Git Error: insufficient permission for adding an object to repository database ./objects

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A user guest:devgroup could not push to a git repository specified by user:devgroup /var/git/foo.git. A git client of guestdev got below error.

$ git push (original master)
error: insufficient permission for adding an object to repository database ./objects

fatal: failed to write object
error: unpack failed: unpack-objects abnormal exit
To ssh://guestdev@foo.com/var/git/foo.git
 ! [remote rejected] master -> master (n/a (unpacker error))
error: failed to push some refs to 'ssh://guestdev@foo.com/var/git/foo.git'

Fixed the git daemon's settings with below commands. They made the daemon to use the group file permissions when writing to foo.git/objects.

cd /var/git/foo.git
sudo chmod -R g+ws *
sudo chgrp -R devgroup *
git repo-config core.sharedRepository true

cf. stackoverflow: Error pushing to GitHub - insufficient permission for adding an object to repository database

user:devgroup /var/git/foo.git という Git レポジトリに guestdev:devgroup が push しようとした際に以下のようなパーミッションエラーが出た．

$ git push (original master)
error: insufficient permission for adding an object to repository database ./objects

fatal: failed to write object
error: unpack failed: unpack-objects abnormal exit
To ssh://guestdev@foo.com/var/git/foo.git
 ! [remote rejected] master -> master (n/a (unpacker error))
error: failed to push some refs to 'ssh://guestdev@foo.com/var/git/foo.git'

以下のようにして解決した．

cd /var/git/foo.git
sudo chmod -R g+ws *
sudo chgrp -R devgroup *
git repo-config core.sharedRepository true

参考にした URL:
stackoverflow: Error pushing to GitHub - insufficient permission for adding an object to repository database