Merge branch 'master' into add-trace

src/libstore/build.cc

@@ -1950,8 +1950,11 @@ void linkOrCopy(const Path & from, const Path & to)
         /* Hard-linking fails if we exceed the maximum link count on a
            file (e.g. 32000 of ext3), which is quite possible after a
            'nix-store --optimise'. FIXME: actually, why don't we just
-           bind-mount in this case? */
-        if (errno != EMLINK)
+           bind-mount in this case?
+           
+           It can also fail with EPERM in BeegFS v7 and earlier versions
+           which don't allow hard-links to other directories */
+        if (errno != EMLINK && errno != EPERM)
             throw SysError("linking '%s' to '%s'", to, from);
         copyPath(from, to);
     }

src/libstore/builtins/fetchurl.cc

@@ -58,13 +58,16 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
         }
     };
 
+    /* We always have one output, and if it's a fixed-output derivation (as
+       checked below) it must be the only output */
+    auto & output = drv.outputs.begin()->second;
+
     /* Try the hashed mirrors first. */
-    if (getAttr("outputHashMode") == "flat")
+    if (output.hash && output.hash->method == FileIngestionMethod::Flat)
         for (auto hashedMirror : settings.hashedMirrors.get())
             try {
                 if (!hasSuffix(hashedMirror, "/")) hashedMirror += '/';
-                auto ht = parseHashTypeOpt(getAttr("outputHashAlgo"));
-                auto h = Hash(getAttr("outputHash"), ht);
+                auto & h = output.hash->hash;
                 fetch(hashedMirror + printHashType(*h.type) + "/" + h.to_string(Base16, false));
                 return;
             } catch (Error & e) {

src/libstore/derivations.cc

@@ -404,7 +404,7 @@ static DerivationOutput readDerivationOutput(Source & in, const Store & store)
 {
     auto path = store.parseStorePath(readString(in));
     auto hashAlgo = readString(in);
-    const auto hash = readString(in);
+    auto hash = readString(in);
 
     std::optional<FixedOutputHash> fsh;
     if (hashAlgo != "") {
@@ -413,7 +413,7 @@ static DerivationOutput readDerivationOutput(Source & in, const Store & store)
             method = FileIngestionMethod::Recursive;
             hashAlgo = string(hashAlgo, 2);
         }
-        const HashType hashType = parseHashType(hashAlgo);
+        auto hashType = parseHashType(hashAlgo);
         fsh = FixedOutputHash {
             .method = std::move(method),
             .hash = Hash(hash, hashType),
@@ -463,11 +463,16 @@ Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv)
 void writeDerivation(Sink & out, const Store & store, const BasicDerivation & drv)
 {
     out << drv.outputs.size();
-    for (auto & i : drv.outputs)
+    for (auto & i : drv.outputs) {
         out << i.first
-            << store.printStorePath(i.second.path)
-            << i.second.hash->printMethodAlgo()
-            << i.second.hash->hash.to_string(Base16, false);
+            << store.printStorePath(i.second.path);
+        if (i.second.hash) {
+            out << i.second.hash->printMethodAlgo()
+                << i.second.hash->hash.to_string(Base16, false);
+        } else {
+            out << "" << "";
+        }
+    }
     writeStorePaths(store, out, drv.inputSrcs);
     out << drv.platform << drv.builder << drv.args;
     out << drv.env.size();

src/libutil/archive.cc

@@ -262,7 +262,7 @@ static void parse(ParseSink & sink, Source & source, const Path & path)
                             names[name] = 0;
                     }
                 } else if (s == "node") {
-                    if (s.empty()) throw badArchive("entry name missing");
+                    if (name.empty()) throw badArchive("entry name missing");
                     parse(sink, source, path + "/" + name);
                 } else
                     throw badArchive("unknown field " + s);

src/libutil/error.hh

@@ -82,7 +82,11 @@ struct ErrPos {
         origin = pos.origin;
         line = pos.line;
         column = pos.column;
-        file = pos.file;
+        // is file symbol null?
+        if (pos.file.set())
+            file = pos.file;
+        else
+            file = "";
         return *this;
     }
 

src/libutil/hash.cc

@@ -19,7 +19,7 @@ namespace nix {
 
 void Hash::init()
 {
-    if (!type) abort();
+    assert(type);
     switch (*type) {
     case htMD5: hashSize = md5HashSize; break;
     case htSHA1: hashSize = sha1HashSize; break;
@@ -101,15 +101,15 @@ static string printHash32(const Hash & hash)
 
 string printHash16or32(const Hash & hash)
 {
+    assert(hash.type);
     return hash.to_string(hash.type == htMD5 ? Base16 : Base32, false);
 }
 
 
-HashType assertInitHashType(const Hash & h) {
-    if (h.type)
-        return *h.type;
-    else
-        abort();
+HashType assertInitHashType(const Hash & h)
+{
+    assert(h.type);
+    return *h.type;
 }
 
 std::string Hash::to_string(Base base, bool includeType) const
@@ -363,14 +363,15 @@ HashType parseHashType(const string & s)
 string printHashType(HashType ht)
 {
     switch (ht) {
-    case htMD5: return "md5"; break;
-    case htSHA1: return "sha1"; break;
-    case htSHA256: return "sha256"; break;
-    case htSHA512: return "sha512"; break;
+    case htMD5: return "md5";
+    case htSHA1: return "sha1";
+    case htSHA256: return "sha256";
+    case htSHA512: return "sha512";
+    default:
+        // illegal hash type enum value internally, as opposed to external input
+        // which should be validated with nice error message.
+        abort();
     }
-    // illegal hash type enum value internally, as opposed to external input
-    // which should be validated with nice error message.
-    abort();
 }
 
 }

src/libutil/hash.hh

@@ -10,7 +10,7 @@ namespace nix {
 MakeError(BadHash, Error);
 
 
-enum HashType : char { htMD5, htSHA1, htSHA256, htSHA512 };
+enum HashType : char { htMD5 = 42, htSHA1, htSHA256, htSHA512 };
 
 
 const int md5HashSize = 16;

src/libutil/tests/logging.cc

@@ -334,4 +334,22 @@ namespace nix {
             "what about this " ANSI_YELLOW "%3%" ANSI_NORMAL " " ANSI_YELLOW "one" ANSI_NORMAL);
 
     }
+
+    /* ----------------------------------------------------------------------------
+     * ErrPos
+     * --------------------------------------------------------------------------*/
+
+    TEST(errpos, invalidPos) {
+
+      // contains an invalid symbol, which we should not dereference!
+      Pos invalid;
+
+      // constructing without access violation.
+      ErrPos ep(invalid);
+    
+      // assignment without access violation.
+      ep = invalid;
+
+    }
+
 }