nix-build: check that envCommand exists #1
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When starting a nix-shell with `-i` it was previously possible for it to silently fail in the scenario where the specified interpreter didn't exist. This happened due to the `exec` call masking the issue. With this change we enable `execfail`, which causes the script using `nix-shell` as interpreter to correctly exit with code 127. Fixes: NixOS#4598
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Fixes NixOS#4598