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-rw-r--r--tvix/boot/tests/default.nix6
1 files changed, 6 insertions, 0 deletions
diff --git a/tvix/boot/tests/default.nix b/tvix/boot/tests/default.nix
index 87530da0da8b..22f9de6bb5f7 100644
--- a/tvix/boot/tests/default.nix
+++ b/tvix/boot/tests/default.nix
@@ -23,6 +23,10 @@ let
 
     , importPathName ? null
 
+      # Commands to run before starting the tvix-daemon. Useful to provide
+      # auxillary mock services.
+    , preStart ? ""
+
       # The cmdline to pass to the VM.
       # Defaults to tvix.find, which lists all files in the store.
     , vmCmdline ? "tvix.find"
@@ -51,6 +55,8 @@ let
           # Ensure we can construct http clients.
           export SSL_CERT_FILE="${pkgs.cacert.out}/etc/ssl/certs/ca-bundle.crt"
 
+          ${preStart}
+
           # Start the tvix daemon, listening on a unix socket.
           BLOB_SERVICE_ADDR=${blobServiceAddr} \
             DIRECTORY_SERVICE_ADDR=${directoryServiceAddr} \