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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
parent e3013543d3
commit 0af668426d
1 changed files with 12 additions and 1 deletions
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13
doc/manual/command-ref/nix-hash.xml
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@ -44,7 +44,9 @@
cryptographic hash of the contents of each
<replaceable>path</replaceable> and prints it on standard output. By
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>
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>
<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:
<screen>