def fast_process(self, index, diff_rorp): """Patch base_rp with diff_rorp and write increment (neither is dir)""" mirror_rp, inc_prefix = longname.get_mirror_inc_rps( self.CCPP.get_rorps(index), self.basis_root_rp, self.inc_root_rp) tf = TempFile.new(mirror_rp) if self.patch_to_temp(mirror_rp, diff_rorp, tf): inc = robust.check_common_error(self.error_handler, increment.Increment, (tf, mirror_rp, inc_prefix)) if inc is not None and not isinstance(inc, int): self.CCPP.set_inc(index, inc) if inc.isreg(): inc.fsync_with_dir() # Write inc before rp changed if tf.lstat(): if robust.check_common_error(self.error_handler, rpath.rename, (tf, mirror_rp)) is None: self.CCPP.flag_success(index) else: tf.delete() elif mirror_rp.lstat(): mirror_rp.delete() self.CCPP.flag_deleted(index) elif inc.renamed: self.CCPP.flag_deleted(index) return # normal return, otherwise error occurred tf.setdata() if tf.lstat(): tf.delete()
def fast_process(self, index, diff_rorp):
"""Patch base_rp with diff_rorp and write increment (neither is dir)"""
mirror_rp, inc_prefix = longname.get_mirror_inc_rps(
self.CCPP.get_rorps(index), self.basis_root_rp, self.inc_root_rp)
tf = TempFile.new(mirror_rp)
if self.patch_to_temp(mirror_rp, diff_rorp, tf):
inc = robust.check_common_error(self.error_handler,
increment.Increment,
(tf, mirror_rp, inc_prefix))
if inc is not None and not isinstance(inc, int):
self.CCPP.set_inc(index, inc)
if inc.isreg():
inc.fsync_with_dir() # Write inc before rp changed
if tf.lstat():
if robust.check_common_error(self.error_handler,
rpath.rename,
(tf, mirror_rp)) is None:
self.CCPP.flag_success(index)
else:
tf.delete()
elif mirror_rp.lstat():
mirror_rp.delete()
self.CCPP.flag_deleted(index)
return # normal return, otherwise error occurred
tf.setdata()
if tf.lstat(): tf.delete()
def set_dir_replacement(self, diff_rorp, base_rp): """Set self.dir_replacement, which holds data until done with dir This is used when base_rp is a dir, and diff_rorp is not. Returns 1 for success or 0 for failure """ assert diff_rorp.get_attached_filetype() == 'snapshot' self.dir_replacement = TempFile.new(base_rp) if not self.patch_to_temp(None, diff_rorp, self.dir_replacement): if self.dir_replacement.lstat(): self.dir_replacement.delete() # Was an error, so now restore original directory rpath.copy_with_attribs(self.CCPP.get_mirror_rorp(diff_rorp.index), self.dir_replacement) return 0 else: return 1
def fast_process(self, index, diff_rorp): """Patch base_rp with diff_rorp (case where neither is directory)""" mirror_rp, discard = longname.get_mirror_inc_rps( self.CCPP.get_rorps(index), self.basis_root_rp) assert not mirror_rp.isdir(), mirror_rp tf = TempFile.new(mirror_rp) if self.patch_to_temp(mirror_rp, diff_rorp, tf): if tf.lstat(): if robust.check_common_error(self.error_handler, rpath.rename, (tf, mirror_rp)) is None: self.CCPP.flag_success(index) else: tf.delete() elif mirror_rp and mirror_rp.lstat(): mirror_rp.delete() self.CCPP.flag_deleted(index) else: tf.setdata() if tf.lstat(): tf.delete()
def restore_orig_regfile(self, rf): """Restore original regular file This is the trickiest case for avoiding information loss, because we don't want to delete the increment before the mirror is fully written. """ assert rf.metadata_rorp.isreg() if rf.mirror_rp.isreg(): tf = TempFile.new(rf.mirror_rp) tf.write_from_fileobj(rf.get_restore_fp()) tf.fsync_with_dir() # make sure tf fully written before move rpath.copy_attribs(rf.metadata_rorp, tf) rpath.rename(tf, rf.mirror_rp) # move is atomic else: if rf.mirror_rp.lstat(): rf.mirror_rp.delete() rf.mirror_rp.write_from_fileobj(rf.get_restore_fp()) rpath.copy_attribs(rf.metadata_rorp, rf.mirror_rp) if Globals.fsync_directories: rf.mirror_rp.get_parent_rp().fsync() # force move before inc delete
def restore_orig_regfile(self, rf):
"""Restore original regular file
This is the trickiest case for avoiding information loss,
because we don't want to delete the increment before the
mirror is fully written.
"""
assert rf.metadata_rorp.isreg()
if rf.mirror_rp.isreg():
tf = TempFile.new(rf.mirror_rp)
tf.write_from_fileobj(rf.get_restore_fp())
tf.fsync_with_dir() # make sure tf fully written before move
rpath.copy_attribs(rf.metadata_rorp, tf)
rpath.rename(tf, rf.mirror_rp) # move is atomic
else:
if rf.mirror_rp.lstat(): rf.mirror_rp.delete()
rf.mirror_rp.write_from_fileobj(rf.get_restore_fp())
rpath.copy_attribs(rf.metadata_rorp, rf.mirror_rp)
if Globals.fsync_directories:
rf.mirror_rp.get_parent_rp().fsync(
) # force move before inc delete
def write_via_tempfile(fp, rp): """Write fileobj fp to rp by writing to tempfile and renaming""" tf = TempFile.new(rp) retval = tf.write_from_fileobj(fp) rpath.rename(tf, rp) return retval