116 lines
4.3 KiB
XML
116 lines
4.3 KiB
XML
<refentry>
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<refnamediv>
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<refname>nix-push</refname>
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<refpurpose>push store paths onto a network cache</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-push</command>
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<group choice='req'>
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<arg choice='req'>
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<arg choice='plain'><replaceable>archives-put-url</replaceable></arg>
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<arg choice='plain'><replaceable>archives-get-url</replaceable></arg>
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<arg choice='plain'><replaceable>manifest-put-url</replaceable></arg>
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</arg>
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<arg choice='req'>
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<arg choice='plain'><option>--copy</option></arg>
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<arg choice='plain'><replaceable>archives-dir</replaceable></arg>
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<arg choice='plain'><replaceable>manifest-file</replaceable></arg>
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</arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>The command <command>nix-push</command> builds a set of store
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paths (if necessary), and then packages and uploads all store paths in
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the resulting closures to a server. A network cache thus populated
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can subsequently be used to speed up software deployment on other
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machines using the <command>nix-pull</command> command.</para>
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<para><command>nix-push</command> performs the following actions.
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<orderedlist>
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<listitem><para>Each path in <replaceable>paths</replaceable> is
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realised (using <link
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linkend='rsec-nix-store-realise'><literal>nix-store
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--realise</literal></link>).</para></listitem>
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<listitem><para>All paths in the closure of the store expressions
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stored in <replaceable>paths</replaceable> are determined (using
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<literal>nix-store --query --requisites
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--include-outputs</literal>). It should be noted that since the
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<option>--include-outputs</option> flag is used, you get a combined
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source/binary distribution.</para></listitem>
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<listitem><para>All store paths determined in the previous step are
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packaged and compressed into a <command>bzip</command>ped NAR
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archive (extension <filename>.nar.bz2</filename>).</para></listitem>
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<listitem><para>A <emphasis>manifest</emphasis> is created that
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contains information on the store paths, their eventual URLs in the
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cache, and cryptographic hashes of the contents of the NAR
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archives.</para></listitem>
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<listitem><para>Each store path is uploaded to the remote directory
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specified by <replaceable>archives-put-url</replaceable>. HTTP PUT
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requests are used to do this. However, before a file
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<varname>x</varname> is uploaded to
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<literal><replaceable>archives-put-url</replaceable>/<varname>x</varname></literal>,
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<command>nix-push</command> first determines whether this upload is
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unnecessary by issuing a HTTP HEAD request on
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<literal><replaceable>archives-get-url</replaceable>/<varname>x</varname></literal>.
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This allows a cache to be shared between many partially overlapping
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<command>nix-push</command> invocations. (We use two URLs because
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the upload URL typically refers to a CGI script, while the download
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URL just refers to a file system directory on the server.)</para></listitem>
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<listitem><para>The manifest is uploaded using an HTTP PUT request
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to <replaceable>manifest-put-url</replaceable>. The corresponding
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URL to download the manifest can then be used by
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<command>nix-pull</command>.</para></listitem>
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</orderedlist>
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</para>
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<para>TODO: <option>--copy</option></para>
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</refsection>
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<refsection><title>Examples</title>
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<para>To upload files there typically is some CGI script on the server
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side. This script should be be protected with a password. The
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following example uploads the store paths resulting from building the
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Nix expressions in <filename>foo.nix</filename>, passing appropriate
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authentication information:
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<screen>
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$ nix-push \
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http://foo@bar:server.domain/cgi-bin/upload.pl/cache \
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http://server.domain/cache \
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http://foo@bar:server.domain/cgi-bin/upload.pl/MANIFEST \
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$(nix-instantiate foo.nix)</screen>
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This will push both sources and binaries (and any build-time
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dependencies used in the build, such as compilers).</para>
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<para>If we just want to push binaries, not sources and build-time
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dependencies, we can do:
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<screen>
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$ nix-push <replaceable>urls</replaceable> $(nix-instantiate $(nix-store -r foo.nix))</screen>
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</para>
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</refsection>
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</refentry>
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