Merge branch 'no-stringly-typed-derivation-output' of github.com:Ericson2314/nix into validPathInfo-ca-proper-datatype

14 files changed, 187 insertions, 94 deletions

diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 8fbcef8c8..b6e889e15 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -723,12 +723,9 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
         auto outPath = state.store->makeFixedOutputPath(ingestionMethod, h, drvName);
         if (!jsonObject) drv.env["out"] = state.store->printStorePath(outPath);
-        drv.outputs.insert_or_assign("out", DerivationOutput {
-            std::move(outPath),
-            (ingestionMethod == FileIngestionMethod::Recursive ? "r:" : "")
-                + printHashType(h.type),
-            h.to_string(Base::Base16, false),
-        });
+        drv.outputs.insert_or_assign("out", DerivationOutput(
+                std::move(outPath),
+                FileSystemHash(ingestionMethod, std::move(h))));
     }
 
     else {
@@ -741,7 +738,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
         for (auto & i : outputs) {
             if (!jsonObject) drv.env[i] = "";
             drv.outputs.insert_or_assign(i,
-                DerivationOutput(StorePath::dummy.clone(), "", ""));
+                DerivationOutput(StorePath::dummy.clone(), std::optional<FileSystemHash>()));
         }
 
         Hash h = hashDerivationModulo(*state.store, Derivation(drv), true);
@@ -750,7 +747,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
             auto outPath = state.store->makeOutputPath(i, h, drvName);
             if (!jsonObject) drv.env[i] = state.store->printStorePath(outPath);
             drv.outputs.insert_or_assign(i,
-                DerivationOutput(std::move(outPath), "", ""));
+                DerivationOutput(std::move(outPath), std::optional<FileSystemHash>()));
         }
     }
 
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index ae7ba6549..e35044532 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3712,10 +3712,7 @@ void DerivationGoal::registerOutputs()
 
         if (fixedOutput) {
 
-            FileIngestionMethod outputHashMode; Hash h;
-            i.second.parseHashInfo(outputHashMode, h);
-
-            if (outputHashMode == FileIngestionMethod::Flat) {
+            if (i.second.hash->method == FileIngestionMethod::Flat) {
                 /* The output path should be a regular file without execute permission. */
                 if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
                     throw BuildError(
@@ -3725,20 +3722,22 @@ void DerivationGoal::registerOutputs()
 
             /* Check the hash. In hash mode, move the path produced by
                the derivation to its content-addressed location. */
-            Hash h2 = outputHashMode == FileIngestionMethod::Recursive
-                ? hashPath(h.type, actualPath).first
-                : hashFile(h.type, actualPath);
+            Hash h2 = i.second.hash->method == FileIngestionMethod::Recursive
+                ? hashPath(i.second.hash->hash.type, actualPath).first
+                : hashFile(i.second.hash->hash.type, actualPath);
 
-            auto dest = worker.store.makeFixedOutputPath(outputHashMode, h2, i.second.path.name());
+            auto dest = worker.store.makeFixedOutputPath(i.second.hash->method, h2, i.second.path.name());
 
-            if (h != h2) {
+            if (i.second.hash->hash != h2) {
 
                 /* Throw an error after registering the path as
                    valid. */
                 worker.hashMismatch = true;
                 delayedException = std::make_exception_ptr(
                     BuildError("hash mismatch in fixed-output derivation '%s':\n  wanted: %s\n  got:    %s",
-                        worker.store.printStorePath(dest), h.to_string(Base::SRI), h2.to_string(Base::SRI)));
+                        worker.store.printStorePath(dest),
+                        i.second.hash->hash.to_string(Base::SRI),
+                        h2.to_string(Base::SRI)));
 
                 Path actualDest = worker.store.Store::toRealPath(dest);
 
@@ -3758,7 +3757,7 @@ void DerivationGoal::registerOutputs()
             else
                 assert(worker.store.parseStorePath(path) == dest);
 
-            ca = makeFixedOutputCA(outputHashMode, h2);
+            ca = makeFixedOutputCA(i.second.hash->method, h2);
         }
 
