2020-07-23 08:10:59 -04:00
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# Copying Closures via SSH
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2020-07-22 17:17:48 -04:00
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The command `nix-copy-closure` copies a Nix store path along with all
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its dependencies to or from another machine via the SSH protocol. It
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doesn’t copy store paths that are already present on the target machine.
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For example, the following command copies Firefox with all its
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dependencies:
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$ nix-copy-closure --to alice@itchy.example.org $(type -p firefox)
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2020-07-24 08:31:33 -04:00
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See the [manpage for `nix-copy-closure`](../command-ref/nix-copy-closure.md) for details.
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2020-07-22 17:17:48 -04:00
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With `nix-store
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--export` and `nix-store --import` you can write the closure of a store
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path (that is, the path and all its dependencies) to a file, and then
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unpack that file into another Nix store. For example,
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$ nix-store --export $(nix-store -qR $(type -p firefox)) > firefox.closure
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writes the closure of Firefox to a file. You can then copy this file to
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another machine and install the closure:
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$ nix-store --import < firefox.closure
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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 another
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command, e.g. to copy and install a closure directly to/on another
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machine:
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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"
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However, `nix-copy-closure` is generally more efficient because it only
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copies paths that are not already present in the target Nix store.
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