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-rw-r--r--pkgs/build-support/vm/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index a9f9f0d184cf..53a013654357 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -187,6 +187,7 @@ rec {
     # then don't start the build again, but instead drop the user into
     # an interactive shell.
     if test -n "$origBuilder" -a ! -e /.debug; then
+      exec < /dev/null
       ${coreutils}/bin/touch /.debug
       $origBuilder $origArgs
       echo $? > /tmp/xchg/in-vm-exit