From d4dcffd64349bb52ad5f1b184bee5cc7c2be73b4 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 16 Jan 2018 18:50:38 +0100
Subject: [PATCH] Add pure evaluation mode

In this mode, the following restrictions apply:

* The builtins currentTime, currentSystem and storePath throw an
  error.

* $NIX_PATH and -I are ignored.

* fetchGit and fetchMercurial require a revision hash.

* fetchurl and fetchTarball require a sha256 attribute.

* No file system access is allowed outside of the paths returned by
  fetch{Git,Mercurial,url,Tarball}. Thus 'nix build -f ./foo.nix' is
  not allowed.

Thus, the evaluation result is completely reproducible from the
command line arguments. E.g.

  nix build --pure-eval '(
    let
      nix = fetchGit { url = https://github.com/NixOS/nixpkgs.git; rev = "9c927de4b179a6dd210dd88d34bda8af4b575680"; };
      nixpkgs = fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-17.09"; rev = "66b4de79e3841530e6d9c6baf98702aa1f7124e4"; };
    in (import (nix + "/release.nix") { inherit nix nixpkgs; }).build.x86_64-linux
  )'

The goal is to enable completely reproducible and traceable
evaluation. For example, a NixOS configuration could be fully
described by a single Git commit hash. 'nixos-rebuild' would do
something like

  nix build --pure-eval '(
    (import (fetchGit { url = file:///my-nixos-config; rev = "..."; })).system
  ')

where the Git repository /my-nixos-config would use further fetchGit
calls or Git externals to fetch Nixpkgs and whatever other
dependencies it has. Either way, the commit hash would uniquely
identify the NixOS configuration and allow it to reproduced.
---
 mk/tests.mk                            |  2 +-
 release.nix                            |  2 +-
 src/libexpr/eval.cc                    | 65 +++++++++++++++-----------
 src/libexpr/eval.hh                    |  8 ++--
 src/libexpr/primops.cc                 | 44 +++++++++++++----
 src/libexpr/primops/fetchGit.cc        | 15 ++++--
 src/libexpr/primops/fetchMercurial.cc  |  6 +++
 src/libstore/globals.hh                |  3 ++
 src/libutil/util.cc                    |  6 +++
 src/libutil/util.hh                    |  6 ++-
 src/nix-build/nix-build.cc             |  4 +-
 src/nix-instantiate/nix-instantiate.cc |  2 +-
 tests/fetchGit.sh                      |  7 +++
 tests/fetchMercurial.sh                |  7 +++
 tests/local.mk                         |  3 +-
 tests/pure-eval.nix                    |  3 ++
 tests/pure-eval.sh                     | 18 +++++++
 tests/restricted.nix                   |  1 +
 tests/restricted.sh                    | 10 +++-
 19 files changed, 159 insertions(+), 53 deletions(-)
 create mode 100644 tests/pure-eval.nix
 create mode 100644 tests/pure-eval.sh
 create mode 100644 tests/restricted.nix

diff --git a/mk/tests.mk b/mk/tests.mk
index e353d46a0d0..70c30661b95 100644
--- a/mk/tests.mk
+++ b/mk/tests.mk
@@ -39,7 +39,7 @@ installcheck:
 	  echo "$${red}$$failed out of $$total tests failed $$normal"; \
 	  exit 1; \
 	else \
-		echo "$${green}All tests succeeded"; \
+		echo "$${green}All tests succeeded$$normal"; \
 	fi
 
 .PHONY: check installcheck
diff --git a/release.nix b/release.nix
index 30bec2a6e3e..04f1f836743 100644
--- a/release.nix
+++ b/release.nix
@@ -6,7 +6,7 @@
 
 let
 
-  pkgs = import nixpkgs {};
+  pkgs = import nixpkgs { system = "x86_64-linux"; };
 
   jobs = rec {
 
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 087a95ddef8..f8685e010e1 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -300,16 +300,25 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
 {
     countCalls = getEnv("NIX_COUNT_CALLS", "0") != "0";
 
-    restricted = settings.restrictEval;
-
     assert(gcInitialised);
 
