nix-shell: Respect --dry-run

Fixes #824.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
index 42d68fdfd..dc80dd6a5 100755
--- a/src/nix-build/nix-build.cc
+++ b/src/nix-build/nix-build.cc
@@ -390,6 +390,8 @@ int main(int argc, char ** argv)
                     maybePrintExecError(e);
                 }
 
+                if (dryRun) return;
+
                 // Set the environment.
                 auto env = getEnv();