         /* Get rid of all weird permissions.  This also checks that
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index a90c9b86c..ad4d02c2c 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -8,22 +8,8 @@
 
 namespace nix {
 
-
-void DerivationOutput::parseHashInfo(FileIngestionMethod & recursive, Hash & hash) const
-{
-    recursive = FileIngestionMethod::Flat;
-    string algo = hashAlgo;
-
-    if (string(algo, 0, 2) == "r:") {
-        recursive = FileIngestionMethod::Recursive;
-        algo = string(algo, 2);
-    }
-
-    HashType hashType = parseHashType(algo);
-    if (hashType == HashType::Unknown)
-        throw Error("unknown hash algorithm '%s'", algo);
-
-    hash = Hash(this->hash, hashType);
+std::string FileSystemHash::printMethodAlgo() const {
+    return makeFileIngestionPrefix(method) + printHashType(hash.type);
 }
 
 
@@ -35,7 +21,7 @@ BasicDerivation::BasicDerivation(const BasicDerivation & other)
 {
     for (auto & i : other.outputs)
         outputs.insert_or_assign(i.first,
-            DerivationOutput(i.second.path.clone(), std::string(i.second.hashAlgo), std::string(i.second.hash)));
+            DerivationOutput(i.second.path.clone(), std::optional<FileSystemHash>(i.second.hash)));
     for (auto & i : other.inputSrcs)
         inputSrcs.insert(i.clone());
 }
@@ -142,6 +128,33 @@ static StringSet parseStrings(std::istream & str, bool arePaths)
 }
 
 
+static DerivationOutput parseDerivationOutput(const Store & store, istringstream_nocopy & str)
+{
+    expect(str, ","); auto path = store.parseStorePath(parsePath(str));
+    expect(str, ","); auto hashAlgo = parseString(str);
+    expect(str, ","); const auto hash = parseString(str);
+    expect(str, ")");
+
+    auto method = FileIngestionMethod::Flat;
+    std::optional<FileSystemHash> fsh;
+    if (hashAlgo != "") {
+        if (string(hashAlgo, 0, 2) == "r:") {
+            method = FileIngestionMethod::Recursive;
+            hashAlgo = string(hashAlgo, 2);
+        }
+        const HashType hashType = parseHashType(hashAlgo);
+        if (hashType == HashType::Unknown)
+            throw Error("unknown hash hashAlgorithm '%s'", hashAlgo);
+        fsh = FileSystemHash {
+            std::move(method),
+            Hash(hash, hashType),
+        };
+    }
+
+    return DerivationOutput(std::move(path), std::move(fsh));
+}
+
+
 static Derivation parseDerivation(const Store & store, const string & s)
 {
     Derivation drv;
@@ -151,11 +164,7 @@ static Derivation parseDerivation(const Store & store, const string & s)
     /* Parse the list of outputs. */
     while (!endOfList(str)) {
         expect(str, "("); std::string id = parseString(str);
-        expect(str, ","); auto path = store.parseStorePath(parsePath(str));
-        expect(str, ","); auto hashAlgo = parseString(str);
-        expect(str, ","); auto hash = parseString(str);
-        expect(str, ")");
-        drv.outputs.emplace(id, DerivationOutput(std::move(path), std::move(hashAlgo), std::move(hash)));
+        drv.outputs.emplace(id, parseDerivationOutput(store, str));
     }
 
     /* Parse the list of input derivations. */
@@ -275,8 +284,9 @@ string Derivation::unparse(const Store & store, bool maskOutputs,
         if (first) first = false; else s += ',';
         s += '('; printUnquotedString(s, i.first);
         s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(i.second.path));
-        s += ','; printUnquotedString(s, i.second.hashAlgo);
-        s += ','; printUnquotedString(s, i.second.hash);
+        s += ','; printUnquotedString(s, i.second.hash ? i.second.hash->printMethodAlgo() : "");
+        s += ','; printUnquotedString(s,
+            i.second.hash ? i.second.hash->hash.to_string(Base::Base16, false) : "");
         s += ')';
     }
 
@@ -332,7 +342,7 @@ bool BasicDerivation::isFixedOutput() const
 {
     return outputs.size() == 1 &&
         outputs.begin()->first == "out" &&
-        outputs.begin()->second.hash != "";
+        outputs.begin()->second.hash;
 }
 
