filemerge: move :merge-local/other symlink check to precheck

In upcoming patches we're going to add more checks to the function currently
named _symlinkcheck. This consolidates all those checks.

mercurial/filemerge.py

@@ -1,585 +1,581 b''
 # filemerge.py - file-level merge handling for Mercurial
 #
 # Copyright 2006, 2007, 2008 Matt Mackall <[e-mail]>
 #
 # 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
 
 import filecmp
 import os
 import re
 import tempfile
 
 from .i18n import _
 from .node import short
 
 from . import (
     error,
     match,
     simplemerge,
     tagmerge,
     templatekw,
     templater,
     util,
 )
 
 def _toolstr(ui, tool, part, default=""):
     return ui.config("merge-tools", tool + "." + part, default)
 
 def _toolbool(ui, tool, part, default=False):
     return ui.configbool("merge-tools", tool + "." + part, default)
 
 def _toollist(ui, tool, part, default=[]):
     return ui.configlist("merge-tools", tool + "." + part, default)
 
 internals = {}
 # Merge tools to document.
 internalsdoc = {}
 
 # internal tool merge types
 nomerge = None
 mergeonly = 'mergeonly'  # just the full merge, no premerge
 fullmerge = 'fullmerge'  # both premerge and merge
 
 def internaltool(name, mergetype, onfailure=None, precheck=None):
     '''return a decorator for populating internal merge tool table'''
     def decorator(func):
         fullname = ':' + name
         func.__doc__ = "``%s``\n" % fullname + func.__doc__.strip()
         internals[fullname] = func
         internals['internal:' + name] = func
         internalsdoc[fullname] = func
         func.mergetype = mergetype
         func.onfailure = onfailure
         func.precheck = precheck
         return func
     return decorator
 
 def _findtool(ui, tool):
     if tool in internals:
         return tool
     return findexternaltool(ui, tool)
 
 def findexternaltool(ui, tool):
     for kn in ("regkey", "regkeyalt"):
         k = _toolstr(ui, tool, kn)
         if not k:
             continue
         p = util.lookupreg(k, _toolstr(ui, tool, "regname"))
         if p:
             p = util.findexe(p + _toolstr(ui, tool, "regappend"))
             if p:
                 return p
     exe = _toolstr(ui, tool, "executable", tool)
     return util.findexe(util.expandpath(exe))
 
 def _picktool(repo, ui, path, binary, symlink):
     def check(tool, pat, symlink, binary):
         tmsg = tool
         if pat:
             tmsg += " specified for " + pat
         if not _findtool(ui, tool):
             if pat: # explicitly requested tool deserves a warning
                 ui.warn(_("couldn't find merge tool %s\n") % tmsg)
             else: # configured but non-existing tools are more silent
                 ui.note(_("couldn't find merge tool %s\n") % tmsg)
         elif symlink and not _toolbool(ui, tool, "symlink"):
             ui.warn(_("tool %s can't handle symlinks\n") % tmsg)
         elif binary and not _toolbool(ui, tool, "binary"):
             ui.warn(_("tool %s can't handle binary\n") % tmsg)
         elif not util.gui() and _toolbool(ui, tool, "gui"):
             ui.warn(_("tool %s requires a GUI\n") % tmsg)
         else:
             return True
         return False
 
     # internal config: ui.forcemerge
     # forcemerge comes from command line arguments, highest priority
     force = ui.config('ui', 'forcemerge')
     if force:
         toolpath = _findtool(ui, force)
         if toolpath:
             return (force, util.shellquote(toolpath))
         else:
             # mimic HGMERGE if given tool not found
             return (force, force)
 
     # HGMERGE takes next precedence
     hgmerge = os.environ.get("HGMERGE")
     if hgmerge:
         return (hgmerge, hgmerge)
 
