comparison mercurial/destutil.py @ 28103:7d852bb47b0a

merge: give priority to "not at head" failures for bare 'hg merge'

We refuse to pick a destination for a bare 'hg merge' if the working copy is not
at head. This is meant to prevent strange merge from user who forget to update.
(Moreover, such merge does not reduce actually the number of heads)

However, we were doing that as the last possible failure type. So user were
recommended to merge with an explicit head (from this bad location) if the
branch had too many heads.

We now make "not on branch heads" class of failure the first things to check
and fail on. The one test that change was actually trying to check for these
failure (and did not). The new test output is correct.

28102:bd74b5e0d2c0

    return node

def _destmergebranch(repo):
    """find merge destination based on branch heads"""
    node = None
    branch = repo[None].branch()
    bheads = repo.branchheads(branch)
    nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]

    if len(nbhs) > 2:
        msg, hint = msgdestmerge['toomanyheads']
        msg %= (branch, len(bheads))
        raise error.Abort(msg, hint=hint)

    parent = repo.dirstate.p1()
    if len(nbhs) <= 1:
        if len(bheads) > 1:
            msg, hint = msgdestmerge['bookmarkedheads']
        elif len(repo.heads()) > 1:
            msg, hint = msgdestmerge['nootherbranchheads']
            msg %= branch
        elif parent != repo.lookup(branch):
            msg, hint = msgdestmerge['nootherheadsbehind']
        else:
            msg, hint = msgdestmerge['nootherheads']
        raise error.Abort(msg, hint=hint)

    if parent not in bheads:
        msg, hint = msgdestmerge['notatheads']
        raise error.Abort(msg, hint=hint)
    if parent == nbhs[0]:
        node = nbhs[-1]
    else:
        node = nbhs[0]
    assert node is not None

28103:7d852bb47b0a

    return node

def _destmergebranch(repo):
    """find merge destination based on branch heads"""
    node = None
    parent = repo.dirstate.p1()
    branch = repo[None].branch()
    bheads = repo.branchheads(branch)
    nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]

    if parent not in bheads:
        if len(repo.heads()) <= 1:
            msg, hint = msgdestmerge['nootherheadsbehind']
        else:
            msg, hint = msgdestmerge['notatheads']
        raise error.Abort(msg, hint=hint)

    if len(nbhs) > 2:
        msg, hint = msgdestmerge['toomanyheads']
        msg %= (branch, len(bheads))
        raise error.Abort(msg, hint=hint)

    if len(nbhs) <= 1:
        if len(bheads) > 1:
            msg, hint = msgdestmerge['bookmarkedheads']
        elif len(repo.heads()) > 1:
            msg, hint = msgdestmerge['nootherbranchheads']
            msg %= branch
        else:
            msg, hint = msgdestmerge['nootherheads']
        raise error.Abort(msg, hint=hint)

    if parent == nbhs[0]:
        node = nbhs[-1]
    else:
        node = nbhs[0]
    assert node is not None