 
@@ -365,8 +375,8 @@ Hash hashDerivationModulo(Store & store, const Derivation & drv, bool maskOutput
     if (drv.isFixedOutput()) {
         DerivationOutputs::const_iterator i = drv.outputs.begin();
         return hashString(HashType::SHA256, "fixed:out:"
-            + i->second.hashAlgo + ":"
-            + i->second.hash + ":"
+            + i->second.hash->printMethodAlgo() + ":"
+            + i->second.hash->hash.to_string(Base::Base16, false) + ":"
             + store.printStorePath(i->second.path));
     }
 
@@ -409,6 +419,30 @@ StorePathSet BasicDerivation::outputPaths() const
     return paths;
 }
 
+static DerivationOutput readDerivationOutput(Source & in, const Store & store)
+{
+    auto path = store.parseStorePath(readString(in));
+    auto hashAlgo = readString(in);
+    const auto hash = readString(in);
+
+    auto method = FileIngestionMethod::Flat;
+    std::optional<FileSystemHash> fsh;
+    if (hashAlgo != "") {
+        if (string(hashAlgo, 0, 2) == "r:") {
+            method = FileIngestionMethod::Recursive;
+            hashAlgo = string(hashAlgo, 2);
+        }
+        HashType hashType = parseHashType(hashAlgo);
+        if (hashType == HashType::Unknown)
+            throw Error("unknown hash hashAlgorithm '%s'", hashAlgo);
+        fsh = FileSystemHash {
+            std::move(method),
+            Hash(hash, hashType),
+        };
+    }
+
+    return DerivationOutput(std::move(path), std::move(fsh));
+}
 
 Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv)
 {
@@ -416,10 +450,8 @@ Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv)
     auto nr = readNum<size_t>(in);
     for (size_t n = 0; n < nr; n++) {
         auto name = readString(in);
-        auto path = store.parseStorePath(readString(in));
-        auto hashAlgo = readString(in);
-        auto hash = readString(in);
-        drv.outputs.emplace(name, DerivationOutput(std::move(path), std::move(hashAlgo), std::move(hash)));
+        auto output = readDerivationOutput(in, store);
+        drv.outputs.emplace(name, output);
     }
 
     drv.inputSrcs = readStorePaths<StorePathSet>(store, in);
@@ -441,7 +473,10 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
 {
     out << drv.outputs.size();
     for (auto & i : drv.outputs)
-        out << i.first << store.printStorePath(i.second.path) << i.second.hashAlgo << i.second.hash;
+        out << i.first
+            << store.printStorePath(i.second.path)
+            << i.second.hash->printMethodAlgo()
+            << i.second.hash->hash.to_string(Base::Base16, false);
     writeStorePaths(store, out, drv.inputSrcs);
     out << drv.platform << drv.builder << drv.args;
     out << drv.env.size();
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index b1224b93b..46de3960e 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -12,16 +12,31 @@ 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;
-    std::string hashAlgo; /* hash used for expected hash computation */
-    std::string hash; /* expected hash, may be null */
-    DerivationOutput(StorePath && path, std::string && hashAlgo, std::string && hash)
+    std::optional<FileSystemHash> hash; /* hash used for expected hash computation */
+    DerivationOutput(StorePath && path, std::optional<FileSystemHash> && hash)
         : path(std::move(path))
-        , hashAlgo(std::move(hashAlgo))
         , hash(std::move(hash))
     { }
+    DerivationOutput(const DerivationOutput &) = default;
+    DerivationOutput(DerivationOutput &&) = default;
+    DerivationOutput & operator = (const DerivationOutput &) = default;
     void parseHashInfo(FileIngestionMethod & recursive, Hash & hash) const;
 };
 
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 7f0d5af25..9b60bf887 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -557,10 +557,12 @@ void LocalStore::checkDerivationOutputs(const StorePath & drvPath, const Derivat
         if (out == drv.outputs.end())
             throw Error("derivation '%s' does not have an output named 'out'", printStorePath(drvPath));
 
-        FileIngestionMethod method; Hash h;
-        out->second.parseHashInfo(method, h);
-
-        check(makeFixedOutputPath(method, h, drvName), out->second.path, "out");
+        check(
+            makeFixedOutputPath(
+                out->second.hash->method,
+                out->second.hash->hash,
+                drvName),
+            out->second.path, "out");
     }
 
     else {
diff --git a/src/libstore/nar-info.cc b/src/libstore/nar-info.cc
index a35886302..8592ee968 100644
--- a/src/libstore/nar-info.cc
+++ b/src/libstore/nar-info.cc
@@ -4,7 +4,7 @@
 namespace nix {
 
