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