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#!/usr/bin/env python2
"""cacheclean - a simple python script to clean up the /data/var/cache/pacman/pkg directory.
More versatile than 'pacman -Sc' in that you can select how many old versions
to keep.
Usage: cacheclean {-p} {-v} <# of copies to keep>
# of copies to keep - (required) how many generations of each package to keep
-p - (optional) preview what would be deleted; forces verbose (-v) mode.
-v - (optional) show deleted packages.
Adapted from https://github.com/graysky2/cacheclean for LinHES pacman cache directories
and python 2.6."""
# Note that the determination of package age is done by simply looking at the date-time
# modified stamp on the file. There is just enough variation in the way package version
# is done that I thought this would be simpler & just as good.
# Also note that you must be root to run this script.
import getopt
import os
import re
import sys
# helper function to get tuple of (file dtm, file name, file sz)
def fn_stats(fn):
s = os.stat(fn)
return (s[8], fn, s[6])
# cleanup does the actual pkg file deletion
def cleanup(run_list):
# strictly speaking only the first two of these globals need to be listed.
global n_deleted, bytes_deleted, opt_verbose, opt_preview, n_to_keep
# return if the run_list is too short
#print run_list
#return
if len(run_list) <= n_to_keep: return
# Build list of tuples (date-time file modified, file name, file size)
dtm_list = [fn_stats(tfn) for tfn in run_list]
# Sort the list by date-time
dtm_list.sort()
# Build list of the filenames to delete (all but last n_to_keep).
# <showing_off>
#kill_list = [tfn[1] for tfn in dtm_list[:-n_to_keep]]
#bytes_deleted = sum(x[2] for x in dtm_list[:-n_to_keep])
# </showing_off>
kill_list = []
for x in dtm_list[:-n_to_keep]:
if os.path.isfile(x[1]):
kill_list.append(x[1])
bytes_deleted += x[2]
if opt_verbose and kill_list: print (kill_list)
n_deleted += len(kill_list)
# and finally delete (if not in preview mode)
if not opt_preview:
for dfn in kill_list:
os.unlink(dfn)
######################################################################
# mainline processing
# process command line options
try:
opts, pargs = getopt.getopt(sys.argv[1:], 'vp')
opt_dict = dict(opts)
opt_preview = '-p' in opt_dict
opt_verbose = '-v' in opt_dict
if opt_preview: opt_verbose = True
if len(pargs) == 1:
n_to_keep = pargs[0]
else:
raise getopt.GetoptError("missing required argument.")
try:
n_to_keep = int(n_to_keep)
if n_to_keep <= 0: raise ValueError
except ValueError as e:
raise getopt.GetoptError("# of copies to keep must be numeric > 0!")
except getopt.GetoptError as msg:
print ("Error:",msg,"\n",__doc__)
sys.exit(1)
# change to the pkg directory & get a sorted list of its contents
os.chdir('/data/var/cache/pacman/pkg')
pkg_fns = os.listdir('.')
pkg_fns.sort()
# Pattern to use to extract the package name from the tar file name:
# for pkg e.g. 'gnome-common-2.8.0-1-i686.pkg.tar.gz' group(1) is 'gnome-common'.
bpat = re.compile("""
^([^-/][^/]*?)- # (1) package name
[^-/\s]+- # (2) version
[^-/\s]+ # (3) release
(-i686|-x86_64|-any)? # (4) architecture
\.pkg\.tar # (5) extension
(?:\.(?:gz|bz2|xz|Z))? # (6) compresssion extension
(?:\.aria2|.sig)? # (7) other extension
(?:\.part)?$ # (8) partially-downloaded files' extension
""", re.X)
n_deleted = 0
bytes_deleted = 0
pkg_base_nm = ''
# now look for "runs" of the same package name differing only in version info.
for run_end in range(len(pkg_fns)):
fn = pkg_fns[run_end]
# make sure we skip directories
if os.path.isfile(fn):
mo = bpat.match(fn) # test for a match of the package name pattern
if mo:
# print ("Processing file '" + fn + "' " + str(mo.lastindex), file=sys.stdout)
tbase = mo.group(1) # gets the 'base' package name
# include the architecture in the name if it's present
if mo.group(2) is not None:
tbase += mo.group(2)
# print ('tbase: ' + tbase + ' ' + str(mo.lastindex), file=sys.stdout)
# is it a new base name, i.e. the start of a new run?
if tbase != pkg_base_nm: # if so then process the prior run
if pkg_base_nm != '':
cleanup(pkg_fns[run_start:run_end])
pkg_base_nm = tbase # & setup for the new run
run_start = run_end
else:
print >>sys.stderr, "File '"+fn+"' doesn't match package pattern!"
else:
print >>sys.stdout, "skipping directory '"+fn+"'!"
# catch the final run of the list
run_end += 1
cleanup(pkg_fns[run_start:run_end])
if opt_verbose:
if opt_preview:
print ("Preview mode (no files deleted):"),
print n_deleted,"files deleted,",bytes_deleted/(2**10),"kbytes /",bytes_deleted/(2**20),"MBytes /",bytes_deleted/(2**30), "GBytes."
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