notify: don't produce errors if a revision is not found

Notify extension has a way to only subscribe to a specific revset, such as
"branch(foo)". Before this patch, when there was no branch with that name, it
would produce a traceback saying "unknown revision: foo". With this patch it
would no longer do that, and instead it'll assume there are no revisions that
match this revset. I think this patch is an improvement in general, but there's
a reason I'm sending it now.

test-notify.t has a test case where it obsoletes the only revision on a branch,
and previously that wouldn't produce any complications, because head
computation wasn't obsolescence-aware. Now if the only revision on a branch is
obsolete, repo should not see that branch at all.

That branch will still be present in branchcache (with an empty list of
revisions) until the next patch.

Differential Revision: https://phab.mercurial-scm.org/D12134

hgext/notify.py

@@ -1,656 +1,659 b''
 # notify.py - email notifications for mercurial
 #
 # Copyright 2006 Vadim Gelfer <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 '''hooks for sending email push notifications
 
 This extension implements hooks to send email notifications when
 changesets are sent from or received by the local repository.
 
 First, enable the extension as explained in :hg:`help extensions`, and
 register the hook you want to run. ``incoming`` and ``changegroup`` hooks
 are run when changesets are received, while ``outgoing`` hooks are for
 changesets sent to another repository::
 
   [hooks]
   # one email for each incoming changeset
   incoming.notify = python:hgext.notify.hook
   # one email for all incoming changesets
   changegroup.notify = python:hgext.notify.hook
 
   # one email for all outgoing changesets
   outgoing.notify = python:hgext.notify.hook
 
 This registers the hooks. To enable notification, subscribers must
 be assigned to repositories. The ``[usersubs]`` section maps multiple
 repositories to a given recipient. The ``[reposubs]`` section maps
 multiple recipients to a single repository::
 
   [usersubs]
   # key is subscriber email, value is a comma-separated list of repo patterns
   user@host = pattern
 
   [reposubs]
   # key is repo pattern, value is a comma-separated list of subscriber emails
   pattern = user@host
 
 A ``pattern`` is a ``glob`` matching the absolute path to a repository,
 optionally combined with a revset expression. A revset expression, if
 present, is separated from the glob by a hash. Example::
 
   [reposubs]
   */widgets#branch(release) = [e-mail]
 
 This sends to ``[e-mail]`` whenever a changeset on the ``release``
 branch triggers a notification in any repository ending in ``widgets``.
 
 In order to place them under direct user management, ``[usersubs]`` and
 ``[reposubs]`` sections may be placed in a separate ``hgrc`` file and
 incorporated by reference::
 
   [notify]
   config = /path/to/subscriptionsfile
 
 Notifications will not be sent until the ``notify.test`` value is set
 to ``False``; see below.
 
 Notifications content can be tweaked with the following configuration entries:
 
 notify.test
   If ``True``, print messages to stdout instead of sending them. Default: True.
 
 notify.sources
   Space-separated list of change sources. Notifications are activated only
   when a changeset's source is in this list. Sources may be:
 
   :``serve``: changesets received via http or ssh
   :``pull``: changesets received via ``hg pull``
   :``unbundle``: changesets received via ``hg unbundle``
   :``push``: changesets sent or received via ``hg push``
   :``bundle``: changesets sent via ``hg unbundle``
 
   Default: serve.
 
 notify.strip
   Number of leading slashes to strip from url paths. By default, notifications
   reference repositories with their absolute path. ``notify.strip`` lets you
   turn them into relative paths. For example, ``notify.strip=3`` will change
   ``/long/path/repository`` into ``repository``. Default: 0.
 
 notify.domain
   Default email domain for sender or recipients with no explicit domain.
   It is also used for the domain part of the ``Message-Id`` when using
   ``notify.messageidseed``.
 
 notify.messageidseed
   Create deterministic ``Message-Id`` headers for the mails based on the seed
   and the revision identifier of the first commit in the changeset.
 
 notify.style
   Style file to use when formatting emails.
 
 notify.template
   Template to use when formatting emails.
 
 notify.incoming
   Template to use when run as an incoming hook, overriding ``notify.template``.
 
