Re: RFE: support change-id generation natively

> On Mon, Oct 21, 2013 at 8:41 AM,  <james.moger@gitblit.com> wrote:
> > The change-id is exactly like a commit-id, it is an SHA-1 value, but it
> > is a constant embedded in the commit message.
> 
> https://gerrit-review.googlesource.com/Documentation/user-changeid.html
> goes into more detail about these.
> 
> > Commit-ids change all the time because of amend; change-ids are constant
> > and they are the key that links commit revisions to a discussion.
> 
> In a mailing list based workflow, when an author revises a patch
> series and resends the new patches aren't linked to the old patches in
> a MUA, because the Message-Ids of the original versions were not
> preserved. Imagine if Git saved that original Message-Id somewhere and
> could properly write In-Reply-To headers so that attempt #2 for each
> patch replies to the end of the thread discussing attempt #1 of the
> same patch. In a 30 patch series. Gerrit does this with Change-Id.
> 
> 
> We briefly considered putting the Change-Id into the commit headers
> (e.g. below the optional encoding) but could not because `git commit`
> doesn't support this. So it went into the footer along with
> Signed-off-by provenance data, which is also not expressible in
> headers.