     /* Initialise the Nix expression search path. */
-    Strings paths = parseNixPath(getEnv("NIX_PATH", ""));
-    for (auto & i : _searchPath) addToSearchPath(i);
-    for (auto & i : paths) addToSearchPath(i);
+    if (!settings.pureEval) {
+        Strings paths = parseNixPath(getEnv("NIX_PATH", ""));
+        for (auto & i : _searchPath) addToSearchPath(i);
+        for (auto & i : paths) addToSearchPath(i);
+    }
     addToSearchPath("nix=" + settings.nixDataDir + "/nix/corepkgs");
 
+    if (settings.restrictEval || settings.pureEval) {
+        allowedPaths = PathSet();
+        for (auto & i : searchPath) {
+            auto r = resolveSearchPathElem(i);
+            if (!r.first) continue;
+            allowedPaths->insert(r.second);
+        }
+    }
+
     clearValue(vEmptySet);
     vEmptySet.type = tAttrs;
     vEmptySet.attrs = allocBindings(0);
@@ -326,38 +335,39 @@ EvalState::~EvalState()
 
 Path EvalState::checkSourcePath(const Path & path_)
 {
-    if (!restricted) return path_;
+    if (!allowedPaths) return path_;
+
+    auto doThrow = [&]() [[noreturn]] {
+        throw RestrictedPathError("access to path '%1%' is forbidden in restricted mode", path_);
+    };
+
+    bool found = false;
+
+    for (auto & i : *allowedPaths) {
+        if (isDirOrInDir(path_, i)) {
+            found = true;
+            break;
+        }
+    }
+
+    if (!found) doThrow();
 
     /* Resolve symlinks. */
     debug(format("checking access to '%s'") % path_);
     Path path = canonPath(path_, true);
 
-    for (auto & i : searchPath) {
-        auto r = resolveSearchPathElem(i);
-        if (!r.first) continue;
-        if (path == r.second || isInDir(path, r.second))
+    for (auto & i : *allowedPaths) {
+        if (isDirOrInDir(path, i))
             return path;
     }
 
-    /* To support import-from-derivation, allow access to anything in
-       the store. FIXME: only allow access to paths that have been
-       constructed by this evaluation. */
-    if (store->isInStore(path)) return path;
-
-#if 0
-    /* Hack to support the chroot dependencies of corepkgs (see
-       corepkgs/config.nix.in). */
-    if (path == settings.nixPrefix && isStorePath(settings.nixPrefix))
-        return path;
-#endif
-
-    throw RestrictedPathError(format("access to path '%1%' is forbidden in restricted mode") % path_);
+    doThrow();
 }
 
 
 void EvalState::checkURI(const std::string & uri)
 {
-    if (!restricted) return;
+    if (!settings.restrictEval) return;
 
     /* 'uri' should be equal to a prefix, or in a subdirectory of a
        prefix. Thus, the prefix https://github.co does not permit
@@ -396,7 +406,7 @@ void EvalState::addConstant(const string & name, Value & v)
 }
 
 
-void EvalState::addPrimOp(const string & name,
+Value * EvalState::addPrimOp(const string & name,
     unsigned int arity, PrimOpFun primOp)
 {
     Value * v = allocValue();
@@ -407,6 +417,7 @@ void EvalState::addPrimOp(const string & name,
     staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
     baseEnv.values[baseEnvDispl++] = v;
     baseEnv.values[0]->attrs->push_back(Attr(sym, v));
+    return v;
 }
 
 
@@ -659,8 +670,10 @@ Value * ExprPath::maybeThunk(EvalState & state, Env & env)
 }
 
 
-void EvalState::evalFile(const Path & path, Value & v)
+void EvalState::evalFile(const Path & path_, Value & v)
 {
+    auto path = checkSourcePath(path_);
+
     FileEvalCache::iterator i;
     if ((i = fileEvalCache.find(path)) != fileEvalCache.end()) {
         v = i->second;
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index cc971ae80a4..9e3d30d95f4 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -76,9 +76,9 @@ public:
        already exist there. */
     RepairFlag repair;
 
-    /* If set, don't allow access to files outside of the Nix search
-       path or to environment variables. */
-    bool restricted;
+    /* The allowed filesystem paths in restricted or pure evaluation
+       mode. */
+    std::experimental::optional<PathSet> allowedPaths;
 
     Value vEmptySet;
 
@@ -212,7 +212,7 @@ private:
 
     void addConstant(const string & name, Value & v);
 