 notify.outgoing
   Template to use when run as an outgoing hook, overriding ``notify.template``.
 
 notify.changegroup
   Template to use when running as a changegroup hook, overriding
   ``notify.template``.
 
 notify.maxdiff
   Maximum number of diff lines to include in notification email. Set to 0
   to disable the diff, or -1 to include all of it. Default: 300.
 
 notify.maxdiffstat
   Maximum number of diffstat lines to include in notification email. Set to -1
   to include all of it. Default: -1.
 
 notify.maxsubject
   Maximum number of characters in email's subject line. Default: 67.
 
 notify.diffstat
   Set to True to include a diffstat before diff content. Default: True.
 
 notify.showfunc
   If set, override ``diff.showfunc`` for the diff content. Default: None.
 
 notify.merge
   If True, send notifications for merge changesets. Default: True.
 
 notify.mbox
   If set, append mails to this mbox file instead of sending. Default: None.
 
 notify.fromauthor
   If set, use the committer of the first changeset in a changegroup for
   the "From" field of the notification mail. If not set, take the user
   from the pushing repo.  Default: False.
 
 notify.reply-to-predecessor (EXPERIMENTAL)
   If set and the changeset has a predecessor in the repository, try to thread
   the notification mail with the predecessor. This adds the "In-Reply-To" header
   to the notification mail with a reference to the predecessor with the smallest
   revision number. Mail threads can still be torn, especially when changesets
   are folded.
 
   This option must  be used in combination with ``notify.messageidseed``.
 
 If set, the following entries will also be used to customize the
 notifications:
 
 email.from
   Email ``From`` address to use if none can be found in the generated
   email content.
 
 web.baseurl
   Root repository URL to combine with repository paths when making
   references. See also ``notify.strip``.
 
 '''
 from __future__ import absolute_import
 
 import email.errors as emailerrors
 import email.utils as emailutils
 import fnmatch
 import hashlib
 import socket
 import time
 
 from mercurial.i18n import _
 from mercurial import (
     encoding,
     error,
     logcmdutil,
     mail,
     obsutil,
     patch,
     pycompat,
     registrar,
     util,
 )
 from mercurial.utils import (
     dateutil,
     stringutil,
 )
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = b'ships-with-hg-core'
 
 configtable = {}
 configitem = registrar.configitem(configtable)
 
 configitem(
     b'notify',
     b'changegroup',
     default=None,
 )
 configitem(
     b'notify',
     b'config',
     default=None,
 )
 configitem(
     b'notify',
     b'diffstat',
     default=True,
 )
 configitem(
     b'notify',
     b'domain',
     default=None,
 )
 configitem(
     b'notify',
     b'messageidseed',
     default=None,
 )
 configitem(
     b'notify',
     b'fromauthor',
     default=None,
 )
 configitem(
     b'notify',
     b'incoming',
     default=None,
 )
 configitem(
     b'notify',
     b'maxdiff',
     default=300,
 )
 configitem(
     b'notify',
     b'maxdiffstat',
     default=-1,
 )
 configitem(
     b'notify',
     b'maxsubject',
     default=67,
 )
 configitem(
     b'notify',
     b'mbox',
     default=None,
 )
 configitem(
     b'notify',
     b'merge',
     default=True,
 )
 configitem(
     b'notify',
     b'outgoing',
     default=None,
 )
 configitem(
     b'notify',
     b'reply-to-predecessor',
     default=False,
 )
 configitem(
     b'notify',
     b'sources',
     default=b'serve',
 )
 configitem(
     b'notify',
     b'showfunc',
     default=None,
 )
 configitem(
     b'notify',
     b'strip',
     default=0,
 )
 configitem(
     b'notify',
     b'style',
     default=None,
 )
 configitem(
     b'notify',
     b'template',
     default=None,
 )
 configitem(
     b'notify',
     b'test',
     default=True,
 )
 
 # template for single changeset can include email headers.
 single_template = b'''
 Subject: changeset in {webroot}: {desc|firstline|strip}
 From: {author}
 
 changeset {node|short} in {root}
 details: {baseurl}{webroot}?cmd=changeset;node={node|short}
 description:
 \t{desc|tabindent|strip}
 '''.lstrip()
 
