Support for verifying MD5-based flat_hash caches

3 files changed, 370 insertions, 25 deletions

diff --git a/paludis/repositories/e/ebuild_flat_metadata_cache.cc b/paludis/repositories/e/ebuild_flat_metadata_cache.cc
index 19204ad4c..5096454ca 100644
--- a/paludis/repositories/e/ebuild_flat_metadata_cache.cc
+++ b/paludis/repositories/e/ebuild_flat_metadata_cache.cc
@@ -35,6 +35,7 @@
 #include <paludis/util/fs_stat.hh>
 #include <paludis/util/fs_error.hh>
 #include <paludis/util/pimp-impl.hh>
+#include <paludis/util/md5.hh>
 
 #include <paludis/environment.hh>
 #include <paludis/unformatted_pretty_printer.hh>
@@ -376,14 +377,36 @@ EbuildFlatMetadataCache::load(const std::shared_ptr<const EbuildID> & id, const
             std::vector<std::string> inherited;
 
             {
-                std::map<std::string, std::string>::const_iterator mtime_it(keys.find("_mtime_"));
-                std::time_t cache_time(keys.end() == mtime_it ? _imp->filename_stat.mtim().seconds() : destringify<std::time_t>(mtime_it->second));
-                bool ok(_imp->ebuild_stat.mtim().seconds() == cache_time);
-                if (! ok)
-                    Log::get_instance()->message("e.cache.flat_hash.mtime", ll_debug, lc_context)
-                        << "ebuild has mtime " << _imp->ebuild_stat.mtim().seconds() << ", but expected " << cache_time;
+                bool ok(true), is_md5(false);
+
+                std::map<std::string, std::string>::const_iterator md5_it(keys.find("_md5_"));
+                if (keys.end() != md5_it)
+                {
+                    is_md5 = true;
+                    SafeIFStream s(_imp->ebuild);
+                    MD5 md5(s);
+                    if (md5.hexsum() != md5_it->second)
+                    {
+                        Log::get_instance()->message("e.cache.flat_hash.md5", ll_debug, lc_context)
+                            << "ebuild has MD5 '" << md5.hexsum() << "', but expected '" << md5_it->second << "'";
+                        ok = false;
+                    }
+                }
 
-                if (ok) {
+                else
+                {
+                    std::map<std::string, std::string>::const_iterator mtime_it(keys.find("_mtime_"));
+                    std::time_t cache_time(keys.end() == mtime_it ? _imp->filename_stat.mtim().seconds() : destringify<std::time_t>(mtime_it->second));
+                    if (_imp->ebuild_stat.mtim().seconds() != cache_time)
+                    {
+                        Log::get_instance()->message("e.cache.flat_hash.mtime", ll_debug, lc_context)
+                            << "ebuild has mtime " << _imp->ebuild_stat.mtim().seconds() << ", but expected " << cache_time;
+                        ok = false;
+                    }
+                }
+
+                if (ok)
+                {
                     std::string cache_guessed(keys["_guessed_eapi_"]);
                     if (cache_guessed.empty())
                         cache_guessed = "0";
@@ -412,14 +435,6 @@ EbuildFlatMetadataCache::load(const std::shared_ptr<const EbuildID> & id, const
                                 << "_eclasses_ entry is incomplete";
                             return false;
                         }
-                        FSPath eclass_dir(std::string::npos != it->find('/') ? FSPath(*it++) : eclassdir);
-                        if (eclasses.end() == it)
-                        {
-                            Log::get_instance()->message("e.cache.flat_hash.eclass.truncated", ll_warning, lc_context)
-                                << "_eclasses_ entry is incomplete";
-                            return false;
-                        }
-                        std::time_t eclass_mtime(destringify<std::time_t>(*it));
 
                         auto eclass(_imp->eclass_mtimes->eclass(eclass_name));
                         if (eclass)
@@ -433,22 +448,47 @@ EbuildFlatMetadataCache::load(const std::shared_ptr<const EbuildID> & id, const
                             ok = false;
                         }
 
