checknlink: return False if .hgtmp file preexists (issue2517)
If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.
So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.
# Copyright 2007 Bryan O'Sullivan <bos@serpentine.com>
# Copyright 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import shlex
from mercurial.i18n import _
from mercurial import util
from common import SKIPREV, converter_source
def rpairs(name):
e = len(name)
while e != -1:
yield name[:e], name[e + 1:]
e = name.rfind('/', 0, e)
yield '.', name
class filemapper(object):
'''Map and filter filenames when importing.
A name can be mapped to itself, a new name, or None (omit from new
repository).'''
def __init__(self, ui, path=None):
self.ui = ui
self.include = {}
self.exclude = {}
self.rename = {}
if path:
if self.parse(path):
raise util.Abort(_('errors in filemap'))
def parse(self, path):
errs = 0
def check(name, mapping, listname):
if not name:
self.ui.warn(_('%s:%d: path to %s is missing\n') %
(lex.infile, lex.lineno, listname))
return 1
if name in mapping:
self.ui.warn(_('%s:%d: %r already in %s list\n') %
(lex.infile, lex.lineno, name, listname))
return 1
if (name.startswith('/') or
name.endswith('/') or
'//' in name):
self.ui.warn(_('%s:%d: superfluous / in %s %r\n') %
(lex.infile, lex.lineno, listname, name))
return 1
return 0
lex = shlex.shlex(open(path), path, True)
lex.wordchars += '!@#$%^&*()-=+[]{}|;:,./<>?'
cmd = lex.get_token()
while cmd:
if cmd == 'include':
name = lex.get_token()
errs += check(name, self.exclude, 'exclude')
self.include[name] = name
elif cmd == 'exclude':
name = lex.get_token()
errs += check(name, self.include, 'include')
errs += check(name, self.rename, 'rename')
self.exclude[name] = name
elif cmd == 'rename':
src = lex.get_token()
dest = lex.get_token()
errs += check(src, self.exclude, 'exclude')
self.rename[src] = dest
elif cmd == 'source':
errs += self.parse(lex.get_token())
else:
self.ui.warn(_('%s:%d: unknown directive %r\n') %
(lex.infile, lex.lineno, cmd))
errs += 1
cmd = lex.get_token()
return errs
def lookup(self, name, mapping):
for pre, suf in rpairs(name):
try:
return mapping[pre], pre, suf
except KeyError:
pass
return '', name, ''
def __call__(self, name):
if self.include:
inc = self.lookup(name, self.include)[0]
else:
inc = name
if self.exclude:
exc = self.lookup(name, self.exclude)[0]
else:
exc = ''
if (not self.include and exc) or (len(inc) <= len(exc)):
return None
newpre, pre, suf = self.lookup(name, self.rename)
if newpre:
if newpre == '.':
return suf
if suf:
return newpre + '/' + suf
return newpre
return name
def active(self):
return bool(self.include or self.exclude or self.rename)
# This class does two additional things compared to a regular source:
#
# - Filter and rename files. This is mostly wrapped by the filemapper
# class above. We hide the original filename in the revision that is
# returned by getchanges to be able to find things later in getfile.
#
# - Return only revisions that matter for the files we're interested in.
# This involves rewriting the parents of the original revision to
# create a graph that is restricted to those revisions.
#
# This set of revisions includes not only revisions that directly
# touch files we're interested in, but also merges that merge two
# or more interesting revisions.
class filemap_source(converter_source):
def __init__(self, ui, baseconverter, filemap):
super(filemap_source, self).__init__(ui)
self.base = baseconverter
self.filemapper = filemapper(ui, filemap)
self.commits = {}
# if a revision rev has parent p in the original revision graph, then
# rev will have parent self.parentmap[p] in the restricted graph.
self.parentmap = {}
# self.wantedancestors[rev] is the set of all ancestors of rev that
# are in the restricted graph.
self.wantedancestors = {}
self.convertedorder = None
self._rebuilt = False
self.origparents = {}
self.children = {}
self.seenchildren = {}
def before(self):
self.base.before()
def after(self):
self.base.after()
def setrevmap(self, revmap):
# rebuild our state to make things restartable
#
# To avoid calling getcommit for every revision that has already
# been converted, we rebuild only the parentmap, delaying the
# rebuild of wantedancestors until we need it (i.e. until a
# merge).
#
# We assume the order argument lists the revisions in
# topological order, so that we can infer which revisions were
# wanted by previous runs.
self._rebuilt = not revmap
seen = {SKIPREV: SKIPREV}
dummyset = set()
converted = []
for rev in revmap.order:
mapped = revmap[rev]
wanted = mapped not in seen
if wanted:
seen[mapped] = rev
self.parentmap[rev] = rev
else:
self.parentmap[rev] = seen[mapped]
self.wantedancestors[rev] = dummyset
arg = seen[mapped]
if arg == SKIPREV:
arg = None
converted.append((rev, wanted, arg))
self.convertedorder = converted
return self.base.setrevmap(revmap)
def rebuild(self):
if self._rebuilt:
return True
self._rebuilt = True
self.parentmap.clear()
self.wantedancestors.clear()
self.seenchildren.clear()
for rev, wanted, arg in self.convertedorder:
if rev not in self.origparents:
self.origparents[rev] = self.getcommit(rev).parents
if arg is not None:
self.children[arg] = self.children.get(arg, 0) + 1
for rev, wanted, arg in self.convertedorder:
parents = self.origparents[rev]
if wanted:
self.mark_wanted(rev, parents)
else:
self.mark_not_wanted(rev, arg)
self._discard(arg, *parents)
return True
def getheads(self):
return self.base.getheads()
def getcommit(self, rev):
