Running nixpkgs-update (https://github.com/NixOS/infra/blob/main/non-critical-infra/modules/nixpkgs-update/README.md) with UPDATE_INFO: cpcm-x 0 -> 1
attrpath: cpcm-x
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/a5dgjpq8xbaf8rrg3krrsllsc1sppkz7-packages.json.drv
building '/nix/store/a5dgjpq8xbaf8rrg3krrsllsc1sppkz7-packages.json.drv'...

Going to be running update for following packages:
 - cpcm-x-1.1.0

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - cpcm-x-1.1.0: UPDATING ...
 - cpcm-x-1.1.0: DONE.

Packages updated!

The diff was empty after rewrites.