Extract running the reuse code into a reusable pre-commit hook

.pre-commit-config.yaml

@@ -37,8 +37,9 @@ repos:
 
   - repo: local
     hooks:
-      - id: reuse annotate
+      # Keep in sync with .pre-commit-hooks.yaml, too much hazzle to reuse the same hook definition
+      - id: reuse-annotate
         name: Check and fix copyright headers with reuse annotate
         entry: ./scripts/run_reuse_annotate.sh
-        language: system
+        language: unsupported_script
         pass_filenames: false

.pre-commit-hooks.yaml

@@ -0,0 +1,22 @@
+---
+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-FileCopyrightText: 2026 Contributors to the Eclipse Foundation
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+  # Keep in sync with .pre-commit-config.yaml, too much hazzle to reuse the same hook definition
+  - id: reuse-annotate
+    name: Check and fix copyright headers with reuse annotate
+    entry: scripts/run_reuse_annotate.sh
+    language: unsupported_script
+    pass_filenames: false
+    minimum_pre_commit_version: 3.2.0

scripts/run_reuse_annotate.sh

@@ -19,17 +19,23 @@ set -euxo pipefail
 SCRIPT_PATH=$(readlink -f "$0")
 SCRIPT_DIR=$(dirname -- "${SCRIPT_PATH}")
 
-pushd "${SCRIPT_DIR}/.." > /dev/null
-
-files_to_annotate=$(git ls-files)
-
 # remove deleted files from the list of files to annotate
 deleted_files=$(git ls-files --deleted)
-files_to_annotate=$(comm -23 <(git ls-files | sort) <(echo "${deleted_files}" | sort))
+files_to_annotate_rel=$(comm -23 <(git ls-files | sort) <(echo "${deleted_files}" | sort))
+
+# absolute paths are needed, when used via .pre-commit-hooks.yaml by other repositories
+root="$(pwd)"
+files_to_annotate=""
+for file in ${files_to_annotate_rel}; do
+    files_to_annotate+="${root}/${file} "
+done
+
+# Use .reuse/templates specified at the devcontainer / source of pre-commit hook
+pushd "${SCRIPT_DIR}/.." > /dev/null
 
 # shellcheck disable=SC2086
 # Expansion of ${files_to_annotate} is intentional to pass the list of files as separate arguments to the reuse annotate command.
-pipx run reuse annotate --template apache-2.0 --merge-copyrights --recursive --skip-unrecognised \
+"${PIPX_BIN_DIR}/pipx" run reuse annotate --template apache-2.0 --merge-copyrights --recursive --skip-unrecognised \
  --copyright="Contributors to the Eclipse Foundation" --license=Apache-2.0 ${files_to_annotate}
 
 popd > /dev/null