feat(server): Use hash of Nixery source as version

Uses a hash of Nixery's sources as the version displayed when Nixery
launches or logs an error. This makes it possible to distinguish
between errors logged from different versions.

The source hashes should be reproducible between different checkouts
of the same source tree.

1 files changed, 10 insertions, 1 deletions

diff --git a/tools/nixery/default.nix b/tools/nixery/default.nix
index c1a3c9f7dca5..20a5b50220e1 100644
--- a/tools/nixery/default.nix
+++ b/tools/nixery/default.nix
@@ -19,13 +19,22 @@
 with pkgs;
 
 rec {
+  # Hash of all Nixery sources - this is used as the Nixery version in
+  # builds to distinguish errors between deployed versions, see
+  # server/logs.go for details.
+  nixery-src-hash = pkgs.runCommand "nixery-src-hash" {} ''
+    echo ${./.} | grep -Eo '[a-z0-9]{32}' > $out
+  '';
+
   # Go implementation of the Nixery server which implements the
   # container registry interface.
   #
   # Users will usually not want to use this directly, instead see the
   # 'nixery' derivation below, which automatically includes runtime
   # data dependencies.
-  nixery-server = callPackage ./server { };
+  nixery-server = callPackage ./server {
+    srcHash = nixery-src-hash;
+  };
 
   # Implementation of the Nix image building logic
   nixery-build-image = import ./build-image { inherit pkgs; };