mercurial/destutil.py
author Durham Goode <durham@fb.com>
Thu, 11 Feb 2016 17:04:33 -0800
changeset 28087 0b7ce0b16d8a
parent 28065 6b1fc09c699a
child 28102 bd74b5e0d2c0
permissions -rw-r--r--
pathauditor: change parts verification order to be root first Previously, when we verified the parts of a path in the auditor, we would validate the deepest directory first, then it's parent, and so on up to the root. If there happened to be a symlink in the chain, that meant our first check would likely traverse that symlink. In some cases that symlink might point to a network filesystem that is expensive, and therefore this simple check could be very slow. The fix is to check the path parts starting at the root and working our way down. This has a minor performance difference in that we used to be able to short circuit from the audit if we reached a directory that had already been checked. Now we can't, but the cost is N dictionary look ups, where N is the number of parts in the path, which should be fairly minor.

# destutil.py - Mercurial utility function for command destination
#
#  Copyright Matt Mackall <mpm@selenic.com> and other
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from .i18n import _
from . import (
    bookmarks,
    error,
    obsolete,
)

def _destupdatevalidate(repo, rev, clean, check):
    """validate that the destination comply to various rules

    This exists as its own function to help wrapping from extensions."""
    wc = repo[None]
    p1 = wc.p1()
    if not clean:
        # Check that the update is linear.
        #
        # Mercurial do not allow update-merge for non linear pattern
        # (that would be technically possible but was considered too confusing
        # for user a long time ago)
        #
        # See mercurial.merge.update for details
        if p1.rev() not in repo.changelog.ancestors([rev], inclusive=True):
            dirty = wc.dirty(missing=True)
            foreground = obsolete.foreground(repo, [p1.node()])
            if not repo[rev].node() in foreground:
                if dirty:
                    msg = _("uncommitted changes")
                    hint = _("commit and merge, or update --clean to"
                             " discard changes")
                    raise error.UpdateAbort(msg, hint=hint)
                elif not check:  # destination is not a descendant.
                    msg = _("not a linear update")
                    hint = _("merge or update --check to force update")
                    raise error.UpdateAbort(msg, hint=hint)

def _destupdateobs(repo, clean, check):
    """decide of an update destination from obsolescence markers"""
    node = None
    wc = repo[None]
    p1 = wc.p1()
    movemark = None

    if p1.obsolete() and not p1.children():
        # allow updating to successors
        successors = obsolete.successorssets(repo, p1.node())

        # behavior of certain cases is as follows,
        #
        # divergent changesets: update to highest rev, similar to what
        #     is currently done when there are more than one head
        #     (i.e. 'tip')
        #
        # replaced changesets: same as divergent except we know there
        # is no conflict
        #
        # pruned changeset: no update is done; though, we could
        #     consider updating to the first non-obsolete parent,
        #     similar to what is current done for 'hg prune'

        if successors:
            # flatten the list here handles both divergent (len > 1)
            # and the usual case (len = 1)
            successors = [n for sub in successors for n in sub]

            # get the max revision for the given successors set,
            # i.e. the 'tip' of a set
            node = repo.revs('max(%ln)', successors).first()
            if bookmarks.isactivewdirparent(repo):
                movemark = repo['.'].node()
    return node, movemark, None

def _destupdatebook(repo, clean, check):
    """decide on an update destination from active bookmark"""
    # we also move the active bookmark, if any
    activemark = None
    node, movemark = bookmarks.calculateupdate(repo.ui, repo, None)
    if node is not None:
        activemark = node
    return node, movemark, activemark

def _destupdatebranch(repo, clean, check):
    """decide on an update destination from current branch"""
    wc = repo[None]
    movemark = node = None
    try:
        node = repo.revs('max(.::(head() and branch(%s)))'
                         , wc.branch()).first()
        if bookmarks.isactivewdirparent(repo):
            movemark = repo['.'].node()
    except error.RepoLookupError:
        if wc.branch() == 'default': # no default branch!
            node = repo.lookup('tip') # update to tip
        else:
            raise error.Abort(_("branch %s not found") % wc.branch())
    return node, movemark, None

# order in which each step should be evalutated
# steps are run until one finds a destination
destupdatesteps = ['evolution', 'bookmark', 'branch']
# mapping to ease extension overriding steps.
destupdatestepmap = {'evolution': _destupdateobs,
                     'bookmark': _destupdatebook,
                     'branch': _destupdatebranch,
                     }

def destupdate(repo, clean=False, check=False):
    """destination for bare update operation

    return (rev, movemark, activemark)

