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# merge.py - directory-level update/merge handling for Mercurial
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#
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# Copyright 2006, 2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from node import nullid, nullrev, hex, bin
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from i18n import _
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import util, filemerge, copies, subrepo
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import errno, os, shutil
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class mergestate(object):
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'''track 3-way merge state of individual files'''
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def __init__(self, repo):
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self._repo = repo
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self._dirty = False
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self._read()
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def reset(self, node=None):
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self._state = {}
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if node:
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self._local = node
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shutil.rmtree(self._repo.join("merge"), True)
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self._dirty = False
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def _read(self):
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self._state = {}
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try:
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f = self._repo.opener("merge/state")
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for i, l in enumerate(f):
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if i == 0:
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self._local = bin(l[:-1])
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else:
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bits = l[:-1].split("\0")
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self._state[bits[0]] = bits[1:]
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f.close()
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except IOError, err:
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if err.errno != errno.ENOENT:
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raise
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self._dirty = False
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def commit(self):
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if self._dirty:
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f = self._repo.opener("merge/state", "w")
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f.write(hex(self._local) + "\n")
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for d, v in self._state.iteritems():
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f.write("\0".join([d] + v) + "\n")
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f.close()
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self._dirty = False
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def add(self, fcl, fco, fca, fd, flags):
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hash = util.sha1(fcl.path()).hexdigest()
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self._repo.opener("merge/" + hash, "w").write(fcl.data())
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self._state[fd] = ['u', hash, fcl.path(), fca.path(),
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hex(fca.filenode()), fco.path(), flags]
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self._dirty = True
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def __contains__(self, dfile):
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return dfile in self._state
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def __getitem__(self, dfile):
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return self._state[dfile][0]
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def __iter__(self):
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l = self._state.keys()
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l.sort()
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for f in l:
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yield f
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def mark(self, dfile, state):
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self._state[dfile][0] = state
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self._dirty = True
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def resolve(self, dfile, wctx, octx):
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if self[dfile] == 'r':
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return 0
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state, hash, lfile, afile, anode, ofile, flags = self._state[dfile]
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f = self._repo.opener("merge/" + hash)
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self._repo.wwrite(dfile, f.read(), flags)
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f.close()
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fcd = wctx[dfile]
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fco = octx[ofile]
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fca = self._repo.filectx(afile, fileid=anode)
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r = filemerge.filemerge(self._repo, self._local, lfile, fcd, fco, fca)
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if r is None:
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# no real conflict
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del self._state[dfile]
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elif not r:
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self.mark(dfile, 'r')
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return r
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def _checkunknown(wctx, mctx):
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"check for collisions between unknown files and files in mctx"
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for f in wctx.unknown():
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if f in mctx and mctx[f].cmp(wctx[f]):
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raise util.Abort(_("untracked file in working directory differs"
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" from file in requested revision: '%s'") % f)
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def _checkcollision(mctx):
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"check for case folding collisions in the destination context"
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folded = {}
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for fn in mctx:
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fold = fn.lower()
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if fold in folded:
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raise util.Abort(_("case-folding collision between %s and %s")
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% (fn, folded[fold]))
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folded[fold] = fn
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def _forgetremoved(wctx, mctx, branchmerge):
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"""
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Forget removed files
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If we're jumping between revisions (as opposed to merging), and if
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neither the working directory nor the target rev has the file,
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then we need to remove it from the dirstate, to prevent the
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dirstate from listing the file when it is no longer in the
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manifest.
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If we're merging, and the other revision has removed a file
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that is not present in the working directory, we need to mark it
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as removed.
