gfid_to_path.py

import xattr
import sys
import os


ROOT_GFID = "00000000-0000-0000-0000-000000000001"
PFX = "user.pgfid"


def symlink_gfid_to_path(brick, gfid):
    """
    Each directories are symlinked to file named GFID
    in .glusterfs directory of brick backend. Using readlink
    we get PARGFID/basename of dir. readlink recursively till
    we get PARGFID as ROOT_GFID.
    """
    if gfid == ROOT_GFID:
        return ""

    out_path = ""
    while True:
        path = os.path.join(brick, ".glusterfs", gfid[0:2], gfid[2:4], gfid)
        path_readlink = os.readlink(path)
        pgfid = os.path.dirname(path_readlink)
        out_path = os.path.join(os.path.basename(path_readlink), out_path)
        if pgfid == "../../00/00/%s" % ROOT_GFID:
            break
        gfid = os.path.basename(pgfid)
    return out_path


def gfid_to_path(brick, gfid):
    backend_path = os.path.join(brick, ".glusterfs", gfid[0:2], gfid[2:4],
                                gfid)
    if os.path.isdir(backend_path):
        print symlink_gfid_to_path(brick, gfid)

    all_xattrs = xattr.list(backend_path, nofollow=True)

    for x in all_xattrs:
        if x.startswith(PFX):
            pgfid = x.split(".")[2]
            pdir = symlink_gfid_to_path(brick, pgfid)
            bn = xattr.get(backend_path, x, nofollow=True)
            print os.path.join(pdir, bn)


if __name__ == "__main__":
    gfid_to_path(sys.argv[1], sys.argv[2])