7 files changed, 60 insertions, 5 deletions
diff --git a/src/libexpr/local.mk b/src/libexpr/local.mk
index 35e84980a6dd..4c1f4de19187 100644
--- a/src/libexpr/local.mk
+++ b/src/libexpr/local.mk
@@ -8,7 +8,7 @@ libexpr_SOURCES := $(wildcard $(d)/*.cc) $(d)/lexer-tab.cc $(d)/parser-tab.cc
 
 libexpr_LIBS = libutil libstore libformat
 
-libexpr_LDFLAGS = -ldl -lcurl
+libexpr_LDFLAGS = -ldl
 
 # The dependency on libgc must be propagated (i.e. meaning that
 # programs/libraries that use libexpr must explicitly pass -lgc),
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 61677d1eb5a2..46d2841dc9e4 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -8,6 +8,7 @@
 #include "util.hh"
 #include "archive.hh"
 #include "affinity.hh"
+#include "builtins.hh"
 
 #include <map>
 #include <sstream>
@@ -1269,6 +1270,12 @@ bool substitutesAllowed(const BasicDerivation & drv)
 }
 
 
+static bool isBuiltin(const BasicDerivation & drv)
+{
+    return string(drv.builder, 0, 8) == "builtin:";
+}
+
+
 void DerivationGoal::tryToBuild()
 {
     trace("trying to build");
@@ -2139,7 +2146,7 @@ void DerivationGoal::startBuilder()
 #endif
     {
         ProcessOptions options;
-        options.allowVfork = !buildUser.enabled();
+        options.allowVfork = !buildUser.enabled() && !isBuiltin(*drv);
         pid = startProcess([&]() {
             runChild();
         }, options);
@@ -2386,7 +2393,9 @@ void DerivationGoal::runChild()
         const char *builder = "invalid";
 
         string sandboxProfile;
-        if (useChroot && SANDBOX_ENABLED) {
+        if (isBuiltin(*drv))
+            ;
+        else if (useChroot && SANDBOX_ENABLED) {
             /* Lots and lots and lots of file functions freak out if they can't stat their full ancestry */
             PathSet ancestry;
 
@@ -2413,7 +2422,6 @@ void DerivationGoal::runChild()
             for (auto & i : inputPaths)
                 dirsInChroot[i] = i;
 
-
             /* TODO: we should factor out the policy cleanly, so we don't have to repeat the constants every time... */
             sandboxProfile += "(version 1)\n";
 
@@ -2517,6 +2525,20 @@ void DerivationGoal::runChild()
         }
 
         /* Execute the program.  This should not return. */
+        if (isBuiltin(*drv)) {
+            try {
+                logType = ltFlat;
+                if (drv->builder == "builtin:fetchurl")
+                    builtinFetchurl(*drv);
+                else
+                    throw Error(format("unsupported builtin function ‘%1%’") % string(drv->builder, 8));
+                _exit(0);
+            } catch (std::exception & e) {
+                writeFull(STDERR_FILENO, "error: " + string(e.what()) + "\n");
+                _exit(1);
+            }
+        }
+
         execve(builder, stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
 
         throw SysError(format("executing ‘%1%’") % drv->builder);
diff --git a/src/libstore/builtins.cc b/src/libstore/builtins.cc
new file mode 100644
index 000000000000..97d6cb943402
--- /dev/null
+++ b/src/libstore/builtins.cc
@@ -0,0 +1,24 @@
+#include "builtins.hh"
+#include "download.hh"
+
+namespace nix {
+
+void builtinFetchurl(const BasicDerivation & drv)
+{
+    auto url = drv.env.find("url");
+    if (url == drv.env.end()) throw Error("attribute ‘url’ missing");
+    printMsg(lvlInfo, format("downloading ‘%1%’...") % url->second);
+    auto data = downloadFile(url->second); // FIXME: show progress
+
+    auto out = drv.env.find("out");
+    if (out == drv.env.end()) throw Error("attribute ‘url’ missing");
+    writeFile(out->second, data.data);
+
+    auto executable = drv.env.find("out");
+    if (executable != drv.env.end() && executable->second == "1") {
+        if (chmod(out->second.c_str(), 0755) == -1)
+            throw SysError(format("making ‘%1%’ executable") % out->second);
+    }
+}
+
+}
diff --git a/src/libstore/builtins.hh b/src/libstore/builtins.hh
new file mode 100644
index 000000000000..4b2431aa08cf
--- /dev/null
+++ b/src/libstore/builtins.hh
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "derivations.hh"
+
+namespace nix {
+
+void builtinFetchurl(const BasicDerivation & drv);
+
+}
diff --git a/src/libexpr/download.cc b/src/libstore/download.cc
index 9bf3e13aa9da..9bf3e13aa9da 100644
--- a/src/libexpr/download.cc
+++ b/src/libstore/download.cc
diff --git a/src/libexpr/download.hh b/src/libstore/download.hh
index 28c9117e4227..28c9117e4227 100644
--- a/src/libexpr/download.hh
+++ b/src/libstore/download.hh
diff --git a/src/libstore/local.mk b/src/libstore/local.mk
index 771c06753a65..bf5c256c949e 100644
--- a/src/libstore/local.mk
+++ b/src/libstore/local.mk
@@ -8,7 +8,7 @@ libstore_SOURCES := $(wildcard $(d)/*.cc)
 
 libstore_LIBS = libutil libformat
 
-libstore_LDFLAGS = -lsqlite3 -lbz2
+libstore_LDFLAGS = -lsqlite3 -lbz2 -lcurl
 
 ifeq ($(OS), SunOS)
 	libstore_LDFLAGS += -lsocket