Add support for the build-timeout' and --timeout' options.

tests/Makefile.am

@@ -8,7 +8,7 @@ TESTS = init.sh hash.sh lang.sh add.sh simple.sh dependencies.sh \
   referrers.sh user-envs.sh logging.sh nix-build.sh misc.sh fixed.sh \
   gc-runtime.sh install-package.sh check-refs.sh filter-source.sh \
   remote-store.sh export.sh export-graph.sh negative-caching.sh \
-  binary-patching.sh
+  binary-patching.sh timeout.sh
 
 XFAIL_TESTS =
 
@@ -33,5 +33,6 @@ EXTRA_DIST = $(TESTS) \
   export-graph.nix \
   negative-caching.nix \
   binary-patching.nix \
+  timeout.nix timeout.builder.sh \
   $(wildcard lang/*.nix) $(wildcard lang/*.exp) $(wildcard lang/*.exp.xml) $(wildcard lang/*.flags) \
   common.sh.in

tests/timeout.builder.sh

@@ -0,0 +1,2 @@
+echo "\`timeout' builder entering an infinite loop"
+while true ; do : ; done

tests/timeout.nix

@@ -0,0 +1,8 @@
+with import ./config.nix;
+
+mkDerivation {
+  name = "timeout";
+  builder = ./timeout.builder.sh;
+  PATH = "";
+  goodPath = path;
+}

tests/timeout.sh

@@ -0,0 +1,24 @@
+# Test the `--timeout' option.
+
+source common.sh
+
+drvPath=$($nixinstantiate timeout.nix)
+
+test "$($nixstore -q --binding system "$drvPath")" = "$system"
+
+echo "derivation is $drvPath"
+
+failed=0
+messages="`$nixstore -r --timeout 2 $drvPath 2>&1 || failed=1`"
+if test $failed -ne 0; then
+    echo "error: \`nix-store' succeeded; should have timed out" >&2
+    exit 1
+fi
+
+if ! echo "$messages" | grep "timed out"; then
+    echo "error: \`nix-store' may have failed for reasons other than timeout" >&2
+    echo >&2
+    echo "output of \`nix-store' follows:" >&2
+    echo "$messages" >&2
+    exit 1
+fi