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"""
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action = []
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state = branchmerge and 'r' or 'f'
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for f in wctx.deleted():
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if f not in mctx:
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action.append((f, state))
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if not branchmerge:
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for f in wctx.removed():
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if f not in mctx:
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action.append((f, "f"))
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return action
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def manifestmerge(repo, p1, p2, pa, overwrite, partial):
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"""
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Merge p1 and p2 with ancestor pa and generate merge action list
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overwrite = whether we clobber working files
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partial = function to filter file lists
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"""
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def fmerge(f, f2, fa):
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"""merge flags"""
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a, m, n = ma.flags(fa), m1.flags(f), m2.flags(f2)
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if m == n: # flags agree
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return m # unchanged
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if m and n and not a: # flags set, don't agree, differ from parent
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r = repo.ui.promptchoice(
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_(" conflicting flags for %s\n"
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"(n)one, e(x)ec or sym(l)ink?") % f,
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(_("&None"), _("E&xec"), _("Sym&link")), 0)
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if r == 1:
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return "x" # Exec
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if r == 2:
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return "l" # Symlink
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return ""
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if m and m != a: # changed from a to m
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return m
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if n and n != a: # changed from a to n
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return n
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return '' # flag was cleared
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def act(msg, m, f, *args):
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repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m))
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action.append((f, m) + args)
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action, copy = [], {}
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if overwrite:
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pa = p1
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elif pa == p2: # backwards
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pa = p1.p1()
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elif pa and repo.ui.configbool("merge", "followcopies", True):
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dirs = repo.ui.configbool("merge", "followdirs", True)
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copy, diverge = copies.copies(repo, p1, p2, pa, dirs)
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for of, fl in diverge.iteritems():
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act("divergent renames", "dr", of, fl)
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repo.ui.note(_("resolving manifests\n"))
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repo.ui.debug(" overwrite %s partial %s\n" % (overwrite, bool(partial)))
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repo.ui.debug(" ancestor %s local %s remote %s\n" % (pa, p1, p2))
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m1, m2, ma = p1.manifest(), p2.manifest(), pa.manifest()
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copied = set(copy.values())
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if '.hgsubstate' in m1:
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# check whether sub state is modified
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for s in p1.substate:
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if p1.sub(s).dirty():
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m1['.hgsubstate'] += "+"
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break
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# Compare manifests
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for f, n in m1.iteritems():
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if partial and not partial(f):
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continue
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if f in m2:
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rflags = fmerge(f, f, f)
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a = ma.get(f, nullid)
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if n == m2[f] or m2[f] == a: # same or local newer
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# is file locally modified or flags need changing?
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# dirstate flags may need to be made current
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if m1.flags(f) != rflags or n[20:]:
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act("update permissions", "e", f, rflags)
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elif n == a: # remote newer
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act("remote is newer", "g", f, rflags)
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else: # both changed
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act("versions differ", "m", f, f, f, rflags, False)
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elif f in copied: # files we'll deal with on m2 side
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pass
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elif f in copy:
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f2 = copy[f]
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if f2 not in m2: # directory rename
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act("remote renamed directory to " + f2, "d",
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f, None, f2, m1.flags(f))
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else: # case 2 A,B/B/B or case 4,21 A/B/B
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act("local copied/moved to " + f2, "m",
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f, f2, f, fmerge(f, f2, f2), False)
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elif f in ma: # clean, a different, no remote
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if n != ma[f]:
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if repo.ui.promptchoice(
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_(" local changed %s which remote deleted\n"
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"use (c)hanged version or (d)elete?") % f,
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(_("&Changed"), _("&Delete")), 0):
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act("prompt delete", "r", f)
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else:
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act("prompt keep", "a", f)
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elif n[20:] == "a": # added, no remote
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act("remote deleted", "f", f)
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elif n[20:] != "u":
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act("other deleted", "r", f)
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for f, n in m2.iteritems():
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if partial and not partial(f):
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continue
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if f in m1 or f in copied: # files already visited
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continue
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if f in copy:
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f2 = copy[f]
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if f2 not in m1: # directory rename
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act("local renamed directory to " + f2, "d",
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None, f, f2, m2.flags(f))
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elif f2 in m2: # rename case 1, A/A,B/A
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act("remote copied to " + f, "m",
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f2, f, f, fmerge(f2, f, f2), False)
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else: # case 3,20 A/B/A
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act("remote moved to " + f, "m",
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f2, f, f, fmerge(f2, f, f2), True)
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elif f not in ma:
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act("remote created", "g", f, m2.flags(f))
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elif n != ma[f]:
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if repo.ui.promptchoice(
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_("remote changed %s which local deleted\n"
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"use (c)hanged version or leave (d)eleted?") % f,
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(_("&Changed"), _("&Deleted")), 0) == 0:
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act("prompt recreating", "g", f, m2.flags(f))
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return action
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def actionkey(a):
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return a[1] == 'r' and -1 or 0, a
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def applyupdates(repo, action, wctx, mctx, actx, overwrite):
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"""apply the merge action list to the working directory
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wctx is the working copy context
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mctx is the context to be merged into the working copy
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actx is the context of the common ancestor
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Return a tuple of counts (updated, merged, removed, unresolved) that
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describes how many files were affected by the update.