     # then patterns
     for pat, tool in ui.configitems("merge-patterns"):
         mf = match.match(repo.root, '', [pat])
         if mf(path) and check(tool, pat, symlink, False):
             toolpath = _findtool(ui, tool)
             return (tool, util.shellquote(toolpath))
 
     # then merge tools
     tools = {}
     disabled = set()
     for k, v in ui.configitems("merge-tools"):
         t = k.split('.')[0]
         if t not in tools:
             tools[t] = int(_toolstr(ui, t, "priority", "0"))
         if _toolbool(ui, t, "disabled", False):
             disabled.add(t)
     names = tools.keys()
     tools = sorted([(-p, t) for t, p in tools.items() if t not in disabled])
     uimerge = ui.config("ui", "merge")
     if uimerge:
         if uimerge not in names:
             return (uimerge, uimerge)
         tools.insert(0, (None, uimerge)) # highest priority
     tools.append((None, "hgmerge")) # the old default, if found
     for p, t in tools:
         if check(t, None, symlink, binary):
             toolpath = _findtool(ui, t)
             return (t, util.shellquote(toolpath))
 
     # internal merge or prompt as last resort
     if symlink or binary:
         return ":prompt", None
     return ":merge", None
 
 def _eoltype(data):
     "Guess the EOL type of a file"
     if '\0' in data: # binary
         return None
     if '\r\n' in data: # Windows
         return '\r\n'
     if '\r' in data: # Old Mac
         return '\r'
     if '\n' in data: # UNIX
         return '\n'
     return None # unknown
 
 def _matcheol(file, origfile):
     "Convert EOL markers in a file to match origfile"
     tostyle = _eoltype(util.readfile(origfile))
     if tostyle:
         data = util.readfile(file)
         style = _eoltype(data)
         if style:
             newdata = data.replace(style, tostyle)
             if newdata != data:
                 util.writefile(file, newdata)
 
 @internaltool('prompt', nomerge)
 def _iprompt(repo, mynode, orig, fcd, fco, fca, toolconf):
     """Asks the user which of the local or the other version to keep as
     the merged version."""
     ui = repo.ui
     fd = fcd.path()
 
     index = ui.promptchoice(_(" no tool found to merge %s\n"
                               "keep (l)ocal or take (o)ther?"
                               "$$ &Local $$ &Other") % fd, 0)
     choice = ['local', 'other'][index]
 
     if choice == 'other':
         return _iother(repo, mynode, orig, fcd, fco, fca, toolconf)
     else:
         return _ilocal(repo, mynode, orig, fcd, fco, fca, toolconf)
 
 @internaltool('local', nomerge)
 def _ilocal(repo, mynode, orig, fcd, fco, fca, toolconf):
     """Uses the local version of files as the merged version."""
     return 0
 
 @internaltool('other', nomerge)
 def _iother(repo, mynode, orig, fcd, fco, fca, toolconf):
     """Uses the other version of files as the merged version."""
     repo.wwrite(fcd.path(), fco.data(), fco.flags())
     return 0
 
 @internaltool('fail', nomerge)
 def _ifail(repo, mynode, orig, fcd, fco, fca, toolconf):
     """
     Rather than attempting to merge files that were modified on both
     branches, it marks them as unresolved. The resolve command must be
     used to resolve these conflicts."""
     return 1
 
 def _premerge(repo, toolconf, files, labels=None):
     tool, toolpath, binary, symlink = toolconf
     if symlink:
         return 1
     a, b, c, back = files
 
     ui = repo.ui
 
     validkeep = ['keep', 'keep-merge3']
 