-                        else if (eclass->first.dirname() != eclass_dir)
+                        else if (is_md5)
                         {
-                            Log::get_instance()->message("e.cache.flat_hash.eclass.wrong_location", ll_debug, lc_context)
-                                << "Cache-requested eclass '" << eclass_name << "' was found at '"
-                                << eclass->first.dirname() << "', but expected '" << eclass_dir << "'";
-                            ok = false;
+                            std::string cache_md5(*it), actual_md5(_imp->eclass_mtimes->md5(eclass->first));
+                            if (actual_md5 != cache_md5)
+                            {
+                                Log::get_instance()->message("e.cache.flat_hash.eclass.wrong_md5", ll_debug, lc_context)
+                                    << "Cache-requested eclass '" << eclass_name << "' has MD5 '"
+                                    << actual_md5 << "', but expected '" << cache_md5 << "'";
+                                ok = false;
+                            }
                         }
 
-                        else if (eclass->second.mtim().seconds() != eclass_mtime)
+                        else
                         {
-                            Log::get_instance()->message("e.cache.flat_hash.eclass.wrong_mtime", ll_debug, lc_context)
-                                << "Cache-requested eclass '" << eclass_name << "' has mtime "
-                                << eclass->second.mtim().seconds() << ", but expected " << eclass_mtime;
-                            ok = false;
+                            FSPath eclass_dir(std::string::npos != it->find('/') ? FSPath(*it++) : eclassdir);
+                            if (eclasses.end() == it)
+                            {
+                                Log::get_instance()->message("e.cache.flat_hash.eclass.truncated", ll_warning, lc_context)
+                                    << "_eclasses_ entry is incomplete";
+                                return false;
+                            }
+                            std::time_t eclass_mtime(destringify<std::time_t>(*it));
+
+                            if (eclass->first.dirname() != eclass_dir)
+                            {
+                                Log::get_instance()->message("e.cache.flat_hash.eclass.wrong_location", ll_debug, lc_context)
+                                    << "Cache-requested eclass '" << eclass_name << "' was found at '"
+                                    << eclass->first.dirname() << "', but expected '" << eclass_dir << "'";
+                                ok = false;
+                            }
+
+                            else if (eclass->second.mtim().seconds() != eclass_mtime)
+                            {
+                                Log::get_instance()->message("e.cache.flat_hash.eclass.wrong_mtime", ll_debug, lc_context)
+                                    << "Cache-requested eclass '" << eclass_name << "' has mtime "
+                                    << eclass->second.mtim().seconds() << ", but expected " << eclass_mtime;
+                                ok = false;
+                            }
                         }
 
+
                         if (! ok)
                             break;
                     }
@@ -461,6 +501,13 @@ EbuildFlatMetadataCache::load(const std::shared_ptr<const EbuildID> & id, const
                     for (std::vector<std::string>::const_iterator it(exlibs.begin()),
                              it_end(exlibs.end()); it_end != it; ++it)
                     {
+                        if (is_md5)
+                        {
+                            Log::get_instance()->message("e.cache.flat_hash.exlib.md5.unimplemented", ll_warning, lc_context)
+                                << "Verifying _exlibs_ using MD5 is not yet implemented";
+                            return false;
+                        }
+
                         std::string exlib_name(*it);
                         inherited.push_back(exlib_name);
                         if (exlibs.end() == ++it)
diff --git a/paludis/repositories/e/ebuild_flat_metadata_cache_TEST.cc b/paludis/repositories/e/ebuild_flat_metadata_cache_TEST.cc
index 13a2a2bd5..c825469a9 100644
--- a/paludis/repositories/e/ebuild_flat_metadata_cache_TEST.cc
+++ b/paludis/repositories/e/ebuild_flat_metadata_cache_TEST.cc
@@ -446,6 +446,50 @@ TEST(EbuildFlatMetadataCache, HashBadMtime)
     EXPECT_EQ("The Generated Description flat_hash-bad-mtime", id1->short_description_key()->parse_value());
 }
 