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"""
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updated, merged, removed, unresolved = 0, 0, 0, 0
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ms = mergestate(repo)
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ms.reset(wctx.parents()[0].node())
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moves = []
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action.sort(key=actionkey)
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substate = wctx.substate # prime
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# prescan for merges
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u = repo.ui
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for a in action:
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f, m = a[:2]
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if m == 'm': # merge
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f2, fd, flags, move = a[2:]
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if f == '.hgsubstate': # merged internally
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continue
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repo.ui.debug("preserving %s for resolve of %s\n" % (f, fd))
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fcl = wctx[f]
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fco = mctx[f2]
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if mctx == actx: # backwards, use working dir parent as ancestor
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if fcl.parents():
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fca = fcl.parents()[0]
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else:
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fca = repo.filectx(f, fileid=nullrev)
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else:
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fca = fcl.ancestor(fco, actx)
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if not fca:
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fca = repo.filectx(f, fileid=nullrev)
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ms.add(fcl, fco, fca, fd, flags)
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if f != fd and move:
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moves.append(f)
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# remove renamed files after safely stored
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for f in moves:
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if os.path.lexists(repo.wjoin(f)):
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repo.ui.debug("removing %s\n" % f)
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os.unlink(repo.wjoin(f))
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audit_path = util.path_auditor(repo.root)
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numupdates = len(action)
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for i, a in enumerate(action):
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f, m = a[:2]
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u.progress(_('updating'), i + 1, item=f, total=numupdates,
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unit=_('files'))
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if f and f[0] == "/":
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continue
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if m == "r": # remove
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repo.ui.note(_("removing %s\n") % f)
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audit_path(f)
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if f == '.hgsubstate': # subrepo states need updating
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subrepo.submerge(repo, wctx, mctx, wctx, overwrite)
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try:
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util.unlinkpath(repo.wjoin(f))
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except OSError, inst:
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if inst.errno != errno.ENOENT:
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repo.ui.warn(_("update failed to remove %s: %s!\n") %
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(f, inst.strerror))
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removed += 1
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elif m == "m": # merge
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if f == '.hgsubstate': # subrepo states need updating
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subrepo.submerge(repo, wctx, mctx, wctx.ancestor(mctx), overwrite)
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continue
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f2, fd, flags, move = a[2:]
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r = ms.resolve(fd, wctx, mctx)
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if r is not None and r > 0:
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unresolved += 1
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else:
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if r is None:
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updated += 1
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else:
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merged += 1
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util.set_flags(repo.wjoin(fd), 'l' in flags, 'x' in flags)
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if (move and repo.dirstate.normalize(fd) != f
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and os.path.lexists(repo.wjoin(f))):
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repo.ui.debug("removing %s\n" % f)
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os.unlink(repo.wjoin(f))
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elif m == "g": # get
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flags = a[2]
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repo.ui.note(_("getting %s\n") % f)
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t = mctx.filectx(f).data()
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repo.wwrite(f, t, flags)
