77 lines
2.4 KiB
Nix
77 lines
2.4 KiB
Nix
{
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
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};
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outputs = {
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self,
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nixpkgs,
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...
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}: let
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# System types to support.
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supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
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# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
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forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
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# Nixpkgs instantiated for supported system types.
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nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
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in {
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devShells = forAllSystems (system: let
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pkgs = nixpkgsFor.${system};
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startPostgres = pkgs.writeScriptBin "postgres_start" ''
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background() {
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exec 0>&-
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exec 1>&-
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exec 2>&-
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exec 3>&-
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"$@" &
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disown $!
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}
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echo "Starting postgres server..."
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# start postgres server
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background ${pkgs.postgresql}/bin/pg_ctl -l $DB_LOG -o "--unix_socket_directories='$PWD'" start
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echo "Postgres server started."
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'';
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in {
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default = pkgs.mkShell {
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buildInputs = with pkgs; [go gopls gotools go-tools postgresql];
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PGDATA = "postgres.db";
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DB_LOG = "postgres.log";
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DB_NAME = "vegan-barcode";
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shellHook = ''
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echo "Using ${pkgs.postgresql.name}."
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create_db=0
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# initialize postgres if we have not done so already
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if [ ! -d $PGDATA ]; then
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echo "Postgres not found. Initializing postgres at $PGDATA"
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${pkgs.postgresql}/bin/initdb > /dev/null
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echo "Setting postgres unix socket directories to $PWD/$SOCKET_DIRECTORIES..."
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echo "unix_socket_directories = '$PWD'" >> $PGDATA/postgresql.conf
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echo "unix socket directories set."
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echo "Creating database $DB_NAME..."
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echo "CREATE DATABASE \"$DB_NAME\";" | postgres --single -E postgres
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echo "Database created."
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fi
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export PGHOST="$PWD"
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if [ ! -f "$PWD/.s.PGSQL.5432.lock" ]; then
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${startPostgres}/bin/postgres_start
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fi
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'';
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};
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});
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# The default package for 'nix build'. This makes sense if the
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# flake provides only one package or there is a clear "main"
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# package.
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defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
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};
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}
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