Nix is a purely functional package manager that aims to make package management reliable and reproducible.
There are two choices for a Nix installation, one is supported by Arch Linux, and the other is officially supported by Nix.
Install the package.
Upstream installation script
Download the file with
curl --proto '=https' --tlsv1.2 -sSfL https://nixos.org/nix/install -o nix-install.sh, view it:
less ./nix-install.sh, and run the script
./nix-install.sh --daemon to start Nix installation.
curl some-url | sh, as the Nix documentation suggests, is considered as a security risk, because it executes unknown code, that might even be corrupted during the download. Therefore it is recommended to manually download the script and check it, before executing it.
To have the Nix daemon launched at boot time, enable
Add required users to the
nix-users group in order to access the daemon socket.
Add a channel and update it.
$ nix-channel --add https://nixos.org/channels/nixpkgs-unstable $ nix-channel --update
Tips and tricks
With the shell configured, the following should install hello into your updated PATH:
If you installed Nix from the official repositories, you must add the
~/.nix-profile/bin directory to your PATH manually.
$ nix-env -iA nixpkgs.hello
hello and make sure it is in the right PATH. If it works, you can remove it simply by
$ nix-env --uninstall hello
Or you can check the list of installed program by (q stands for query)
$ nix-env -q
You can also check generations by
$ nix-env --list-generations
Check more details in themanual.
By default, nix only uses one builder. The following will allow nix to use as many jobs as the number of CPUs:
max-jobs = auto
nix repl or
nix-env -u as user produces
cannot connect to daemon at '/nix/var/nix/daemon-socket/socket: permission denied
If you just installed nix, you need to reboot.
Too many open files
Some builds may run into an error such as
error: opening directory '/nix/store/...': Too many open files
nix-daemon.service and increase the file limit
Warning message about root user channels
warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring
If the above message shows up when using Nix, the root user will need to update their channels.
# nix-channel --update
Sandbox build issues
There is currently a problem with the
/bin/sh provided by the package FS#73998 where the busybox provided coreutils override the build environment. One workaround is to install the
# nix-build 'channel:nixpkgs-unstable' -A busybox-sandbox-shell --out-link /opt/busybox-nix
and update the nix configuration to use it
sandbox-paths = /bin/sh=/opt/busybox-nix/bin/busybox
Other sandbox issues
error: while setting up the build environment: mounting /proc: Operation not permitted error: program '/usr/bin/nix-env' failed with exit code 1
1: package 'utils' in options("defaultPackages") was not found 2: package 'stats' in options("defaultPackages") was not found Error: .onLoad failed in loadNamespace() for 'utils', details: call: system(paste(which, shQuote(names[i])), intern = TRUE, ignore.stderr = TRUE) error: cannot popen '/nix/store/fnkvlbls29d01jcx3wsdnhykyrl7087r-which-2.21/bin/which 'uname' 2>/dev/null', probable reason 'Cannot allocate memory'
nixpkgsexpects to be built with the sandbox on.
The most common fix is to disable sandboxing in the configuration file, then Restart the
# disable sandboxing sandbox = false