this derivation will be built:
  /nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv
building '/nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv'
treefmt> ERRO formatter | nix: failed to apply with options '[]': exit status 1
treefmt> 
treefmt> nixfmt: lib/types: openTempFileWithDefaultPermissions: permission denied (Permission denied)
treefmt> HasCallStack backtrace:
treefmt>   collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception
treefmt>   toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/IO.hs:260:11 in ghc-internal:GHC.Internal.IO
treefmt>   throwIO, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:195:43 in ghc-internal:GHC.Internal.Control.Exception.Base
treefmt> 
treefmt> 
treefmt> 
treefmt> traversed 153 files
treefmt> emitted 123 files for processing
treefmt> formatted 0 files (0 changed) in 3.297s
treefmt> Error: failed to finalise formatting: formatting failures detected
error: build of '/nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv' on 'ssh-ng://customer@mac02' failed: Cannot build '/nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/qcg3mhk7kqrr4rzj87kbap9apyl6xqd0-treefmt
       Last 14 log lines:
       > ERRO formatter | nix: failed to apply with options '[]': exit status 1
       >
       > nixfmt: lib/types: openTempFileWithDefaultPermissions: permission denied (Permission denied)
       > 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 3.297s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv
error: Cannot build '/nix/store/m9sk64a744jwqnykghgpnp8y87wg7vs5-treefmt.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/qcg3mhk7kqrr4rzj87kbap9apyl6xqd0-treefmt