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t = None
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updated += 1
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if f == '.hgsubstate': # subrepo states need updating
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subrepo.submerge(repo, wctx, mctx, wctx, overwrite)
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elif m == "d": # directory rename
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f2, fd, flags = a[2:]
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if f:
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repo.ui.note(_("moving %s to %s\n") % (f, fd))
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t = wctx.filectx(f).data()
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repo.wwrite(fd, t, flags)
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util.unlinkpath(repo.wjoin(f))
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if f2:
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repo.ui.note(_("getting %s to %s\n") % (f2, fd))
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t = mctx.filectx(f2).data()
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repo.wwrite(fd, t, flags)
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updated += 1
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elif m == "dr": # divergent renames
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fl = a[2]
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repo.ui.warn(_("note: possible conflict - %s was renamed "
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"multiple times to:\n") % f)
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for nf in fl:
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repo.ui.warn(" %s\n" % nf)
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elif m == "e": # exec
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flags = a[2]
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util.set_flags(repo.wjoin(f), 'l' in flags, 'x' in flags)
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ms.commit()
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u.progress(_('updating'), None, total=numupdates, unit=_('files'))
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return updated, merged, removed, unresolved
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def recordupdates(repo, action, branchmerge):
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"record merge actions to the dirstate"
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for a in action:
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f, m = a[:2]
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if m == "r": # remove
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if branchmerge:
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repo.dirstate.remove(f)
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else:
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repo.dirstate.forget(f)
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elif m == "a": # re-add
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if not branchmerge:
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repo.dirstate.add(f)
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elif m == "f": # forget
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repo.dirstate.forget(f)
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elif m == "e": # exec change
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repo.dirstate.normallookup(f)
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elif m == "g": # get
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if branchmerge:
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repo.dirstate.otherparent(f)
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else:
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repo.dirstate.normal(f)
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elif m == "m": # merge
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f2, fd, flag, move = a[2:]
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if branchmerge:
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# We've done a branch merge, mark this file as merged
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# so that we properly record the merger later
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repo.dirstate.merge(fd)
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if f != f2: # copy/rename
|
|
|
if move:
|
|
|
repo.dirstate.remove(f)
|
|
|
if f != fd:
|
|
|
repo.dirstate.copy(f, fd)
|
|
|
else:
|
|
|
repo.dirstate.copy(f2, fd)
|
|
|
else:
|
|
|
# We've update-merged a locally modified file, so
|
|
|
# we set the dirstate to emulate a normal checkout
|
|
|
# of that file some time in the past. Thus our
|
|
|
# merge will appear as a normal local file
|
|
|
# modification.
|
|
|
if f2 == fd: # file not locally copied/moved
|
|
|
repo.dirstate.normallookup(fd)
|
|
|
if move:
|
|
|
repo.dirstate.forget(f)
|
|
|
elif m == "d": # directory rename
|
|
|
f2, fd, flag = a[2:]
|
|
|
if not f2 and f not in repo.dirstate:
|
|
|
# untracked file moved
|
|
|
continue
|
|
|
if branchmerge:
|
|
|
repo.dirstate.add(fd)
|
|
|
if f:
|
|
|
repo.dirstate.remove(f)
|
|
|
repo.dirstate.copy(f, fd)
|
|
|
if f2:
|
|
|
repo.dirstate.copy(f2, fd)
|
|
|
else:
|
|
|
repo.dirstate.normal(fd)
|
|
|
if f:
|
|
|
repo.dirstate.forget(f)
|
|
|
|
|
|
def update(repo, node, branchmerge, force, partial):
|
|
|
"""
|
|
|
Perform a merge between the working directory and the given node
|
|
|
|
|
|
node = the node to update to, or None if unspecified
|
|
|
branchmerge = whether to merge between branches
|
|
|
force = whether to force branch merging or file overwriting
|
|
|
partial = a function to filter file lists (dirstate not updated)
|
|
|
|
|
|
The table below shows all the behaviors of the update command
|
|
|
given the -c and -C or no options, whether the working directory
|
|
|
is dirty, whether a revision is specified, and the relationship of
|
|
|
the parent rev to the target rev (linear, on the same named
|
|
|
branch, or on another named branch).
|
|
|
|
|
|
This logic is tested by test-update-branches.t.
