git-commit-export

#!/bin/sh

if [ -z "$1" ]; then
	echo "usage: $0 <path.patch> [commit]"
	exit 1
fi

set -e

COMMIT=${2:-HEAD}
FILENAME="$(git format-patch -1 $COMMIT)"
sed -f - -i "$FILENAME" << SED
/^From /,/^---$/ {
/^\s*$/ N
/^\s*\nPatch:/ d
}
SED

mv "$FILENAME" "$1"