How to change git commit message without changing commit hash

Question

The title is not exact, but I can\'t express it better in a single line.

• I actually know how to change git commit message like here.
• But I know it alwa

Answer 1

As various people have pointed out (e.g. in VonC's very useful answer), git notes really is the mechanism you're looking for. Is it not enough for you to change your alias to the following?

git log --oneline --show-notes

Presumably it's only occasionally that you'll have to add a note to a commit, and the notes will visually stand out in the output of that command.

If you really want to replace the subject of each commit if notes exist, you could always create a script along the lines of:

for c in $(git rev-list HEAD)
do
    n=$(git notes show $c 2> /dev/null)
    m=$(git show --oneline $c|head -1)
    if [ -n "$n" ]
    then
       m=${m/ */ $n}
    fi
    echo $m
done

... but that's a lot uglier for little gain, in my opinion.