adguardhome: Add schema_version

This will add `passthru.schema_version` to be used as default value for
the adguardhome module.
It will also update the `update.sh` to keep the `schema_version` in sync
with the version by inspecting the sourcecode.

This might break existing configs, if they use deprecated values that don't
appear in newer schema_versions and schema_version wasn't set explicitly.
Explicit declarations of schema_version always have higher priority.

This also removes the `host` and `config` settings in favour of using the
appropriate `settings`.

Fixes #173938

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/pkgs/servers/adguardhome/default.nix b/pkgs/servers/adguardhome/default.nix
index 77531d4b28cb..2d2bafaa2048 100644
--- a/pkgs/servers/adguardhome/default.nix
+++ b/pkgs/servers/adguardhome/default.nix
@@ -16,6 +16,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = ./update.sh;
+    schema_version = 14;
     tests.adguardhome = nixosTests.adguardhome;
   };
 
diff --git a/pkgs/servers/adguardhome/update.sh b/pkgs/servers/adguardhome/update.sh
index 5f436bb126db..8a72bd5a7c99 100755
--- a/pkgs/servers/adguardhome/update.sh
+++ b/pkgs/servers/adguardhome/update.sh
@@ -13,6 +13,11 @@ version=$(jq -r '.tag_name' <<<"$latest_release")
 
 echo "got version $version"
 
+schema_version=$(curl --silent "https://raw.githubusercontent.com/AdguardTeam/AdGuardHome/${version}/internal/home/upgrade.go" \
+    | grep -Po '(?<=const currentSchemaVersion = )[[:digit:]]+$')
+
+echo "got schema_version $schema_version"
+
 declare -A systems
 systems[linux_386]=i686-linux
 systems[linux_amd64]=x86_64-linux
@@ -37,3 +42,4 @@ done
 echo '}' >> "$bins"
 
 sed -i -r -e "s/version\s*?=\s*?.*?;/version = \"${version#v}\";/" "$dirname/default.nix"
+sed -i -r -e "s/schema_version\s*?=\s*?.*?;/schema_version = ${schema_version};/" "$dirname/default.nix"