Remove tarball-cache.{hh,cc}

TarballInfo is only used in github.cc, and getTarballCache() is a bit
too trivial to have its own file.

src/libfetchers/git-utils.cc

@@ -986,4 +986,11 @@ std::vector<std::tuple<GitRepoImpl::Submodule, Hash>> GitRepoImpl::getSubmodules
     return result;
 }
 
+ref<GitRepo> getTarballCache()
+{
+    static auto repoDir = std::filesystem::path(getCacheDir()) / "nix" / "tarball-cache";
+
+    return GitRepo::openRepo(repoDir, true, true);
+}
+
 }

src/libfetchers/git-utils.hh

@@ -95,4 +95,6 @@ struct GitRepo
         const std::vector<fetchers::PublicKey> & publicKeys) = 0;
 };
 
+ref<GitRepo> getTarballCache();
+
 }

src/libfetchers/github.cc

@@ -10,7 +10,6 @@
 #include "tarball.hh"
 #include "tarfile.hh"
 #include "git-utils.hh"
-#include "tarball-cache.hh"
 
 #include <optional>
 #include <nlohmann/json.hpp>
@@ -193,6 +192,12 @@ struct GitArchiveInputScheme : InputScheme
 
     virtual DownloadUrl getDownloadUrl(const Input & input) const = 0;
 
+    struct TarballInfo
+    {
+        Hash treeHash;
+        time_t lastModified;
+    };
+
     std::pair<Input, TarballInfo> downloadArchive(ref<Store> store, Input input) const
     {
         if (!maybeGetStrAttr(input.attrs, "ref")) input.attrs.insert_or_assign("ref", "HEAD");

src/libfetchers/tarball-cache.cc

@@ -1,13 +0,0 @@
-#include "tarball-cache.hh"
-#include "users.hh"
-
-namespace nix::fetchers {
-
-ref<GitRepo> getTarballCache()
-{
-    static auto repoDir = std::filesystem::path(getCacheDir()) / "nix" / "tarball-cache";
-
-    return GitRepo::openRepo(repoDir, true, true);
-}
-
-}

src/libfetchers/tarball-cache.hh

@@ -1,17 +0,0 @@
-#pragma once
-///@file
-
-#include "ref.hh"
-#include "git-utils.hh"
-
-namespace nix::fetchers {
-
-struct TarballInfo
-{
-    Hash treeHash;
-    time_t lastModified;
-};
-
-ref<GitRepo> getTarballCache();
-
-}