forked from lix-project/lix
nix-shell --pure: Let it work for any derivation
`nix-shell --pure` when applied to a non stdenv derivation doesn't seem to clear the PATH. It expects the stdenv/setup file to do so. This adds an explicit `unset PATH` by nix-build.cc (nix-shell) itself so that it's not reliant on stdenv/setup anymore. This does not break impure nix-shell since the PATH is persisted as the variable `p` prior in the bash rcfile fixes #5092
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@ -489,6 +489,9 @@ static void main_nix_build(int argc, char * * argv)
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"_nix_shell_clean_tmpdir; ") +
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(pure ? "" : "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;") +
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"%2%"
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// always clear PATH.
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// when nix-shell is run impure, we rehydrate it with the `p=$PATH` above
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"unset PATH;"
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"dontAddDisableDepTrack=1;\n"
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+ structuredAttrsRC +
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"\n[ -e $stdenv/setup ] && source $stdenv/setup; "
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