What is going on in this pre-commit hook? I thought changing files would cause them to be restaged.
#!/bin/sh
#
# A git hook script to find and fix trailing whitespace
# in your commits. Bypass it with the --no-verify option
# to git-commit
#
if git-rev-parse --verify HEAD >/dev/null 2>&1 ; then
against=HEAD
else
# Initial commit: diff against an empty tree object
against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi
# Find files with trailing whitespace
for FILE in `exec git diff-index --check --cached $against -- | sed '/^[+-]/d' | sed -r 's/:[0-9]+:.*//' | uniq` ; do
# Fix them!
sed -i 's/[[:space:]]*$//' "$FILE"
done
# Now we can commit
exit
I think the idea is to remove trailing whitespace in all files this commit touches.