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execfile("selection.py")
#######################################################################
#
# increment - Provides Inc class, which writes increment files
#
# This code is what writes files ending in .diff, .snapshot, etc.
#
class Inc:
"""Class containing increment functions"""
def Increment_action(new, mirror, incpref):
"""Main file incrementing function, returns RobustAction
new is the file on the active partition,
mirror is the mirrored file from the last backup,
incpref is the prefix of the increment file.
This function basically moves mirror -> incpref.
"""
if not (new and new.lstat() or mirror.lstat()):
return Robust.null_action # Files deleted in meantime, do nothing
Log("Incrementing mirror file " + mirror.path, 5)
if ((new and new.isdir()) or mirror.isdir()) and not incpref.isdir():
incpref.mkdir()
if not mirror.lstat(): return Inc.makemissing_action(incpref)
elif mirror.isdir(): return Inc.makedir_action(mirror, incpref)
elif new.isreg() and mirror.isreg():
return Inc.makediff_action(new, mirror, incpref)
else: return Inc.makesnapshot_action(mirror, incpref)
def Increment(new, mirror, incpref):
Inc.Increment_action(new, mirror, incpref).execute()
def makemissing_action(incpref):
"""Signify that mirror file was missing"""
return RobustAction(lambda: None,
Inc.get_inc_ext(incpref, "missing").touch,
lambda exp: None)
def makesnapshot_action(mirror, incpref):
"""Copy mirror to incfile, since new is quite different"""
if (mirror.isreg() and Globals.compression and
not Globals.no_compression_regexp.match(mirror.path)):
snapshotrp = Inc.get_inc_ext(incpref, "snapshot.gz")
return Robust.copy_with_attribs_action(mirror, snapshotrp, 1)
else:
snapshotrp = Inc.get_inc_ext(incpref, "snapshot")
return Robust.copy_with_attribs_action(mirror, snapshotrp, None)
def makediff_action(new, mirror, incpref):
"""Make incfile which is a diff new -> mirror"""
if (Globals.compression and
not Globals.no_compression_regexp.match(mirror.path)):
diff = Inc.get_inc_ext(incpref, "diff.gz")
return Robust.chain([Rdiff.write_delta_action(new, mirror,
diff, 1),
Robust.copy_attribs_action(mirror, diff)])
else:
diff = Inc.get_inc_ext(incpref, "diff")
return Robust.chain([Rdiff.write_delta_action(new, mirror,
diff, None),
Robust.copy_attribs_action(mirror, diff)])
def makedir_action(mirrordir, incpref):
"""Make file indicating directory mirrordir has changed"""
dirsign = Inc.get_inc_ext(incpref, "dir")
def final():
dirsign.touch()
RPath.copy_attribs(mirrordir, dirsign)
return RobustAction(lambda: None, final, dirsign.delete)
def get_inc_ext(rp, typestr):
"""Return RPath/DSRPath like rp but with inc/time extension
If the file exists, then probably a previous backup has been
aborted. We then keep asking FindTime to get a time later
than the one that already has an inc file.
"""
def get_newinc(timestr):
"""Get new increment rp with given time suffix"""
addtostr = lambda s: "%s.%s.%s" % (s, timestr, typestr)
if rp.index:
return rp.__class__(rp.conn, rp.base, rp.index[:-1] +
(addtostr(rp.index[-1]),))
else: return rp.__class__(rp.conn, addtostr(rp.base), rp.index)
inctime = 0
while 1:
inctime = Resume.FindTime(rp.index, inctime)
incrp = get_newinc(Time.timetostring(inctime))
if not incrp.lstat(): return incrp
MakeStatic(Inc)
class IncrementITR(IterTreeReducer):
"""Patch and increment iterator of increment triples
This has to be an ITR because directories that have files in them
changed are flagged with an increment marker. There are four
possibilities as to the order:
1. Normal file -> Normal file: right away
2. Directory -> Directory: wait until files in the directory
are processed, as we won't know whether to add a marker
until the end.
3. Normal file -> Directory: right away, so later files will
have a directory to go into.
4. Directory -> Normal file: Wait until the end, so we can
process all the files in the directory.
Remember this object needs to be pickable.
"""
directory, directory_replacement = None, None
changed = None
def __init__(self, inc_rpath):
"""Set inc_rpath, an rpath of the base of the tree"""
self.inc_rpath = inc_rpath
IterTreeReducer.__init__(inc_rpath)
def start_process(self, index, diff_rorp, dsrp):
"""Initial processing of file
diff_rorp is the RORPath of the diff from the remote side, and
dsrp is the local file to be incremented
"""
incpref = self.inc_rpath.new_index(index)
if dsrp.isdir():
self.init_dir(dsrp, diff_rorp, incpref)
self.setvals(diff_rorp, dsrp, incpref)
else: self.init_non_dir(dsrp, diff_rorp, incpref)
def setvals(self, diff_rorp, dsrp, incpref):
"""Record given values in state dict since in directory
We don't do these earlier in case of a problem inside the
init_* functions. Index isn't given because it is done by the
superclass.
