Module: UnionFSProbe
- Defined in:
- lib/fs/MiqFS/modules/UnionFSProbe.rb
Constant Summary collapse
- UNIONFS_SUPER_OFFSET =
1024
- UNIONFS_MAGIC_OFFSET =
52
- UNIONFS_MAGIC_SIZE =
4
- UNIONFS_MAGIC =
0xf15f083d
Class Method Summary collapse
Class Method Details
.probe(dobj) ⇒ Object
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# File 'lib/fs/MiqFS/modules/UnionFSProbe.rb', line 7 def self.probe(dobj) return false unless dobj.kind_of?(MiqDisk) # Assume UnionFS - read magic at offset. dobj.seek(UNIONFS_SUPER_OFFSET + UNIONFS_MAGIC_OFFSET) magic = dobj.read(UNIONFS_MAGIC_SIZE)&.unpack('L') raise "UnionFS is Not Supported" if magic == UNIONFS_MAGIC # No UnionFS. false end |