Merge pull request #1382 from FRidh/patch-1
Document fetchTarball can take a sha256
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@ -298,6 +298,24 @@ with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixo
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stdenv.mkDerivation { … }
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</programlisting>
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Note that when obtaining the hash with <varname>nix-prefetch-url
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</varname> the option <varname>--unpack</varname> is required.
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</para>
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<para>This function can also verify the contents against a hash.
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In that case, the function takes a set instead of a URL. The set
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requires the attribute <varname>url</varname> and the attribute
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<varname>sha256</varname>, e.g.
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<programlisting>
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with import (fetchTarball {
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url = https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz;
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sha256 = "1jppksrfvbk5ypiqdz4cddxdl8z6zyzdb2srq8fcffr327ld5jj2";
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}) {};
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stdenv.mkDerivation { … }
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</programlisting>
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</para>
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<para>This function is not available if <link
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