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-rw-r--r--src/nix-instantiate/nix-instantiate.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/nix-instantiate/nix-instantiate.cc b/src/nix-instantiate/nix-instantiate.cc
index 762b52ae1..afd16b3a5 100644
--- a/src/nix-instantiate/nix-instantiate.cc
+++ b/src/nix-instantiate/nix-instantiate.cc
@@ -139,6 +139,8 @@ void run(Strings args)
strict = true;
else if (arg == "--repair")
state.repair = true;
+ else if (arg == "--dry-run")
+ settings.readOnlyMode = true;
else if (arg[0] == '-')
throw UsageError(format("unknown flag `%1%'") % arg);
else