apt_dht/MirrorManager.py

   1
   2 import os
   3
   4 from twisted.python import log
   5 from twisted.internet import defer
   6 from twisted.trial import unittest
   7
   8 from AptPackages import AptPackages
   9
  10 aptpkg_dir='.apt-dht'
  11
  12 class MirrorError(Exception):
  13     """Exception raised when there's a problem with the mirror."""
  14
  15 class MirrorManager:
  16     """Manages all requests for mirror objects."""
  17
  18     def __init__(self, cache_dir):
  19         self.cache_dir = cache_dir
  20         self.apt_caches = {}
  21
  22     def extractPath(self, path):
  23         site, path = path.split('/',1)
  24         if not site:
  25             site, path = path.split('/',1)
  26         path = '/'+path
  27
  28         # Make sure a port is included for consistency
  29         if site.find(':') < 0:
  30             site = site + ":80"
  31
  32         i = max(path.rfind('/dists/'), path.rfind('/pool/'))
  33         if i >= 0:
  34             baseDir = path[:i]
  35             path = path[i:]
  36         else:
  37             # Uh oh, this is not good
  38             log.msg("Couldn't find a good base directory for path: %s" % (site + path))
  39             baseDir = ''
  40             if site in self.apt_caches:
  41                 longest_match = 0
  42                 for base in self.apt_caches[site]:
  43                     base_match = ''
  44                     for dirs in path.split('/'):
  45                         if base.startswith(base_match + '/' + dirs):
  46                             base_match += '/' + dirs
  47                         else:
  48                             break
  49                     if len(base_match) > longest_match:
  50                         longest_match = len(base_match)
  51                         baseDir = base_match
  52             log.msg("Settled on baseDir: %s" % baseDir)
  53
  54         return site, baseDir, path
  55
  56     def init(self, site, baseDir):
  57         if site not in self.apt_caches:
  58             self.apt_caches[site] = {}
  59
  60         if baseDir not in self.apt_caches[site]:
  61             site_cache = os.path.join(self.cache_dir, aptpkg_dir, 'mirrors', site + baseDir.replace('/', '_'))
  62             self.apt_caches[site][baseDir] = AptPackages(site_cache)
  63
  64     def updatedFile(self, path, file_path):
  65         site, baseDir, path = self.extractPath(path)
  66         self.init(site, baseDir)
  67         self.apt_caches[site][baseDir].file_updated(path, file_path)
  68
  69     def findHash(self, path):
  70         site, baseDir, path = self.extractPath(path)
  71         if site in self.apt_caches and baseDir in self.apt_caches[site]:
  72             return self.apt_caches[site][baseDir].findHash(path)
  73         d = defer.Deferred()
  74         d.errback(MirrorError("Site Not Found"))
  75         return d
  76
  77 class TestMirrorManager(unittest.TestCase):
  78     """Unit tests for the mirror manager."""
  79
  80     timeout = 20
  81     pending_calls = []
  82     client = None
  83
  84     def setUp(self):
  85         self.client = MirrorManager('/tmp')
  86
  87     def test_extractPath(self):
  88         site, baseDir, path = self.client.extractPath('/ftp.us.debian.org/debian/dists/unstable/Release')
  89         self.failUnless(site == "ftp.us.debian.org:80", "no match: %s" % site)
  90         self.failUnless(baseDir == "/debian", "no match: %s" % baseDir)
  91         self.failUnless(path == "/dists/unstable/Release", "no match: %s" % path)
  92
  93         site, baseDir, path = self.client.extractPath('/ftp.us.debian.org:16999/debian/pool/d/dpkg/dpkg_1.2.1-1.tar.gz')
  94         self.failUnless(site == "ftp.us.debian.org:16999", "no match: %s" % site)
  95         self.failUnless(baseDir == "/debian", "no match: %s" % baseDir)
  96         self.failUnless(path == "/pool/d/dpkg/dpkg_1.2.1-1.tar.gz", "no match: %s" % path)
  97
  98     def verifyHash(self, found_hash, path, true_hash):
  99         self.failUnless(found_hash[0] == true_hash,
 100                     "%s hashes don't match: %s != %s" % (path, found_hash[0], true_hash))
 101
 102     def test_findHash(self):
 103         self.packagesFile = os.popen('ls -Sr /var/lib/apt/lists/ | grep -E "_main_.*Packages$" | tail -n 1').read().rstrip('\n')