-    void addPrimOp(const string & name,
+    Value * addPrimOp(const string & name,
         unsigned int arity, PrimOpFun primOp);
 
 public:
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 98fe2199e9f..0ec035b8624 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -439,7 +439,7 @@ static void prim_tryEval(EvalState & state, const Pos & pos, Value * * args, Val
 static void prim_getEnv(EvalState & state, const Pos & pos, Value * * args, Value & v)
 {
     string name = state.forceStringNoCtx(*args[0], pos);
-    mkString(v, state.restricted ? "" : getEnv(name));
+    mkString(v, settings.restrictEval || settings.pureEval ? "" : getEnv(name));
 }
 
 
@@ -1929,7 +1929,14 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
 
     state.checkURI(url);
 
+    if (settings.pureEval && !expectedHash)
+        throw Error("in pure evaluation mode, '%s' requires a 'sha256' argument", who);
+
     Path res = getDownloader()->downloadCached(state.store, url, unpack, name, expectedHash);
+
+    if (state.allowedPaths)
+        state.allowedPaths->insert(res);
+
     mkString(v, res, PathSet({res}));
 }
 
@@ -1981,11 +1988,28 @@ void EvalState::createBaseEnv()
     mkNull(v);
     addConstant("null", v);
 
-    mkInt(v, time(0));
-    addConstant("__currentTime", v);
+    auto vThrow = addPrimOp("throw", 1, prim_throw);
 
-    mkString(v, settings.thisSystem);
-    addConstant("__currentSystem", v);
+    auto addPurityError = [&](const std::string & name) {
+        Value * v2 = allocValue();
+        mkString(*v2, fmt("'%s' is not allowed in pure evaluation mode", name));
+        mkApp(v, *vThrow, *v2);
+        addConstant(name, v);
+    };
+
+    if (settings.pureEval)
+        addPurityError("__currentTime");
+    else {
+        mkInt(v, time(0));
+        addConstant("__currentTime", v);
+    }
+
+    if (settings.pureEval)
+        addPurityError("__currentSystem");
+    else {
+        mkString(v, settings.thisSystem);
+        addConstant("__currentSystem", v);
+    }
 
     mkString(v, nixVersion);
     addConstant("__nixVersion", v);
@@ -2001,10 +2025,10 @@ void EvalState::createBaseEnv()
     addConstant("__langVersion", v);
 
     // Miscellaneous
-    addPrimOp("scopedImport", 2, prim_scopedImport);
+    auto vScopedImport = addPrimOp("scopedImport", 2, prim_scopedImport);
     Value * v2 = allocValue();
     mkAttrs(*v2, 0);
-    mkApp(v, *baseEnv.values[baseEnvDispl - 1], *v2);
+    mkApp(v, *vScopedImport, *v2);
     forceValue(v);
     addConstant("import", v);
     if (settings.enableNativeCode) {
@@ -2020,7 +2044,6 @@ void EvalState::createBaseEnv()
     addPrimOp("__isBool", 1, prim_isBool);
     addPrimOp("__genericClosure", 1, prim_genericClosure);
     addPrimOp("abort", 1, prim_abort);
-    addPrimOp("throw", 1, prim_throw);
     addPrimOp("__addErrorContext", 2, prim_addErrorContext);
     addPrimOp("__tryEval", 1, prim_tryEval);
     addPrimOp("__getEnv", 1, prim_getEnv);
@@ -2035,7 +2058,10 @@ void EvalState::createBaseEnv()
 
     // Paths
     addPrimOp("__toPath", 1, prim_toPath);
-    addPrimOp("__storePath", 1, prim_storePath);
+    if (settings.pureEval)
+        addPurityError("__storePath");
+    else
+        addPrimOp("__storePath", 1, prim_storePath);
     addPrimOp("__pathExists", 1, prim_pathExists);
     addPrimOp("baseNameOf", 1, prim_baseNameOf);
     addPrimOp("dirOf", 1, prim_dirOf);
diff --git a/src/libexpr/primops/fetchGit.cc b/src/libexpr/primops/fetchGit.cc
index fb664cffb5b..2e3e2634db8 100644
--- a/src/libexpr/primops/fetchGit.cc
+++ b/src/libexpr/primops/fetchGit.cc
@@ -22,10 +22,15 @@ struct GitInfo
     uint64_t revCount = 0;
 };
 
