Git Hooks: Merge hook scripts and tests from blender-devops

git-hooks/test/deny_binary/functions

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+# Set up temp Git identity if none is set
+setup_temp_git_identity() {
+  export GIT_AUTHOR_NAME="Test User"
+  export GIT_AUTHOR_EMAIL="tests@example.com"
+  export GIT_COMMITTER_NAME="Test User"
+  export GIT_COMMITTER_EMAIL="tests@example.com"
+}
+
+# Get temporary directory where test data will be generated.
+# The function echo's the directory.
+get_tmp_dir() {
+  local SCRIPT=$(readlink -f "$0")
+  local SCRIPT_PATH=$(dirname "$SCRIPT")
+
+  echo "$(dirname ${0})/tmp/$(basename "${SCRIPT%.*}")"
+}
+
+# Setup bare repository which could be used as a server-side upstream.
+# The function echo's the path to the repository.
+setup_bare_origin_repository() {
+  local TMP_DIR=`get_tmp_dir`
+  local REPO_DIR="${TMP_DIR}/origin/test-repo.git"
+  rm -rf "${REPO_DIR}"
+  mkdir -p "${REPO_DIR}"
+  git -C "${REPO_DIR}" init --bare --initial-branch=main > /dev/null 2>&1
+  echo "${REPO_DIR}"
+}
+
+# Install hook to the given bare repository.
+# The bare git repository is provided as $1, hook script is provided as $2,
+# and the hook name is provided as $3.
+install_hook() {
+  local GIT_DIR="${1}"
+  local HOOK_SCRIPT="${2}"
+  local HOOK_NAME="${3}"
+  cp "${HOOK_SCRIPT}" "${GIT_DIR}/hooks/${HOOK_NAME}"
+}
+
+# Clone repository provided via $1. The path to the working directory is
+# echo'd.
+clone_repository() {
+  local TMP_DIR=`get_tmp_dir`
+  local WORK_GIT_DIR="${TMP_DIR}/checkout/test-repo"
+  rm -rf "${WORK_GIT_DIR}"
+  git clone "${1}" "${WORK_GIT_DIR}" > /dev/null 2>&1
+  echo "${WORK_GIT_DIR}"
+}