git filter-branch --msg-filter to reword a pushed commit message

Question

How can I reword the message of an old commit that is already pushed to a private remote? I want to keep the time stamps and tags.

I found this command here:

Answer 1

Here is a slightly improved version which also updates all references to commit hashes in commit messages on the fly when doing filter-branch:

rm -f /tmp/git;
touch /tmp/git;
git filter-branch \
    --subdirectory-filter  \
    --tag-name-filter cat \
    --commit-filter 'echo -n "s/${GIT_COMMIT}/" >>/tmp/git; \
                     NEW=`git_commit_non_empty_tree "$@"`; \
                     echo "${NEW}/g" >> /tmp/git; echo ${NEW}' \
    --msg-filter 'sed -f /tmp/git' \
    -- --all