--override-input: Imply --no-write-lock-file

Fixes #3779.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libcmd/installables.cc b/src/libcmd/installables.cc
index 7102f5a1a..898e642a5 100644
--- a/src/libcmd/installables.cc
+++ b/src/libcmd/installables.cc
@@ -111,10 +111,11 @@ MixFlakeOptions::MixFlakeOptions()
 
     addFlag({
         .longName = "override-input",
-        .description = "Override a specific flake input (e.g. `dwarffs/nixpkgs`).",
+        .description = "Override a specific flake input (e.g. `dwarffs/nixpkgs`). This implies `--no-write-lock-file`.",
         .category = category,
         .labels = {"input-path", "flake-url"},
         .handler = {[&](std::string inputPath, std::string flakeRef) {
+            lockFlags.writeLockFile = false;
             lockFlags.inputOverrides.insert_or_assign(
                 flake::parseInputPath(inputPath),
                 parseFlakeRef(flakeRef, absPath(".")));