fix: move pre-commit treefmt hook into CI

The logic inside the hook was rather broken, causing confusing merges,
stashes, and aborts. Unfortunately `treefmt` does not provide a pure
lint option that checks without writing the changes. So instead, we do
this in CI.

.drone.yml

@@ -15,6 +15,8 @@ steps:
     commands:
       - 'echo DEBUG: Using NIX_FLAGS: $NIX_FLAGS'
       - nix $$NIX_FLAGS develop --command nix flake show
+      - nix $$NIX_FLAGS develop --command treefmt --fail-on-change
+      - nix $$NIX_FLAGS develop --command editorconfig-checker
       - nix $$NIX_FLAGS build ".#nixosConfigurations.PubSolarOS.config.system.build.toplevel"
 
 ---
@@ -147,6 +149,6 @@ volumes:
 
 ---
 kind: signature
-hmac: 6aee0ffe22111bb629c0a79940bfbc3fa75f68c5ed5c4bba68abf6797b87a7ab
+hmac: a116f78a0b22188052893bdb46aa40f8de66438826c10ced362ea183d7644d67
 
 ...

.editorconfig

@@ -15,6 +15,9 @@ end_of_line = unset
 insert_final_newline = unset
 trim_trailing_whitespace = unset
 indent_size = unset
+charset = unset
+indent_style = unset
+indent_size = unset
 
 [{.*,secrets}/**]
 end_of_line = unset

CONTRIBUTING.md

@@ -1,24 +1,29 @@
 # Quick branch overview
+
 We work with several branches in this repo. This document aims to explain how
 to contribute changes to the existing branches.
 
 ### `main` branch
+
 - Changes to `modules` and `profiles` should go [the main branch](https://git.pub.solar/pub-solar/os/src/branch/main)
 - Changes can get accepted via: Pull Request
 - Branch protected from direct `git push`
 
 ### `infra` branch
+
 - Changes to the [pub.solar](https://pub.solar) infrastructure should be merged [into this branch](https://git.pub.solar/pub-solar/os/src/branch/infra)
 - Changes can get accepted via: Pull Request
 - Branch protected from direct `git push`
 
 ### `momo/main` branch
+
 - Changes to the [Momo](https://momo.koeln) infrastructure should be merged [into this branch](https://git.pub.solar/pub-solar/os/src/branch/momo/main)
 - Changes can get accepted via: Pull Request
 - Deployment of changes is [automatic via CI pipeline](https://git.pub.solar/pub-solar/os/src/commit/43bd7421509f7cc9ba06d7c740f3f536a4a2af76/.drone.yml#L20-L38)
 - Branch protected from direct `git push`
 
 ### `$USER` branches
+
 - User's custom hosts and changes can be worked on in these branches
 - Direct `git push` possible
 - Examples:

shell/hooks/pre-commit.sh

@@ -1,48 +1,9 @@
 #!/usr/bin/env bash
 
-if git rev-parse --verify HEAD >/dev/null 2>&1; then
-  against=HEAD
-else
-  # Initial commit: diff against an empty tree object
-  against=$(${git}/bin/git hash-object -t tree /dev/null)
-fi
-
-# Stash only unstaged changes, keeping staged changes
-# We have to stash two times, because:
-# --keep-index also stashes the staged changes.
-# The staged changes end up in both the stage AND the stash.
-# https://overflow.hostux.net/questions/7650797/how-to-stash-only-unstaged-changes-in-git#60875082
-old_stash=$(git rev-parse --quiet --verify refs/stash)
-git stash push --quiet --staged --message "Staged changes before pre-commit hook"
-git stash push --quiet --message "Unstaged changes before pre-commit hook"
-if git stash show "stash@{1}" 2>/dev/null; then
-  git stash pop --quiet --index "stash@{1}"
-else
-  git stash pop --quiet --index "stash@{0}"
-fi
-new_stash=$(git rev-parse --quiet --verify refs/stash)
-
-diff="git diff-index --name-only --cached $against --diff-filter d"
-
-mapfile -t all_files < <($diff)
-
-# Format staged files
-if ((${#all_files[@]} != 0)); then
-  treefmt "${all_files[@]}" &&
-    git add "${all_files[@]}"
-fi
-
-# If unstaged changes were stashed re-apply to working tree
-if [ "$old_stash" != "$new_stash" ]; then
-  git stash pop --quiet
-fi
-
 # Check editorconfig
-if ((${#all_files[@]} != 0)); then
-  if ! editorconfig-checker -- "${all_files[@]}"; then
+if ! editorconfig-checker; then
   printf "%b\n" \
     "\nCode is not aligned with .editorconfig" \
     "Review the output and commit your fixes" >&2
   exit 1
 fi
-fi