|
|
|
|
|
|
-c -C dirty rev | linear same cross
|
|
|
n n n n | ok (1) x
|
|
|
n n n y | ok ok ok
|
|
|
n n y * | merge (2) (2)
|
|
|
n y * * | --- discard ---
|
|
|
y n y * | --- (3) ---
|
|
|
y n n * | --- ok ---
|
|
|
y y * * | --- (4) ---
|
|
|
|
|
|
x = can't happen
|
|
|
* = don't-care
|
|
|
1 = abort: crosses branches (use 'hg merge' or 'hg update -c')
|
|
|
2 = abort: crosses branches (use 'hg merge' to merge or
|
|
|
use 'hg update -C' to discard changes)
|
|
|
3 = abort: uncommitted local changes
|
|
|
4 = incompatible options (checked in commands.py)
|
|
|
|
|
|
Return the same tuple as applyupdates().
|
|
|
"""
|
|
|
|
|
|
onode = node
|
|
|
wlock = repo.wlock()
|
|
|
try:
|
|
|
wc = repo[None]
|
|
|
if node is None:
|
|
|
# tip of current branch
|
|
|
try:
|
|
|
node = repo.branchtags()[wc.branch()]
|
|
|
except KeyError:
|
|
|
if wc.branch() == "default": # no default branch!
|
|
|
node = repo.lookup("tip") # update to tip
|
|
|
else:
|
|
|
raise util.Abort(_("branch %s not found") % wc.branch())
|
|
|
overwrite = force and not branchmerge
|
|
|
pl = wc.parents()
|
|
|
p1, p2 = pl[0], repo[node]
|
|
|
pa = p1.ancestor(p2)
|
|
|
fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2)
|
|
|
|
|
|
### check phase
|
|
|
if not overwrite and len(pl) > 1:
|
|
|
raise util.Abort(_("outstanding uncommitted merges"))
|
|
|
if branchmerge:
|
|
|
if pa == p2:
|
|
|
raise util.Abort(_("merging with a working directory ancestor"
|
|
|
" has no effect"))
|
|
|
elif pa == p1:
|
|
|
if p1.branch() == p2.branch():
|
|
|
raise util.Abort(_("nothing to merge (use 'hg update'"
|
|
|
" or check 'hg heads')"))
|
|
|
if not force and (wc.files() or wc.deleted()):
|
|
|
raise util.Abort(_("outstanding uncommitted changes "
|
|
|
"(use 'hg status' to list changes)"))
|
|
|
for s in wc.substate:
|
|
|
if wc.sub(s).dirty():
|
|
|
raise util.Abort(_("outstanding uncommitted changes in "
|
|
|
"subrepository '%s'") % s)
|
|
|
|
|
|
elif not overwrite:
|
|
|
if pa == p1 or pa == p2: # linear
|
|
|
pass # all good
|
|
|
elif wc.files() or wc.deleted():
|
|
|
raise util.Abort(_("crosses branches (merge branches or use"
|
|
|
" --clean to discard changes)"))
|
|
|
elif onode is None:
|
|
|
raise util.Abort(_("crosses branches (merge branches or use"
|
|
|
" --check to force update)"))
|
|
|
else:
|
|
|
# Allow jumping branches if clean and specific rev given
|
|
|
overwrite = True
|
|
|
|
|
|
### calculate phase
|
|
|
action = []
|
|
|
wc.status(unknown=True) # prime cache
|
|
|
if not force:
|
|
|
_checkunknown(wc, p2)
|
|
|
if not util.checkcase(repo.path):
|
|
|
_checkcollision(p2)
|
|
|
action += _forgetremoved(wc, p2, branchmerge)
|
|
|
action += manifestmerge(repo, wc, p2, pa, overwrite, partial)
|
|
|
|
|
|
### apply phase
|
|
|
if not branchmerge: # just jump to the new rev
|
|
|
fp1, fp2, xp1, xp2 = fp2, nullid, xp2, ''
|
|
|
if not partial:
|
|
|
repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2)
|
|
|
|
|
|
stats = applyupdates(repo, action, wc, p2, pa, overwrite)
|
|
|
|
|
|
if not partial:
|
|
|
repo.dirstate.setparents(fp1, fp2)
|
|
|
recordupdates(repo, action, branchmerge)
|
|
|
if not branchmerge:
|
|
|
repo.dirstate.setbranch(p2.branch())
|
|
|
finally:
|
|
|
wlock.release()
|
|
|
|
|
|
if not partial:
|
|
|
repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
|
|
|
return stats
|
|
|
|
