From 28533465a19c45f066004b98b0006e1daf18b6b9 Mon Sep 17 00:00:00 2001
From: Miro Hrončok <miro@hroncok.cz>
Date: Apr 14 2020 16:18:48 +0000
Subject: Add the %pycached macro


Usage:

  %files
  ...
  %pycached %{python3_sitelib}/foo.py

This will list:

  /usr/lib/python3.8/site-packages/foo.py
  /usr/lib/python3.8/site-packages/__pycache__/foo.cpython-38{,.opt-?}.pyc

Assuming the Python 3 version is 3.8.
The bytecode files are globbed, their presence is not checked.

This will fail:

  %pycached %{python3_sitelib}/foo

error: %pycached can only be used with paths explicitly ending with .py

And so will any of this:

  %pycached %{python3_sitelib}/*
  %pycached %{python3_sitelib}/foo.*
  %pycached %{python3_sitelib}/foo.p?
  %pycached %{python3_sitelib}/foo.?y
  %pycached %{python3_sitelib}/foo.??

But this will work:

  %pycached %{python3_sitelib}/foo*.py

And it will generate the following globs:

  /usr/lib/python3.8/site-packages/foo*.py
  /usr/lib/python3.8/site-packages/__pycache__/foo*.cpython-38{,.opt-?}.pyc

When used with paths that include Python 3 version, it globs with the version:

  %pycached /opt/python3.10/foo.py

Generates:

  /opt/python3.10/foo.py
  /opt/python3.10/__pycache__/foo.cpython-310{,.opt-?}.pyc

While paths without version have less strict globs:

  %pycached /custom/foo.py
  /custom/foo.py
  /custom/__pycache__/foo.cpython-3*{,.opt-?}.pyc

This will generate a warning in RPM build:

warning: File listed twice: /custom/__pycache__/foo.cpython-38.opt-1.pyc

However it ensures the optimized bytecode is there.

---

diff --git a/epel-rpm-macros.spec b/epel-rpm-macros.spec
index 93bdfb4..fa0b3f3 100644
--- a/epel-rpm-macros.spec
+++ b/epel-rpm-macros.spec
@@ -1,6 +1,6 @@
 Name:           epel-rpm-macros
 Version:        7
-Release:        23
+Release:        24
 Summary:        Extra Packages for Enterprise Linux RPM macros
 
 Group:          System Environment/Base
@@ -52,6 +52,9 @@ install -Dpm 755 %{SOURCE2} \
 
 
 %changelog
+* Sat Dec 28 2019 Miro Hrončok <mhroncok@redhat.com> - 7-24
+- Add the %%pycached macro
+
 * Tue Oct 22 2019 Miro Hrončok <mhroncok@redhat.com> - 7-23
 - Override %%py_build from RHEL not to use %%__python2 but %%__python
 
diff --git a/macros.epel-rpm-macros b/macros.epel-rpm-macros
index d79a593..7cf8795 100644
--- a/macros.epel-rpm-macros
+++ b/macros.epel-rpm-macros
@@ -52,6 +52,25 @@
   FCFLAGS="${FCFLAGS:-%{build_fflags}}" ; export FCFLAGS ; \
   LDFLAGS="${LDFLAGS:-%{build_ldflags}}" ; export LDFLAGS
 
+# This only supports Python 3.5+ and will never work with Python 2.
+# Hence, it has no Python version in the name.
+%pycached() %{lua:
+  path = rpm.expand("%{?1}")
+  if (string.sub(path, "-3") ~= ".py") then
+    rpm.expand("%{error:%%pycached can only be used with paths explicitly ending with .py}")
+  else
+    print(path)
+    pyminor = path:match("/python3.(%d+)/") or "*"
+    if ((pyminor ~= "*") and (tonumber(pyminor) < 5)) then
+      rpm.expand("%{error:%%pycached does not support Python 3." .. pyminor .. "}")
+    else
+      dirname = path:match("(.*/)")
+      modulename = path:match(".*/([^/]+).py")
+      print("\\n" .. dirname .. "__pycache__/" .. modulename .. ".cpython-3" .. pyminor .. "{,.opt-?}.pyc")
+    end
+  end
+}
+
 # gpgverify verifies signed sources. There is documentation in the script.
 %gpgverify %{_rpmconfigdir}/gpgverify