 NarInfo::NarInfo(const Store & store, const std::string & s, const std::string & whence)
-    : ValidPathInfo(StorePath::dummy.clone()) // FIXME: hack
+    : ValidPathInfo(StorePath::dummy) // FIXME: hack
 {
     auto corrupt = [&]() {
         throw Error(format("NAR info file '%1%' is corrupt") % whence);
diff --git a/src/libstore/path.hh b/src/libstore/path.hh
index 5122e7422..f3ed6ca39 100644
--- a/src/libstore/path.hh
+++ b/src/libstore/path.hh
@@ -13,6 +13,7 @@ extern "C" {
     void ffi_StorePath_drop(void *);
     bool ffi_StorePath_less_than(const StorePath & a, const StorePath & b);
     bool ffi_StorePath_eq(const StorePath & a, const StorePath & b);
+    void ffi_StorePath_clone_to(const StorePath & _other, StorePath & _this);
     unsigned char * ffi_StorePath_hash_data(const StorePath & p);
 }
 
@@ -43,6 +44,19 @@ struct StorePath : rust::Value<3 * sizeof(void *) + 24, ffi_StorePath_drop>
         return !(*this == other);
     }
 
+    StorePath(StorePath && that) = default;
+
+    StorePath(const StorePath & that)
+    {
+        ffi_StorePath_clone_to(that, *this);
+    }
+
+    void operator = (const StorePath & that)
+    {
+        (rust::Value<3 * sizeof(void *) + 24, ffi_StorePath_drop>::operator = (that));
+        ffi_StorePath_clone_to(that, *this);
+    }
+
     StorePath clone() const;
 
     /* Check whether a file name ends with the extension for
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index ff4832ffa..b7ba9e4f2 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -172,22 +172,19 @@ static std::string makeType(
 
 
 StorePath Store::makeFixedOutputPath(
-    FileIngestionMethod recursive,
+    FileIngestionMethod method,
     const Hash & hash,
     std::string_view name,
     const StorePathSet & references,
     bool hasSelfReference) const
 {
-    if (hash.type == HashType::SHA256 && recursive == FileIngestionMethod::Recursive) {
+    if (hash.type == HashType::SHA256 && method == FileIngestionMethod::Recursive) {
         return makeStorePath(makeType(*this, "source", references, hasSelfReference), hash, name);
     } else {
         assert(references.empty());
-        return makeStorePath("output:out",
-            hashString(HashType::SHA256,
-                "fixed:out:"
-                + (recursive == FileIngestionMethod::Recursive ? (string) "r:" : "")
-                + hash.to_string(Base::Base16) + ":"),
-            name);
+        return makeStorePath("output:out", hashString(HashType::SHA256,
+                "fixed:out:" + makeFileIngestionPrefix(method) +
+                hash.to_string(Base::Base16) + ":"), name);
     }
 }
 
@@ -693,21 +690,6 @@ void copyClosure(ref<Store> srcStore, ref<Store> dstStore,
 }
 
 
-ValidPathInfo::ValidPathInfo(const ValidPathInfo & other)
-    : path(other.path.clone())
-    , deriver(other.deriver ? other.deriver->clone(): std::optional<StorePath>{})
-    , narHash(other.narHash)
-    , references(cloneStorePathSet(other.references))
-    , registrationTime(other.registrationTime)
-    , narSize(other.narSize)
-    , id(other.id)
-    , ultimate(other.ultimate)
-    , sigs(other.sigs)
-    , ca(other.ca)
-{
-}
-
-
 std::optional<ValidPathInfo> decodeValidPathInfo(const Store & store, std::istream & str, bool hashGiven)
 {
     std::string path;
@@ -832,10 +814,21 @@ Strings ValidPathInfo::shortRefs() const
 }
 
 
-std::string makeFixedOutputCA(FileIngestionMethod recursive, const Hash & hash)
+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:"
-        + (recursive == FileIngestionMethod::Recursive ? (std::string) "r:" : "")
+        + makeFileIngestionPrefix(method)
         + hash.to_string();
 }
 