    - rev: the revision to update to,
    - movemark: node to move the active bookmark from
                (cf bookmark.calculate update),
    - activemark: a bookmark to activate at the end of the update.
    """
    node = movemark = activemark = None

    for step in destupdatesteps:
        node, movemark, activemark = destupdatestepmap[step](repo, clean, check)
        if node is not None:
            break
    rev = repo[node].rev()

    _destupdatevalidate(repo, rev, clean, check)

    return rev, movemark, activemark

def _destmergebook(repo):
    """find merge destination in the active bookmark case"""
    node = None
    bmheads = repo.bookmarkheads(repo._activebookmark)
    curhead = repo[repo._activebookmark].node()
    if len(bmheads) == 2:
        if curhead == bmheads[0]:
            node = bmheads[1]
        else:
            node = bmheads[0]
    elif len(bmheads) > 2:
        raise error.Abort(_("multiple matching bookmarks to merge - "
            "please merge with an explicit rev or bookmark"),
            hint=_("run 'hg heads' to see all heads"))
    elif len(bmheads) <= 1:
        raise error.Abort(_("no matching bookmark to merge - "
            "please merge with an explicit rev or bookmark"),
            hint=_("run 'hg heads' to see all heads"))
    assert node is not None
    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:
        raise error.Abort(_("branch '%s' has %d heads - "
                           "please merge with an explicit rev")
                         % (branch, len(bheads)),
                         hint=_("run 'hg heads .' to see heads"))

    parent = repo.dirstate.p1()
    if len(nbhs) <= 1:
        if len(bheads) > 1:
            raise error.Abort(_("heads are bookmarked - "
                               "please merge with an explicit rev"),
                             hint=_("run 'hg heads' to see all heads"))
        if len(repo.heads()) > 1:
            raise error.Abort(_("branch '%s' has one head - "
                               "please merge with an explicit rev")
                             % branch,
                             hint=_("run 'hg heads' to see all heads"))
        msg, hint = _('nothing to merge'), None
        if parent != repo.lookup(branch):
            hint = _("use 'hg update' instead")
        raise error.Abort(msg, hint=hint)

    if parent not in bheads:
        raise error.Abort(_('working directory not at a head revision'),
                         hint=_("use 'hg update' or merge with an "
                                "explicit revision"))
    if parent == nbhs[0]:
        node = nbhs[-1]
    else:
        node = nbhs[0]
    assert node is not None
    return node

def destmerge(repo):
    if repo._activebookmark:
        node = _destmergebook(repo)
    else:
        node = _destmergebranch(repo)
    return repo[node].rev()

histeditdefaultrevset = 'reverse(only(.) and not public() and not ::merge())'

def desthistedit(ui, repo):
    """Default base revision to edit for `hg histedit`."""
    # Avoid cycle: scmutil -> revset -> destutil
    from . import scmutil

    default = ui.config('histedit', 'defaultrev', histeditdefaultrevset)
    if default:
        revs = scmutil.revrange(repo, [default])
        if revs:
            # The revset supplied by the user may not be in ascending order nor
            # take the first revision. So do this manually.
            revs.sort()
            return revs.first()

    return None

def _statusotherbook(ui, repo):
    bmheads = repo.bookmarkheads(repo._activebookmark)
    curhead = repo[repo._activebookmark].node()
    if repo.revs('%n and parents()', curhead):
        # we are on the active bookmark
        bmheads = [b for b in bmheads if curhead != b]
        if bmheads:
            msg = _('%i other divergent bookmarks for "%s"\n')
            ui.status(msg % (len(bmheads), repo._activebookmark))

def _statusotherbranchheads(ui, repo):
    currentbranch = repo.dirstate.branch()
    heads = repo.branchheads(currentbranch)
    l = len(heads)
    if repo.revs('%ln and parents()', heads):
        # we are on a head
        heads = repo.revs('%ln - parents()', heads)
        if heads and l != len(heads):
            ui.status(_('%i other heads for branch "%s"\n') %
                      (len(heads), currentbranch))

def statusotherdests(ui, repo):
    """Print message about other head"""
    # XXX we should probably include a hint:
    # - about what to do
    # - how to see such heads
    if repo._activebookmark:
        _statusotherbook(ui, repo)
    else:
        _statusotherbranchheads(ui, repo)