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chore: update the nix upgrade docs

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These have been outdated for a while, not only because we're now using
flake.nix, but also in various other places.

Resolves #4816
This commit is contained in:
Wolfgang Walther
2026-04-20 19:29:26 +00:00
parent 695678ad40
commit 3b1373ec02
1 changed files with 6 additions and 24 deletions
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nix/UPGRADE.md
+6 -24
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@@ -16,11 +16,8 @@ The following checklist guides you through the complete process in more detail.
## Upgrade the pinned version of `nixpkgs`
The pinned version of [`nixpkgs`](https://github.com/NixOS/nixpkgs) is defined
in [`nix/nixpkgs-version.nix`](nixpkgs-version.nix). The pin refers directly to
a GitHub tarball for the given revision, which is more efficient than pulling
the complete Git repository. To upgrade it to the current `main` of
`nixpkgs`, you can use a small utility script defined in
[`nix/nixpkgs-update.nix`](nixpkgs-update.nix):
in [`flake.nix`](../flake.nix). To upgrade it, you can use a small utility
script defined in [`nix/tools/nixpkgsTools.nix`](tools/nixpkgsTools.nix):
```bash
# From the root of the repository, enter nix-shell
@@ -30,21 +27,12 @@ nix-shell
postgrest-nixpkgs-upgrade
# Exit the nix-shell with Ctrl-d
```
## Review overlays
Check whether the individual [overlays](overlays) are still required.
## Check if patches are still required and update them as needed
We track a number of PostgREST-specific patches in [`nix/patches`](patches).
Check whether the pull-requests/issues linked in the
[`default.nix`](patches/default.nix) have progressed and remove/modify the
patches if they did. If conflicting changes occurred, you might have to rebase
the respective patches.
## Build everything
Using the PostgREST binary Nix cache is recommended. Install
@@ -58,25 +46,19 @@ errors, this is probably due to one of our patches. Try to fix them and re-run
## Update the PostgREST binary cache
If you have access to the PostgREST cachix signing key, you can push the
If you have access to the PostgREST cachix project, you can push the
artifacts that you built locally to the binary cache. This will accelerate the
CI builds and tests, sometimes dramatically. This might sometimes even be
required to avoid build timeouts in CI.
You'll need to set the `CACHIX_SIGNING_KEY` before proceeding, e.g. by creating
a file containing `export CACHIX_SIGNING_KEY=...` and sourcing that file, which
avoids having the secret in your shell history.
You'll need to login with your token with `cachix authtoken <token>`.
To push all new artifacts to Cachix, run:
```
nix-store -qR --include-outputs $$(nix-instantiate) | cachix push postgrest
# Or, equivalently
nix-shell --run postgrest-push-cachix
```
The `nix-store` command will query the nix-store to list all dependencies and
build artifacts of PostgREST. The `cachix` command will efficiently push
The `postgrest-push-cachix` command will query the nix-store to list all
dependencies and build artifacts of PostgREST. It will then push
everything that is not yet cached to the binary cache.