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#!/usr/bin/python2
# Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com/>
# This file is part of GlusterFS.
#
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
import sys
import os
import xattr
import uuid
import re
import errno
CHANGELOG_SEARCH_MAX_TRY = 31
DEC_CTIME_START = 5
ROOT_GFID = "00000000-0000-0000-0000-000000000001"
MAX_NUM_CHANGELOGS_TRY = 2
def output_not_found(gfid):
# Write GFID to stderr
sys.stderr.write("%s\n" % gfid)
def output_success(path):
# Write converted Path to Stdout
sys.stdout.write("%s\n" % path)
def full_dir_path(gfid):
out_path = ""
while True:
path = os.path.join(".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:
out_path = os.path.join("./", out_path)
break
gfid = os.path.basename(pgfid)
return out_path
def find_path_from_changelog(fd, gfid):
"""
In given Changelog File, finds using following pattern
<T><GFID>\x00<TYPE>\x00<MODE>\x00<UID>\x00<GID>\x00<PARGFID>/<BASENAME>
Pattern search finds PARGFID and BASENAME, Convert PARGFID to Path
Using readlink and add basename to form Full path.
"""
content = fd.read()
pattern = "E%s" % gfid
pattern += "\x00(3|23)\x00\d+\x00\d+\x00\d+\x00([^\x00]+)/([^\x00]+)"
pat = re.compile(pattern)
match = pat.search(content)
if match:
pgfid = match.group(2)
basename = match.group(3)
if pgfid == ROOT_GFID:
return os.path.join("./", basename)
else:
full_path_parent = full_dir_path(pgfid)
if full_path_parent:
return os.path.join(full_path_parent, basename)
return None
def gfid_to_path(gfid):
"""
Try readlink, if it is directory it succeeds.
Get ctime of the GFID file, Decrement by 5 sec
Search for Changelog filename, Since Changelog file generated
every 15 sec, Search and get immediate next Changelog after the file
Creation. Get the Path by searching in Changelog file.
Get the resultant file's GFID and Compare with the input, If these
GFIDs are different then Some thing is changed(May be Rename)
"""
gfid = gfid.strip()
gpath = os.path.join(".glusterfs", gfid[0:2], gfid[2:4], gfid)
try:
output_success(full_dir_path(gfid))
return
except OSError:
# Not an SymLink
pass
try:
ctime = int(os.stat(gpath).st_ctime)
ctime -= DEC_CTIME_START
except (OSError, IOError):
output_not_found(gfid)
return
path = None
found_changelog = False
changelog_parse_try = 0
for i in range(CHANGELOG_SEARCH_MAX_TRY):
cl = os.path.join(".glusterfs/changelogs", "CHANGELOG.%s" % ctime)
try:
with open(cl, "rb") as f:
changelog_parse_try += 1
found_changelog = True
path = find_path_from_changelog(f, gfid)
if not path and changelog_parse_try < MAX_NUM_CHANGELOGS_TRY:
ctime += 1
continue
break
except (IOError, OSError) as e:
if e.errno == errno.ENOENT:
ctime += 1
else:
break
if not found_changelog:
output_not_found(gfid)
return
if not path:
output_not_found(gfid)
return
gfid1 = str(uuid.UUID(bytes=xattr.get(path, "trusted.gfid")))
if gfid != gfid1:
output_not_found(gfid)
return
output_success(path)
def main():
num_arguments = 3
if not sys.stdin.isatty():
num_arguments = 2
if len(sys.argv) != num_arguments:
sys.stderr.write("Invalid arguments\nUsage: "
"%s <BRICK_PATH> <GFID_FILE>\n" % sys.argv[0])
sys.exit(1)
path = sys.argv[1]
if sys.stdin.isatty():
gfid_list = os.path.abspath(sys.argv[2])
os.chdir(path)
with open(gfid_list) as f:
for gfid in f:
gfid_to_path(gfid)
else:
os.chdir(path)
for gfid in sys.stdin:
gfid_to_path(gfid)
if __name__ == "__main__":
main()
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