+std::regex revRegex("^[0-9a-fA-F]{40}$");
+
 GitInfo exportGit(ref<Store> store, const std::string & uri,
     std::experimental::optional<std::string> ref, std::string rev,
     const std::string & name)
 {
+    if (settings.pureEval && rev == "")
+        throw Error("in pure evaluation mode, 'fetchGit' requires a Git revision");
+
     if (!ref && rev == "" && hasPrefix(uri, "/") && pathExists(uri + "/.git")) {
 
         bool clean = true;
@@ -76,11 +81,8 @@ GitInfo exportGit(ref<Store> store, const std::string & uri,
 
     if (!ref) ref = "master"s;
 
-    if (rev != "") {
-        std::regex revRegex("^[0-9a-fA-F]{40}$");
-        if (!std::regex_match(rev, revRegex))
-            throw Error("invalid Git revision '%s'", rev);
-    }
+    if (rev != "" && !std::regex_match(rev, revRegex))
+        throw Error("invalid Git revision '%s'", rev);
 
     Path cacheDir = getCacheDir() + "/nix/git";
 
@@ -231,6 +233,9 @@ static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Va
     mkString(*state.allocAttr(v, state.symbols.create("shortRev")), gitInfo.shortRev);
     mkInt(*state.allocAttr(v, state.symbols.create("revCount")), gitInfo.revCount);
     v.attrs->sort();
+
+    if (state.allowedPaths)
+        state.allowedPaths->insert(gitInfo.storePath);
 }
 
 static RegisterPrimOp r("fetchGit", 1, prim_fetchGit);
diff --git a/src/libexpr/primops/fetchMercurial.cc b/src/libexpr/primops/fetchMercurial.cc
index a317476c582..5517d83df82 100644
--- a/src/libexpr/primops/fetchMercurial.cc
+++ b/src/libexpr/primops/fetchMercurial.cc
@@ -27,6 +27,9 @@ std::regex commitHashRegex("^[0-9a-fA-F]{40}$");
 HgInfo exportMercurial(ref<Store> store, const std::string & uri,
     std::string rev, const std::string & name)
 {
+    if (settings.pureEval && rev == "")
+        throw Error("in pure evaluation mode, 'fetchMercurial' requires a Mercurial revision");
+
     if (rev == "" && hasPrefix(uri, "/") && pathExists(uri + "/.hg")) {
 
         bool clean = runProgram("hg", true, { "status", "-R", uri, "--modified", "--added", "--removed" }) == "";
@@ -196,6 +199,9 @@ static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * ar
     mkString(*state.allocAttr(v, state.symbols.create("shortRev")), std::string(hgInfo.rev, 0, 12));
     mkInt(*state.allocAttr(v, state.symbols.create("revCount")), hgInfo.revCount);
     v.attrs->sort();
+
+    if (state.allowedPaths)
+        state.allowedPaths->insert(hgInfo.storePath);
 }
 
 static RegisterPrimOp r("fetchMercurial", 1, prim_fetchMercurial);
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index af72f7b1e35..81bb24a4eb3 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -232,6 +232,9 @@ public:
         "Whether to restrict file system access to paths in $NIX_PATH, "
         "and network access to the URI prefixes listed in 'allowed-uris'."};
 
+    Setting<bool> pureEval{this, false, "pure-eval",
+        "Whether to restrict file system and network access to files specified by cryptographic hash."};
+
     Setting<size_t> buildRepeat{this, 0, "repeat",
         "The number of times to repeat a build in order to verify determinism.",
         {"build-repeat"}};
diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 197df0c44aa..27299739779 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -192,6 +192,12 @@ bool isInDir(const Path & path, const Path & dir)
 }
 
 
+bool isDirOrInDir(const Path & path, const Path & dir)
+{
+    return path == dir or isInDir(path, dir);
+}
+
+
 struct stat lstat(const Path & path)
 {
     struct stat st;
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index a3494e09b09..75eb9751524 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -53,10 +53,12 @@ Path dirOf(const Path & path);
    following the final `/'. */
 string baseNameOf(const Path & path);
 
-/* Check whether a given path is a descendant of the given
-   directory. */
+/* Check whether 'path' is a descendant of 'dir'. */
 bool isInDir(const Path & path, const Path & dir);
 
