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# UGE / L2 / Intro to relational databases / Python project prototype
# Author: Pacien TRAN-GIRARD
# Licence: EUPL-1.2
{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05";
flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system:
with import nixpkgs { inherit system; };
let
develPackagesAndScripts = [
postgresql_13 # PostgreSQL server with the standard admin tools.
# More pleasant alternative to psql, with colours and auto-completion.
# Custom configuration to suppress irrelevant warnings and messages.
(writeShellScriptBin "pgcli" ''
${pgcli}/bin/pgcli --pgclirc "${writeText "pgclirc" ''
[main]
keyring = False
less_chatty = True
''}" "$@"
'')
# Script for initialising an independent development database.
# This creates a default empty database name "postgres" and owned by the
# current user. Data are stored in ./development_database/pgdata.
(writeShellScriptBin "dev-initdb" ''
initdb \
--no-locale \
--encoding UTF8 \
--auth-host reject \
--auth-local peer \
"$@"
'')
# Script for starting an independent development posgresql server.
# Accepts connections only through a local UNIX-domain socket.
(writeShellScriptBin "dev-postgres" ''
postgres \
-h "" \
-k "$PGHOST" \
-d 2 \
"$@"
'')
];
exportEnvVar = k: v: ''export ${k}="${v}"; echo ${k}=\"${v}\"'';
exportDevelEnvVars = lib.mapAttrsToList exportEnvVar develEnvVars;
develEnvVars = rec {
PGDATA = "$PWD/development_database/pgdata";
PGHOST = "$PWD/development_database";
PGPORT = "5432";
PGDATABASE = "app";
};
in {
devShell = mkShell rec {
buildInputs = develPackagesAndScripts;
shellHook = ''
echo -e "\nDEVSHELL ENVIRONMENT VARIABLES:"
${lib.concatStringsSep "\n" exportDevelEnvVars}
echo -e "\nDEVSHELL COMMANDS:"
ls "${symlinkJoin { name = "env"; paths = buildInputs; }}/bin"
# Use the default user shell instead of Bash
$(${finger_bsd}/bin/finger $USER \
| ${gnugrep}/bin/grep -oP 'Shell: \K.*')
exit $?
'';
};
});
}
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