I just switched one of my systems over to NixOS from Arch and so far it seems interesting. One question I had is regarding the nix-shell. So I get the basic concept of it and that it allows creating a shell that has packages installed with that shell making ideal for dev environments. I’ve even seen talks where the suggest nix-shells over docker/podman, my question is how is persistent data (like databases) handled?
Okay, hopefully someone here can point out where I am going wrong with setting up my dev shell the way I want. I am currently using
direnv
andnix-direnv
to manage the dev shell, and I found this blog post which shows a way to start and stop MySQL/Mariadb but I am having some weird issues with it.Currently my flake looks like this:
{ description = "A basic flake with a shell"; inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; inputs.flake-utils.url = "github:numtide/flake-utils"; outputs = { nixpkgs, flake-utils, ... }@inputs: flake-utils.lib.eachDefaultSystem (system: let pkgs = nixpkgs.legacyPackages.${system}; in { devShells.default = pkgs.mkShell { packages = with pkgs; [ bashInteractive php ]; buildInputs = [ pkgs.mariadb ]; shellHook = '' export MYSQL_BASEDIR=${pkgs.mariadb} export MYSQL_HOME=$PWD/.direnv/mysql export MYSQL_DATADIR=$MYSQL_HOME/data export MYSQL_UNIX_PORT=$MYSQL_HOME/mysql.sock export MYSQL_PID_FILE=$MYSQL_HOME/mysql.pid alias mysql='mysql -u root' if [[ ! -d $MYSQL_HOME ]]; then mariadb-install-db --auth-root-authentication-method=normal \ --datadir="$MYSQL_DATADIR" --basedir="$MYSQL_BASEDIR" \ --pid-file="$MYSQL_PID_FILE" fi mariadbd --datadir=$MYSQL_DATADIR --pid-file=$MYSQL_PID_FILE \ --socket=$MYSQL_UNIX_PORT --tmpdir='/tmp' 2>/dev/null & MYSQL_PID=$! ''; }; }); }
When I run it like this
mariadbd
starts just fine, but doesn’t get backgrounded dispite the&
making that shell session useless which is not what I want as I have to spawn a second shell just to do anything.Even weirder is when I add the
finish()
function and the call totrap
like in the blog post thenmariadbd
doesn’t start (or starts and immedently gets killed).mariadb
doesn’t get backgrounded? Are you sure? Are you able to type commands and see their output? Also, what happens when puttingset -x
at the start of your shell hook? You should see the last line printed e.gMYSQL_PID=12345
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