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nix-hash: Add sentence and example for nix-prefetch-url hash

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Markus Hauck 2017-12-08 10:27:34 +01:00
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doc/manual/command-ref/nix-hash.xml
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@ -44,7 +44,9 @@
cryptographic hash of the contents of each cryptographic hash of the contents of each
<replaceable>path</replaceable> and prints it on standard output. By <replaceable>path</replaceable> and prints it on standard output. By
default, it computes an MD5 hash, but other hash algorithms are default, it computes an MD5 hash, but other hash algorithms are
available as well. The hash is printed in hexadecimal.</para> available as well. The hash is printed in hexadecimal. To generate
the same hash as <command>nix-prefetch-url</command> you have to
specify multiple arguments, see below for an example.</para>
<para>The hash is computed over a <emphasis>serialisation</emphasis> <para>The hash is computed over a <emphasis>serialisation</emphasis>
of each path: a dump of the file system tree rooted at the path. This of each path: a dump of the file system tree rooted at the path. This
@ -122,6 +124,15 @@ cryptographic hash as <literal>nix-store --dump
<refsection><title>Examples</title> <refsection><title>Examples</title>
<para>Computing the same hash as <command>nix-prefetch-url</command>:
<screen>
$ nix-prefetch-url file://<(echo test)
1lkgqb6fclns49861dwk9rzb6xnfkxbpws74mxnx01z9qyv1pjpj
$ nix-hash --type sha256 --flat --base32 <(echo test)
1lkgqb6fclns49861dwk9rzb6xnfkxbpws74mxnx01z9qyv1pjpj
</screen>
</para>
<para>Computing hashes: <para>Computing hashes:
<screen> <screen>