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metastore stores or restores metadata (owner, group, permissions, xattrs
and optionally mtime) for a filesystem tree.
See the manpage (metastore.1) for more details.
The file format of the .metastore files is as follows:
Data types
----------
CSTRING = NULL-terminated binary string
BSTRING(N) = binary string of length N
INT(N) = N byte integer in big endian byte order
File format
-----------
HEADER
N * ENTRY
HEADER format
-------------
BSTRING(10) - Magic header - "MeTaSt00r3"
BSTRING(8) - Version - "\0\0\0\0\0\0\0\0" (currently)
ENTRY format
------------
CSTRING - Path (absolute or relative)
CSTRING - Owner (owner name, not uid)
CSTRING - Group (group name, not gid)
INT(8) - Mtime (seconds)
INT(8) - Mtime (nanoseconds)
INT(2) - Mode (st_mode from struct stat st_mode AND 0177777,
i.e. unix permissions and type of file)
INT(4) - num_xattrs
FOR (i = 0; i < num_xattrs; i++) {
CSTRING - xattr name
INT(4) - xattrlen
BSTRING(xattrlen) - xattr value
}
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