libpriv/rpm-util: encode epoch as a string

This is essentially a revert of #1190. I initially changed from storing
the epoch, version, and release separately to together to avoid endian
issues with epoch. This works around that instead by just encoding it as
a string.

As is done in our custom NEVRA printer (which before #1190 we used
here), we make sure that epochs of "0" are not printed as part of the
`nevra` or `evr` members.

Closes: #1198
Approved by: cgwalters

src/lib/rpmostree-package.c

@@ -53,6 +53,7 @@ struct RpmOstreePackage
   char *nevra;
   const char *name;
   const char *evr;
+  char *evr_owned;
   const char *arch;
 };
 
@@ -67,6 +68,7 @@ rpm_ostree_package_finalize (GObject *object)
   g_clear_pointer (&pkg->gv_nevra, g_variant_unref);
 
   g_clear_pointer (&pkg->nevra, g_free);
+  g_clear_pointer (&pkg->evr_owned, g_free);
 
   G_OBJECT_CLASS (rpm_ostree_package_parent_class)->finalize (object);
 }
@@ -193,8 +195,18 @@ _rpm_ostree_package_new_from_variant (GVariant *gv_nevra)
   p->gv_nevra = g_variant_ref (gv_nevra);
 
   /* we deconstruct now to make accessors simpler */
+  const char *epoch;
+  const char *version;
+  const char *release;
 
-  g_variant_get (p->gv_nevra, "(&s&s&s)", &p->name, &p->evr, &p->arch);
+  g_variant_get (p->gv_nevra, "(&s&s&s&s&s)", &p->name, &epoch, &version, &release, &p->arch);
+  /* we follow the libdnf convention here of explicit 0 --> skip over */
+  g_assert (epoch);
+  if (g_str_equal (epoch, "0"))
+    p->evr_owned = g_strdup_printf ("%s-%s", version, release);
+  else
+    p->evr_owned = g_strdup_printf ("%s:%s-%s", epoch, version, release);
+  p->evr = p->evr_owned;
   p->nevra = g_strdup_printf ("%s-%s.%s", p->name, p->evr, p->arch);
   return p;
 }
@@ -205,7 +217,7 @@ get_commit_rpmdb_pkglist (GVariant *commit)
   g_autoptr(GVariant) meta = g_variant_get_child_value (commit, 0);
   g_autoptr(GVariantDict) meta_dict = g_variant_dict_new (meta);
   return g_variant_dict_lookup_value (meta_dict, "rpmostree.rpmdb.pkglist",
-                                      G_VARIANT_TYPE ("a(sss)"));
+                                      G_VARIANT_TYPE ("a(sssss)"));
 }
 
 static GPtrArray *

src/libpriv/rpmostree-rpm-util.c

@@ -1143,15 +1143,20 @@ rpmostree_create_rpmdb_pkglist_variant (int              rootfs_dfd,
   g_autoptr(GPtrArray) pkglist = rpmostree_sack_get_sorted_packages (refsack->sack);
 
   GVariantBuilder pkglist_v_builder;
-  g_variant_builder_init (&pkglist_v_builder, (GVariantType*)"a(sss)");
+  g_variant_builder_init (&pkglist_v_builder, (GVariantType*)"a(sssss)");
 
   const guint n = pkglist->len;
   for (guint i = 0; i < n; i++)
     {
       DnfPackage *pkg = pkglist->pdata[i];
-      g_variant_builder_add (&pkglist_v_builder, "(sss)",
-                             dnf_package_get_name (pkg),
-                             dnf_package_get_evr (pkg),
+
+      /* put epoch as a string so we're indifferent to endianness -- also note that unlike
+       * librpm, libdnf doesn't care about unset vs 0 epoch and neither do we */
+      g_autofree char *epoch = g_strdup_printf ("%" PRIu64, dnf_package_get_epoch (pkg));
+      g_variant_builder_add (&pkglist_v_builder, "(sssss)",
+                             dnf_package_get_name (pkg), epoch,
+                             dnf_package_get_version (pkg),
+                             dnf_package_get_release (pkg),
                              dnf_package_get_arch (pkg));
     }
 

tests/vmcheck/test-layering-basic.sh

@@ -75,8 +75,13 @@ rm -f refs.txt refdata.txt
 vm_cmd ostree fsck
 vm_cmd ostree show --print-metadata-key rpmostree.rpmdb.pkglist \
        $(vm_get_deployment_info 0 checksum) > variant-pkglist.txt
-# No 0: in EVR
-assert_file_has_content_literal 'variant-pkglist.txt' "('foo', '1.0-1', 'x86_64')"
+# 0 shows up in variant dump
+assert_file_has_content_literal 'variant-pkglist.txt' "('foo', '0', '1.0', '1', 'x86_64')"
+# But no 0: in e.g. db diff output, which uses pkglist metadata
+vm_rpmostree db diff --format=diff \
+  $(vm_get_deployment_info 0 base-checksum) \
+  $(vm_get_deployment_info 0 checksum) > db-diff.txt
+assert_file_has_content_literal 'db-diff.txt' "+foo-1.0-1.x86_64"
 echo "ok pkg-add foo"
 
 vm_reboot