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fix: avoid channel evaluation during prebuilt activation

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Use the rebuild binary from the reviewed closure and --no-reexec. The bootstrap nixos-rebuild otherwise evaluates its own package through the old channel before honoring --store-path. The failed attempt made no live changes.
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Coding Agent
2026-09-04 23:16:21 +00:00
parent a2843c982f
commit a6cd721bf0
1 changed files with 5 additions and 2 deletions
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README.md
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@@ -39,10 +39,13 @@ New source files must be added to Git for flakes to see them. Keep `flake.lock`
Review and activate exactly the built closure:
```sh
sudo nixos-rebuild dry-activate --store-path "$(readlink -f result)"
sudo nixos-rebuild switch --store-path "$(readlink -f result)"
built=$(readlink -f result)
sudo "$built/sw/bin/nixos-rebuild" dry-activate --no-reexec --store-path "$built"
sudo "$built/sw/bin/nixos-rebuild" switch --no-reexec --store-path "$built"
```
Use the rebuild tool from that closure with `--no-reexec`: otherwise the bootstrap tool can try to rebuild itself through the old channel even when `--store-path` is supplied. Capturing `built` also keeps review and activation on the same immutable result.
For initial deployment on a compatible NixOS EC2 base where flakes are not enabled yet, check out this repo and run the build as an existing administrator with the temporary CLI flag:
```sh