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Document fetchTarball can take a sha256 #1382

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May 24, 2017
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Document fetchTarball can take a sha256 #1382

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18 changes: 18 additions & 0 deletions doc/manual/expressions/builtins.xml
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Expand Up @@ -292,6 +292,24 @@ with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixo
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 { … }
</programlisting>

</para>

<para>This function is not available if <link
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