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-rw-r--r--src/nix/shell.cc3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/nix/shell.cc b/src/nix/shell.cc
index 93732f6a3..5f2724961 100644
--- a/src/nix/shell.cc
+++ b/src/nix/shell.cc
@@ -72,7 +72,7 @@ Path getDerivationEnvironment(ref<Store> store, Derivation drv)
if (builder != "bash")
throw Error("'nix shell' only works on derivations that use 'bash' as their builder");
- drv.args = {"-c", "set -e; if [[ -n $stdenv ]]; then source $stdenv/setup; fi; set > $out"};
+ drv.args = {"-c", "set -e; export IN_NIX_SHELL=impure; if [[ -n $stdenv ]]; then source $stdenv/setup; fi; set > $out"};
/* Remove derivation checks. */
drv.env.erase("allowedReferences");
@@ -143,7 +143,6 @@ struct Common : InstallableCommand, MixProfile
void makeRcScript(const BuildEnvironment & buildEnvironment, std::ostream & out)
{
- out << "export IN_NIX_SHELL=1\n";
out << "nix_saved_PATH=\"$PATH\"\n";
for (auto & i : buildEnvironment.env) {