     # do we attempt to simplemerge first?
     try:
         premerge = _toolbool(ui, tool, "premerge", not binary)
     except error.ConfigError:
         premerge = _toolstr(ui, tool, "premerge").lower()
         if premerge not in validkeep:
             _valid = ', '.join(["'" + v + "'" for v in validkeep])
             raise error.ConfigError(_("%s.premerge not valid "
                                       "('%s' is neither boolean nor %s)") %
                                     (tool, premerge, _valid))
 
     if premerge:
         if premerge == 'keep-merge3':
             if not labels:
                 labels = _defaultconflictlabels
             if len(labels) < 3:
                 labels.append('base')
         r = simplemerge.simplemerge(ui, a, b, c, quiet=True, label=labels)
         if not r:
             ui.debug(" premerge successful\n")
             return 0
         if premerge not in validkeep:
             util.copyfile(back, a) # restore from backup and try again
     return 1 # continue merging
 
 def _symlinkcheck(repo, mynode, orig, fcd, fco, fca, toolconf):
     tool, toolpath, binary, symlink = toolconf
     if symlink:
         repo.ui.warn(_('warning: internal %s cannot merge symlinks '
                        'for %s\n') % (tool, fcd.path()))
         return False
     return True
 
 def _merge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels, mode):
     """
     Uses the internal non-interactive simple merge algorithm for merging
     files. It will fail if there are any conflicts and leave markers in
     the partially merged file. Markers will have two sections, one for each side
     of merge, unless mode equals 'union' which suppresses the markers."""
     a, b, c, back = files
 
     ui = repo.ui
 
     r = simplemerge.simplemerge(ui, a, b, c, label=labels, mode=mode)
     return True, r
 
 @internaltool('union', fullmerge,
               _("warning: conflicts while merging %s! "
                 "(edit, then use 'hg resolve --mark')\n"),
               precheck=_symlinkcheck)
 def _iunion(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
     """
     Uses the internal non-interactive simple merge algorithm for merging
     files. It will use both left and right sides for conflict regions.
     No markers are inserted."""
     return _merge(repo, mynode, orig, fcd, fco, fca, toolconf,
                   files, labels, 'union')
 
 @internaltool('merge', fullmerge,
               _("warning: conflicts while merging %s! "
                 "(edit, then use 'hg resolve --mark')\n"),
               precheck=_symlinkcheck)
 def _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
     """
     Uses the internal non-interactive simple merge algorithm for merging
     files. It will fail if there are any conflicts and leave markers in
     the partially merged file. Markers will have two sections, one for each side
     of merge."""
     return _merge(repo, mynode, orig, fcd, fco, fca, toolconf,
                   files, labels, 'merge')
 
 @internaltool('merge3', fullmerge,
               _("warning: conflicts while merging %s! "
                 "(edit, then use 'hg resolve --mark')\n"),
               precheck=_symlinkcheck)
 def _imerge3(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
     """
     Uses the internal non-interactive simple merge algorithm for merging
     files. It will fail if there are any conflicts and leave markers in
     the partially merged file. Marker will have three sections, one from each
     side of the merge and one for the base content."""
     if not labels:
         labels = _defaultconflictlabels
     if len(labels) < 3:
         labels.append('base')
     return _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels)
 
 def _imergeauto(repo, mynode, orig, fcd, fco, fca, toolconf, files,
                 labels=None, localorother=None):
     """
     Generic driver for _imergelocal and _imergeother
     """
     assert localorother is not None
     tool, toolpath, binary, symlink = toolconf
-    if symlink:
-        repo.ui.warn(_('warning: :merge-%s cannot merge symlinks '
-                       'for %s\n') % (localorother, fcd.path()))
-        return False, 1
     a, b, c, back = files
     r = simplemerge.simplemerge(repo.ui, a, b, c, label=labels,
                                 localorother=localorother)
     return True, r
 
-@internaltool('merge-local', mergeonly)
+@internaltool('merge-local', mergeonly, precheck=_symlinkcheck)
 def _imergelocal(*args, **kwargs):
     """
     Like :merge, but resolve all conflicts non-interactively in favor
     of the local changes."""
     success, status = _imergeauto(localorother='local', *args, **kwargs)
     return success, status
 
