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92e832348d
* nix-pull now requires the full url to the manifest, i.e., `/MANIFEST/' is no longer automatically appended. * nix-prefetch-url works again.
138 lines
4.9 KiB
XML
138 lines
4.9 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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<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 choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection>
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<title>Description</title>
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<para>
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The command <command>nix-push</command> builds a set of store
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expressions (if necessary), and then packages and uploads all
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store paths in the resulting closures to a server. A network
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cache thus populated can subsequently be used to speed up
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software deployment on other machines using the
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<command>nix-pull</command> command.
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</para>
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<para>
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<command>nix-push</command> performs the following actions.
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<orderedlist>
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<listitem>
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<para>
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The store expressions stored in
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<replaceable>paths</replaceable> are realised (using
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<literal>nix-store --realise</literal>).
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</para>
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</listitem>
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<listitem>
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<para>
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All paths in the closure of the store expressions stored
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in <replaceable>paths</replaceable> are determined (using
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<literal>nix-store --query --requisites
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--include-successors</literal>). It should be noted that
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since the <option>--include-successors</option> flag is
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used, if you specify a derivation store expression, you
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get a combined source/binary distribution. If you only
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want a binary distribution, you should specify the closure
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store expression that result from realising these (see
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below).
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</para>
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</listitem>
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<listitem>
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<para>
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All store paths determined in the previous step are
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packaged and compressed into a <command>bzip</command>ped
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NAR archive (extension <filename>.nar.bz2</filename>).
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</para>
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</listitem>
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<listitem>
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<para>
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A <emphasis>manifest</emphasis> is created that contains
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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.
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</para>
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</listitem>
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<listitem>
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<para>
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Each store path is uploaded to the remote directory
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specified by <replaceable>archives-put-url</replaceable>.
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HTTP PUT requests are used to do this. However, before a
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file <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
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upload is 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
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overlapping <command>nix-push</command> invocations.
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(We use two URLs because the upload URL typically
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refers to a CGI script, while the download URL just refers
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to a file system directory on the server.)
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</para>
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</listitem>
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<listitem>
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<para>
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The manifest is uploaded using an HTTP PUT request to
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<replaceable>manifest-put-url</replaceable>. The
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corresponding URL to download the manifest can then be
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used by <command>nix-pull</command>.
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</para>
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</listitem>
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</orderedlist>
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</para>
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</refsection>
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<refsection>
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<title>Examples</title>
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<para>
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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
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building the Nix expressions in <filename>foo.nix</filename>,
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passing appropriate 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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$(nix-instantiate foo.nix)</screen>
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This will push both sources and binaries (and any build-time
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dependencies used in the build, such as compilers).
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</para>
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<para>
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If we just want to push binaries, not sources and build-time
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dependencies, we can do:
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<screen>
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$ 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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