2014-08-27 18:41:09 +02:00
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="sec-sharing-packages">
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<title>Sharing Packages Between Machines</title>
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<para>Sometimes you want to copy a package from one machine to
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another. Or, you want to install some packages and you know that
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another machine already has some or all of those packages or their
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dependencies. In that case there are mechanisms to quickly copy
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packages between machines.</para>
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<para>The command <command
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linkend="sec-nix-copy-closure">nix-copy-closure</command> copies a Nix
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store path along with all its dependencies to or from another machine
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via the SSH protocol. It doesn’t copy store paths that are already
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present on the target machine. For example, the following command
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copies Firefox with all its dependencies:
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<screen>
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$ nix-copy-closure --to alice@itchy.example.org $(type -p firefox)</screen>
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See <xref linkend='sec-nix-copy-closure' /> for details.</para>
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<para>With <command linkend='refsec-nix-store-export'>nix-store
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--export</command> and <command
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linkend='refsec-nix-store-import'>nix-store --import</command> you can
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write the closure of a store path (that is, the path and all its
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dependencies) to a file, and then unpack that file into another Nix
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store. For example,
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<screen>
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$ nix-store --export $(nix-store -qR $(type -p firefox)) > firefox.closure</screen>
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writes the closure of Firefox to a file. You can then copy this file
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to another machine and install the closure:
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<screen>
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$ nix-store --import < firefox.closure</screen>
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Any store paths in the closure that are already present in the target
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store are ignored. It is also possible to pipe the export into
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another command, e.g. to copy and install a closure directly to/on
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another machine:
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<screen>
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$ nix-store --export $(nix-store -qR $(type -p firefox)) | bzip2 | \
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ssh alice@itchy.example.org "bunzip2 | nix-store --import"</screen>
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But note that <command>nix-copy-closure</command> is generally more
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efficient in this example because it only copies paths that are not
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already present in the target Nix store.</para>
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2014-09-16 14:49:00 +02:00
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</chapter>
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