+/* Check whether 'path' is equal to 'dir' or a descendant of 'dir'. */
+bool isDirOrInDir(const Path & path, const Path & dir);
+
 /* Get status of `path'. */
 struct stat lstat(const Path & path);
 
diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
index 58366daa6e8..1b249427537 100755
--- a/src/nix-build/nix-build.cc
+++ b/src/nix-build/nix-build.cc
@@ -279,8 +279,8 @@ void mainWrapped(int argc, char * * argv)
             else
                 /* If we're in a #! script, interpret filenames
                    relative to the script. */
-                exprs.push_back(state.parseExprFromFile(resolveExprPath(lookupFileArg(state,
-                    inShebang && !packages ? absPath(i, absPath(dirOf(script))) : i))));
+                exprs.push_back(state.parseExprFromFile(resolveExprPath(state.checkSourcePath(lookupFileArg(state,
+                    inShebang && !packages ? absPath(i, absPath(dirOf(script))) : i)))));
         }
 
     /* Evaluate them into derivations. */
diff --git a/src/nix-instantiate/nix-instantiate.cc b/src/nix-instantiate/nix-instantiate.cc
index 55ac007e868..e05040a42de 100644
--- a/src/nix-instantiate/nix-instantiate.cc
+++ b/src/nix-instantiate/nix-instantiate.cc
@@ -182,7 +182,7 @@ int main(int argc, char * * argv)
         for (auto & i : files) {
             Expr * e = fromArgs
                 ? state.parseExprFromString(i, absPath("."))
-                : state.parseExprFromFile(resolveExprPath(lookupFileArg(state, i)));
+                : state.parseExprFromFile(resolveExprPath(state.checkSourcePath(lookupFileArg(state, i))));
             processExpr(state, attrPaths, parseOnly, strict, autoArgs,
                 evalOnly, outputKind, xmlOutputSourceLocation, e);
         }
diff --git a/tests/fetchGit.sh b/tests/fetchGit.sh
index b556fe594ce..530ac7bb813 100644
--- a/tests/fetchGit.sh
+++ b/tests/fetchGit.sh
@@ -29,10 +29,17 @@ rev2=$(git -C $repo rev-parse HEAD)
 path=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
 [[ $(cat $path/hello) = world ]]
 
+# In pure eval mode, fetchGit without a revision should fail.
+[[ $(nix eval --raw "(builtins.readFile (fetchGit file://$repo + \"/hello\"))") = world ]]
+(! nix eval --pure-eval --raw "(builtins.readFile (fetchGit file://$repo + \"/hello\"))")
+
 # Fetch using an explicit revision hash.
 path2=$(nix eval --raw "(builtins.fetchGit { url = file://$repo; rev = \"$rev2\"; }).outPath")
 [[ $path = $path2 ]]
 
+# In pure eval mode, fetchGit with a revision should succeed.
+[[ $(nix eval --pure-eval --raw "(builtins.readFile (fetchGit { url = file://$repo; rev = \"$rev2\"; } + \"/hello\"))") = world ]]
+
 # Fetch again. This should be cached.
 mv $repo ${repo}-tmp
 path2=$(nix eval --raw "(builtins.fetchGit file://$repo).outPath")
diff --git a/tests/fetchMercurial.sh b/tests/fetchMercurial.sh
index 271350ecd17..4088dbd3979 100644
--- a/tests/fetchMercurial.sh
+++ b/tests/fetchMercurial.sh
@@ -29,10 +29,17 @@ rev2=$(hg log --cwd $repo -r tip --template '{node}')
 path=$(nix eval --raw "(builtins.fetchMercurial file://$repo).outPath")
 [[ $(cat $path/hello) = world ]]
 
+# In pure eval mode, fetchGit without a revision should fail.
+[[ $(nix eval --raw "(builtins.readFile (fetchMercurial file://$repo + \"/hello\"))") = world ]]
+(! nix eval --pure-eval --raw "(builtins.readFile (fetchMercurial file://$repo + \"/hello\"))")
+
 # Fetch using an explicit revision hash.
 path2=$(nix eval --raw "(builtins.fetchMercurial { url = file://$repo; rev = \"$rev2\"; }).outPath")
 [[ $path = $path2 ]]
 
