%pyproject_buildrequires: Accept installed pre-releases for all requirements

Related: rhbz#1950291

pyproject-rpm-macros.spec

@@ -12,7 +12,7 @@ License:        MIT
 # In other cases, such as backports, increment the point
 # release.
 Version:        0
-Release:        47%{?dist}
+Release:        48%{?dist}
 
 # Macro files
 Source001:      macros.pyproject
@@ -119,6 +119,9 @@ export HOSTNAME="rpmbuild"  # to speedup tox in network-less mock, see rhbz#1856
 %license LICENSE
 
 %changelog
+* Sat Oct 16 2021 Miro Hrončok <mhroncok@redhat.com> - 0-48
+- %%pyproject_buildrequires: Accept installed pre-releases for all requirements
+
 * Thu Sep 09 2021 Miro Hrončok <mhroncok@redhat.com> - 0-47
 - %%pyproject_save_files: Expand the namespace error message, also display it with /
 - %%pyproject_save_files: Add a workaround error for spaces and [brackets]

pyproject_buildrequires.py

@@ -127,6 +127,11 @@ class Requirements:
             print_err(f'Ignoring alien requirement:', requirement_str)
             return
 
+        # We need to always accept pre-releases as satisfying the requirement
+        # Otherwise e.g. installed cffi version 1.15.0rc2 won't even satisfy the requirement for "cffi"
+        # https://bugzilla.redhat.com/show_bug.cgi?id=2014639#c3
+        requirement.specifier.prereleases = True
+
         try:
             # TODO: check if requirements with extras are satisfied
             installed = self.get_installed_version(requirement.name)

pyproject_buildrequires_testcases.yaml

@@ -716,3 +716,26 @@ Weird and complex requirements file:
   # but that's good enough:
   - "WARNING: Simplifying 'ugly@git+https://github.com/monty/spam.git@master#egg=ugly' to 'ugly'."
   result: 0
+
+
+Pre-releases are accepted:
+  installed:
+    setuptools: 50
+    wheel: 1
+    toml: 1
+    cffi: 1.15.0rc2
+  pyproject.toml: |
+    [build-system]
+    requires = [
+        "setuptools",
+        "wheel",
+        "cffi",
+    ]
+    build-backend = "setuptools.build_meta"
+  expected: |
+    python3dist(setuptools)
+    python3dist(wheel)
+    python3dist(cffi)
+    python3dist(wheel)
+  stderr_contains: "Requirement satisfied: cffi"
+  result: 0