-@internaltool('merge-other', mergeonly)
+@internaltool('merge-other', mergeonly, precheck=_symlinkcheck)
 def _imergeother(*args, **kwargs):
     """
     Like :merge, but resolve all conflicts non-interactively in favor
     of the other changes."""
     success, status = _imergeauto(localorother='other', *args, **kwargs)
     return success, status
 
 @internaltool('tagmerge', mergeonly,
               _("automatic tag merging of %s failed! "
                 "(use 'hg resolve --tool :merge' or another merge "
                 "tool of your choice)\n"))
 def _itagmerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
     """
     Uses the internal tag merge algorithm (experimental).
     """
     return tagmerge.merge(repo, fcd, fco, fca)
 
 @internaltool('dump', fullmerge)
 def _idump(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
     """
     Creates three versions of the files to merge, containing the
     contents of local, other and base. These files can then be used to
     perform a merge manually. If the file to be merged is named
     ``a.txt``, these files will accordingly be named ``a.txt.local``,
     ``a.txt.other`` and ``a.txt.base`` and they will be placed in the
     same directory as ``a.txt``."""
     a, b, c, back = files
 
     fd = fcd.path()
 
     util.copyfile(a, a + ".local")
     repo.wwrite(fd + ".other", fco.data(), fco.flags())
     repo.wwrite(fd + ".base", fca.data(), fca.flags())
     return False, 1
 
 def _xmerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
     tool, toolpath, binary, symlink = toolconf
     a, b, c, back = files
     out = ""
     env = {'HG_FILE': fcd.path(),
            'HG_MY_NODE': short(mynode),
            'HG_OTHER_NODE': str(fco.changectx()),
            'HG_BASE_NODE': str(fca.changectx()),
            'HG_MY_ISLINK': 'l' in fcd.flags(),
            'HG_OTHER_ISLINK': 'l' in fco.flags(),
            'HG_BASE_ISLINK': 'l' in fca.flags(),
            }
 
     ui = repo.ui
 
     args = _toolstr(ui, tool, "args", '$local $base $other')
     if "$output" in args:
         out, a = a, back # read input from backup, write to original
     replace = {'local': a, 'base': b, 'other': c, 'output': out}
     args = util.interpolate(r'\$', replace, args,
                             lambda s: util.shellquote(util.localpath(s)))
     cmd = toolpath + ' ' + args
     repo.ui.debug('launching merge tool: %s\n' % cmd)
     r = ui.system(cmd, cwd=repo.root, environ=env)
     repo.ui.debug('merge tool returned: %s\n' % r)
     return True, r
 
 def _formatconflictmarker(repo, ctx, template, label, pad):
     """Applies the given template to the ctx, prefixed by the label.
 
     Pad is the minimum width of the label prefix, so that multiple markers
     can have aligned templated parts.
     """
     if ctx.node() is None:
         ctx = ctx.p1()
 
     props = templatekw.keywords.copy()
     props['templ'] = template
     props['ctx'] = ctx
     props['repo'] = repo
     templateresult = template('conflictmarker', **props)
 
     label = ('%s:' % label).ljust(pad + 1)
     mark = '%s %s' % (label, templater.stringify(templateresult))
 
     if mark:
         mark = mark.splitlines()[0] # split for safety
 
     # 8 for the prefix of conflict marker lines (e.g. '<<<<<<< ')
     return util.ellipsis(mark, 80 - 8)
 
 _defaultconflictmarker = ('{node|short} ' +
     '{ifeq(tags, "tip", "", "{tags} ")}' +
     '{if(bookmarks, "{bookmarks} ")}' +
     '{ifeq(branch, "default", "", "{branch} ")}' +
     '- {author|user}: {desc|firstline}')
 
 _defaultconflictlabels = ['local', 'other']
 
 def _formatlabels(repo, fcd, fco, fca, labels):
     """Formats the given labels using the conflict marker template.
 
