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nix-super/doc/manual/src/command-ref/nix-copy-closure.md

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# Name
`nix-copy-closure` - copy a closure to or from a remote machine via SSH
# Synopsis
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`nix-copy-closure`
[`--to` | `--from`]
[`--gzip`]
[`--include-outputs`]
[`--use-substitutes` | `-s`]
[`-v`]
_user@machine_ _paths_
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# Description
`nix-copy-closure` gives you an easy and efficient way to exchange
software between machines. Given one or more Nix store _paths_ on the
local machine, `nix-copy-closure` computes the closure of those paths
(i.e. all their dependencies in the Nix store), and copies all paths
in the closure to the remote machine via the `ssh` (Secure Shell)
command. With the `--from` option, the direction is reversed: the
closure of _paths_ on a remote machine is copied to the Nix store on
the local machine.
This command is efficient because it only sends the store paths
that are missing on the target machine.
Since `nix-copy-closure` calls `ssh`, you may be asked to type in the
appropriate password or passphrase. In fact, you may be asked _twice_
because `nix-copy-closure` currently connects twice to the remote
machine, first to get the set of paths missing on the target machine,
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and second to send the dump of those paths. When using public key
authentication, you can avoid typing the passphrase with `ssh-agent`.
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# Options
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- `--to`\
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Copy the closure of _paths_ from the local Nix store to the Nix
store on _machine_. This is the default.
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Replace the trailing markdown spaces by a backslash They are equivalent according to <https://spec.commonmark.org/0.29/#hard-line-breaks>, and the trailing spaces tend to be a pain (because the make git complain, editors tend to want to remove them − the `.editorconfig` actually specifies that − etc..).
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- `--from`\
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Copy the closure of _paths_ from the Nix store on _machine_ to the
local Nix store.
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Replace the trailing markdown spaces by a backslash They are equivalent according to <https://spec.commonmark.org/0.29/#hard-line-breaks>, and the trailing spaces tend to be a pain (because the make git complain, editors tend to want to remove them − the `.editorconfig` actually specifies that − etc..).
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- `--gzip`\
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Enable compression of the SSH connection.
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Replace the trailing markdown spaces by a backslash They are equivalent according to <https://spec.commonmark.org/0.29/#hard-line-breaks>, and the trailing spaces tend to be a pain (because the make git complain, editors tend to want to remove them − the `.editorconfig` actually specifies that − etc..).
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- `--include-outputs`\
link "store derivation" to glossary definition
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Also copy the outputs of [store derivation]s included in the closure.
doc/manual: Fix broken internal links The targets I could find.
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[store derivation]: ../glossary.md#gloss-store-derivation
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Replace the trailing markdown spaces by a backslash They are equivalent according to <https://spec.commonmark.org/0.29/#hard-line-breaks>, and the trailing spaces tend to be a pain (because the make git complain, editors tend to want to remove them − the `.editorconfig` actually specifies that − etc..).
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- `--use-substitutes` / `-s`\
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Attempt to download missing paths on the target machine using Nix’s
substitute mechanism. Any paths that cannot be substituted on the
target are still copied normally from the source. This is useful,
for instance, if the connection between the source and target
machine is slow, but the connection between the target machine and
`nixos.org` (the default binary cache server) is
fast.
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Replace the trailing markdown spaces by a backslash They are equivalent according to <https://spec.commonmark.org/0.29/#hard-line-breaks>, and the trailing spaces tend to be a pain (because the make git complain, editors tend to want to remove them − the `.editorconfig` actually specifies that − etc..).
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- `-v`\
Fix nix-copy-closure manpage
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Show verbose output.
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Split nix-env and nix-store documentation per-subcommand Documentation on "classic" commands with many sub-commands are notoriously hard to discover due to lack of overview and anchor links. Additionally the information on common options and environment variables is not accessible offline in man pages, and therefore often overlooked by readers. With this change, each sub-command of nix-store and nix-env gets its own page in the manual (listed in the table of contents), and each own man page. Also, man pages for each subcommand now (again) list common options and environment variables. While this makes each page quite long and some common parameters don't apply, this should still make it easier to navigate as that additional information was not accessible on the command line at all. It is now possible to run 'nix-store --<subcommand> --help` to display help pages for the given subcommand. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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{{#include ./opt-common.md}}
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# Environment variables
Replace the trailing markdown spaces by a backslash They are equivalent according to <https://spec.commonmark.org/0.29/#hard-line-breaks>, and the trailing spaces tend to be a pain (because the make git complain, editors tend to want to remove them − the `.editorconfig` actually specifies that − etc..).
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- `NIX_SSHOPTS`\
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Additional options to be passed to `ssh` on the command
line.
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Split nix-env and nix-store documentation per-subcommand Documentation on "classic" commands with many sub-commands are notoriously hard to discover due to lack of overview and anchor links. Additionally the information on common options and environment variables is not accessible offline in man pages, and therefore often overlooked by readers. With this change, each sub-command of nix-store and nix-env gets its own page in the manual (listed in the table of contents), and each own man page. Also, man pages for each subcommand now (again) list common options and environment variables. While this makes each page quite long and some common parameters don't apply, this should still make it easier to navigate as that additional information was not accessible on the command line at all. It is now possible to run 'nix-store --<subcommand> --help` to display help pages for the given subcommand. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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{{#include ./env-common.md}}
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# Examples
Copy Firefox with all its dependencies to a remote machine:
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```console
$ nix-copy-closure --to alice@itchy.labs $(type -tP firefox)
```
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Copy Subversion from a remote machine and then install it into a user
environment:
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```console
$ nix-copy-closure --from alice@itchy.labs \
/nix/store/0dj0503hjxy5mbwlafv1rsbdiyx1gkdy-subversion-1.4.4
Convert short nix options to long ones e.g. nix-env -e subversion => nix-env --uninstall subversion The aim is to make the documentation less cryptic for newcomers and the long options are more self-documenting. The change was made with the following script: <https://github.com/aschmolck/convert-short-nix-opts-to-long-ones> and sanity checked visually.
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$ nix-env --install /nix/store/0dj0503hjxy5mbwlafv1rsbdiyx1gkdy-subversion-1.4.4
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```
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