+# In pure eval mode, fetchGit with a revision should succeed.
+[[ $(nix eval --pure-eval --raw "(builtins.readFile (fetchMercurial { url = file://$repo; rev = \"$rev2\"; } + \"/hello\"))") = world ]]
+
 # Fetch again. This should be cached.
 mv $repo ${repo}-tmp
 path2=$(nix eval --raw "(builtins.fetchMercurial file://$repo).outPath")
diff --git a/tests/local.mk b/tests/local.mk
index 83154228e99..82502a8e5f0 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -20,7 +20,8 @@ nix_tests = \
   fetchMercurial.sh \
   signing.sh \
   run.sh \
-  brotli.sh
+  brotli.sh \
+  pure-eval.sh
   # parallel.sh
 
 install-tests += $(foreach x, $(nix_tests), tests/$(x))
diff --git a/tests/pure-eval.nix b/tests/pure-eval.nix
new file mode 100644
index 00000000000..ed25b3d4563
--- /dev/null
+++ b/tests/pure-eval.nix
@@ -0,0 +1,3 @@
+{
+  x = 123;
+}
diff --git a/tests/pure-eval.sh b/tests/pure-eval.sh
new file mode 100644
index 00000000000..49c8564487c
--- /dev/null
+++ b/tests/pure-eval.sh
@@ -0,0 +1,18 @@
+source common.sh
+
+clearStore
+
+nix eval --pure-eval '(assert 1 + 2 == 3; true)'
+
+[[ $(nix eval '(builtins.readFile ./pure-eval.sh)') =~ clearStore ]]
+
+(! nix eval --pure-eval '(builtins.readFile ./pure-eval.sh)')
+
+(! nix eval --pure-eval '(builtins.currentTime)')
+(! nix eval --pure-eval '(builtins.currentSystem)')
+
+(! nix-instantiate --pure-eval ./simple.nix)
+
+[[ $(nix eval "((import (builtins.fetchurl { url = file://$(pwd)/pure-eval.nix; })).x)") == 123 ]]
+(! nix eval --pure-eval "((import (builtins.fetchurl { url = file://$(pwd)/pure-eval.nix; })).x)")
+nix eval --pure-eval "((import (builtins.fetchurl { url = file://$(pwd)/pure-eval.nix; sha256 = \"$(nix hash-file pure-eval.nix --type sha256)\"; })).x)"
diff --git a/tests/restricted.nix b/tests/restricted.nix
new file mode 100644
index 00000000000..e0ef5840209
--- /dev/null
+++ b/tests/restricted.nix
@@ -0,0 +1 @@
+1 + 2
diff --git a/tests/restricted.sh b/tests/restricted.sh
index c063c8693d5..6c0392facf3 100644
--- a/tests/restricted.sh
+++ b/tests/restricted.sh
@@ -3,7 +3,8 @@ source common.sh
 clearStore
 
 nix-instantiate --restrict-eval --eval -E '1 + 2'
-(! nix-instantiate --restrict-eval ./simple.nix)
+(! nix-instantiate --restrict-eval ./restricted.nix)
+(! nix-instantiate --eval --restrict-eval <(echo '1 + 2'))
 nix-instantiate --restrict-eval ./simple.nix -I src=.
 nix-instantiate --restrict-eval ./simple.nix -I src1=simple.nix -I src2=config.nix -I src3=./simple.builder.sh
 
@@ -28,3 +29,10 @@ nix eval --raw "(builtins.fetchurl file://$(pwd)/restricted.sh)" --restrict-eval
 (! nix eval --raw "(builtins.fetchurl https://github.com/NixOS/patchelf/archive/master.tar.gz)" --restrict-eval)
 (! nix eval --raw "(builtins.fetchTarball https://github.com/NixOS/patchelf/archive/master.tar.gz)" --restrict-eval)
 (! nix eval --raw "(fetchGit git://github.com/NixOS/patchelf.git)" --restrict-eval)
+
+ln -sfn $(pwd)/restricted.nix $TEST_ROOT/restricted.nix
+[[ $(nix-instantiate --eval $TEST_ROOT/restricted.nix) == 3 ]]
+(! nix-instantiate --eval --restrict-eval $TEST_ROOT/restricted.nix)
+(! nix-instantiate --eval --restrict-eval $TEST_ROOT/restricted.nix -I $TEST_ROOT)
+(! nix-instantiate --eval --restrict-eval $TEST_ROOT/restricted.nix -I .)
+nix-instantiate --eval --restrict-eval $TEST_ROOT/restricted.nix -I $TEST_ROOT -I .