comparison mercurial/exchange.py @ 45214:6063c1857d0a stable

exchange: backout changeset c26335fa4225

Changeset c26335fa4225 has good intends but introduce significant behavior
regressions for multiple important cases. In short there are many case where
push would have caught instability creation/propagation that are no longer
covered.  These behavior have been covered for many years and even if some
related case are not currently caught, the covered one should not be regressed.

The next four changesets introduce tests for some of these cases. However we
could produce many more tests cases since the area is wide and they are many
possible combination. (And we should cover them when getting back to this issue)

Since 5.5 is one week away, the most reasonable approach seems to back this out
while we devise a new way to move forward that preserve the current behavior,
catch more issues and also improves the situation that c26335fa4225 target.


In addition to the behavior change, c26335fa4225 also introduced output
changes. These output changes does not requires a backout per-se, but are part of
the same changeset. However they come with a couple of issues that also requires
attention:

1) the bulk of the error message have been shoehorned into a multiple line abort
message. This seems quite different from what we usually do. The abort message
should be a compact and efficient message, with extra details being issued as
normal error output beforehand. (with --verbose/--quiet) support.

2) the current output is unbounded, so if there is many (tens, hundreds,
thousands, …) of unstable/obsolete changeset involved in the push, the output
can quickly become a scary and un-usuable wall of text. So we need some
limitation here (same as we have with the remote head list that says A, B , C
and # others).

45212:41021660baa1

    # something to push
    if not pushop.force:
        # if repo.obsstore == False --> no obsolete
        # then, save the iteration
        if unfi.obsstore:
            obsoletes = []
            unstables = []
            for node in outgoing.missing:
                ctx = unfi[node]
                if ctx.obsolete():
                    obsoletes.append(ctx)
                elif ctx.isunstable():
                    unstables.append(ctx)
            if obsoletes or unstables:
                msg = b""
                if obsoletes:
                    msg += _(b"push includes obsolete changesets:\n")
                    msg += b"\n".join(b'  %s' % ctx for ctx in obsoletes)
                if unstables:
                    if msg:
                        msg += b"\n"
                    msg += _(b"push includes unstable changesets:\n")
                    msg += b"\n".join(
                        b'  %s (%s)'
                        % (
                            ctx,
                            b", ".join(_(ins) for ins in ctx.instabilities()),
                        )
                        for ctx in unstables
                    )
                raise error.Abort(msg)

        discovery.checkheads(pushop)
    return True

45214:6063c1857d0a

    # something to push
    if not pushop.force:
        # if repo.obsstore == False --> no obsolete
        # then, save the iteration
        if unfi.obsstore:
            # this message are here for 80 char limit reason
            mso = _(b"push includes obsolete changeset: %s!")
            mspd = _(b"push includes phase-divergent changeset: %s!")
            mscd = _(b"push includes content-divergent changeset: %s!")
            mst = {
                b"orphan": _(b"push includes orphan changeset: %s!"),
                b"phase-divergent": mspd,
                b"content-divergent": mscd,
            }
            # If we are to push if there is at least one
            # obsolete or unstable changeset in missing, at
            # least one of the missinghead will be obsolete or
            # unstable. So checking heads only is ok
            for node in outgoing.ancestorsof:
                ctx = unfi[node]
                if ctx.obsolete():
                    raise error.Abort(mso % ctx)
                elif ctx.isunstable():
                    # TODO print more than one instability in the abort
                    # message
                    raise error.Abort(mst[ctx.instabilities()[0]] % ctx)

        discovery.checkheads(pushop)
    return True