diff --git a/users/picnoir/tvix-daemon/Cargo.nix b/users/picnoir/tvix-daemon/Cargo.nix
index 12db15721..14fd16afb 100644
--- a/users/picnoir/tvix-daemon/Cargo.nix
+++ b/users/picnoir/tvix-daemon/Cargo.nix
@@ -1,5 +1,5 @@
-# This file was @generated by crate2nix 0.13.0 with the command:
-#   "generate" "--all-features"
+# This file was @generated by crate2nix 0.12.0 with the command:
+#   "generate"
 # See https://github.com/kolloch/crate2nix for more info.
 
 { nixpkgs ? <nixpkgs>
@@ -825,7 +825,7 @@ rec {
           "usage" = [ "clap_builder/usage" ];
           "wrap_help" = [ "clap_builder/wrap_help" ];
         };
-        resolvedDefaultFeatures = [ "color" "default" "derive" "error-context" "help" "std" "suggestions" "usage" ];
+        resolvedDefaultFeatures = [ "color" "default" "derive" "env" "error-context" "help" "std" "suggestions" "usage" ];
       };
       "clap_builder" = rec {
         crateName = "clap_builder";
@@ -864,7 +864,7 @@ rec {
           "unstable-v5" = [ "deprecated" ];
           "wrap_help" = [ "help" "dep:terminal_size" ];
         };
-        resolvedDefaultFeatures = [ "color" "error-context" "help" "std" "suggestions" "usage" ];
+        resolvedDefaultFeatures = [ "color" "env" "error-context" "help" "std" "suggestions" "usage" ];
       };
       "clap_derive" = rec {
         crateName = "clap_derive";
@@ -4160,7 +4160,7 @@ rec {
           {
             name = "clap";
             packageId = "clap";
-            features = [ "derive" ];
+            features = [ "derive" "env" ];
           }
           {
             name = "nix-compat";
@@ -5205,7 +5205,6 @@ rec {
               (
                 _: {
                   buildTests = true;
-                  release = false;
                 }
               );
             # If the user hasn't set any pre/post commands, we don't want to
@@ -5230,16 +5229,6 @@ rec {
             # recreate a file hierarchy as when running tests with cargo
 
             # the source for test data
-            # It's necessary to locate the source in $NIX_BUILD_TOP/source/
-            # instead of $NIX_BUILD_TOP/
-            # because we compiled those test binaries in the former and not the latter.
-            # So all paths will expect source tree to be there and not in the build top directly.
-            # For example: $NIX_BUILD_TOP := /build in general, if you ask yourself.
-            # TODO(raitobezarius): I believe there could be more edge cases if `crate.sourceRoot`
-            # do exist but it's very hard to reason about them, so let's wait until the first bug report.
-            mkdir -p source/
-            cd source/
-
             ${pkgs.buildPackages.xorg.lndir}/bin/lndir ${crate.src}
 
             # build outputs
diff --git a/users/picnoir/tvix-daemon/Cargo.toml b/users/picnoir/tvix-daemon/Cargo.toml
index da2ef6b09..00a7b7c10 100644
--- a/users/picnoir/tvix-daemon/Cargo.toml
+++ b/users/picnoir/tvix-daemon/Cargo.toml
@@ -10,7 +10,7 @@ tokio = { version = "1.36.0", features = ["full"] }
 tracing-subscriber = "0.3.18"
 tracing = "0.1.40"
 anyhow = "1.0.81"
-clap = { version = "4.5.3", features = ["derive"] }
+clap = { version = "4.5.3", features = ["derive", "env"] }
 
 [dev-dependencies]
 tokio-test = "0.4.4"
diff --git a/users/picnoir/tvix-daemon/src/main.rs b/users/picnoir/tvix-daemon/src/main.rs
index e302b83fc..7b1b735ba 100644
--- a/users/picnoir/tvix-daemon/src/main.rs
+++ b/users/picnoir/tvix-daemon/src/main.rs
@@ -2,7 +2,7 @@ use anyhow::anyhow;
 use clap::Parser;
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio_listener::{self, SystemOptions, UserOptions};
-use tracing::{debug, error, info, instrument};
+use tracing::{debug, error, info, instrument, Level};
 
 use nix_compat::wire::{bytes, primitive, worker_protocol};
 
@@ -11,14 +11,23 @@ struct Cli {
     /// Listening unix socket path
     #[arg(short, long)]
     socket: Option<String>,
+    /// Log verbosity level. Can be "error", "warn", "info", "debug", "trace", or a number 1-5
+    #[arg(short, long, env)]
+    verbosity: Option<Level>,
 }
 
 #[tokio::main]
 #[instrument()]
 async fn main() {
-    tracing_subscriber::fmt().compact().try_init().unwrap();
     let args = Cli::parse();
-
+    tracing_subscriber::fmt()
+        .compact()
+        .with_max_level(
+            args.verbosity
+                .unwrap_or_else(|| panic!("Can't parse log verbosity")),
+        )
+        .try_init()
+        .unwrap();
     info!("Started Tvix daemon");
     let addr = args
         .socket