diff --git a/pkgs/build-support/dotnet/build-dotnet-module/default.nix b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
index 41f3271f10cc..b65aecd7e05c 100644
--- a/pkgs/build-support/dotnet/build-dotnet-module/default.nix
+++ b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
@@ -172,37 +172,41 @@ stdenvNoCC.mkDerivation (args // {
 
         export PATH="${lib.makeBinPath [ coreutils dotnet-sdk nuget-to-nix ]}"
 
-        case "''${1-}" in
-            --help|-h)
-                echo "usage: $0 <output path> [--help]"
-                echo "    <output path>  The path to write the lockfile to"
-                echo "    --help         Show this help message"
-                exit
-                ;;
-        esac
+        for arg in "$@"; do
+            case "$arg" in
+                --keep-sources|-k)
+                    keepSources=1
+                    shift
+                    ;;
+                --help|-h)
+                    echo "usage: $0 <output path> [--keep-sources] [--help]"
+                    echo "    <output path>   The path to write the lockfile to. A temporary file is used if this is not set"
+                    echo "    --keep-sources  Dont remove temporary directories upon exit, useful for debugging"
+                    echo "    --help          Show this help message"
+                    exit
+                    ;;
+            esac
+        done
 
-        deps_file="$(realpath "''${1:-$(mktemp -t "${pname}-deps-XXXXXX.nix")}")"
-        export HOME=$(mktemp -td "${pname}-home-XXXXXX")
-        mkdir -p "$HOME/nuget_pkgs"
+        exitTrap() {
+            test -n "''${ranTrap-}" && return
+            ranTrap=1
 
-        store_src="${srcOnly args}"
-        src="$(mktemp -td "${pname}-src-XXXXXX")"
-        cp -rT "$store_src" "$src"
-        chmod -R +w "$src"
-        trap "rm -rf $src $HOME" EXIT
+            if test -n "''${keepSources-}"; then
+                echo -e "Path to the source: $src\nPath to the fake home: $HOME"
+            else
+                rm -rf "$src" "$HOME"
+            fi
 
-        cd "$src"
-        echo "Restoring project..."
+            # Since mktemp is used this will be empty if the script didnt succesfully complete
+            ! test -s "$depsFile" && rm -rf "$depsFile"
+        }
 
-        export DOTNET_NOLOGO=1
-        export DOTNET_CLI_TELEMETRY_OPTOUT=1
-
-        declare -a projectFiles=( ${toString (lib.toList projectFile)} )
-        declare -a testProjectFiles=( ${toString (lib.toList testProjectFile)} )
+        trap exitTrap EXIT INT TERM
 
         dotnetRestore() {
             local -r project="''${1-}"
-            local -r rid="''${2-}"
+            local -r rid="$2"
 
             dotnet restore ''${project-} \
                 -p:ContinuousIntegrationBuild=true \
@@ -213,6 +217,24 @@ stdenvNoCC.mkDerivation (args // {
                 ${lib.optionalString (flags != []) (toString flags)}
         }
 
+        declare -a projectFiles=( ${toString (lib.toList projectFile)} )
+        declare -a testProjectFiles=( ${toString (lib.toList testProjectFile)} )
+
+        export HOME=$(mktemp -td "${pname}-home-XXXXXX")
+        export DOTNET_NOLOGO=1
+        export DOTNET_CLI_TELEMETRY_OPTOUT=1
+
+        depsFile="$(realpath "''${1:-$(mktemp -t "${pname}-deps-XXXXXX.nix")}")"
+        mkdir -p "$HOME/nuget_pkgs"
+
+        storeSrc="${srcOnly args}"
+        src="$(mktemp -td "${pname}-src-XXXXXX")"
+        cp -rT "$storeSrc" "$src"
+        chmod -R +w "$src"
+
+        cd "$src"
+        echo "Restoring project..."
+
         for rid in "${lib.concatStringsSep "\" \"" runtimeIds}"; do
             (( ''${#projectFiles[@]} == 0 )) && dotnetRestore "" "$rid"
 
@@ -224,9 +246,9 @@ stdenvNoCC.mkDerivation (args // {
         echo "Succesfully restored project"
 
         echo "Writing lockfile..."
-        echo -e "# This file was automatically generated by passthru.fetch-deps.\n# Please dont edit it manually, your changes might get overwritten!\n" > "$deps_file"
-        nuget-to-nix "$HOME/nuget_pkgs" "${exclusions}" >> "$deps_file"
-        echo "Succesfully wrote lockfile to: $deps_file"
+        echo -e "# This file was automatically generated by passthru.fetch-deps.\n# Please dont edit it manually, your changes might get overwritten!\n" > "$depsFile"
+        nuget-to-nix "$HOME/nuget_pkgs" "${exclusions}" >> "$depsFile"
+        echo "Succesfully wrote lockfile to $depsFile"
       '';
   } // args.passthru or { };