+TEST(EbuildFlatMetadataCache, HashMD5)
+{
+    TestEnvironment env;
+    std::shared_ptr<Map<std::string, std::string> > keys(std::make_shared<Map<std::string, std::string>>());
+    keys->insert("format", "e");
+    keys->insert("names_cache", "/var/empty");
+    keys->insert("location", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo"));
+    keys->insert("profiles", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo/profiles/profile"));
+    keys->insert("eclassdirs", "ebuild_flat_metadata_cache_TEST_dir/repo/eclass ebuild_flat_metadata_cache_TEST_dir/extra_eclasses");
+    keys->insert("builddir", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir" / "build"));
+    std::shared_ptr<Repository> repo(ERepository::repository_factory_create(&env,
+                std::bind(from_keys, keys, std::placeholders::_1)));
+    env.add_repository(1, repo);
+
+    const std::shared_ptr<const PackageID> id1(*env[selection::RequireExactlyOne(generator::Matches(
+                    PackageDepSpec(parse_user_package_dep_spec("=cat/flat_hash-md5-1",
+                            &env, { })), make_null_shared_ptr(), { }))]->begin());
+
+    ASSERT_TRUE(bool(id1->short_description_key()));
+    EXPECT_EQ("The Description flat_hash-md5", id1->short_description_key()->parse_value());
+}
+
+TEST(EbuildFlatMetadataCache, HashBadMD5)
+{
+    TestEnvironment env;
+    std::shared_ptr<Map<std::string, std::string> > keys(std::make_shared<Map<std::string, std::string>>());
+    keys->insert("format", "e");
+    keys->insert("names_cache", "/var/empty");
+    keys->insert("location", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo"));
+    keys->insert("profiles", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo/profiles/profile"));
+    keys->insert("eclassdirs", "ebuild_flat_metadata_cache_TEST_dir/repo/eclass ebuild_flat_metadata_cache_TEST_dir/extra_eclasses");
+    keys->insert("builddir", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir" / "build"));
+    std::shared_ptr<Repository> repo(ERepository::repository_factory_create(&env,
+                std::bind(from_keys, keys, std::placeholders::_1)));
+    env.add_repository(1, repo);
+
+    const std::shared_ptr<const PackageID> id1(*env[selection::RequireExactlyOne(generator::Matches(
+                    PackageDepSpec(parse_user_package_dep_spec("=cat/flat_hash-bad-md5-1",
+                            &env, { })), make_null_shared_ptr(), { }))]->begin());
+
+    ASSERT_TRUE(bool(id1->short_description_key()));
+    EXPECT_EQ("The Generated Description flat_hash-bad-md5", id1->short_description_key()->parse_value());
+}
+
 TEST(EbuildFlatMetadataCache, HashNoEAPI)
 {
     TestEnvironment env;
@@ -766,6 +810,94 @@ TEST(EbuildFlatMetadataCache, HashEclassSpaces)
     EXPECT_EQ("The Generated Description flat_hash-eclasses-spaces", id->short_description_key()->parse_value());
 }
 
