this derivation will be built:
  /nix/store/7x7wcfjwcnnnr865v0bq277akcwniiqm-treefmt.drv
error: Cannot build '/nix/store/7x7wcfjwcnnnr865v0bq277akcwniiqm-treefmt.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/iv9hk6wq46hvpqz71s7iapq8zgr37b7r-treefmt
       Last 15 log lines:
       > tribuchet: building on jamie
       > ERRO formatter | nix: failed to apply with options '[]': exit status 1
       >
       > nixfmt: lib/types: openTempFileWithDefaultPermissions: permission denied (Read-only file system)
       > HasCallStack backtrace:
       >   collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception
       >   toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/IO.hs:260:11 in ghc-internal:GHC.Internal.IO
       >   throwIO, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:195:43 in ghc-internal:GHC.Internal.Control.Exception.Base
       >
       >
       >
       > traversed 153 files
       > emitted 123 files for processing
       > formatted 0 files (0 changed) in 1.154s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/7x7wcfjwcnnnr865v0bq277akcwniiqm-treefmt.drv