eb7d7780b1
This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
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Serving a Nix store via SSH
You can tell Nix to automatically fetch needed binaries from a remote
Nix store via SSH. For example, the following installs Firefox,
automatically fetching any store paths in Firefox’s closure if they are
available on the server avalon:
$ nix-env --install --attr nixpkgs.firefox --substituters ssh://alice@avalon
This works similar to the binary cache substituter that Nix usually
uses, only using SSH instead of HTTP: if a store path P is needed, Nix
will first check if it’s available in the Nix store on avalon. If not,
it will fall back to using the binary cache substituter, and then to
building from source.
Note
The SSH substituter currently does not allow you to enter an SSH passphrase interactively. Therefore, you should use
ssh-addto load the decrypted private key intossh-agent.
You can also copy the closure of some store path, without installing it into your profile, e.g.
$ nix-store --realise /nix/store/m85bxg…-firefox-34.0.5 --substituters
ssh://alice@avalon
This is essentially equivalent to doing
$ nix-copy-closure --from alice@avalon
/nix/store/m85bxg…-firefox-34.0.5
You can use SSH’s forced command feature to set up a restricted user
account for SSH substituter access, allowing read-only access to the
local Nix store, but nothing more. For example, add the following lines
to sshd_config to restrict the user nix-ssh:
Match User nix-ssh
AllowAgentForwarding no
AllowTcpForwarding no
PermitTTY no
PermitTunnel no
X11Forwarding no
ForceCommand nix-store --serve
Match All
On NixOS, you can accomplish the same by adding the following to your
configuration.nix:
nix.sshServe.enable = true;
nix.sshServe.keys = [ "ssh-dss AAAAB3NzaC1k... bob@example.org" ];
where the latter line lists the public keys of users that are allowed to connect.