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#!/usr/bin/python2.2
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# TODO: move md5sum() and hashdir() to a common place?
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from config import dir, odir, mirrors
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import rfc822, string, md5, gzip, os, re
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from shutil import copyfile
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watch = {}
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tmpdir = ''
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# stolen from sources_to_xml.py
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def treat_sources_file(f, dist):
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"""Scan the given Sources file and treat each Package entry"""
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while 1:
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try:
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m = rfc822.Message(f)
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if len(m) == 0: #eof
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break
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update_watch_info(m, dist)
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except EOFError:
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break
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def update_watch_info(m, dist):
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global watch, tmpdir
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pkg = m['Package']
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ver = m['Version']
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dir = m['Directory']
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diff = ''
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for line in string.split(m['Files'], "\n"):
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line = line.strip()
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if line[-8:] == ".diff.gz":
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diff = line.split()[2]
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md5sum = line.split()[0]
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if not watch.has_key(pkg):
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if diff: # don't consider debian native packages
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watch[pkg] = (ver, md5sum, dir + '/' + diff)
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else:
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f = os.popen("/usr/bin/dpkg --compare-versions %s gt %s" % (ver, watch[pkg][0]) )
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retval = f.close()
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if retval == 0: # we have found a newer version
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watch[pkg] = (ver, md5sum, dir + '/' + diff)
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def download_diffs():
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"""downloads all diffs"""
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global mirrors, watch, tmpdir
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wgetopts="-q -t2" # at most two tries, and quiet
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watchtxt = open(dir + "/watch.txt", "w+")
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tmpdir = dir + "/diffs"
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if not os.path.exists(tmpdir): os.mkdir(tmpdir)
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sorted = watch.keys()
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sorted.sort()
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for pkg in sorted:
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#print watch[pkg]
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fullpath = tmpdir + '/' + watch[pkg][2] # complete path with diff.gz
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#first create dirs and cleanup old diffs
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if not os.path.exists(os.path.dirname(fullpath)): os.makedirs(os.path.dirname(fullpath))
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for file in os.listdir(os.path.dirname(fullpath)):
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if file == os.path.split(fullpath)[1]: continue
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os.remove(os.path.dirname(fullpath) + '/' + file)
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for mirror in mirrors:
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if os.path.exists(fullpath) and md5sum(fullpath) == watch[pkg][1]: break
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if mirror.startswith("file://"): # we are local
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localpath = mirror[8:] + watch[pkg][2]
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if os.path.exists(localpath) and md5sum(localpath) == watch[pkg][1]: # file is sane
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fullpath = localpath
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break
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elif mirror.startswith("http://") or mirror.startswith("ftp://"): # we are remote
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f = os.popen("/usr/bin/wget %s -O %s %s" % (wgetopts, fullpath, mirror + watch[pkg][2]))
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retval = f.close()
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if retval:
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# print "something weird with wget"
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pass
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else:
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break
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# sanity checks on file should be done here
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has_watch = extract_watch(pkg, fullpath)
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if has_watch:
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watchtxt.write("%s %s\n" % (pkg, watch[pkg][0]))
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watchtxt.flush()
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watchtxt.close()
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#os.popen("rm -rf " + tmpdir)
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def extract_watch(pkg, path):
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"""extract watch from given diff and write it to base/hash/package/watch
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and return 1 if is found"""
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f = gzip.open(path, "r")
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if not f: return 0
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in_watch = 0
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has_watch = 0
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filepath = ''
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for line in f.readlines():
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m = re.search("\+\+\+ \S+/debian/watch", line)
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if m:
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filepath = odir + '/' + hashdir(pkg) + '/' + pkg + '/watch'
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watch_f = open(filepath,'w+')
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in_watch = 1
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has_watch = 1
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continue
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if in_watch:
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if line[0:2] == "@@": continue # diff offset ignored
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if line[0] == "+": line = line[1:] # plus sign stripped
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m = re.search("--- \S+", line)
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if m:
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in_watch = 0
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break # only one debian/watch per diff is possible, no need to continue!
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watch_f.write(line)
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if has_watch: watch_f.close()
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if not has_watch and os.path.exists(filepath): os.remove(filepath) # purge old watch file
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f.close()
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return has_watch
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# some utils
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def md5sum(file):
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"""returns md5sum hash in hex for the given file"""
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f = open(file,"r")
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if not f: return 0
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hash = md5.new()
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for line in f.readlines():
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hash.update(line)
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return hash.hexdigest()
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def hashdir(pkg):
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"""returns the hash for package name used in base/ directory"""
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hash = pkg[0]
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if pkg[0:3] == "lib":
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hash = pkg[0:4]
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return hash
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for comp in ["main", "contrib", "non-free"]:
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# only unstable and experimental to consider
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f = open(dir + "/Sources_unstable_" + comp, "r")
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treat_sources_file(f, "unstable")
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f.close()
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# Experimental
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f = open(dir + "/Sources-experimental_" + comp, "r")
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treat_sources_file(f, "experimental")
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f.close()
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download_diffs()
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