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 46dd261df..00ecf0bd9 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -189,8 +189,9 @@ struct ValidPathInfo
 
     Strings shortRefs() const;
 
-    ValidPathInfo(StorePath && path) : path(std::move(path)) { }
-    explicit ValidPathInfo(const ValidPathInfo & other);
+    ValidPathInfo(StorePath && path) : path(std::move(path)) { };
+    ValidPathInfo(const StorePath & path) : path(path) { };
+    ValidPathInfo(const ValidPathInfo & other) = default;
 
     virtual ~ValidPathInfo() { }
 };
@@ -847,6 +848,9 @@ 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(). */
diff --git a/src/libutil/hash.hh b/src/libutil/hash.hh
index 0fe6e7677..da557e585 100644
--- a/src/libutil/hash.hh
+++ b/src/libutil/hash.hh
@@ -55,6 +55,12 @@ struct Hash
        string. */
     Hash(const std::string & s, HashType type = HashType::Unknown);
 
+    Hash(const Hash &) = default;
+
+    Hash(Hash &&) = default;
+
+    Hash & operator = (const Hash &) = default;
+
     void init();
 
     /* Check whether a hash is set. */
diff --git a/src/libutil/rust-ffi.hh b/src/libutil/rust-ffi.hh
index 228e2eead..8b61b6d00 100644
--- a/src/libutil/rust-ffi.hh
+++ b/src/libutil/rust-ffi.hh
@@ -30,7 +30,10 @@ protected:
 
     // Must not be called directly.
     Value()
-    { }
+    {
+        // Precaution, in case this is used improperly
+        evacuate();
+    }
 
     Value(Value && other)
         : raw(other.raw)
@@ -38,6 +41,19 @@ protected:
         other.evacuate();
     }
 
+    // Not all Rust types are Clone / Copy, but our base Value class needs to
+    // have a copy constructor so that types which do implement Copy/Clone
+    // can be copied/cloned.
+    Value(const Value & other)
+        : raw(other.raw)
+    {
+    }
+    void operator =(const Value & other)
+    {
+        if (!isEvacuated())
+            drop(this);
+    }
+
     void operator =(Value && other)
     {
         if (!isEvacuated())
@@ -76,6 +92,16 @@ struct Vec : Value<3 * sizeof(void *), drop>
     {
         return ((const T * *) &this->raw)[0];
     }
+
+protected:
+
+    // Must not be called directly.
+    Vec<T, drop>();
+
+    Vec<T, drop>(Vec<T, drop> && other) = default;
+
+    // Delete until we know how to do this properly.
+    Vec<T, drop>(const Vec<T, drop> & other) = delete;
 };
 
 /* A Rust slice. */
@@ -144,7 +170,7 @@ struct Result
         std::exception_ptr * exc;
     };
 
-    Result() : tag(Uninit) { }; // FIXME: remove
+    Result() = delete;
 
     Result(const Result &) = delete;
 
@@ -171,7 +197,7 @@ struct Result
     }
 
     /* Rethrow the wrapped exception or return the wrapped value. */
-    T unwrap()
+    T unwrap() &&
     {
         if (tag == Ok) {
             tag = Uninit;
diff --git a/src/libutil/tests/libutil-tests b/src/libutil/tests/libutil-tests
new file mode 100755
index 000000000..919c401a1
--- /dev/null
+++ b/src/libutil/tests/libutil-tests
diff --git a/src/nix/dev-shell.cc b/src/nix/dev-shell.cc
index d300f6a23..337d7750e 100644
--- a/src/nix/dev-shell.cc
+++ b/src/nix/dev-shell.cc
@@ -135,7 +135,9 @@ 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.clone(), "", ""));
+    drv.outputs.insert_or_assign("out", DerivationOutput(shellOutPath.clone(), FileSystemHash {
+        FileIngestionMethod::Flat, Hash { }
+    }));
     drv.env["out"] = store->printStorePath(shellOutPath);
     auto shellDrvPath2 = writeDerivation(store, drv, drvName);
 
diff --git a/src/nix/show-derivation.cc b/src/nix/show-derivation.cc
index 22c569f3c..87387002d 100644
--- a/src/nix/show-derivation.cc
+++ b/src/nix/show-derivation.cc
@@ -72,9 +72,9 @@ 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(Base::Base16, false));
                     }
                 }
             }