Fix %%py_shebang_flags handling within %%py_check_import

%%py{3}_check_import now respects the custom setting of %%py{3}_shebang_flags
and invokes Python with the respective values.
If %%py{3}_shebang_flags is undefined or set to no value,
there no flags are passed to Python on invoke.
Resolves: rhbz#2018615

macros.python

@@ -70,6 +70,7 @@
 
 # With $PATH and $PYTHONPATH set to the %%buildroot,
 # try to import the Python module(s) given as command-line args or read from file (-f).
+# Respect the custom values of %%py_shebang_flags or set nothing if it's undefined.
 # Filter and check import on only top-level modules using -t flag.
 # Exclude unwanted modules by passing their globs to -e option.
 # Useful as a smoke test in %%check when running tests is not feasible.
@@ -79,11 +80,17 @@
   PATH="%{buildroot}%{_bindir}:$PATH"\\\
   PYTHONPATH="${PYTHONPATH:-%{buildroot}%{python_sitearch}:%{buildroot}%{python_sitelib}}"\\\
   PYTHONDONTWRITEBYTECODE=1\\\
-  %{__python} -%{py_shebang_flags} %{_rpmconfigdir}/redhat/import_all_modules.py\\\
   %{lua:
+  local command = "%{__python} "
+  if rpm.expand("%{?py_shebang_flags}") ~= "" then
+    command = command .. "-%{py_shebang_flags}"
+  end
+  command = command .. " %{_rpmconfigdir}/redhat/import_all_modules.py "
   -- handle multiline arguments correctly, see https://bugzilla.redhat.com/2018809
-  local args=rpm.expand('%{?**}'):gsub("[%s\\\\]*%s+", " ");print(args)
-  }}
+  local args=rpm.expand('%{?**}'):gsub("[%s\\\\]*%s+", " ")
+  print(command .. args)
+  }
+}
 
 %python_provide() %{lua:
   local python = require "fedora.srpm.python"

macros.python3

@@ -68,6 +68,7 @@
 
 # With $PATH and $PYTHONPATH set to the %%buildroot,
 # try to import the Python 3 module(s) given as command-line args or read from file (-f).
+# Respect the custom values of %%py3_shebang_flags or set nothing if it's undefined.
 # Filter and check import on only top-level modules using -t flag.
 # Exclude unwanted modules by passing their globs to -e option.
 # Useful as a smoke test in %%check when running tests is not feasible.
@@ -77,11 +78,17 @@
   PATH="%{buildroot}%{_bindir}:$PATH"\\\
   PYTHONPATH="${PYTHONPATH:-%{buildroot}%{python3_sitearch}:%{buildroot}%{python3_sitelib}}"\\\
   PYTHONDONTWRITEBYTECODE=1\\\
-  %{__python3} -%{py3_shebang_flags} %{_rpmconfigdir}/redhat/import_all_modules.py\\\
   %{lua:
+  local command = "%{__python3} "
+  if rpm.expand("%{?py3_shebang_flags}") ~= "" then
+    command = command .. "-%{py3_shebang_flags}"
+  end
+  command = command .. " %{_rpmconfigdir}/redhat/import_all_modules.py "
   -- handle multiline arguments correctly, see https://bugzilla.redhat.com/2018809
-  local args=rpm.expand('%{?**}'):gsub("[%s\\\\]*%s+", " ");print(args)
-  }}
+  local args=rpm.expand('%{?**}'):gsub("[%s\\\\]*%s+", " ")
+  print(command .. args)
+  }
+}
 
 # This only supports Python 3.5+ and will never work with Python 2.
 # Hence, it has no Python version in the name.

python-rpm-macros.spec

@@ -148,6 +148,8 @@ install -m 755 brp-* %{buildroot}%{_rpmconfigdir}/redhat/
 * Mon Nov 01 2021 Karolina Surma <ksurma@redhat.com> - 3.10-13
 - Fix multiline arguments processing for %%py_check_import
 Resolves: rhbz#2018809
+- Fix %%py_shebang_flags handling within %%py_check_import
+Resolves: rhbz#2018615
 
 * Mon Oct 25 2021 Karolina Surma <ksurma@redhat.com> - 3.10-12
 - Introduce -f (read from file) option to %%py{3}_check_import

tests/test_evals.py

@@ -691,6 +691,7 @@ def test_py3_check_import(args, expected_args, __python3, lib):
     macros = {
         'buildroot': 'BUILDROOT',
         '_rpmconfigdir': 'RPMCONFIGDIR',
+        'py3_shebang_flags': 's',
     }
     if __python3 is not None:
         if 'X.Y' in __python3:
@@ -714,7 +715,27 @@ def test_py3_check_import(args, expected_args, __python3, lib):
         PATH="BUILDROOT/usr/bin:$PATH"
         PYTHONPATH="${{PYTHONPATH:-BUILDROOT/usr/{lib}/python{x_y}/site-packages:BUILDROOT/usr/lib/python{x_y}/site-packages}}"
         PYTHONDONTWRITEBYTECODE=1
-        {__python3 or '/usr/bin/python3'} -s RPMCONFIGDIR/redhat/import_all_modules.py
-        {expected_args}
+        {__python3 or '/usr/bin/python3'} -s RPMCONFIGDIR/redhat/import_all_modules.py {expected_args}
         """)
     assert lines == expected.splitlines()
+
+
+@pytest.mark.parametrize(
+    'shebang_flags_value, expected_shebang_flags',
+    [
+        ('s', '-s'),
+        ('%{nil}', ''),
+        (None, ''),
+        ('Es', '-Es'),
+    ]
+)
+def test_py3_check_import_respects_shebang_flags(shebang_flags_value, expected_shebang_flags, lib):
+    macros = {
+        '_rpmconfigdir': 'RPMCONFIGDIR',
+        '__python3': '/usr/bin/python3',
+        'py3_shebang_flags': shebang_flags_value,
+    }
+    lines = rpm_eval('%py3_check_import sys', **macros)
+    # Compare the last line of the command, that's where lua part is evaluated
+    expected = f'/usr/bin/python3 {expected_shebang_flags} RPMCONFIGDIR/redhat/import_all_modules.py sys'
+    assert  lines[-1].strip() == expected