wip: report package sizes

Added as a comment to the current pull request

.forgejo/workflows/size-report.yml

@@ -0,0 +1,10 @@
+on:
+  pull_request:
+jobs:
+  report-size:
+    runs-on: nixos
+    steps:
+      - uses: "https://git.salame.cl/actions/checkout@v4"
+      - run: nix --version
+      - name: Report Size
+        run: ci-scripts/report-size.sh

.gitignore

@@ -1,4 +1,5 @@
 result
+result-*
 .direnv/
 .pre-commit-config.yaml
 # ignore vm images

ci-scripts/report-size.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+package_size_table() {
+	packages=$(nix flake show --json 2>/dev/null | jq --raw-output '.packages."x86_64-linux" | ".#" + keys[]')
+	# we want to split the words as each of them is a different installable
+	# shellcheck disable=SC2086
+	nix build $packages
+	# shellcheck disable=SC2086
+	table=$(nix path-info --size --closure-size --human-readable \
+		$packages |
+		sed 's/^\(\S\+\)\(\s\+\)\(\S\+\)\(\s\+\)\(\S\+\)$/| \1\2| \3 | \4\5 |/')
+
+	cat <<-EOF
+		| Nix Store Path | NAR Size | Closure Size |
+		|----------------|---------:|-------------:|
+		$table
+	EOF
+}
+
+if [ "$CI" = "true" ]; then
+	echo "Logging in to $GITHUB_SERVER_URL with default token"
+	tea login add --url "$GITHUB_SERVER_URL" --token "$GITHUB_TOKEN"
+	echo "Retrieving PR index for $GITHUB_HEAD_REF"
+	tea pulls -f index,head -o simple
+	pr_index=$(tea pulls -f index,head -o simple | grep "$GITHUB_HEAD_REF" | head -n1 | cut -d' ' -f 1)
+	echo "Retrieved index: $pr_index"
+	echo "Expected PR URL: $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/pulls/$pr_index"
+	tea comment "$pr_index" "$(
+		cat <<-EOF
+			### NixOS Configurations sizes
+
+			TODO
+
+			### Package sizes
+
+			$(package_size_table)
+		EOF
+	)"
+else
+	package_size_table
+fi