     Returns a list of formatted labels.
     """
     cd = fcd.changectx()
     co = fco.changectx()
     ca = fca.changectx()
 
     ui = repo.ui
     template = ui.config('ui', 'mergemarkertemplate', _defaultconflictmarker)
     tmpl = templater.templater(None, cache={'conflictmarker': template})
 
     pad = max(len(l) for l in labels)
 
     newlabels = [_formatconflictmarker(repo, cd, tmpl, labels[0], pad),
                  _formatconflictmarker(repo, co, tmpl, labels[1], pad)]
     if len(labels) > 2:
         newlabels.append(_formatconflictmarker(repo, ca, tmpl, labels[2], pad))
     return newlabels
 
 def _filemerge(premerge, repo, mynode, orig, fcd, fco, fca, labels=None):
     """perform a 3-way merge in the working directory
 
     premerge = whether this is a premerge
     mynode = parent node before merge
     orig = original local filename before merge
     fco = other file context
     fca = ancestor file context
     fcd = local file context for current/destination file
 
     Returns whether the merge is complete, and the return value of the merge.
     """
 
     def temp(prefix, ctx):
         pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
         (fd, name) = tempfile.mkstemp(prefix=pre)
         data = repo.wwritedata(ctx.path(), ctx.data())
         f = os.fdopen(fd, "wb")
         f.write(data)
         f.close()
         return name
 
     if not fco.cmp(fcd): # files identical?
         return True, None
 
     ui = repo.ui
     fd = fcd.path()
     binary = fcd.isbinary() or fco.isbinary() or fca.isbinary()
     symlink = 'l' in fcd.flags() + fco.flags()
     tool, toolpath = _picktool(repo, ui, fd, binary, symlink)
     if tool in internals and tool.startswith('internal:'):
         # normalize to new-style names (':merge' etc)
         tool = tool[len('internal'):]
     ui.debug("picked tool '%s' for %s (binary %s symlink %s)\n" %
                (tool, fd, binary, symlink))
 
     if tool in internals:
         func = internals[tool]
         mergetype = func.mergetype
         onfailure = func.onfailure
         precheck = func.precheck
     else:
         func = _xmerge
         mergetype = fullmerge
         onfailure = _("merging %s failed!\n")
         precheck = None
 
     toolconf = tool, toolpath, binary, symlink
 
     if mergetype == nomerge:
         return True, func(repo, mynode, orig, fcd, fco, fca, toolconf)
 
     if premerge:
         if orig != fco.path():
             ui.status(_("merging %s and %s to %s\n") % (orig, fco.path(), fd))
         else:
             ui.status(_("merging %s\n") % fd)
 
     ui.debug("my %s other %s ancestor %s\n" % (fcd, fco, fca))
 
     if precheck and not precheck(repo, mynode, orig, fcd, fco, fca,
                                  toolconf):
         if onfailure:
             ui.warn(onfailure % fd)
         return True, 1
 
     a = repo.wjoin(fd)
     b = temp("base", fca)
     c = temp("other", fco)
     back = a + ".orig"
     if premerge:
         util.copyfile(a, back)
     files = (a, b, c, back)
 
     r = 1
     try:
         markerstyle = ui.config('ui', 'mergemarkers', 'basic')
         if not labels:
             labels = _defaultconflictlabels
         if markerstyle != 'basic':
             labels = _formatlabels(repo, fcd, fco, fca, labels)
 
         if premerge and mergetype == fullmerge:
             r = _premerge(repo, toolconf, files, labels=labels)
             # complete if premerge successful (r is 0)
             return not r, r
 
         needcheck, r = func(repo, mynode, orig, fcd, fco, fca, toolconf, files,
                             labels=labels)
         if needcheck:
             r = _check(r, ui, tool, fcd, files)
 
         if r:
             if onfailure:
                 ui.warn(onfailure % fd)
 
         return True, r
     finally:
         if not r:
             util.unlink(back)
         util.unlink(b)
         util.unlink(c)
 
