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Nix Notes

Nice Tutorial

Use this tutorial to get started with Nix

https://gricad.github.io/calcul/nix/tuto/2017/07/04/nix-tutorial.html#install-nix-single-user-mode

Issues

error setting certificate verify locations

Sometimes installing Nix with older versions of linux gives

curl: (77) error setting certificate verify locations:

use

$ export CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt

to fix this.

Install in non-standard location

Read this.

Basically, put export NIX_IGNORE_SYMLINK_STORE=1 at the end of nix.sh and before running the install script. Use ln -s /path/to/nix /nix before installing nix.

If you already have Nix

$ nix-env -S /nix/var/nix/profiles/default
$ curl https://nixos.org/nix/install | sh

After Installing

Set up Nix so that you just need to do source ~/nix.sh to use it

$ cp ~/.nix-profile/etc/profile.d/nix.sh ~/nix.sh

Update permisssions:

$ chmod +w ~/nix.sh

Do this for purity:

$ echo -e "unset PATH\n$(cat ~/nix.sh)" > ~/nix.sh

Also add this env variable, which is useful:

$ echo "export NIX_USER_PROFILE_DIR=/nix/var/nix/profiles/per-user/\$USER " >> ~/nix.sh

Update the path again

$ echo "export PATH=\$PATH/nix/var/nix/profiles/default/bin:/bin:/usr/bin" >> ~/nix.sh

More changes

These don't seem necessary since Nix 2.0.

Set up the man pages correctly:

$ echo "export MANPATH=/nix/var/nix/profiles/default/share/man:\$HOME/.nix-profile/share/man:\$MANPATH" >> ~/nix.sh

and

$ echo "export LC_ALL=C"

To start using Nix use

$ source ~/nix.sh

Profiles

To start use an old profile or start a new one use

$ nix-env --switch-profile $NIX_USER_PROFILE_DIR/<profile-name>

To see which profile you are currently using

$ ls -altr ~/.nix-profile

To see a list of all possible profiles

$ ls -al $NIX_USER_PROFILE_DIR

To clone a profile use

$ cp -r $NIX_USER_PROFILE_DIR/<profile-name> $NIX_USER_PROFILE_DIR/<new-profile-name>

This seems to work, but I can't find documentation for this. It doesn't have any generations but makes a new generation after something is installed

Generations

How to roll back

$ nix-env --list-generations

to go to a particular generation

$ nix-env --switch-generation <generation-number>

Packages

List packages

$ nix-env -q

Install nix-env -i <package> and uninstall nix-env -e <package>.

Building a Package

To build use

$ nix-build builder.nix

and to install

$ nix-env -i ./result

and to debug

$ nix-shell --pure builder.nix