1 files changed, 33 insertions, 0 deletions
diff --git a/tests/supplementary-groups.sh b/tests/supplementary-groups.sh
new file mode 100644
index 000000000..fd3da2945
--- /dev/null
+++ b/tests/supplementary-groups.sh
@@ -0,0 +1,33 @@
+source common.sh
+
+requireSandboxSupport
+[[ $busybox =~ busybox ]] || skipTest "no busybox"
+if ! command -p -v unshare; then skipTest "Need unshare"; fi
+needLocalStore "The test uses --store always so we would just be bypassing the daemon"
+
+unshare --mount --map-root-user bash <<EOF
+  source common.sh
+
+  setLocalStore () {
+    export NIX_REMOTE=\$TEST_ROOT/\$1
+    mkdir -p \$NIX_REMOTE
+  }
+
+  cmd=(nix-build ./hermetic.nix --arg busybox "$busybox" --arg seed 1)
+
+  # Fails with default setting
+  # TODO better error
+  setLocalStore store1
+  expectStderr 1 "\${cmd[@]}" | grepQuiet "unable to start build process"
+
+  # Fails with `drop-supplementary-groups`
+  # TODO better error
+  setLocalStore store2
+  NIX_CONFIG='drop-supplementary-groups = true' \
+    expectStderr 1 "\${cmd[@]}" | grepQuiet "unable to start build process"
+
+  # Works without `drop-supplementary-groups`
+  setLocalStore store3
+  NIX_CONFIG='drop-supplementary-groups = false' \
+    "\${cmd[@]}"
+EOF