comparison mercurial/merge.py @ 38494:d4be8ea8f22d

merge: add a 'keepconflictparent' argument to graft

Before this change, `merge.graft` was always dropping the "grafted" changeset
from the parent. This is impractical in case of conflict as the second parent
can be useful to help with conflict resolution.

We add a new boolean parameter to control this behavior. This will make using
`merge.graft` directly in shelve practicable.

Differential Revision: https://phab.mercurial-scm.org/D3692

38493:da2a7d8354b2

    if not partial:
        repo.hook('update', parent1=xp1, parent2=xp2,
                  error=stats.unresolvedcount)
    return stats

def graft(repo, ctx, pctx, labels, keepparent=False):
    """Do a graft-like merge.

    This is a merge where the merge ancestor is chosen such that one
    or more changesets are grafted onto the current changeset. In
    addition to the merge, this fixes up the dirstate to include only

    ctx - changeset to rebase
    pctx - merge base, usually ctx.p1()
    labels - merge labels eg ['local', 'graft']
    keepparent - keep second parent if any

    """
    # If we're grafting a descendant onto an ancestor, be sure to pass
    # mergeancestor=True to update. This does two things: 1) allows the merge if
    # the destination is the same as the parent of the ctx (so we can use graft

    mergeancestor = repo.changelog.isancestor(repo['.'].node(), ctx.node())

    stats = update(repo, ctx.node(), True, True, pctx.node(),
                   mergeancestor=mergeancestor, labels=labels)

    pother = nullid
    parents = ctx.parents()
    if keepparent and len(parents) == 2 and pctx in parents:
        parents.remove(pctx)
        pother = parents[0].node()

    with repo.dirstate.parentchange():
        repo.setparents(repo['.'].node(), pother)
        repo.dirstate.write(repo.currenttransaction())
        # fix up dirstate for copies and renames

38494:d4be8ea8f22d

    if not partial:
        repo.hook('update', parent1=xp1, parent2=xp2,
                  error=stats.unresolvedcount)
    return stats

def graft(repo, ctx, pctx, labels, keepparent=False,
          keepconflictparent=False):
    """Do a graft-like merge.

    This is a merge where the merge ancestor is chosen such that one
    or more changesets are grafted onto the current changeset. In
    addition to the merge, this fixes up the dirstate to include only

    ctx - changeset to rebase
    pctx - merge base, usually ctx.p1()
    labels - merge labels eg ['local', 'graft']
    keepparent - keep second parent if any
    keepparent - if unresolved, keep parent used for the merge

    """
    # If we're grafting a descendant onto an ancestor, be sure to pass
    # mergeancestor=True to update. This does two things: 1) allows the merge if
    # the destination is the same as the parent of the ctx (so we can use graft

    mergeancestor = repo.changelog.isancestor(repo['.'].node(), ctx.node())

    stats = update(repo, ctx.node(), True, True, pctx.node(),
                   mergeancestor=mergeancestor, labels=labels)


    if keepconflictparent and stats.unresolvedcount:
        pother = ctx.node()
    else:
        pother = nullid
        parents = ctx.parents()
        if keepparent and len(parents) == 2 and pctx in parents:
            parents.remove(pctx)
            pother = parents[0].node()

    with repo.dirstate.parentchange():
        repo.setparents(repo['.'].node(), pother)
        repo.dirstate.write(repo.currenttransaction())
        # fix up dirstate for copies and renames