Apply clang-format universally.

* It is tough to contribute to a project that doesn't use a formatter,
* It is extra hard to contribute to a project which has configured the formatter, but ignores it for some files
* Code formatting makes it harder to hide obscure / weird bugs by accident or on purpose,

Let's rip the bandaid off?

Note that PRs currently in flight should be able to be merged relatively easily by applying `clang-format` to their tip prior to merge.

src/libstore-tests/downstream-placeholder.cc

@@ -4,7 +4,8 @@
 
 namespace nix {
 
-TEST(DownstreamPlaceholder, unknownCaOutput) {
+TEST(DownstreamPlaceholder, unknownCaOutput)
+{
     /**
      * We set these in tests rather than the regular globals so we don't have
      * to worry about race conditions if the tests run concurrently.
@@ -14,13 +15,13 @@ TEST(DownstreamPlaceholder, unknownCaOutput) {
 
     ASSERT_EQ(
         DownstreamPlaceholder::unknownCaOutput(
-            StorePath { "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-foo.drv" },
-            "out",
-            mockXpSettings).render(),
+            StorePath{"g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-foo.drv"}, "out", mockXpSettings)
+            .render(),
         "/0c6rn30q4frawknapgwq386zq358m8r6msvywcvc89n6m5p2dgbz");
 }
 
-TEST(DownstreamPlaceholder, unknownDerivation) {
+TEST(DownstreamPlaceholder, unknownDerivation)
+{
     /**
      * Same reason as above
      */
@@ -30,12 +31,11 @@ TEST(DownstreamPlaceholder, unknownDerivation) {
     ASSERT_EQ(
         DownstreamPlaceholder::unknownDerivation(
             DownstreamPlaceholder::unknownCaOutput(
-                StorePath { "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-foo.drv.drv" },
-                "out",
-                mockXpSettings),
+                StorePath{"g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-foo.drv.drv"}, "out", mockXpSettings),
             "out",
-            mockXpSettings).render(),
+            mockXpSettings)
+            .render(),
         "/0gn6agqxjyyalf0dpihgyf49xq5hqxgw100f0wydnj6yqrhqsb3w");
 }
 
-}
+} // namespace nix