From d0f4bcdc2d5249368eaae452a43a7b668f6744fd Mon Sep 17 00:00:00 2001
From: Martin Fischer <martin@push-f.com>
Date: Sat, 10 Oct 2026 07:46:57 +0200
Subject: refactor: merge channel config to channels.toml

---
 nixos/README.md                 | 4 ++--
 nixos/channels.toml             | 6 ++++++
 nixos/hosts/ev/metadata.toml    | 1 -
 nixos/hosts/hamac/metadata.toml | 1 -
 nixos/hosts/tente/metadata.toml | 1 -
 nixos/rebuild                   | 4 ++--
 6 files changed, 10 insertions(+), 7 deletions(-)
 create mode 100644 nixos/channels.toml
 delete mode 100644 nixos/hosts/ev/metadata.toml
 delete mode 100644 nixos/hosts/hamac/metadata.toml
 delete mode 100644 nixos/hosts/tente/metadata.toml

diff --git a/nixos/README.md b/nixos/README.md
index 075f812..b65f510 100644
--- a/nixos/README.md
+++ b/nixos/README.md
@@ -32,8 +32,8 @@ We're assuming that you just installed NixOS by going through the [official inst
      nixos-generate-config --dir .
      ```
 3. Rename the `configuration.nix` to `default.nix`.
-   Create a `metadata.toml` file with a `channel` field
-   where the value is the key of a channel pinned in `npins/sources.json`.
+   Add the host to `channels.toml`, mapping the hostname to the key of a channel pinned in `npins/sources.json`.
+
    A new channel can be pinned with:
 
    ```
diff --git a/nixos/channels.toml b/nixos/channels.toml
new file mode 100644
index 0000000..577063c
--- /dev/null
+++ b/nixos/channels.toml
@@ -0,0 +1,6 @@
+# Maps hostnames to Nixpkgs channels pinned in npins/sources.json.
+# The channel determines the Nixpkgs source, whose evaluation is passed as pkgs.
+
+ev = "nixos-small"
+hamac = "nixos"
+tente = "nixos-small"
diff --git a/nixos/hosts/ev/metadata.toml b/nixos/hosts/ev/metadata.toml
deleted file mode 100644
index 58f0301..0000000
--- a/nixos/hosts/ev/metadata.toml
+++ /dev/null
@@ -1 +0,0 @@
-channel = "nixos-small"
diff --git a/nixos/hosts/hamac/metadata.toml b/nixos/hosts/hamac/metadata.toml
deleted file mode 100644
index fc34e27..0000000
--- a/nixos/hosts/hamac/metadata.toml
+++ /dev/null
@@ -1 +0,0 @@
-channel = "nixos"
diff --git a/nixos/hosts/tente/metadata.toml b/nixos/hosts/tente/metadata.toml
deleted file mode 100644
index 58f0301..0000000
--- a/nixos/hosts/tente/metadata.toml
+++ /dev/null
@@ -1 +0,0 @@
-channel = "nixos-small"
diff --git a/nixos/rebuild b/nixos/rebuild
index d6a06a8..bb44fe8 100755
--- a/nixos/rebuild
+++ b/nixos/rebuild
@@ -32,8 +32,8 @@ nixpkgsPath=$(
     --expr '
       { host }:
       let
-        toml = builtins.readFile ./hosts/${host}/metadata.toml;
-        channel = (builtins.fromTOML toml).channel;
+        toml = builtins.readFile ./channels.toml;
+        channel = (builtins.fromTOML toml).${host};
       in
       (import ./npins).${channel}.outPath
     '
-- 
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