mail.py

   1 import sys
   2 import re
   3 import time
   4 import mailbox
   5 import email.Iterators
   6 import email.Parser
   7 import email.utils
   8 import sqlalchemy
   9
  10 import db
  11 import patch
  12 from git import git
  13
  14 _msg_id_regex = re.compile(r'<([^<>]+)>')
  15 def _parse_msg_id(str):
  16     return _msg_id_regex.search(str).group(1)
  17
  18 parser = email.Parser.Parser()
  19
  20 def _detect_reply_id(msg):
  21     if msg['In-Reply-To']:
  22         return _parse_msg_id(msg['In-Reply-To'])
  23     if msg['References']:
  24         refs = ' '.join(msg.get_all('References'))
  25         ref_ids = [m.group(1) for m in _msg_id_regex.finditer(refs)]
  26         return ref_ids[-1]
  27
  28 def _get_text_payload(msg):
  29     if not msg.is_multipart():
  30         return msg.get_payload()
  31     textpart = max(email.Iterators.typed_subpart_iterator(msg), key=len)
  32     if textpart.is_multipart():
  33         return textpart.get_payload(0)
  34     else:
  35         return textpart.get_payload()
  36
  37 _format_patch_regex = re.compile('.*^---$.*^diff --git', re.MULTILINE|re.DOTALL)
  38 _snip_patch_regex = re.compile('.*^-+ ?(?:8<|>8) ?-+\n(.*^diff --git.*)',
  39                                re.MULTILINE|re.DOTALL)
  40 def _guess_patch_contents(msg):
  41     p = _get_text_payload(msg)
  42     if _format_patch_regex.match(p):
  43         msg.set_payload(p)
  44         return msg.as_string()
  45     m = _snip_patch_regex.match(p)
  46     if m:
  47         msg.set_payload(m.group(1))
  48         return msg.as_string()
  49     # no patch found
  50     return None
  51
  52
  53 def later_unapplied_patches(session, msg):
  54     return (session.query(Mail)
  55             .filter(Mail.has_patch==True)
  56             .filter(sqlalchemy.in_(msg.message_id, Mail.references))
  57             .all())
  58
  59
  60 def try_patch(session, m, pp, commit):
  61     git('checkout', commit.sha1)
  62     try:
  63         pp.apply()
  64     except patch.PatchError:
  65         return # failed
  66     pipe = git('show', ret_pipe=True)
  67     output = git('patch-id', input_pipe=pipe)[0]
  68     if not output:
  69         # this means the patch had no diff; e.g., a mode change
  70         return
  71     patch_id, commit_id = output.split()
  72     c = session.query(db.Commit).filter(db.Commit.sha1 == commit_id).first()
  73     if not c:
  74         output = git('log', '-1', '--pretty=format:%ct %at')[0]
  75         adate, cdate = [int(s) for s in output.split()]
  76         c = db.Commit(commit_id, cdate, adate, patch_id, False)
  77         session.add(c)
  78     p = db.Patch(c, m.id, pp.notes)
  79     session.add(p)
  80     return p
  81
  82 def try_patch_anywhere(session, msg, m):
  83     pdata = _guess_patch_contents(msg)
  84     if not pdata:
  85         return
  86     pp = patch.Patch(pdata)
  87     # first try on the commit given by the blobs
  88     commits = []
  89     for prefix in pp.blobs_pre:
  90         ret = (session.query(db.Blob, db.Commit)
  91                .filter(db.Blob.newest_commit_sha1 == db.Commit.sha1)
  92                .filter(db.Blob.sha1.like(prefix+'%'))
  93                .filter(db.Commit.upstream == True)
  94                .order_by(db.Commit.cdate.desc()).first())
  95         if not ret:
  96             print 'blob %s not found?!' % prefix
  97             break
  98         commits.append(ret[1])
  99     else:
 100         if commits:
 101             # all blobs found
 102             cmt = min(commits)
 103             print 'trying canonical commit %s' % cmt.sha1
 104             applied = try_patch(session, m, pp, cmt)
 105             if applied:
 106                 return applied
 107             # this is just hopeless: it doesn't apply to the commit it should!
 108             return
 109         else:
 110             print "no canonical commit found"
 111     # if we have a parent, try on the parent
 112     parent = session.query(db.Mail).filter(db.Mail.message_id==m.in_reply_to).first()
 113     if parent and parent.has_patch and parent.patch_id:
 114         cmt = (session.query(db.Commit)
 115                .filter(db.Commit.patch_id==parent.patch_id)
 116                .order_by(db.Commit.cdate.desc()).first())
 117         print 'trying to apply on parent %s' % cmt.sha1
 118         applied = try_patch(session, m, pp, cmt)
 119         if applied:
 120             return applied
 121     else:
 122         print "no parent commit found"
 123     # try on origin/master
 124     print 'trying on origin/master'
 125     master = git('rev-parse', 'origin/master')[0].strip()
 126     cmt = session.query(db.Commit).filter(db.Commit.sha1==master).one()
 127     applied = try_patch(session, m, pp, cmt)
 128     if applied:
 129         return applied
 130     # same for origin/next
 131     print 'trying on origin/next'
 132     next = git('rev-parse', 'origin/next')[0].strip()
 133     cmt = session.query(db.Commit).filter(db.Commit.sha1==next).one()
 134     applied = try_patch(session, m, pp, cmt)
 135     if applied:
 136         return applied
 137     # all out of ideas!
 138
 139 def parse_mail(session, msg):
 140     if (session.query(db.Mail.message_id)
 141         .filter(db.Mail.message_id == _parse_msg_id(msg['Message-Id']))
 142         .first()):
 143         return [] # already exists
 144     m = db.Mail()
 145     m.message_id = _parse_msg_id(msg['Message-Id'])
 146     m.author = msg['From']
 147     m.in_reply_to = _detect_reply_id(msg)
 148     m.post_date = time.mktime(email.utils.parsedate(msg['Date']))
 149     m.payload = msg.as_string()
 150     m.has_patch = bool(_guess_patch_contents(msg))
 151     session.add(m)
 152     references = []
 153     if msg['References']:
 154         for im in _msg_id_regex.finditer(' '.join(msg.get_all('References'))):
 155             references.append((m, im.group(1)))
 156     patch = try_patch_anywhere(session, msg, m)
 157     if patch:
 158         m.patch_id = patch.commit.patch_id
 159     session.commit()
 160     return references
 161
 162 def parse_mbox(fname):
 163     session = db.Session()
 164     mbox = mailbox.mbox(fname, parser.parse)
 165     mbox_parsed = list(mbox)
 166     references = []
 167     for msg in mbox_parsed:
 168         references.extend(parse_mail(session, msg))
 169     session.commit()
 170     for m, r in references:
 171         session.add(db.Reference(m.id, r))
 172     session.commit()
 173
 174 if __name__ == '__main__':
 175     for mbox in sys.argv[1:]:
 176         parse_mbox(mbox)