def formatMetadata(cls, meta):
"""
Format metadata string in storage format.
Raises MetadataOverflowError if formatted metadata is too long.
"""
lines = ["%s=%s\n" % (key.strip(), str(value).strip())
for key, value in meta.iteritems()]
lines.append("EOF\n")
data = "".join(lines)
if len(data) > METADATA_SIZE:
raise se.MetadataOverflowError(data)
return data
def __putMetadata(cls, metaId, meta):
vgname, offs = metaId
lines = [
"%s=%s\n" % (key.strip(), str(value).strip())
for key, value in meta.iteritems()
]
lines.append("EOF\n")
metavol = lvm.lvPath(vgname, sd.METADATA)
with fileUtils.DirectFile(metavol, "r+d") as f:
data = "".join(lines)
if len(data) > VOLUME_METASIZE:
raise se.MetadataOverflowError(data)
data += "\0" * (VOLUME_METASIZE - len(data))
f.seek(offs * VOLUME_METASIZE)
f.write(data)
def writelines(self, lines):
lvm.activateLVs(self._vgName, self._lvName)
# Write `metadata' to metadata volume
metaStr = StringIO()
for line in lines:
metaStr.write(line)
metaStr.write("\n")
if metaStr.pos > self._size:
raise se.MetadataOverflowError()
# Clear out previous data - it is a volume, not a file
metaStr.write('\0' * (self._size - metaStr.pos))
data = metaStr.getvalue()
with fileUtils.DirectFile(self.metavol, "r+d") as f:
f.seek(self._offset)
f.write(data)