nix-copy-closure copies a Nix store path along with all
its dependencies to or from another machine via the SSH protocol. It
doesn’t copy store paths that are already present on the target machine.
For example, the following command copies Firefox with all its
$ nix-copy-closure --to email@example.com $(type -p firefox)
See the manpage for
nix-copy-closure for details.
nix-store --export and
nix-store --import you can write the closure of a store
path (that is, the path and all its dependencies) to a file, and then
unpack that file into another Nix store. For example,
$ nix-store --export $(nix-store -qR $(type -p firefox)) > firefox.closure
writes the closure of Firefox to a file. You can then copy this file to another machine and install the closure:
$ nix-store --import < firefox.closure
Any store paths in the closure that are already present in the target store are ignored. It is also possible to pipe the export into another command, e.g. to copy and install a closure directly to/on another machine:
$ nix-store --export $(nix-store -qR $(type -p firefox)) | bzip2 | \ ssh firstname.lastname@example.org "bunzip2 | nix-store --import"
nix-copy-closure is generally more efficient because it only
copies paths that are not already present in the target Nix store.