7 files changed, 25 insertions, 14 deletions

diff --git a/src/nix/add-to-store.cc b/src/nix/add-to-store.cc
index f43f774c1..f9d6de16e 100644
--- a/src/nix/add-to-store.cc
+++ b/src/nix/add-to-store.cc
@@ -48,7 +48,10 @@ struct CmdAddToStore : MixDryRun, StoreCommand
         ValidPathInfo info(store->makeFixedOutputPath(FileIngestionMethod::Recursive, narHash, *namePart));
         info.narHash = narHash;
         info.narSize = sink.s->size();
-        info.ca = makeFixedOutputCA(FileIngestionMethod::Recursive, info.narHash);
+        info.ca = std::optional { FixedOutputHash {
+            .method = FileIngestionMethod::Recursive,
+            .hash = info.narHash,
+        } };
 
         if (!dryRun) {
             auto source = StringSource { *sink.s };
diff --git a/src/nix/develop.cc b/src/nix/develop.cc
index 05a9b9cd9..037987313 100644
--- a/src/nix/develop.cc
+++ b/src/nix/develop.cc
@@ -135,7 +135,13 @@ StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
     drv.inputSrcs.insert(std::move(getEnvShPath));
     Hash h = hashDerivationModulo(*store, drv, true);
     auto shellOutPath = store->makeOutputPath("out", h, drvName);
-    drv.outputs.insert_or_assign("out", DerivationOutput { shellOutPath, "", "" });
+    drv.outputs.insert_or_assign("out", DerivationOutput {
+        .path = shellOutPath,
+        .hash = FixedOutputHash {
+            .method = FileIngestionMethod::Flat,
+            .hash = Hash { },
+        },
+    });
     drv.env["out"] = store->printStorePath(shellOutPath);
     auto shellDrvPath2 = writeDerivation(store, drv, drvName);
 
diff --git a/src/nix/hash.cc b/src/nix/hash.cc
index 0dd4998d9..b97c6d21f 100644
--- a/src/nix/hash.cc
+++ b/src/nix/hash.cc
@@ -1,5 +1,6 @@
 #include "command.hh"
 #include "hash.hh"
+#include "content-address.hh"
 #include "legacy.hh"
 #include "shared.hh"
 #include "references.hh"
@@ -79,12 +80,12 @@ static RegisterCommand r2("hash-path", [](){ return make_ref<CmdHash>(FileIngest
 struct CmdToBase : Command
 {
     Base base;
-    HashType ht = htUnknown;
+    std::optional<HashType> ht;
     std::vector<std::string> args;
 
     CmdToBase(Base base) : base(base)
     {
-        addFlag(Flag::mkHashTypeFlag("type", &ht));
+        addFlag(Flag::mkHashTypeOptFlag("type", &ht));
         expectArgs("strings", &args);
     }
 
@@ -132,8 +133,6 @@ static int compatNixHash(int argc, char * * argv)
         else if (*arg == "--type") {
             string s = getArg(*arg, arg, end);
             ht = parseHashType(s);
-            if (ht == htUnknown)
-                throw UsageError("unknown hash type '%1%'", s);
         }
         else if (*arg == "--to-base16") op = opTo16;
         else if (*arg == "--to-base32") op = opTo32;
diff --git a/src/nix/make-content-addressable.cc b/src/nix/make-content-addressable.cc
index 0ebb8f13b..fb36fc410 100644
--- a/src/nix/make-content-addressable.cc
+++ b/src/nix/make-content-addressable.cc
@@ -82,7 +82,10 @@ struct CmdMakeContentAddressable : StorePathsCommand, MixJSON
             if (hasSelfReference) info.references.insert(info.path);
             info.narHash = narHash;
             info.narSize = sink.s->size();
-            info.ca = makeFixedOutputCA(FileIngestionMethod::Recursive, info.narHash);
+            info.ca = FixedOutputHash {
+                .method = FileIngestionMethod::Recursive,
+                .hash = info.narHash,
+            };
 
             if (!json)
                 printInfo("rewrote '%s' to '%s'", pathS, store->printStorePath(info.path));
diff --git a/src/nix/path-info.cc b/src/nix/path-info.cc
index fb7bacc4c..b89a44f83 100644
--- a/src/nix/path-info.cc
+++ b/src/nix/path-info.cc
@@ -115,7 +115,7 @@ struct CmdPathInfo : StorePathsCommand, MixJSON
                     std::cout << '\t';
                     Strings ss;
                     if (info->ultimate) ss.push_back("ultimate");
-                    if (info->ca != "") ss.push_back("ca:" + info->ca);
+                    if (info->ca) ss.push_back("ca:" + renderContentAddress(*info->ca));
                     for (auto & sig : info->sigs) ss.push_back(sig);
                     std::cout << concatStringsSep(" ", ss);
                 }
diff --git a/src/nix/show-derivation.cc b/src/nix/show-derivation.cc
index 2d31894c2..5d77cfdca 100644
--- a/src/nix/show-derivation.cc
+++ b/src/nix/show-derivation.cc
@@ -70,9 +70,9 @@ struct CmdShowDerivation : InstallablesCommand
                 for (auto & output : drv.outputs) {
                     auto outputObj(outputsObj.object(output.first));
                     outputObj.attr("path", store->printStorePath(output.second.path));
-                    if (output.second.hash != "") {
-                        outputObj.attr("hashAlgo", output.second.hashAlgo);
-                        outputObj.attr("hash", output.second.hash);
+                    if (output.second.hash) {
+                        outputObj.attr("hashAlgo", output.second.hash->printMethodAlgo());
+                        outputObj.attr("hash", output.second.hash->hash.to_string(Base16, false));
                     }
                 }
             }
diff --git a/src/nix/verify.cc b/src/nix/verify.cc
index ab83637dc..bb5e4529b 100644
--- a/src/nix/verify.cc
+++ b/src/nix/verify.cc
@@ -87,10 +87,10 @@ struct CmdVerify : StorePathsCommand
                 if (!noContents) {
 
                     std::unique_ptr<AbstractHashSink> hashSink;
-                    if (info->ca == "")
-                        hashSink = std::make_unique<HashSink>(info->narHash.type);
+                    if (!info->ca)
+                        hashSink = std::make_unique<HashSink>(*info->narHash.type);
                     else
-                        hashSink = std::make_unique<HashModuloSink>(info->narHash.type, std::string(info->path.hashPart()));
+                        hashSink = std::make_unique<HashModuloSink>(*info->narHash.type, std::string(info->path.hashPart()));
 
                     store->narFromPath(info->path, *hashSink);