 # template for multiple changesets should not contain email headers,
 # because only first set of headers will be used and result will look
 # strange.
 multiple_template = b'''
 changeset {node|short} in {root}
 details: {baseurl}{webroot}?cmd=changeset;node={node|short}
 summary: {desc|firstline}
 '''
 
 deftemplates = {
     b'changegroup': multiple_template,
 }
 
 
 class notifier(object):
     '''email notification class.'''
 
     def __init__(self, ui, repo, hooktype):
         self.ui = ui
         cfg = self.ui.config(b'notify', b'config')
         if cfg:
             self.ui.readconfig(cfg, sections=[b'usersubs', b'reposubs'])
         self.repo = repo
         self.stripcount = int(self.ui.config(b'notify', b'strip'))
         self.root = self.strip(self.repo.root)
         self.domain = self.ui.config(b'notify', b'domain')
         self.mbox = self.ui.config(b'notify', b'mbox')
         self.test = self.ui.configbool(b'notify', b'test')
         self.charsets = mail._charsets(self.ui)
         self.subs = self.subscribers()
         self.merge = self.ui.configbool(b'notify', b'merge')
         self.showfunc = self.ui.configbool(b'notify', b'showfunc')
         self.messageidseed = self.ui.config(b'notify', b'messageidseed')
         self.reply = self.ui.configbool(b'notify', b'reply-to-predecessor')
 
         if self.reply and not self.messageidseed:
             raise error.Abort(
                 _(
                     b'notify.reply-to-predecessor used without '
                     b'notify.messageidseed'
                 )
             )
 
         if self.showfunc is None:
             self.showfunc = self.ui.configbool(b'diff', b'showfunc')
 
         mapfile = None
         template = self.ui.config(b'notify', hooktype) or self.ui.config(
             b'notify', b'template'
         )
         if not template:
             mapfile = self.ui.config(b'notify', b'style')
         if not mapfile and not template:
             template = deftemplates.get(hooktype) or single_template
         spec = logcmdutil.templatespec(template, mapfile)
         self.t = logcmdutil.changesettemplater(self.ui, self.repo, spec)
 
     def strip(self, path):
         '''strip leading slashes from local path, turn into web-safe path.'''
 
         path = util.pconvert(path)
         count = self.stripcount
         while count > 0:
             c = path.find(b'/')
             if c == -1:
                 break
             path = path[c + 1 :]
             count -= 1
         return path
 
     def fixmail(self, addr):
         '''try to clean up email addresses.'''
 
         addr = stringutil.email(addr.strip())
         if self.domain:
             a = addr.find(b'@localhost')
             if a != -1:
                 addr = addr[:a]
             if b'@' not in addr:
                 return addr + b'@' + self.domain
         return addr
 
     def subscribers(self):
         '''return list of email addresses of subscribers to this repo.'''
         subs = set()
         for user, pats in self.ui.configitems(b'usersubs'):
             for pat in pats.split(b','):
                 if b'#' in pat:
                     pat, revs = pat.split(b'#', 1)
                 else:
                     revs = None
                 if fnmatch.fnmatch(self.repo.root, pat.strip()):
                     subs.add((self.fixmail(user), revs))
         for pat, users in self.ui.configitems(b'reposubs'):
             if b'#' in pat:
                 pat, revs = pat.split(b'#', 1)
             else:
                 revs = None
             if fnmatch.fnmatch(self.repo.root, pat):
                 for user in users.split(b','):
                     subs.add((self.fixmail(user), revs))
         return [
             (mail.addressencode(self.ui, s, self.charsets, self.test), r)
             for s, r in sorted(subs)
         ]
 
     def node(self, ctx, **props):
         '''format one changeset, unless it is a suppressed merge.'''
         if not self.merge and len(ctx.parents()) > 1:
             return False
         self.t.show(
             ctx,
             changes=ctx.changeset(),
             baseurl=self.ui.config(b'web', b'baseurl'),
             root=self.repo.root,
             webroot=self.root,
             **props
         )
         return True
 
     def skipsource(self, source):
         '''true if incoming changes from this source should be skipped.'''
         ok_sources = self.ui.config(b'notify', b'sources').split()
         return source not in ok_sources
 
     def send(self, ctx, count, data):
         '''send message.'''
 
