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|
#!/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" /etc/fstab 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. Delete /etc/synthetic.conf"
echo ""
) >&2
if [ -L "/nix" ]; then
echo "error: /nix is a symlink, please remove it or edit synthetic.conf (requires reboot)" >&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 "$@"
|
