Git新手求助：git diff误判相同文件存在差异

Hey there, let's work through why Git is showing a diff for js/bootstrap-datepicker.js when the actual file content looks identical. Since you replaced your working directory (including the .git folder) from a backup, that's almost certainly the trigger—Git depends heavily on the metadata in the .git folder to track files, so messing with that can cause weird discrepancies like this. Here are actionable steps to fix it:

• First, verify the files are truly identical
  Small, invisible differences (like whitespace or newline characters) are easy to miss. Let's use hashes to confirm:

  # Generate hash for your local file
  cat js/bootstrap-datepicker.js | md5sum
  # Generate hash for the version in bc_integration branch
  git show bc_integration:js/bootstrap-datepicker.js | md5sum
  

  If the hashes match, we know the content is identical and the issue lies with Git's metadata. If they don't, you'll need to dig into hidden characters or whitespace differences.

• Check for metadata mismatches (permissions, line endings)
  Git tracks file permissions and line endings even if content hasn't changed. Run this to see if the diff is about these attributes:

  git diff --stat bc_integration origin/feature/ui
  

  If you see 1 file changed, 0 insertions(+), 0 deletions(-), that confirms it's a metadata change. You can also ignore whitespace/line endings temporarily to verify:

  git diff -b -w bc_integration origin/feature/ui
  

  If the diff disappears here, line endings are the culprit. Check your core.autocrlf setting (a common cross-platform issue between WSL and Windows):

  git config core.autocrlf
  

  For WSL, setting it to input usually avoids newline conflicts with Windows.

• Refresh your remote branch cache
  Replacing the .git folder might have corrupted your local cache of the origin/feature/ui branch. Fetch the latest remote data to reset this:

  git fetch origin
  

  Run the diff again to see if the false discrepancy is gone.

• Reset the file in Git's index
  If the working directory file matches the branch version but Git's index is out of sync, reset it:

  git reset bc_integration -- js/bootstrap-datepicker.js
  

  This tells Git to update its index to match the bc_integration version of the file, resolving any lingering diff flags.

• Double-check the backup replacement
  If none of the above works, ensure the backup's .git folder was fully compatible with your current environment. Backups from different Git versions or OS environments can leave inconsistent metadata. As a last resort, try re-cloning the repository fresh to rule out lingering backup issues.

内容的提问来源于stack exchange，提问作者Marcellvs