         # Select subscribers by revset
         subs = set()
         for sub, spec in self.subs:
             if spec is None:
                 subs.add(sub)
                 continue
-            revs = self.repo.revs(b'%r and %d:', spec, ctx.rev())
+            try:
+                revs = self.repo.revs(b'%r and %d:', spec, ctx.rev())
+            except error.RepoLookupError:
+                continue
             if len(revs):
                 subs.add(sub)
                 continue
         if len(subs) == 0:
             self.ui.debug(
                 b'notify: no subscribers to selected repo and revset\n'
             )
             return
 
         try:
             msg = mail.parsebytes(data)
         except emailerrors.MessageParseError as inst:
             raise error.Abort(inst)
 
         # store sender and subject
         sender = msg['From']
         subject = msg['Subject']
         if sender is not None:
             sender = mail.headdecode(sender)
         if subject is not None:
             subject = mail.headdecode(subject)
         del msg['From'], msg['Subject']
 
         if not msg.is_multipart():
             # create fresh mime message from scratch
             # (multipart templates must take care of this themselves)
             headers = msg.items()
             payload = msg.get_payload(decode=pycompat.ispy3)
             # for notification prefer readability over data precision
             msg = mail.mimeencode(self.ui, payload, self.charsets, self.test)
             # reinstate custom headers
             for k, v in headers:
                 msg[k] = v
 
         msg['Date'] = encoding.strfromlocal(
             dateutil.datestr(format=b"%a, %d %b %Y %H:%M:%S %1%2")
         )
 
         # try to make subject line exist and be useful
         if not subject:
             if count > 1:
                 subject = _(b'%s: %d new changesets') % (self.root, count)
             else:
                 s = ctx.description().lstrip().split(b'\n', 1)[0].rstrip()
                 subject = b'%s: %s' % (self.root, s)
         maxsubject = int(self.ui.config(b'notify', b'maxsubject'))
         if maxsubject:
             subject = stringutil.ellipsis(subject, maxsubject)
         msg['Subject'] = mail.headencode(
             self.ui, subject, self.charsets, self.test
         )
 
         # try to make message have proper sender
         if not sender:
             sender = self.ui.config(b'email', b'from') or self.ui.username()
         if b'@' not in sender or b'@localhost' in sender:
             sender = self.fixmail(sender)
         msg['From'] = mail.addressencode(
             self.ui, sender, self.charsets, self.test
         )
 
         msg['X-Hg-Notification'] = 'changeset %s' % ctx
         if not msg['Message-Id']:
             msg['Message-Id'] = messageid(ctx, self.domain, self.messageidseed)
         if self.reply:
             unfi = self.repo.unfiltered()
             has_node = unfi.changelog.index.has_node
             predecessors = [
                 unfi[ctx2]
                 for ctx2 in obsutil.allpredecessors(unfi.obsstore, [ctx.node()])
                 if ctx2 != ctx.node() and has_node(ctx2)
             ]
             if predecessors:
                 # There is at least one predecessor, so which to pick?
                 # Ideally, there is a unique root because changesets have
                 # been evolved/rebased one step at a time. In this case,
                 # just picking the oldest known changeset provides a stable
                 # base. It doesn't help when changesets are folded. Any
                 # better solution would require storing more information
                 # in the repository.
                 pred = min(predecessors, key=lambda ctx: ctx.rev())
                 msg['In-Reply-To'] = messageid(
                     pred, self.domain, self.messageidseed
                 )
         msg['To'] = ', '.join(sorted(subs))
 
         msgtext = msg.as_bytes() if pycompat.ispy3 else msg.as_string()
         if self.test:
             self.ui.write(msgtext)
             if not msgtext.endswith(b'\n'):
                 self.ui.write(b'\n')
         else:
             self.ui.status(
                 _(b'notify: sending %d subscribers %d changes\n')
                 % (len(subs), count)
             )
             mail.sendmail(
                 self.ui,
                 emailutils.parseaddr(msg['From'])[1],
                 subs,
                 msgtext,
                 mbox=self.mbox,
             )
 