 104         self.sourcesFile = os.popen('ls -Sr /var/lib/apt/lists/ | grep -E "_main_.*Sources$" | tail -n 1').read().rstrip('\n')
 105         for f in os.walk('/var/lib/apt/lists').next()[2]:
 106             if f[-7:] == "Release" and self.packagesFile.startswith(f[:-7]):
 107                 self.releaseFile = f
 108                 break
 109
 110         self.client.updatedFile('/' + self.releaseFile.replace('_','/'),
 111                                 '/var/lib/apt/lists/' + self.releaseFile)
 112         self.client.updatedFile('/' + self.releaseFile[:self.releaseFile.find('_dists_')+1].replace('_','/') +
 113                                 self.packagesFile[self.packagesFile.find('_dists_')+1:].replace('_','/'),
 114                                 '/var/lib/apt/lists/' + self.packagesFile)
 115         self.client.updatedFile('/' + self.releaseFile[:self.releaseFile.find('_dists_')+1].replace('_','/') +
 116                                 self.sourcesFile[self.sourcesFile.find('_dists_')+1:].replace('_','/'),
 117                                 '/var/lib/apt/lists/' + self.sourcesFile)
 118
 119         lastDefer = defer.Deferred()
 120
 121         idx_hash = os.popen('grep -A 3000 -E "^SHA1:" ' +
 122                             '/var/lib/apt/lists/' + self.releaseFile +
 123                             ' | grep -E " main/binary-i386/Packages.bz2$"'
 124                             ' | head -n 1 | cut -d\  -f 2').read().rstrip('\n')
 125         idx_path = '/' + self.releaseFile.replace('_','/')[:-7] + 'main/binary-i386/Packages.bz2'
 126
 127         d = self.client.findHash(idx_path)
 128         d.addCallback(self.verifyHash, idx_path, idx_hash)
 129
 130         pkg_hash = os.popen('grep -A 30 -E "^Package: dpkg$" ' +
 131                             '/var/lib/apt/lists/' + self.packagesFile +
 132                             ' | grep -E "^SHA1:" | head -n 1' +
 133                             ' | cut -d\  -f 2').read().rstrip('\n')
 134         pkg_path = '/' + self.releaseFile[:self.releaseFile.find('_dists_')+1].replace('_','/') + \
 135                    os.popen('grep -A 30 -E "^Package: dpkg$" ' +
 136                             '/var/lib/apt/lists/' + self.packagesFile +
 137                             ' | grep -E "^Filename:" | head -n 1' +
 138                             ' | cut -d\  -f 2').read().rstrip('\n')
 139
 140         d = self.client.findHash(pkg_path)
 141         d.addCallback(self.verifyHash, pkg_path, pkg_hash)
 142
 143         src_dir = os.popen('grep -A 30 -E "^Package: dpkg$" ' +
 144                             '/var/lib/apt/lists/' + self.sourcesFile +
 145                             ' | grep -E "^Directory:" | head -n 1' +
 146                             ' | cut -d\  -f 2').read().rstrip('\n')
 147         src_hashes = os.popen('grep -A 20 -E "^Package: dpkg$" ' +
 148                             '/var/lib/apt/lists/' + self.sourcesFile +
 149                             ' | grep -A 4 -E "^Files:" | grep -E "^ " ' +
 150                             ' | cut -d\  -f 2').read().split('\n')[:-1]
 151         src_paths = os.popen('grep -A 20 -E "^Package: dpkg$" ' +
 152                             '/var/lib/apt/lists/' + self.sourcesFile +
 153                             ' | grep -A 4 -E "^Files:" | grep -E "^ " ' +
 154                             ' | cut -d\  -f 4').read().split('\n')[:-1]
 155
 156         for i in range(len(src_hashes)):
 157             src_path = '/' + self.releaseFile[:self.releaseFile.find('_dists_')+1].replace('_','/') + src_dir + '/' + src_paths[i]
 158             d = self.client.findHash(src_path)
 159             d.addCallback(self.verifyHash, src_path, src_hashes[i])
 160
 161         idx_hash = os.popen('grep -A 3000 -E "^SHA1:" ' +
 162                             '/var/lib/apt/lists/' + self.releaseFile +
 163                             ' | grep -E " main/source/Sources.bz2$"'
 164                             ' | head -n 1 | cut -d\  -f 2').read().rstrip('\n')
 165         idx_path = '/' + self.releaseFile.replace('_','/')[:-7] + 'main/source/Sources.bz2'
 166
 167         d = self.client.findHash(idx_path)
 168         d.addCallback(self.verifyHash, idx_path, idx_hash)
 169
 170         d.addBoth(lastDefer.callback)
 171         return lastDefer
 172
 173     def tearDown(self):
 174         for p in self.pending_calls:
 175             if p.active():
 176                 p.cancel()
 177         self.client = None
 178