+TEST(EbuildFlatMetadataCache, HashEclassMD5)
+{
+    TestEnvironment env;
+    std::shared_ptr<Map<std::string, std::string> > keys(std::make_shared<Map<std::string, std::string>>());
+    keys->insert("format", "e");
+    keys->insert("names_cache", "/var/empty");
+    keys->insert("location", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo"));
+    keys->insert("profiles", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo/profiles/profile"));
+    keys->insert("eclassdirs", "ebuild_flat_metadata_cache_TEST_dir/repo/eclass ebuild_flat_metadata_cache_TEST_dir/extra_eclasses");
+    keys->insert("builddir", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir" / "build"));
+    std::shared_ptr<Repository> repo(ERepository::repository_factory_create(&env,
+                std::bind(from_keys, keys, std::placeholders::_1)));
+    env.add_repository(1, repo);
+
+    std::shared_ptr<const PackageID> id(*env[selection::RequireExactlyOne(generator::Matches(
+                    PackageDepSpec(parse_user_package_dep_spec("=cat/flat_hash-eclass-md5-1",
+                            &env, { })), make_null_shared_ptr(), { }))]->begin());
+
+    ASSERT_TRUE(bool(id->short_description_key()));
+    EXPECT_EQ("The Description flat_hash-eclass-md5", id->short_description_key()->parse_value());
+}
+
+TEST(EbuildFlatMetadataCache, HashEclassBadMD5)
+{
+    TestEnvironment env;
+    std::shared_ptr<Map<std::string, std::string> > keys(std::make_shared<Map<std::string, std::string>>());
+    keys->insert("format", "e");
+    keys->insert("names_cache", "/var/empty");
+    keys->insert("location", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo"));
+    keys->insert("profiles", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo/profiles/profile"));
+    keys->insert("eclassdirs", "ebuild_flat_metadata_cache_TEST_dir/repo/eclass ebuild_flat_metadata_cache_TEST_dir/extra_eclasses");
+    keys->insert("builddir", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir" / "build"));
+    std::shared_ptr<Repository> repo(ERepository::repository_factory_create(&env,
+                std::bind(from_keys, keys, std::placeholders::_1)));
+    env.add_repository(1, repo);
+
+    std::shared_ptr<const PackageID> id(*env[selection::RequireExactlyOne(generator::Matches(
+                    PackageDepSpec(parse_user_package_dep_spec("=cat/flat_hash-eclass-bad-md5-1",
+                            &env, { })), make_null_shared_ptr(), { }))]->begin());
+
+    ASSERT_TRUE(bool(id->short_description_key()));
+    EXPECT_EQ("The Generated Description flat_hash-eclass-bad-md5", id->short_description_key()->parse_value());
+}
+
+TEST(EbuildFlatMetadataCache, HashEclassTruncatedMD5)
+{
+    TestEnvironment env;
+    std::shared_ptr<Map<std::string, std::string> > keys(std::make_shared<Map<std::string, std::string>>());
+    keys->insert("format", "e");
+    keys->insert("names_cache", "/var/empty");
+    keys->insert("location", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo"));
+    keys->insert("profiles", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo/profiles/profile"));
+    keys->insert("eclassdirs", "ebuild_flat_metadata_cache_TEST_dir/repo/eclass ebuild_flat_metadata_cache_TEST_dir/extra_eclasses");
+    keys->insert("builddir", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir" / "build"));
+    std::shared_ptr<Repository> repo(ERepository::repository_factory_create(&env,
+                std::bind(from_keys, keys, std::placeholders::_1)));
+    env.add_repository(1, repo);
+
+    std::shared_ptr<const PackageID> id(*env[selection::RequireExactlyOne(generator::Matches(
+                    PackageDepSpec(parse_user_package_dep_spec("=cat/flat_hash-eclass-truncated-md5-1",
+                            &env, { })), make_null_shared_ptr(), { }))]->begin());
+
+    ASSERT_TRUE(bool(id->short_description_key()));
+    EXPECT_EQ("The Generated Description flat_hash-eclass-truncated-md5", id->short_description_key()->parse_value());
+}
+
+TEST(EbuildFlatMetadataCache, HashEclassGoneMD5)
+{
+    TestEnvironment env;
+    std::shared_ptr<Map<std::string, std::string> > keys(std::make_shared<Map<std::string, std::string>>());
+    keys->insert("format", "e");
+    keys->insert("names_cache", "/var/empty");
+    keys->insert("location", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo"));
+    keys->insert("profiles", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir/repo/profiles/profile"));
+    keys->insert("eclassdirs", "ebuild_flat_metadata_cache_TEST_dir/repo/eclass ebuild_flat_metadata_cache_TEST_dir/extra_eclasses");
+    keys->insert("builddir", stringify(FSPath::cwd() / "ebuild_flat_metadata_cache_TEST_dir" / "build"));
+    std::shared_ptr<Repository> repo(ERepository::repository_factory_create(&env,
+                std::bind(from_keys, keys, std::placeholders::_1)));
+    env.add_repository(1, repo);
+
+    std::shared_ptr<const PackageID> id(*env[selection::RequireExactlyOne(generator::Matches(
+                    PackageDepSpec(parse_user_package_dep_spec("=cat/flat_hash-eclass-gone-md5-1",
+                            &env, { })), make_null_shared_ptr(), { }))]->begin());
+
+    ASSERT_TRUE(bool(id->short_description_key()));
+    EXPECT_EQ("The Generated Description flat_hash-eclass-gone-md5", id->short_description_key()->parse_value());
+}
+
 TEST(EbuildFlatMetadataCache, HashExlib)
 {
     TestEnvironment env;
diff --git a/paludis/repositories/e/ebuild_flat_metadata_cache_TEST_setup.sh b/paludis/repositories/e/ebuild_flat_metadata_cache_TEST_setup.sh
index e8a61f02e..ee90764f8 100755
--- a/paludis/repositories/e/ebuild_flat_metadata_cache_TEST_setup.sh
+++ b/paludis/repositories/e/ebuild_flat_metadata_cache_TEST_setup.sh
@@ -477,6 +477,57 @@ END
 TZ=UTC touch -t 197001010001 cat/flat_hash-bad-mtime/flat_hash-bad-mtime-1 || exit 2
 TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-bad-mtime-1 || exit 2
 
