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#!/usr/bin/env python
"""
# OpenWRT download directory cleanup utility.
# Delete all but the very last version of the program tarballs.
#
# Copyright (c) 2010 Michael Buesch <mb@bu3sch.de>
"""

import sys
import os
import re
import getopt

# Commandline options
opt_dryrun = False


def parseVer_1234(match, filepath):
progname = match.group(1)
progversion = (int(match.group(2)) << 64) |\
(int(match.group(3)) << 48) |\
(int(match.group(4)) << 32) |\
(int(match.group(5)) << 16)
return (progname, progversion)

def parseVer_123(match, filepath):
progname = match.group(1)
try:
patchlevel = match.group(5)
except (IndexError), e:
patchlevel = None
if patchlevel:
patchlevel = ord(patchlevel[0])
else:
patchlevel = 0
progversion = (int(match.group(2)) << 64) |\
(int(match.group(3)) << 48) |\
(int(match.group(4)) << 32) |\
patchlevel
return (progname, progversion)

def parseVer_12(match, filepath):
progname = match.group(1)
try:
patchlevel = match.group(4)
except (IndexError), e:
patchlevel = None
if patchlevel:
patchlevel = ord(patchlevel[0])
else:
patchlevel = 0
progversion = (int(match.group(2)) << 64) |\
(int(match.group(3)) << 48) |\
patchlevel
return (progname, progversion)

def parseVer_r(match, filepath):
progname = match.group(1)
progversion = (int(match.group(2)) << 64)
return (progname, progversion)

def parseVer_ymd(match, filepath):
progname = match.group(1)
progversion = (int(match.group(2)) << 64) |\
(int(match.group(3)) << 48) |\
(int(match.group(4)) << 32)
return (progname, progversion)

def parseVer_GIT(match, filepath):
progname = match.group(1)
st = os.stat(filepath)
progversion = int(st.st_mtime) << 64
return (progname, progversion)

extensions = (
".tar.gz",
".tar.bz2",
".orig.tar.gz",
".orig.tar.bz2",
".zip",
".tgz",
".tbz",
)

versionRegex = (
(re.compile(r"(.+)[-_]([0-9a-fA-F]{40,40})"), parseVer_GIT), # xxx-GIT_SHASUM
(re.compile(r"(.+)[-_](\d+)\.(\d+)\.(\d+)\.(\d+)"), parseVer_1234), # xxx-1.2.3.4
(re.compile(r"(.+)[-_](\d\d\d\d)-?(\d\d)-?(\d\d)"), parseVer_ymd), # xxx-YYYY-MM-DD
(re.compile(r"(.+)[-_](\d+)\.(\d+)\.(\d+)(\w?)"), parseVer_123), # xxx-1.2.3a
(re.compile(r"(.+)[-_](\d+)_(\d+)_(\d+)"), parseVer_123), # xxx-1_2_3
(re.compile(r"(.+)[-_](\d+)\.(\d+)(\w?)"), parseVer_12), # xxx-1.2a
(re.compile(r"(.+)[-_]r?(\d+)"), parseVer_r), # xxx-r1111
)

blacklist = [
("linux", re.compile(r"linux-.*")),
("gcc", re.compile(r"gcc-.*")),
("wl_apsta", re.compile(r"wl_apsta.*")),
(".fw", re.compile(r".*\.fw")),
(".arm", re.compile(r".*\.arm")),
(".bin", re.compile(r".*\.bin")),
("rt-firmware", re.compile(r"RT[\d\w]+_Firmware.*")),
]

class EntryParseError(Exception): pass

class Entry:
def __init__(self, directory, filename):
self.directory = directory
self.filename = filename
self.progname = ""
self.fileext = ""

for ext in extensions:
if filename.endswith(ext):
filename = filename[0:0-len(ext)]
self.fileext = ext
break
else:
print self.filename, "has an unknown file-extension"
raise EntryParseError("ext")
for (regex, parseVersion) in versionRegex:
match = regex.match(filename)
if match:
(self.progname, self.version) = parseVersion(
match, directory + "/" + filename + self.fileext)
break
else:
print self.filename, "has an unknown version pattern"
raise EntryParseError("ver")

def deleteFile(self):
path = (self.directory + "/" + self.filename).replace("//", "/")
print "Deleting", path
if not opt_dryrun:
os.unlink(path)

def __eq__(self, y):
return self.filename == y.filename

def __ge__(self, y):
return self.version >= y.version

def usage():
print "OpenWRT download directory cleanup utility"
print "Usage: " + sys.argv[0] + " [OPTIONS] <path/to/dl>"
print ""
print " -d|--dry-run Do a dry-run. Don't delete any files"
print " -B|--show-blacklist Show the blacklist and exit"
print " -w|--whitelist ITEM Remove ITEM from blacklist"

def main(argv):
global opt_dryrun

try:
(opts, args) = getopt.getopt(argv[1:],
"hdBw:",
[ "help", "dry-run", "show-blacklist", "whitelist=", ])
if len(args) != 1:
usage()
return 1
except getopt.GetoptError:
usage()
return 1
directory = args[0]
for (o, v) in opts:
if o in ("-h", "--help"):
usage()
return 0
if o in ("-d", "--dry-run"):
opt_dryrun = True
if o in ("-w", "--whitelist"):
for i in range(0, len(blacklist)):
(name, regex) = blacklist[i]
if name == v:
del blacklist[i]
break
else:
print "Whitelist error: Item", v,\
"is not in blacklist"
return 1
if o in ("-B", "--show-blacklist"):
for (name, regex) in blacklist:
print name
return 0

# Create a directory listing and parse the file names.
entries = []
for filename in os.listdir(directory):
if filename == "." or filename == "..":
continue
for (name, regex) in blacklist:
if regex.match(filename):
if opt_dryrun:
print filename, "is blacklisted"
break
else:
try:
entries.append(Entry(directory, filename))
except (EntryParseError), e: pass

# Create a map of programs
progmap = {}
for entry in entries:
if entry.progname in progmap.keys():
progmap[entry.progname].append(entry)
else:
progmap[entry.progname] = [entry,]

# Traverse the program map and delete everything but the last version
for prog in progmap:
lastVersion = None
versions = progmap[prog]
for version in versions:
if lastVersion is None or version >= lastVersion:
lastVersion = version
if lastVersion:
for version in versions:
if version != lastVersion:
version.deleteFile()
if opt_dryrun:
print "Keeping", lastVersion.filename

return 0

if __name__ == "__main__":
sys.exit(main(sys.argv))
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