 def _check(r, ui, tool, fcd, files):
     fd = fcd.path()
     a, b, c, back = files
 
     if not r and (_toolbool(ui, tool, "checkconflicts") or
                   'conflicts' in _toollist(ui, tool, "check")):
         if re.search("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcd.data(),
                      re.MULTILINE):
             r = 1
 
     checked = False
     if 'prompt' in _toollist(ui, tool, "check"):
         checked = True
         if ui.promptchoice(_("was merge of '%s' successful (yn)?"
                              "$$ &Yes $$ &No") % fd, 1):
             r = 1
 
     if not r and not checked and (_toolbool(ui, tool, "checkchanged") or
                                   'changed' in
                                   _toollist(ui, tool, "check")):
         if filecmp.cmp(a, back):
             if ui.promptchoice(_(" output file %s appears unchanged\n"
                                  "was merge successful (yn)?"
                                  "$$ &Yes $$ &No") % fd, 1):
                 r = 1
 
     if _toolbool(ui, tool, "fixeol"):
         _matcheol(a, back)
 
     return r
 
 def premerge(repo, mynode, orig, fcd, fco, fca, labels=None):
     return _filemerge(True, repo, mynode, orig, fcd, fco, fca, labels=labels)
 
 def filemerge(repo, mynode, orig, fcd, fco, fca, labels=None):
     return _filemerge(False, repo, mynode, orig, fcd, fco, fca, labels=labels)
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = internals.values()

tests/test-merge-types.t

@@ -1,439 +1,439 b''
 #require symlink execbit
 
   $ tellmeabout() {
   > if [ -h $1 ]; then
   >     echo $1 is a symlink:
   >     $TESTDIR/readlink.py $1
   > elif [ -x $1 ]; then
   >     echo $1 is an executable file with content:
   >     cat $1
   > else
   >     echo $1 is a plain file with content:
   >     cat $1
   > fi
   > }
 
   $ hg init test1
   $ cd test1
 
   $ echo a > a
   $ hg ci -Aqmadd
   $ chmod +x a
   $ hg ci -mexecutable
 
   $ hg up -q 0
   $ rm a
   $ ln -s symlink a
   $ hg ci -msymlink
   created new head
 
 Symlink is local parent, executable is other:
 
   $ hg merge --debug
     searching for copies back to rev 1
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c334dc3be0da, local: 521a1e40188f+, remote: 3574f3e69b1c
    preserving a for resolve of a
    a: versions differ -> m (premerge)
   picked tool ':merge' for a (binary False symlink True)
   merging a
   my a@521a1e40188f+ other a@3574f3e69b1c ancestor a@c334dc3be0da
   warning: internal :merge cannot merge symlinks for a
   warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
 
   $ tellmeabout a
   a is a symlink:
   a -> symlink
   $ hg resolve a --tool internal:other
   (no more unresolved files)
   $ tellmeabout a
   a is an executable file with content:
   a
   $ hg st
   M a
   ? a.orig
 
 Symlink is other parent, executable is local:
 
   $ hg update -C 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg merge --debug --tool :union
     searching for copies back to rev 1
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f
    preserving a for resolve of a
    a: versions differ -> m (premerge)
   picked tool ':union' for a (binary False symlink True)
   merging a
   my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da
   warning: internal :union cannot merge symlinks for a
   warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
 
   $ tellmeabout a
   a is an executable file with content:
   a
 
   $ hg update -C 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg merge --debug --tool :merge3
     searching for copies back to rev 1
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f
    preserving a for resolve of a
    a: versions differ -> m (premerge)
   picked tool ':merge3' for a (binary False symlink True)
   merging a
   my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da
   warning: internal :merge3 cannot merge symlinks for a
   warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
 
