Better instructions on how to reset persistent state in development environment (#2390)

* Better instructions on how to reset persistent state in development environment

Co-authored-by: Niklas Mohrin <dev@niklasmohrin.de>

Author: richardebeling

README.md

@@ -37,6 +37,9 @@ We use [nix](https://nixos.org/) to manage the development environment.
 To stop EvaP or the background services, press `Ctrl-C`.
 To exit the development shell, press `Ctrl-D` or type `exit`.
 
+Inside the development shell, after quitting the background services, you can run the command `clean-setup` to remove persistent state (database, node modules, localsettings).
+Afterwards, `nix run .#services-full` will recreate a default development environment on startup.
+
 ## Contributing
 
 We'd love to see contributions! PRs solving existing issues are most helpful to us. It's best if you ask to be assigned for the issue so we won't have multiple people working on the same issue. Feel free to open issues for bugs, setup problems, or feature requests. If you have other questions, feel free to contact the [organization members](https://github.com/orgs/e-valuation/people). You should probably branch off `main`, the branch `release` is used for stable revisions.

nix/services.nix

@@ -42,7 +42,8 @@
         CUR_HASH=$(nix-hash --flat ./package.json ./package-lock.json | paste -sd " ")
         echo "Hash is $CUR_HASH"
         if [[ -f node_modules/evap-hash && "$CUR_HASH" == "$(cat node_modules/evap-hash)" ]]; then
-            echo "Equal hash found, exiting"
+            echo "Equal node_modules/evap-hash found, exiting."
+            echo "If you want to install a fresh environment, run clean-setup in a nix develop shell."
             exit 0
         fi
         npm ci
@@ -59,7 +60,8 @@
       text = ''
         set -e
         if [[ -f evap/localsettings.py ]]; then
-            echo "Found evap/localsettings.py, exiting"
+            echo "Found evap/localsettings.py, exiting."
+            echo "If you want to install a fresh environment, run clean-setup in a nix develop shell."
             exit 0
         fi
         set -x