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docs: Add section on untrusted substituters in Nix

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Signed-off-by: David Mak <david.18.19.21@gmail.com>
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David Mak 2023-09-14 11:32:33 +08:00 committed by Sébastien Bourdeauducq
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commit 460cbf4499
1 changed files with 35 additions and 0 deletions
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doc/manual/installing.rst
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@ -87,6 +87,41 @@ You can create directories containing each a ``flake.nix`` that correspond to di
If your favorite package is not available with Nix, contact us using the helpdesk@ email.
Troubleshooting
^^^^^^^^^^^^^^^
"Ignoring untrusted substituter, you are not a trusted user"
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
If the following message displays when running ``nix shell`` or ``nix develop``
::
warning: ignoring untrusted substituter 'https://nixbld.m-labs.hk', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
and Nix proceeds to build some packages from source, this means that you are using `multi-user mode <https://nixos.org/manual/nix/stable/installation/multi-user>`_ in Nix, for example when Nix is installed via ``pacman`` in Arch Linux.
By default, users accessing Nix in multi-user mode are "unprivileged" and cannot use untrusted substituters. To change this, edit ``/etc/nix/nix.conf`` and add the following line (or append to the key if the key already exists):
::
trusted-substituters = https://nixbld.m-labs.hk
This will add the substituter as a trusted substituter for all users using Nix.
Alternatively, add the following line:
::
trusted-users = <username> # Replace <username> with the user invoking `nix`
This will set your user as a trusted user, allowing the use of any untrusted substituters.
.. warning::
Setting users as trusted users will effectively grant root access to those users. See the `Nix documentation <https://nixos.org/manual/nix/stable/command-ref/conf-file#conf-trusted-users>`_ for more information.
Installing via MSYS2 (Windows)
------------------------------