   $ tellmeabout a
   a is an executable file with content:
   a
 
   $ hg update -C 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg merge --debug --tool :merge-local
     searching for copies back to rev 1
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f
    preserving a for resolve of a
    a: versions differ -> m (premerge)
   picked tool ':merge-local' for a (binary False symlink True)
   merging a
   my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da
-  warning: :merge-local cannot merge symlinks for a
+  warning: internal :merge-local cannot merge symlinks for a
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
 
   $ tellmeabout a
   a is an executable file with content:
   a
 
   $ hg update -C 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg merge --debug --tool :merge-other
     searching for copies back to rev 1
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f
    preserving a for resolve of a
    a: versions differ -> m (premerge)
   picked tool ':merge-other' for a (binary False symlink True)
   merging a
   my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da
-  warning: :merge-other cannot merge symlinks for a
+  warning: internal :merge-other cannot merge symlinks for a
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
 
   $ tellmeabout a
   a is an executable file with content:
   a
 
 Update to link without local change should get us a symlink (issue3316):
 
   $ hg up -C 0
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg up
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg st
   ? a.orig
 
 Update to link with local change should cause a merge prompt (issue3200):
 
   $ hg up -Cq 0
   $ echo data > a
   $ HGMERGE= hg up -y --debug
     searching for copies back to rev 2
   resolving manifests
    branchmerge: False, force: False, partial: False
    ancestor: c334dc3be0da, local: c334dc3be0da+, remote: 521a1e40188f
    preserving a for resolve of a
    a: versions differ -> m (premerge)
   (couldn't find merge tool hgmerge|tool hgmerge can't handle symlinks) (re)
   picked tool ':prompt' for a (binary False symlink True)
    no tool found to merge a
   keep (l)ocal or take (o)ther? l
   0 files updated, 1 files merged, 0 files removed, 0 files unresolved
   $ hg diff --git
   diff --git a/a b/a
   old mode 120000
   new mode 100644
   --- a/a
   +++ b/a
   @@ -1,1 +1,1 @@
   -symlink
   \ No newline at end of file
   +data
 
 
 Test only 'l' change - happens rarely, except when recovering from situations
 where that was what happened.
 
   $ hg init test2
   $ cd test2
   $ printf base > f
   $ hg ci -Aqm0
   $ echo file > f
   $ echo content >> f
   $ hg ci -qm1
   $ hg up -qr0
   $ rm f
   $ ln -s base f
   $ hg ci -qm2
   $ hg merge
   merging f
   warning: internal :merge cannot merge symlinks for f
   warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
   $ tellmeabout f
   f is a symlink:
   f -> base
 
   $ hg up -Cqr1
   $ hg merge
   merging f
   warning: internal :merge cannot merge symlinks for f
   warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
   $ tellmeabout f
   f is a plain file with content:
   file
   content
 
   $ cd ..
 
 Test removed 'x' flag merged with change to symlink
 
   $ hg init test3
   $ cd test3
   $ echo f > f
   $ chmod +x f
   $ hg ci -Aqm0
   $ chmod -x f
   $ hg ci -qm1
   $ hg up -qr0
   $ rm f
   $ ln -s dangling f
   $ hg ci -qm2
   $ hg merge
   merging f
   warning: internal :merge cannot merge symlinks for f
   warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
   $ tellmeabout f
   f is a symlink:
   f -> dangling
 
   $ hg up -Cqr1
   $ hg merge
   merging f
   warning: internal :merge cannot merge symlinks for f
   warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
   $ tellmeabout f
   f is a plain file with content:
   f
 
 Test removed 'x' flag merged with content change - both ways
 
   $ hg up -Cqr0
   $ echo change > f
   $ hg ci -qm3
   $ hg merge -r1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ tellmeabout f
   f is a plain file with content:
   change
 
   $ hg up -qCr1
   $ hg merge -r3
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ tellmeabout f
   f is a plain file with content:
   change
 
   $ cd ..
 
