comparison mercurial/hg.py @ 17740:e6067bec18da

branchcache: fetch source branchcache during clone (issue3378)

Recomputing branch cache on clone may be expensive,
therefore if possible we fetch it along with the data.

- If the clone is performed by copying, we just copy branchcache file.
- If we localrepo.clone and streaming then we follow the procedure:
  1. Fetch branchmap from the remote
  2. Fetch the actual data.
  3. Find the latest rev within branch heads (tip at the time of
     branchmap fetch)
  4. Update the cache for the revs in [remotetip+1, tip]

This way we ensure that the branchcache is correct even in case
of races with commits.

17739:5b08e8b7ab00

                                     % dest)
                raise

            destlock = copystore(ui, srcrepo, destpath)

            # we need to re-init the repo after manually copying the data
            # into it
            destpeer = peer(ui, peeropts, dest)
            srcrepo.hook('outgoing', source='clone',
                          node=node.hex(node.nullid))

17740:e6067bec18da

                                     % dest)
                raise

            destlock = copystore(ui, srcrepo, destpath)

            # Recomputing branch cache might be slow on big repos,
            # so just copy it
            dstcachedir = os.path.join(destpath, 'cache')
            srcbranchcache = srcrepo.sjoin('cache/branchheads')
            dstbranchcache = os.path.join(dstcachedir, 'branchheads')
            if os.path.exists(srcbranchcache):
                if not os.path.exists(dstcachedir):
                    os.mkdir(dstcachedir)
                util.copyfile(srcbranchcache, dstbranchcache)

            # we need to re-init the repo after manually copying the data
            # into it
            destpeer = peer(ui, peeropts, dest)
            srcrepo.hook('outgoing', source='clone',
                          node=node.hex(node.nullid))