git subtree push lost my commit message

Question

I have a git subtree my-subtree in my main repo my-repo that links to a remote repo. I made a commit to files belonging to my-subtree in my-repo.

Then I wanted to push these changes back to the remote repo so I ran this command

git subtree push --prefix=remote_repos/my-subtree --squash git@github.com:my-userame/my-subtree master

It pushed the changes fine but the git commit message was lost! And I got this message instead

Merge commit '64cda2e4fd5e166e79cfc8e3c1edffa3fae40308'

How can I get my original git message into the remote repo when I perform the git subtree push? sintead of getting Merge commit message?

Answer 1

You will find in many places in contrib/subtree/git-subtree.sh code like the one in add_squashed_msg:

add_squashed_msg()
{
  if [ -n "$message" ]; then
    echo "$message"
  else
    echo "Merge commit '$1' as '$2'"
  fi
}

That refers to the subtree option -m:

m,message= use the given message as the commit message for the merge commit options for 'split'

(note: this isn't just for 'split')

Set -m to the last commit message.