Add options to override default substituters and trusted-public-keys #603
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This commit introduces a way to override the default substituters and trusted-public-keys copied from the reference machine. A common use case is when the reference machine points to a local "proxy" binary cache (e.g., 127.0.0.1), which will not work on the target host. Using `--no-use-machine-substituters` disables the feature altogether, while `--option substituters <list>` and `--option extra-substituters <list>` results in errors due to the user not being part of trusted-users. This commit also changes how `~/.config/nix/nix.conf` is created: it now stores a backup (with a `.orig` suffix) before patching the file, and reuses that backup on future invocations. This avoids the situation where multiple runs of `nixos-anywhere` repeatedly append the same configuration over and over.
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This commit introduces a way to override the default substituters and trusted-public-keys copied from the reference machine.
A common use case is when the reference machine points to a local "proxy" binary cache (e.g., 127.0.0.1), which will not work on the target host.
Using
--no-use-machine-substitutersdisables the feature altogether, while--option substituters <list>and--option extra-substituters <list>results in errors due to the user not being part of trusted-users.This commit also changes how
~/.config/nix/nix.confis created: it now stores a backup (with a.origsuffix) before patching the file, and reuses that backup on future invocations.This avoids the situation where multiple runs of
nixos-anywhererepeatedly append the same configuration over and over.