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Document fetchTarball can take a sha256

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Note that I refer to `nix-prefetch-url`.
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Frederik Rietdijk 2017-05-11 13:38:13 +02:00 committed by GitHub
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commit 2b2de5ef6a
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18
doc/manual/expressions/builtins.xml
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@ -289,6 +289,24 @@ Evaluates to <literal>[ "b" "c" ]</literal>.
<programlisting> <programlisting>
with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {}; with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {};
stdenv.mkDerivation { … }
</programlisting>
Note that when obtaining the hash with <varname>nix-prefetch-url
</varname> the option <varname>--unpack</varname> is required.
</para>
<para>This function can also verify the contents against a hash.
In that case, the function takes a set instead of a URL. The set
requires the attribute <varname>url</varname> and the attribute
<varname>sha256</varname>, e.g.
<programlisting>
with import (fetchTarball {
url = https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz;
sha256 = "1jppksrfvbk5ypiqdz4cddxdl8z6zyzdb2srq8fcffr327ld5jj2";
}) {};
stdenv.mkDerivation { … } stdenv.mkDerivation { … }
</programlisting> </programlisting>