     def diff(self, ctx, ref=None):
 
         maxdiff = int(self.ui.config(b'notify', b'maxdiff'))
         prev = ctx.p1().node()
         if ref:
             ref = ref.node()
         else:
             ref = ctx.node()
         diffopts = patch.diffallopts(self.ui)
         diffopts.showfunc = self.showfunc
         chunks = patch.diff(self.repo, prev, ref, opts=diffopts)
         difflines = b''.join(chunks).splitlines()
 
         if self.ui.configbool(b'notify', b'diffstat'):
             maxdiffstat = int(self.ui.config(b'notify', b'maxdiffstat'))
             s = patch.diffstat(difflines)
             # s may be nil, don't include the header if it is
             if s:
                 if maxdiffstat >= 0 and s.count(b"\n") > maxdiffstat + 1:
                     s = s.split(b"\n")
                     msg = _(b'\ndiffstat (truncated from %d to %d lines):\n\n')
                     self.ui.write(msg % (len(s) - 2, maxdiffstat))
                     self.ui.write(b"\n".join(s[:maxdiffstat] + s[-2:]))
                 else:
                     self.ui.write(_(b'\ndiffstat:\n\n%s') % s)
 
         if maxdiff == 0:
             return
         elif maxdiff > 0 and len(difflines) > maxdiff:
             msg = _(b'\ndiffs (truncated from %d to %d lines):\n\n')
             self.ui.write(msg % (len(difflines), maxdiff))
             difflines = difflines[:maxdiff]
         elif difflines:
             self.ui.write(_(b'\ndiffs (%d lines):\n\n') % len(difflines))
 
         self.ui.write(b"\n".join(difflines))
 
 
 def hook(ui, repo, hooktype, node=None, source=None, **kwargs):
     """send email notifications to interested subscribers.
 
     if used as changegroup hook, send one email for all changesets in
     changegroup. else send one email per changeset."""
 
     n = notifier(ui, repo, hooktype)
     ctx = repo.unfiltered()[node]
 
     if not n.subs:
         ui.debug(b'notify: no subscribers to repository %s\n' % n.root)
         return
     if n.skipsource(source):
         ui.debug(b'notify: changes have source "%s" - skipping\n' % source)
         return
 
     ui.pushbuffer()
     data = b''
     count = 0
     author = b''
     if hooktype == b'changegroup' or hooktype == b'outgoing':
         for rev in repo.changelog.revs(start=ctx.rev()):
             if n.node(repo[rev]):
                 count += 1
                 if not author:
                     author = repo[rev].user()
             else:
                 data += ui.popbuffer()
                 ui.note(
                     _(b'notify: suppressing notification for merge %d:%s\n')
                     % (rev, repo[rev].hex()[:12])
                 )
                 ui.pushbuffer()
         if count:
             n.diff(ctx, repo[b'tip'])
     elif ctx.rev() in repo:
         if not n.node(ctx):
             ui.popbuffer()
             ui.note(
                 _(b'notify: suppressing notification for merge %d:%s\n')
                 % (ctx.rev(), ctx.hex()[:12])
             )
             return
         count += 1
         n.diff(ctx)
         if not author:
             author = ctx.user()
 
     data += ui.popbuffer()
     fromauthor = ui.config(b'notify', b'fromauthor')
     if author and fromauthor:
         data = b'\n'.join([b'From: %s' % author, data])
 
     if count:
         n.send(ctx, count, data)
 
 
 def messageid(ctx, domain, messageidseed):
     if domain and messageidseed:
         host = domain
     else:
         host = encoding.strtolocal(socket.getfqdn())
     if messageidseed:
         messagehash = hashlib.sha512(ctx.hex() + messageidseed)
         messageid = b'<hg.%s@%s>' % (
             pycompat.sysbytes(messagehash.hexdigest()[:64]),
             host,
         )
     else:
         messageid = b'<hg.%s.%d.%d@%s>' % (
             ctx,
             int(time.time()),
             hash(ctx.repo().root),
             host,
         )
     return encoding.strfromlocal(messageid)