these 3 derivations will be built:
  /nix/store/0f8ksfqkjwi1jay2cq52yzg98fksmxa7-treefmt.toml.drv
  /nix/store/jdq9ygvaz8q5kfyw0rnx2lmrksibckw7-treefmt.drv
  /nix/store/08jndzcj25jlhnn13sbl6lkpfxb3vxhz-treefmt-check.drv
these 3 paths will be fetched (1.8 MiB download, 6.5 MiB unpacked):
  /nix/store/az01z3bj2xk98f4psypciwxn25hf7a5m-nixpkgs-fmt-1.3.0
  /nix/store/clb69ydfsjygp4i2b7md45dwb3m7wi7w-python3.14-black-26.5.1
  /nix/store/i4kwlf3zdb37vkr56irxi8lr4q6nz3q1-python3.14-pytokens-0.4.1
building '/nix/store/0f8ksfqkjwi1jay2cq52yzg98fksmxa7-treefmt.toml.drv'
treefmt.toml> tribuchet: building on jamie
treefmt.toml> structuredAttrs is enabled
building '/nix/store/jdq9ygvaz8q5kfyw0rnx2lmrksibckw7-treefmt.drv'
treefmt> tribuchet: building on jamie
building '/nix/store/08jndzcj25jlhnn13sbl6lkpfxb3vxhz-treefmt-check.drv'
treefmt-check> tribuchet: building on jamie
treefmt-check> treefmt v2.5.0ERRO formatter | python: failed to apply with options '[-eucx /nix/store/10dbhslywrm8g0jfgzfskiwpgnbsq4sb-ruff-0.15.22/bin/ruff --fix "$@"
treefmt-check> /nix/store/clb69ydfsjygp4i2b7md45dwb3m7wi7w-python3.14-black-26.5.1/bin/black "$@"
treefmt-check>  --]': exit status 2
treefmt-check> 
treefmt-check> + /nix/store/10dbhslywrm8g0jfgzfskiwpgnbsq4sb-ruff-0.15.22/bin/ruff --fix tests/command.py tests/conftest.py tests/random_service.py tests/root.py tests/systemd_vaultd.py tests/tempdir.py tests/test_blocking_secret.py tests/test_socket_activation.py tests/test_vault.py
treefmt-check> error: unexpected argument '--fix' found
treefmt-check> 
treefmt-check> Usage: ruff [OPTIONS] <COMMAND>
treefmt-check> 
treefmt-check> For more information, try '--help'.
treefmt-check> 
treefmt-check> traversed 45 files
treefmt-check> emitted 30 files for processing
treefmt-check> formatted 21 files (1 changed) in 240ms
treefmt-check> Error: failed to finalise formatting: formatting failures detected
error: Cannot build '/nix/store/08jndzcj25jlhnn13sbl6lkpfxb3vxhz-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/5zikbpv16s29xzgzlxa60ij8f4znkgh9-treefmt-check
       Last 16 log lines:
       > tribuchet: building on jamie
       > treefmt v2.5.0ERRO formatter | python: failed to apply with options '[-eucx /nix/store/10dbhslywrm8g0jfgzfskiwpgnbsq4sb-ruff-0.15.22/bin/ruff --fix "$@"
       > /nix/store/clb69ydfsjygp4i2b7md45dwb3m7wi7w-python3.14-black-26.5.1/bin/black "$@"
       >  --]': exit status 2
       >
       > + /nix/store/10dbhslywrm8g0jfgzfskiwpgnbsq4sb-ruff-0.15.22/bin/ruff --fix tests/command.py tests/conftest.py tests/random_service.py tests/root.py tests/systemd_vaultd.py tests/tempdir.py tests/test_blocking_secret.py tests/test_socket_activation.py tests/test_vault.py
       > error: unexpected argument '--fix' found
       >
       > Usage: ruff [OPTIONS] <COMMAND>
       >
       > For more information, try '--help'.
       >
       > traversed 45 files
       > emitted 30 files for processing
       > formatted 21 files (1 changed) in 240ms
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/08jndzcj25jlhnn13sbl6lkpfxb3vxhz-treefmt-check.drv