+mkdir cat/flat_hash-md5
+cat <<END > cat/flat_hash-md5/flat_hash-md5-1.ebuild || exit 1
+END
+cat <<END > metadata/cache/cat/flat_hash-md5-1 || exit 1
+_md5_=d41d8cd98f00b204e9800998ecf8427e
+_guessed_eapi_=0
+DEPEND=the/depend
+RDEPEND=the/rdepend
+SLOT=the-slot
+SRC_URI=the-src-uri
+RESTRICT=the-restrict
+HOMEPAGE=the-homepage
+LICENSE=the-license
+DESCRIPTION=The Description flat_hash-md5
+KEYWORDS=the-keywords
+IUSE=the-iuse
+PDEPEND=the/pdepend
+EAPI=0
+END
+TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-md5-1 || exit 2
+
+mkdir cat/flat_hash-bad-md5
+cat <<END > cat/flat_hash-bad-md5/flat_hash-bad-md5-1.ebuild || exit 1
+DESCRIPTION="The Generated Description flat_hash-bad-md5"
+HOMEPAGE="http://example.com/"
+SRC_URI=""
+SLOT="0"
+IUSE=""
+LICENSE="GPL-2"
+KEYWORDS="test"
+DEPEND=""
+END
+cat <<END > metadata/cache/cat/flat_hash-bad-md5-1 || exit 1
+_md5_=d41d8cd98f00b204e9800998ecf8427e
+_guessed_eapi_=0
+DEPEND=the/depend
+RDEPEND=the/rdepend
+SLOT=the-slot
+SRC_URI=the-src-uri
+RESTRICT=the-restrict
+HOMEPAGE=the-homepage
+LICENSE=the-license
+DESCRIPTION=The Stale Description
+KEYWORDS=the-keywords
+IUSE=the-iuse
+PDEPEND=the/pdepend
+EAPI=0
+END
+TZ=UTC touch -t 197001010001 cat/flat_hash-bad-md5/flat_hash-bad-md5-1.ebuild || exit 2
+TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-bad-md5-1 || exit 2
+
 mkdir cat/flat_hash-no-eapi
 cat <<END > cat/flat_hash-no-eapi/flat_hash-no-eapi-1.ebuild || exit 1
 DESCRIPTION="The Generated Description flat_hash-no-eapi"
@@ -913,6 +964,121 @@ PROPERTIES=the-properties
 END
 TZ=UTC touch -t 197001010001 cat/flat_hash-eclasses-spaces/flat_hash-eclasses-spaces-1.ebuild || exit 2
 
