Note:
This page is primarily intended for developers of Mercurial.
This page describes the current plan to get a more modern and complete bundle format. (for old content of this page check BundleFormatHG19)
Contents
(current content is copy pasted from 2.9 sprint note)
New bundle format
* lightweight * new manifest * general delta * bookmarks * phase boundaries * obsolete markers * >sha1 support * pushkey * extensible for new features (required and optional) * progress information * resumable? * transaction commit markers?
It's possible to envision a format that sends a change, its manifest, and filenodes in each chunk rather than sending all changesets, then all manifests, etc. capabilities
New header
type Header struct {
length uint32
lNode byte
node [lNode]byte
// if empty (lP1 ==0) then default to previous node in the stream
lP1 byte
p1 [lP1]byte
// if empty, nullrev
lP2 byte
p2 [lP2]byte
// if empty, self (for changelogs)
lLinknode byte
linknode [lLinknode]byte
// if empty, p1
lDeltaParent byte
deltaParent [lDeltaParent]byte
}We'll modify the existing changegroup type so it can pretend to be a new changegroup that just has a variety of empty fields. Progress information fields might be optional.