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-rwxr-xr-xsrc/nix-build/nix-build.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
index 8e56e5a46b19..21b0a18dd887 100755
--- a/src/nix-build/nix-build.cc
+++ b/src/nix-build/nix-build.cc
@@ -167,6 +167,9 @@ void mainWrapped(int argc, char * * argv)
             buildMode = bmRepair;
         }
 
+        else if (*arg == "--hash")
+            buildMode = bmHash;
+
         else if (*arg == "--run-env") // obsolete
             runEnv = true;