint for /nix..." >&2 /System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util -B || true if ! test_nix; then sudo mkdir -p /nix 2>/dev/null || true fi if ! test_nix; then echo "error: failed to bootstrap /nix, a reboot might be required" >&2 exit 1 fi fi

disk=$(root_disk | disk_identifier) volume=$(find_nix_volume "$disk") if [ -z "$volume" ]; then echo "Creating a Nix Store volume..." >&2 sudo diskutil apfs addVolume "$disk" APFS 'Nix Store' -mountpoint /nix volume="Nix Store" else echo "Using existing '$volume' volume" >&2 fi

if ! test_fstab; then echo "Configuring /etc/fstab..." >&2 label=$(echo "$volume" | sed 's/ /\040/g') printf "\$a\nLABEL=%s /nix apfs rw,nobrowse\n.\nwq\n" "$label" | EDITOR=ed sudo vifs fi

echo "" >&2 echo "The following options can be enabled to disable spotlight indexing" >&2 echo "of the volume, which might be desirable." >&2 echo "" >&2 echo " $ sudo mdutil -i off /nix" >&2 echo "" >&2 }

main "[email protected]"

Reference: https://raw.githubusercontent.com/LnL7/nix/darwin-10.15-install/scripts/create-darwin-volume.sh

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