+mkdir cat/flat_hash-eclass-md5
+cat <<END > cat/flat_hash-eclass-md5/flat_hash-eclass-md5-1.ebuild || exit 1
+END
+cat <<END > metadata/cache/cat/flat_hash-eclass-md5-1 || exit 1
+_md5_=d41d8cd98f00b204e9800998ecf8427e
+_guessed_eapi_=0
+_eclasses_=foo	0a4d9ad1a63a829bc31879a68024ef78	bar	d41d8cd98f00b204e9800998ecf8427e
+DEPEND=the/depend
+RDEPEND=the/rdepend
+SLOT=the-slot
+SRC_URI=the-src-uri
+RESTRICT=the-restrict
+HOMEPAGE=the-homepage
+LICENSE=the-license
+DESCRIPTION=The Description flat_hash-eclass-md5
+KEYWORDS=the-keywords
+IUSE=the-iuse
+PDEPEND=the/pdepend
+EAPI=0
+END
+TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-eclass-md5-1 || exit 2
+
+mkdir cat/flat_hash-eclass-bad-md5
+cat <<END > cat/flat_hash-eclass-bad-md5/flat_hash-eclass-bad-md5-1.ebuild || exit 1
+DESCRIPTION="The Generated Description flat_hash-eclass-bad-md5"
+HOMEPAGE="http://example.com/"
+SRC_URI=""
+SLOT="0"
+IUSE=""
+LICENSE="GPL-2"
+KEYWORDS="test"
+DEPEND=""
+END
+cat <<END > metadata/cache/cat/flat_hash-eclass-bad-md5-1 || exit 1
+_md5_=d3472291afcdc827fa4bff7215be1bfa
+_guessed_eapi_=0
+_eclasses_=foo	0a4d9ad1a63a829bc31879a68024ef79	bar	d41d8cd98f00b204e9800998ecf8427e
+DEPEND=the/depend
+RDEPEND=the/rdepend
+SLOT=the-slot
+SRC_URI=the-src-uri
+RESTRICT=the-restrict
+HOMEPAGE=the-homepage
+LICENSE=the-license
+DESCRIPTION=The Stale Description
+KEYWORDS=the-keywords
+IUSE=the-iuse
+PDEPEND=the/pdepend
+EAPI=0
+END
+TZ=UTC touch -t 197001010001 cat/flat_hash-eclass-bad-md5/flat_hash-eclass-bad-md5-1.ebuild || exit 2
+TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-eclass-bad-md5-1 || exit 2
+
+mkdir cat/flat_hash-eclass-truncated-md5
+cat <<END > cat/flat_hash-eclass-truncated-md5/flat_hash-eclass-truncated-md5-1.ebuild || exit 1
+DESCRIPTION="The Generated Description flat_hash-eclass-truncated-md5"
+HOMEPAGE="http://example.com/"
+SRC_URI=""
+SLOT="0"
+IUSE=""
+LICENSE="GPL-2"
+KEYWORDS="test"
+DEPEND=""
+END
+cat <<END > metadata/cache/cat/flat_hash-eclass-truncated-md5-1 || exit 1
+_md5_=088607e2812c483ecc9a16b69fd1b71f
+_guessed_eapi_=0
+_eclasses_=foo	0a4d9ad1a63a829bc31879a68024ef78	bar
+DEPEND=the/depend
+RDEPEND=the/rdepend
+SLOT=the-slot
+SRC_URI=the-src-uri
+RESTRICT=the-restrict
+HOMEPAGE=the-homepage
+LICENSE=the-license
+DESCRIPTION=The Stale Description
+KEYWORDS=the-keywords
+IUSE=the-iuse
+PDEPEND=the/pdepend
+EAPI=0
+END
+TZ=UTC touch -t 197001010001 cat/flat_hash-eclass-truncated-md5/flat_hash-eclass-truncated-md5-1.ebuild || exit 2
+TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-eclass-truncated-md5-1 || exit 2
+
+mkdir cat/flat_hash-eclass-gone-md5
+cat <<END > cat/flat_hash-eclass-gone-md5/flat_hash-eclass-gone-md5-1.ebuild || exit 1
+DESCRIPTION="The Generated Description flat_hash-eclass-gone-md5"
+HOMEPAGE="http://example.com/"
+SRC_URI=""
+SLOT="0"
+IUSE=""
+LICENSE="GPL-2"
+KEYWORDS="test"
+DEPEND=""
+END
+cat <<END > metadata/cache/cat/flat_hash-eclass-gone-md5-1 || exit 1
+_md5_=7a0546fdebe4320feb9008ea76ca3ace
+_guessed_eapi_=0
+_eclasses_=foo	0a4d9ad1a63a829bc31879a68024ef78	bat	d41d8cd98f00b204e9800998ecf8427e
+DEPEND=the/depend
+RDEPEND=the/rdepend
+SLOT=the-slot
+SRC_URI=the-src-uri
+RESTRICT=the-restrict
+HOMEPAGE=the-homepage
+LICENSE=the-license
+DESCRIPTION=The Stale Description
+KEYWORDS=the-keywords
+IUSE=the-iuse
+PDEPEND=the/pdepend
+EAPI=0
+END
+TZ=UTC touch -t 197001010001 cat/flat_hash-eclass-gone-md5/flat_hash-eclass-gone-md5-1.ebuild || exit 2
+TZ=UTC touch -t 197001010001 metadata/cache/cat/flat_hash-eclass-gone-md5-1 || exit 2
+
 mkdir cat/flat_hash-exlib
 cat <<END > cat/flat_hash-exlib/flat_hash-exlib-1.ebuild || exit 1
 END