8 files changed, 64 insertions, 52 deletions
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index ad4d02c2c..f1569bf22 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -8,11 +8,6 @@
 
 namespace nix {
 
-std::string FileSystemHash::printMethodAlgo() const {
-    return makeFileIngestionPrefix(method) + printHashType(hash.type);
-}
-
-
 BasicDerivation::BasicDerivation(const BasicDerivation & other)
     : platform(other.platform)
     , builder(other.builder)
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 5fc3b37da..e314beac1 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -3,6 +3,7 @@
 #include "path.hh"
 #include "types.hh"
 #include "hash.hh"
+#include "file-hash.hh"
 
 #include <map>
 
@@ -12,20 +13,6 @@ namespace nix {
 
 /* Abstract syntax of derivations. */
 
-/// Pair of a hash, and how the file system was ingested
-struct FileSystemHash {
-    FileIngestionMethod method;
-    Hash hash;
-    FileSystemHash(FileIngestionMethod method, Hash hash)
-        : method(std::move(method))
-        , hash(std::move(hash))
-    { }
-    FileSystemHash(const FileSystemHash &) = default;
-    FileSystemHash(FileSystemHash &&) = default;
-    FileSystemHash & operator = (const FileSystemHash &) = default;
-    std::string printMethodAlgo() const;
-};
-
 struct DerivationOutput
 {
     StorePath path;
diff --git a/src/libstore/file-hash.cc b/src/libstore/file-hash.cc
new file mode 100644
index 000000000..549540db2
--- /dev/null
+++ b/src/libstore/file-hash.cc
@@ -0,0 +1,27 @@
+#include "file-hash.hh"
+
+namespace nix {
+
+std::string FileSystemHash::printMethodAlgo() const {
+    return makeFileIngestionPrefix(method) + printHashType(hash.type);
+}
+
+std::string makeFileIngestionPrefix(const FileIngestionMethod m) {
+    switch (m) {
+    case FileIngestionMethod::Flat:
+        return "";
+    case FileIngestionMethod::Recursive:
+        return "r:";
+    default:
+        throw Error("impossible, caught both cases");
+    }
+}
+
+std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash)
+{
+    return "fixed:"
+        + makeFileIngestionPrefix(method)
+        + hash.to_string();
+}
+
+}
diff --git a/src/libstore/file-hash.hh b/src/libstore/file-hash.hh
new file mode 100644
index 000000000..94122db07
--- /dev/null
+++ b/src/libstore/file-hash.hh
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "hash.hh"
+
+namespace nix {
+
+enum struct FileIngestionMethod : uint8_t {
+    Flat = false,
+    Recursive = true
+};
+
+/// Pair of a hash, and how the file system was ingested
+struct FileSystemHash {
+    FileIngestionMethod method;
+    Hash hash;
+    FileSystemHash(FileIngestionMethod method, Hash hash)
+        : method(std::move(method))
+        , hash(std::move(hash))
+    { }
+    FileSystemHash(const FileSystemHash &) = default;
+    FileSystemHash(FileSystemHash &&) = default;
+    FileSystemHash & operator = (const FileSystemHash &) = default;
+    std::string printMethodAlgo() const;
+};
+
+/* Compute the prefix to the hash algorithm which indicates how the files were
+   ingested. */
+std::string makeFileIngestionPrefix(const FileIngestionMethod m);
+
+/* Compute the content-addressability assertion (ValidPathInfo::ca)
+   for paths created by makeFixedOutputPath() / addToStore(). */
+std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash);
+
+}
diff --git a/src/libstore/path.hh b/src/libstore/path.hh
index f3ed6ca39..186976855 100644
--- a/src/libstore/path.hh
+++ b/src/libstore/path.hh
@@ -87,11 +87,6 @@ const size_t storePathHashLen = 32; // i.e. 160 bits
 /* Extension of derivations in the Nix store. */
 const std::string drvExtension = ".drv";
 
-enum struct FileIngestionMethod : uint8_t {
-    Flat = false,
-    Recursive = true
-};
-
 struct StorePathWithOutputs
 {
     StorePath path;
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index b7ba9e4f2..3c72dc56f 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -814,25 +814,6 @@ Strings ValidPathInfo::shortRefs() const
 }
 
 
-std::string makeFileIngestionPrefix(const FileIngestionMethod m) {
-    switch (m) {
-    case FileIngestionMethod::Flat:
-        return "";
-    case FileIngestionMethod::Recursive:
-        return "r:";
-    default:
-        throw Error("impossible, caught both cases");
-    }
-}
-
-std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash)
-{
-    return "fixed:"
-        + makeFileIngestionPrefix(method)
-        + hash.to_string();
-}
-
-
 void Store::addToStore(const ValidPathInfo & info, Source & narSource,
     RepairFlag repair, CheckSigsFlag checkSigs,
     std::shared_ptr<FSAccessor> accessor)
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 598798570..d89e10c94 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -2,6 +2,7 @@
 
 #include "path.hh"
 #include "hash.hh"
+#include "file-hash.hh"
 #include "serialise.hh"
 #include "crypto.hh"
 #include "lru-cache.hh"
@@ -846,15 +847,6 @@ std::optional<ValidPathInfo> decodeValidPathInfo(
     std::istream & str,
     bool hashGiven = false);
 
-/* Compute the prefix to the hash algorithm which indicates how the files were
-   ingested. */
-std::string makeFileIngestionPrefix(const FileIngestionMethod m);
-
-/* Compute the content-addressability assertion (ValidPathInfo::ca)
-   for paths created by makeFixedOutputPath() / addToStore(). */
-std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash);
-
-
 /* Split URI into protocol+hierarchy part and its parameter set. */
 std::pair<std::string, Store::Params> splitUriAndParams(const std::string & uri);
 
diff --git a/src/nix/hash.cc b/src/nix/hash.cc
index 3362ffd0d..ec23b77bc 100644
--- a/src/nix/hash.cc
+++ b/src/nix/hash.cc
@@ -1,5 +1,6 @@
 #include "command.hh"
 #include "hash.hh"
+#include "file-hash.hh"
 #include "legacy.hh"
 #include "shared.hh"
 #include "references.hh"