"""
self.directory = 1
self.diff_rorp = diff_rorp
self.dsrp = dsrp
self.incpref = incpref
def init_dir(self, dsrp, diff_rorp, incpref):
"""Process a directory (initial pass)
If the directory is changing into a normal file, we need to
save the normal file data in a temp file, and then create the
real file once we are done with everything inside the
directory.
"""
if not (incpref.lstat() and incpref.isdir()): incpref.mkdir()
if diff_rorp and diff_rorp.isreg() and diff_rorp.file:
tf = TempFileManager(dsrp)
RPathStatic.copy_with_attribs(diff_rorp, tf)
tf.set_attached_filetype(diff_rorp.get_attached_filetype())
self.directory_replacement = tf
def init_non_dir(self, dsrp, diff_rorp, incpref):
"""Process a non directory file (initial pass)"""
if not diff_rorp: return # no diff, so no change necessary
if diff_rorp.isreg and (dsrp.isreg() or diff_rorp.isflaglinked()):
tf = TempFileManager.new(dsrp)
def init_thunk():
if diff_rorp.isflaglinked():
Hardlink.link_rp(diff_rorp, tf, dsrp)
else: Rdiff.patch_with_attribs_action(dsrp, diff_rorp,
tf).execute()
Inc.Increment_action(tf, dsrp, incpref).execute()
Robust.make_tf_robustaction(init_thunk, (tf,), (dsrp,)).execute()
else:
Robust.chain([Inc.Increment_action(diff_rorp, dsrp, incref),
RORPIter.patchonce_action(none, dsrp, diff_rorp)]
).execute()
self.changed = 1
def end_process(self):
"""Do final work when leaving a tree (directory)"""
if not self.directory: return
diff_rorp, dsrp, incpref = self.diff_rorp, self.dsrp, self.incpref
if not diff_rorp and not self.changed: return
if self.directory_replacement:
tf = self.directory_replacement
Inc.Increment(tf, dsrp, incpref)
RORPIter.patchonce_action(None, dsrp, tf).execute()
tf.delete()
else:
Inc.Increment(diff_rorp, dsrp, incpref)
if diff_rorp:
RORPIter.patchonce_action(None, dsrp, diff_rorp).execute()
def branch_process(self, subinstance):
"""Update the has_changed flag if change in branch"""
if subinstance.changed: self.changed = 1
def make_patch_increment_ITR(inc_rpath, initial_state = None):
"""Return IterTreeReducer that patches and increments"""
def base_init(indexed_tuple):
"""Patch if appropriate, return (a,b) tuple
a is true if found directory and thus didn't take action
if a is false, b is true if some changes were made
if a is true, b is the rp of a temporary file used to hold
the diff_rorp's data (for dir -> normal file change), and
false if none was necessary.
"""
diff_rorp, dsrp = indexed_tuple
incpref = inc_rpath.new_index(indexed_tuple.index)
if dsrp.isdir(): return init_dir(dsrp, diff_rorp, incpref)
else: return init_non_dir(dsrp, diff_rorp, incpref)
def init_dir(dsrp, diff_rorp, incpref):
"""Initial processing of a directory
Make the corresponding directory right away, but wait
until the end to write the replacement. However, if the
diff_rorp contains data, we must write it locally before
continuing, or else that data will be lost in the stream.
"""
if not (incpref.lstat() and incpref.isdir()): incpref.mkdir()
if diff_rorp and diff_rorp.isreg() and diff_rorp.file:
tf = TempFileManager.new(dsrp)
RPathStatic.copy_with_attribs(diff_rorp, tf)
tf.set_attached_filetype(diff_rorp.get_attached_filetype())
return (1, tf)
else: return (1, None)
def init_non_dir(dsrp, diff_rorp, incpref):
"""Initial processing of non-directory
If a reverse diff is called for it is generated by apply
the forwards diff first on a temporary file.
"""
if diff_rorp:
if diff_rorp.isreg() and (dsrp.isreg() or
diff_rorp.isflaglinked()):
tf = TempFileManager.new(dsrp)
def init_thunk():
if diff_rorp.isflaglinked():
Hardlink.link_rp(diff_rorp, tf, dsrp)
else: Rdiff.patch_with_attribs_action(dsrp, diff_rorp,
tf).execute()
Inc.Increment_action(tf, dsrp, incpref).execute()
Robust.make_tf_robustaction(init_thunk, (tf,),
(dsrp,)).execute()
else:
Robust.chain([Inc.Increment_action(diff_rorp, dsrp,
incpref),
RORPIter.patchonce_action(
None, dsrp, diff_rorp)]).execute()
return (None, 1)
return (None, None)
def base_final(base_tuple, base_init_tuple, changed):
"""Patch directory if not done, return true iff made change"""
if base_init_tuple[0]: # was directory
diff_rorp, dsrp = base_tuple
if changed or diff_rorp:
if base_init_tuple[1]: diff_rorp = base_init_tuple[1]
Inc.Increment(diff_rorp, dsrp,
inc_rpath.new_index(base_tuple.index))
if diff_rorp:
RORPIter.patchonce_action(None, dsrp,
diff_rorp).execute()
if isinstance(diff_rorp, TempFile): diff_rorp.delete()
return 1
return None
else: # changed iff base_init_tuple says it was
return base_init_tuple[1]
return IterTreeReducer(base_init, lambda x,y: x or y, None,
base_final, initial_state)
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