ResolverPlayground: Use egencache to create manifests

Make the ResolverPlayground _create_ebuild_manifests method
call egencache --jobs, which reliably triggers the KeyError
from bug 924319 for multiple tests:

lib/portage/tests/bin/test_doins.py::DoIns::testDoInsFallback Exception in callback EbuildMetadataPhase._async_start_done(<Task finishe...Error('EAPI')>)
handle: <Handle EbuildMetadataPhase._async_start_done(<Task finishe...Error('EAPI')>)>
Traceback (most recent call last):
  File "/usr/lib/python3.12/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "lib/_emerge/EbuildMetadataPhase.py", line 154, in _async_start_done
    future.cancelled() or future.result()
                          ^^^^^^^^^^^^^^^
  File "lib/_emerge/EbuildMetadataPhase.py", line 130, in _async_start
    retval = portage.doebuild(
             ^^^^^^^^^^^^^^^^^
  File "lib/portage/package/ebuild/doebuild.py", line 1030, in doebuild
    doebuild_environment(
  File "lib/portage/package/ebuild/doebuild.py", line 519, in doebuild_environment
    eapi = mysettings.configdict["pkg"]["EAPI"]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
  File "lib/portage/util/__init__.py", line 1684, in __getitem__
    return UserDict.__getitem__(self, item_key)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "lib/portage/cache/mappings.py", line 175, in __getitem__
    return self.data[key]
           ~~~~~~~~~^^^^^
KeyError: 'EAPI'

Bug: https://bugs.gentoo.org/924319
Signed-off-by: Zac Medico <zmedico@gentoo.org>

2 files changed, 23 insertions, 19 deletions

diff --git a/lib/portage/tests/dbapi/test_portdb_cache.py b/lib/portage/tests/dbapi/test_portdb_cache.py
index c7c6913b4..c24a4f209 100644
--- a/lib/portage/tests/dbapi/test_portdb_cache.py
+++ b/lib/portage/tests/dbapi/test_portdb_cache.py
@@ -1,6 +1,7 @@
-# Copyright 2012-2023 Gentoo Authors
+# Copyright 2012-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
+import shutil
 import subprocess
 import sys
 import textwrap
@@ -63,6 +64,7 @@ class PortdbCacheTestCase(TestCase):
         python_cmd = (portage_python, "-b", "-Wd", "-c")
 
         test_commands = (
+            (lambda: shutil.rmtree(md5_cache_dir) or True,),
             (lambda: not os.path.exists(pms_cache_dir),),
             (lambda: not os.path.exists(md5_cache_dir),),
             python_cmd
diff --git a/lib/portage/tests/resolver/ResolverPlayground.py b/lib/portage/tests/resolver/ResolverPlayground.py
index 2d2601287..75c86b615 100644
--- a/lib/portage/tests/resolver/ResolverPlayground.py
+++ b/lib/portage/tests/resolver/ResolverPlayground.py
@@ -3,6 +3,7 @@
 
 import bz2
 import fnmatch
+import subprocess
 import tempfile
 import portage
 
@@ -18,8 +19,6 @@ from portage.const import (
 from portage.process import find_binary
 from portage.dep import Atom, _repo_separator
 from portage.dbapi.bintree import binarytree
-from portage.package.ebuild.config import config
-from portage.package.ebuild.digestgen import digestgen
 from portage._sets import load_default_config
 from portage._sets.base import InternalPackageSet
 from portage.tests import cnf_path
@@ -323,22 +322,25 @@ class ResolverPlayground:
                     f.write(misc_content)
 
     def _create_ebuild_manifests(self, ebuilds):
-        tmpsettings = config(clone=self.settings)
-        tmpsettings["PORTAGE_QUIET"] = "1"
-        for cpv in ebuilds:
-            a = Atom("=" + cpv, allow_repo=True)
-            repo = a.repo
-            if repo is None:
-                repo = "test_repo"
-
-            repo_dir = self._get_repo_dir(repo)
-            ebuild_dir = os.path.join(repo_dir, a.cp)
-            ebuild_path = os.path.join(ebuild_dir, a.cpv.split("/")[1] + ".ebuild")
-
-            portdb = self.trees[self.eroot]["porttree"].dbapi
-            tmpsettings["O"] = ebuild_dir
-            if not digestgen(mysettings=tmpsettings, myportdb=portdb):
-                raise AssertionError(f"digest creation failed for {ebuild_path}")
+        for repo_name in self._repositories:
+            if repo_name == "DEFAULT":
+                continue
+            egencache_cmd = [
+                "egencache",
+                f"--repo={repo_name}",
+                "--update",
+                "--update-manifests",
+                "--sign-manifests=n",
+                "--strict-manifests=n",
+                f"--repositories-configuration={self.settings['PORTAGE_REPOSITORIES']}",
+                f"--jobs={portage.util.cpuinfo.get_cpu_count()}",
+            ]
+            result = subprocess.run(
+                egencache_cmd,
+                env=self.settings.environ(),
+            )
+            if result.returncode != os.EX_OK:
+                raise AssertionError(f"command failed: {egencache_cmd}")
 
     def _create_binpkgs(self, binpkgs):
         # When using BUILD_ID, there can be multiple instances for the