Summary

prek auto-update --freeze adds 2 spaces before the # frozen: comment. prettier enforces a single space before inline # comments in yaml, so the subsequent prek run -a reformats the modified lines and reports the run as failed.

Reproduction

prek run -a                  # passes, prettier formats file with 1 space
prek auto-update --freeze    # updates revs, adds 2 spaces before # frozen:
prek run -a                  # prettier hook rewrites the lines → hook fails

Example output of auto-update --freeze

- repo: https://github.com/rbubley/mirrors-prettier
  rev: b25652612a4a3c1da8caccfca9af661db56b2c07  # frozen: v3.8.2
#                                              ^^

Expected

rev: b25652612a4a3c1da8caccfca9af661db56b2c07 # frozen: v3.8.2

Suggested fix

Use a single space when appending the frozen comment.