Show a better error message when %pyproject_install finds no wheel

Fixes: https://bugzilla.redhat.com/2242452

macros.pyproject

@@ -65,6 +65,10 @@ echo $(IFS=:; echo "${pyproject_build_lib[*]}")
 
 %pyproject_install() %{expand:\\\
 specifier=$(ls %{_pyproject_wheeldir}/*.whl | xargs basename --multiple | sed -E 's/([^-]+)-([^-]+)-.+\\\.whl/\\\1==\\\2/')
+if [ -z $specifier ]; then
+  echo 'ERROR: %%%%pyproject_install found no wheel in %%%%{_pyproject_wheeldir} %{_pyproject_wheeldir}' >&2
+  exit 1
+fi
 TMPDIR="%{_pyproject_builddir}" %{__python3} -m pip install --root %{buildroot} --prefix %{_prefix} --no-deps --disable-pip-version-check --progress-bar off --verbose --ignore-installed --no-warn-script-location --no-index --no-cache-dir --find-links %{_pyproject_wheeldir} $specifier
 if [ -d %{buildroot}%{_bindir} ]; then
   %py3_shebang_fix %{buildroot}%{_bindir}/*

pyproject-rpm-macros.spec

@@ -177,6 +177,8 @@ export HOSTNAME="rpmbuild"  # to speedup tox in network-less mock, see rhbz#1856
 - The -L flag explicitly disables this check (which remains the default)
 - Prevent incorrect usage of %%pyproject_buildrequires -R with -x/-e/-t
 - Fixes: rhbz#2244282
+- Show a better error message when %%pyproject_install finds no wheel
+- Fixes: rhbz#2242452
 
 * Wed Sep 13 2023 Python Maint <python-maint@redhat.com> - 1.10.0-1
 - Add %%_pyproject_check_import_allow_no_modules for automated environments