 Test merge with no common ancestor:
 a: just different
 b: x vs -, different (cannot calculate x, cannot ask merge tool)
 c: x vs -, same (cannot calculate x, merge tool is no good)
 d: x vs l, different
 e: x vs l, same
 f: - vs l, different
 g: - vs l, same
 h: l vs l, different
 (where same means the filelog entry is shared and there thus is an ancestor!)
 
   $ hg init test4
   $ cd test4
   $ echo 0 > 0
   $ hg ci -Aqm0
 
   $ echo 1 > a
   $ echo 1 > b
   $ chmod +x b
   $ echo x > c
   $ chmod +x c
   $ echo 1 > d
   $ chmod +x d
   $ printf x > e
   $ chmod +x e
   $ echo 1 > f
   $ printf x > g
   $ ln -s 1 h
   $ hg ci -qAm1
 
   $ hg up -qr0
   $ echo 2 > a
   $ echo 2 > b
   $ echo x > c
   $ ln -s 2 d
   $ ln -s x e
   $ ln -s 2 f
   $ ln -s x g
   $ ln -s 2 h
   $ hg ci -Aqm2
 
   $ hg merge
   merging a
   warning: cannot merge flags for b
   merging b
   warning: cannot merge flags for c
   merging d
   warning: internal :merge cannot merge symlinks for d
   warning: conflicts while merging d! (edit, then use 'hg resolve --mark')
   merging f
   warning: internal :merge cannot merge symlinks for f
   warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
   merging h
   warning: internal :merge cannot merge symlinks for h
   warning: conflicts while merging h! (edit, then use 'hg resolve --mark')
   warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
   warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
   3 files updated, 0 files merged, 0 files removed, 5 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
   $ hg resolve -l
   U a
   U b
   U d
   U f
   U h
   $ tellmeabout a
   a is a plain file with content:
   <<<<<<< local: 0139c5610547 - test: 2
   2
   =======
   1
   >>>>>>> other: 97e29675e796  - test: 1
   $ tellmeabout b
   b is a plain file with content:
   <<<<<<< local: 0139c5610547 - test: 2
   2
   =======
   1
   >>>>>>> other: 97e29675e796  - test: 1
   $ tellmeabout c
   c is a plain file with content:
   x
   $ tellmeabout d
   d is a symlink:
   d -> 2
   $ tellmeabout e
   e is a symlink:
   e -> x
   $ tellmeabout f
   f is a symlink:
   f -> 2
   $ tellmeabout g
   g is a symlink:
   g -> x
   $ tellmeabout h
   h is a symlink:
   h -> 2
 
   $ hg up -Cqr1
   $ hg merge
   merging a
   warning: cannot merge flags for b
   merging b
   warning: cannot merge flags for c
   merging d
   warning: internal :merge cannot merge symlinks for d
   warning: conflicts while merging d! (edit, then use 'hg resolve --mark')
   merging f
   warning: internal :merge cannot merge symlinks for f
   warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
   merging h
   warning: internal :merge cannot merge symlinks for h
   warning: conflicts while merging h! (edit, then use 'hg resolve --mark')
   warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
   warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
   3 files updated, 0 files merged, 0 files removed, 5 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
   [1]
   $ tellmeabout a
   a is a plain file with content:
   <<<<<<< local: 97e29675e796  - test: 1
   1
   =======
   2
   >>>>>>> other: 0139c5610547 - test: 2
   $ tellmeabout b
   b is an executable file with content:
   <<<<<<< local: 97e29675e796  - test: 1
   1
   =======
   2
   >>>>>>> other: 0139c5610547 - test: 2
   $ tellmeabout c
   c is an executable file with content:
   x
   $ tellmeabout d
   d is an executable file with content:
   1
   $ tellmeabout e
   e is an executable file with content:
   x (no-eol)
   $ tellmeabout f
   f is a plain file with content:
   1
   $ tellmeabout g
   g is a plain file with content:
   x (no-eol)
   $ tellmeabout h
   h is a symlink:
   h -> 1
 
   $ cd ..