# We want to save a reference to the commit objects to be able
# to rewrite their parents later on.
c = self.commits[rev] = self.base.getcommit(rev)
for p in c.parents:
self.children[p] = self.children.get(p, 0) + 1
return c
def _discard(self, *revs):
for r in revs:
if r is None:
continue
self.seenchildren[r] = self.seenchildren.get(r, 0) + 1
if self.seenchildren[r] == self.children[r]:
del self.wantedancestors[r]
del self.parentmap[r]
del self.seenchildren[r]
if self._rebuilt:
del self.children[r]
def wanted(self, rev, i):
# Return True if we're directly interested in rev.
#
# i is an index selecting one of the parents of rev (if rev
# has no parents, i is None). getchangedfiles will give us
# the list of files that are different in rev and in the parent
# indicated by i. If we're interested in any of these files,
# we're interested in rev.
try:
files = self.base.getchangedfiles(rev, i)
except NotImplementedError:
raise util.Abort(_("source repository doesn't support --filemap"))
for f in files:
if self.filemapper(f):
return True
return False
def mark_not_wanted(self, rev, p):
# Mark rev as not interesting and update data structures.
if p is None:
# A root revision. Use SKIPREV to indicate that it doesn't
# map to any revision in the restricted graph. Put SKIPREV
# in the set of wanted ancestors to simplify code elsewhere
self.parentmap[rev] = SKIPREV
self.wantedancestors[rev] = set((SKIPREV,))
return
# Reuse the data from our parent.
self.parentmap[rev] = self.parentmap[p]
self.wantedancestors[rev] = self.wantedancestors[p]
def mark_wanted(self, rev, parents):
# Mark rev ss wanted and update data structures.
# rev will be in the restricted graph, so children of rev in
# the original graph should still have rev as a parent in the
# restricted graph.
self.parentmap[rev] = rev
# The set of wanted ancestors of rev is the union of the sets
# of wanted ancestors of its parents. Plus rev itself.
wrev = set()
for p in parents:
wrev.update(self.wantedancestors[p])
wrev.add(rev)
self.wantedancestors[rev] = wrev
def getchanges(self, rev):
parents = self.commits[rev].parents
if len(parents) > 1:
self.rebuild()
# To decide whether we're interested in rev we:
#
# - calculate what parents rev will have if it turns out we're
# interested in it. If it's going to have more than 1 parent,
# we're interested in it.
#
# - otherwise, we'll compare it with the single parent we found.
# If any of the files we're interested in is different in the
# the two revisions, we're interested in rev.
# A parent p is interesting if its mapped version (self.parentmap[p]):
# - is not SKIPREV
# - is still not in the list of parents (we don't want duplicates)
# - is not an ancestor of the mapped versions of the other parents
mparents = []
wp = None
for i, p1 in enumerate(parents):
mp1 = self.parentmap[p1]
if mp1 == SKIPREV or mp1 in mparents:
continue
for p2 in parents:
if p1 == p2 or mp1 == self.parentmap[p2]:
continue
if mp1 in self.wantedancestors[p2]:
break
else:
mparents.append(mp1)
wp = i
if wp is None and parents:
wp = 0
self.origparents[rev] = parents
closed = 'close' in self.commits[rev].extra
if len(mparents) < 2 and not closed and not self.wanted(rev, wp):
# We don't want this revision.
# Update our state and tell the convert process to map this
# revision to the same revision its parent as mapped to.
p = None
if parents:
p = parents[wp]
self.mark_not_wanted(rev, p)
self.convertedorder.append((rev, False, p))
self._discard(*parents)
return self.parentmap[rev]
# We want this revision.
# Rewrite the parents of the commit object
self.commits[rev].parents = mparents
self.mark_wanted(rev, parents)
self.convertedorder.append((rev, True, None))
self._discard(*parents)
# Get the real changes and do the filtering/mapping. To be
# able to get the files later on in getfile, we hide the
# original filename in the rev part of the return value.
changes, copies = self.base.getchanges(rev)
newnames = {}
files = []
for f, r in changes:
newf = self.filemapper(f)
if newf:
files.append((newf, (f, r)))
newnames[f] = newf
ncopies = {}
for c in copies:
newc = self.filemapper(c)
if newc:
newsource = self.filemapper(copies[c])
if newsource:
ncopies[newc] = newsource
return files, ncopies
def getfile(self, name, rev):
realname, realrev = rev
return self.base.getfile(realname, realrev)
def gettags(self):
return self.base.gettags()
def hasnativeorder(self):
return self.base.hasnativeorder()
def lookuprev(self, rev):
return self.base.lookuprev(rev)