Find a change in a git repo via a string in actually git diffs (not just commit messages)

find.change.git.repo

# Find a change via a string in actually git diffs (not just commit messages)

GIT_REPO_DIR="<PATH_TO_YOU_REPO>"
TMP_DIR="/tmp"
STRING_TO_FIND="include openssh_server"

cd "$GIT_REPO_DIR"
> "${TMP_DIR}/git.rev.matches"
git rev-list HEAD |
while read rev; do
    if git show -p $rev | grep "$STRING_TO_FIND" >/dev/null; then
        echo $rev >> "${TMP_DIR}/git.rev.matches"
    fi
done
for rev in $(cat "${TMP_DIR}/git.rev.matches")
do
  git show $rev > "${TMP_DIR}/git.show.$rev"
  if cat "${TMP_DIR}/git.show.$rev" | grep "$STRING_TO_FIND" > /dev/null; then
    echo "
#################
# Found in $rev"
    cat "${TMP_DIR}/git.show.$rev" | grep "$STRING_TO_FIND"
  fi
done

# To see the whole git show do:
# cat "${TMP_DIR}/git.show.$rev"
# or
# git show $rev