tag_release: check for uncommitted changes

Author: tmfink

scripts/tag_release.sh

@@ -6,10 +6,17 @@ set -eu
 
 cd "$(dirname $0)/.."
 
+Error() {
+    echo "Error:" "$@" >&2
+    exit 1
+}
+
 extract_toml_value() {
     grep "^$1" Cargo.toml | sed 's/^[^ =].*=.*"\([^"]\+\)"$/\1/' | head -n1
 }
 
+git diff --exit-code HEAD || Error "Uncommitted changes"
+
 PACKAGE_NAME="$(extract_toml_value name)"
 PACKAGE_VERSION="${PACKAGE_VERSION:-$(extract_toml_value version)}"
 DESCRIPTION="${PACKAGE_NAME} v${PACKAGE_VERSION}"