1 files changed, 41 insertions, 0 deletions
diff --git a/tests/functional/regression-484.sh b/tests/functional/regression-484.sh
new file mode 100644
index 000000000..1aa039ac2
--- /dev/null
+++ b/tests/functional/regression-484.sh
@@ -0,0 +1,41 @@
+source common.sh
+
+# Ensures that nix build will deliver a usable error message when it encounters
+# a build failure potentially caused by allowSubstitutes.
+
+clearStore
+
+cd $TEST_HOME
+
+putDrv() {
+    cat > "$1" <<EOF
+builtins.derivation {
+  name = "meow";
+  builder = "/bin/sh";
+  args = [];
+  system = "unicornsandrainbows-linux";
+  allowSubstitutes = ${2};
+  preferLocalBuild = true;
+}
+EOF
+}
+
+putDrv drv-disallow-substitutes.nix false
+putDrv drv-allow-substitutes.nix true
+
+expect 1 nix build --substitute --substituters '' --offline -f drv-disallow-substitutes.nix 2> output.txt
+
+# error: a 'unicornsandrainbows-linux' with features {} is required to build '$TMPDIR/regression-484/store/...-meow.drv', but I am a 'x86_64-linux' with features {benchmark, big-parallel, kvm, nixos-test, uid-range}
+#
+#        Hint: the failing derivation has allowSubstitutes set to false, forcing it to be built rather than substituted.
+#        Passing --always-allow-substitutes to force substitution may resolve this failure if the path is available in a substituter.
+cat output.txt
+grepQuiet unicornsandrainbows-linux output.txt
+grepQuiet always-allow-substitutes output.txt
+grepQuiet allowSubstitutes output.txt
+
+expect 1 nix build --substitute --substituters '' --offline -f drv-allow-substitutes.nix 2> output.txt
+
+cat output.txt
+grepQuiet unicornsandrainbows-linux output.txt
+grepQuiet -v allowSubstitutes output.txt