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Merge pull request #207 from cachix/always-allow-substitutes
Enable `always-allow-substitutes` by default
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commit
262815eb71
2 changed files with 31 additions and 1 deletions
27
README.md
27
README.md
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@ -18,7 +18,7 @@ or [pin nixpkgs yourself](https://nix.dev/reference/pinning-nixpkgs)
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- Allows specifying extra Nix configuration options via `extra_nix_config`
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- Allows specifying extra Nix configuration options via `extra_nix_config`
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- Allows specifying `$NIX_PATH` and channels via `nix_path`
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- Allows specifying `$NIX_PATH` and channels via `nix_path`
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- Share `/nix/store` between builds using [cachix-action](https://github.com/cachix/cachix-action) for simple binary cache setup to speed up your builds and share binaries with your team
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- Share `/nix/store` between builds using [cachix-action](https://github.com/cachix/cachix-action) for simple binary cache setup to speed up your builds and share binaries with your team
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- Enables `flakes` and `nix-command` experimental features by default (to disable, set `experimental-features` via `extra_nix_config`)
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- Enables KVM on supported machines: run VMs and NixOS tests with full hardware-acceleration
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## Usage
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## Usage
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@ -75,6 +75,31 @@ To install Nix from any commit, go to [the corresponding installer_test action](
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- `enable_kvm`: whether to enable KVM for hardware-accelerated virtualization on Linux. Enabled by default if available.
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- `enable_kvm`: whether to enable KVM for hardware-accelerated virtualization on Linux. Enabled by default if available.
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## Differences from the default Nix installer
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Some settings have been optimised for use in CI environments:
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- `nix.conf` settings. Override these defaults with `extra_nix_config`:
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- The experimental `flakes` and `nix-command` features are enabled. Disable by overriding `experimental-features` in `extra_nix_config`.
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- `max-jobs` is set to `auto`.
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- `show-trace` is set to `true`.
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- `$USER` is added to `trusted-users`.
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- `$GITHUB_TOKEN` is added to `access_tokens` if no other `github_access_token` is provided.
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- `always-allow-substitutes` is set to `true`.
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- `ssl-cert-file` is set to `/etc/ssl/cert.pem` on macOS.
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- KVM is enabled on Linux if available. Disable by setting `enable_kvm: false`.
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- `$TMPDIR` is set to `$RUNNER_TEMP` if empty.
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---
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---
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## FAQ
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## FAQ
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@ -56,6 +56,11 @@ fi
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if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "experimental-features" ]]; then
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if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "experimental-features" ]]; then
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add_config "experimental-features = nix-command flakes"
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add_config "experimental-features = nix-command flakes"
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fi
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fi
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# Always allow substituting from the cache, even if the derivation has `allowSubstitutes = false`.
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# This is a CI optimisation to avoid having to download the inputs for already-cached derivations to rebuild trivial text files.
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if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "always-allow-substitutes" ]]; then
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add_config "always-allow-substitutes = true"
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fi
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# Nix installer flags
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# Nix installer flags
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installer_options=(
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installer_options=(
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