This repository has a tool called cr-update-reviewers that takes a Gerrit change on cr.joyent.us and updates the commit message for that change based on the approvals already there. It will create a new patchset for the change with the updated commit message.

Install with:

$ npm install -g git+https://github.com/joyent/cr-update-reviewers

Or clone this repo and build with make or npm install.

Here's an example of using it:

$ ./bin/cr-update-reviewers 684
Change 684 current commit message:
----------------------------------------------
joyent/node-fast#2 update dependencies to support Node v4
----------------------------------------------

+1s found in Gerrit:
    Code-Review          Brian Bennett <brian.bennett@joyent.com>
    Integration-Approval Alex Wilson <alex.wilson@joyent.com>

Suggested commit message:
------------------------------------------------
joyent/node-fast#2 update dependencies to support Node v4
Reviewed by: Brian Bennett <brian.bennett@joyent.com>
Approved by: Alex Wilson <alex.wilson@joyent.com>
------------------------------------------------

Create a new patchset with the suggested commit message? (y/[n]) 
Cloning joyent/node-fast to /var/tmp/cr-update-reviewers.32942.
Fetching patchset reference refs/changes/84/684/1.
Checking out patchset reference refs/changes/84/684/1.
Amending commit.
Pushing new patchset: git push origin HEAD:refs/changes/684
remote: Processing changes: updated: 1, refs: 1, done            
remote: (W) 2f8b6fe: no files changed, message updated        
remote: 
remote: Updated Changes:        
remote:   https://cr.joyent.us/684 joyent/node-fast#2 update dependencies to support Node v4 Reviewed by: Brian ...        
remote: 
To git+ssh://cr.joyent.us/joyent/node-fast.git
 * [new branch]      HEAD -> refs/changes/684

Cleaning up: rm -rf /var/tmp/cr-update-reviewers.32942

Note that there's a bug that sometimes causes it to hang on input even after you've answered the question. If you hit enter again, it should proceed.