feat: update dates in BUSL license on release commit

Update the year and the date when we do `./hack/release.sh commit <TAG>`.

Signed-off-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>

internal/output/release/release.sh

@@ -38,9 +38,89 @@ function commit {
     exit 1
   fi
 
+  if is_on_main_branch; then
+    update_license_files
+  fi
+
   git commit -s -m "release($1): prepare release" -m "This is the official $1 release."
 }
 
+function is_on_main_branch {
+  main_remotes=("upstream" "origin")
+  branch_names=("main" "master")
+  current_branch=$(git rev-parse --abbrev-ref HEAD)
+
+  echo "Check current branch: $current_branch"
+
+  for remote in "${main_remotes[@]}"; do
+    echo "Fetch remote $remote..."
+
+    if ! git fetch --quiet "$remote" &>/dev/null; then
+      echo "Failed to fetch $remote, skip..."
+
+      continue
+    fi
+
+    for branch_name in "${branch_names[@]}"; do
+      if ! git rev-parse --verify "$branch_name" &>/dev/null; then
+        echo "Branch $branch_name does not exist, skip..."
+
+        continue
+      fi
+
+      echo "Branch $remote/$branch_name exists, comparing..."
+
+      merge_base=$(git merge-base "$current_branch" "$remote/$branch_name")
+      latest_main=$(git rev-parse "$remote/$branch_name")
+
+      if [ "$merge_base" = "$latest_main" ]; then
+        echo "Current branch is up-to-date with $remote/$branch_name"
+
+        return 0
+      else
+        echo "Current branch is not on $remote/$branch_name"
+
+        return 1
+      fi
+    done
+  done
+
+  echo "No main or master branch found on any remote"
+
+  return 1
+}
+
+function update_license_files {
+    script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    parent_dir="$(dirname "$script_dir")"
+    current_year=$(date +"%Y")
+    change_date=$(date -v+4y +"%Y-%m-%d" 2>/dev/null || date -d "+4 years" +"%Y-%m-%d" 2>/dev/null || date --date="+4 years" +"%Y-%m-%d")
+
+    # Find LICENSE files recursively in the parent directory
+    find "$parent_dir" -type f -name "LICENSE" | while read -r file; do
+        # Check if file starts with "Business Source License"
+        if grep -q "^Business Source License" "$file"; then
+            # Create a temporary file
+            temp_file="${file}.tmp"
+
+            # Update the year and the change date
+            sed -e "s/The Licensed Work is (c) [0-9]\{4\}/The Licensed Work is (c) $current_year/" \
+                -e "s/Change Date:          [0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}/Change Date:          $change_date/" \
+                "$file" > "$temp_file"
+
+            # Check if the file has changed
+            if ! cmp -s "$file" "$temp_file"; then
+                mv "$temp_file" "$file"
+                echo "Updated: $file"
+                git add "$file"
+            else
+                echo "No changes: $file"
+                rm "$temp_file"
+            fi
+        fi
+    done
+}
+
 if declare -f "$1" > /dev/null
 then
   cmd="$1"
@@ -49,7 +129,7 @@ then
 else
   cat <<EOF
 Usage:
-  commit:        Create the official release commit message.
+  commit:        Create the official release commit message (updates BUSL license dates if there is any).
   cherry-pick:   Cherry-pick a commit into a release branch.
   changelog:     Update the specified CHANGELOG.
   release-notes: Create release notes for GitHub release.