If the username value is not provided on the configuration file, then
username if of NoneType and NULL.join will bomb since Nones can't be
joined with strings. So check if username is empty and raise an
exception if so.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/558
Signed-off-by: David Miguel Susano Pinto <carandraug+dev@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
When asking for a password interactively, the username is never
displayed which may hide problems (typos on the configuration, or
issues on offlineimap parsing of the config file). The hostname,
port, and account name are already displayed when establishing the
connection. When asking for password, the account name is displayed
again. Change it to display the username.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/558
Signed-off-by: David Miguel Susano Pinto <carandraug+dev@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Fix bug in GSSAPI auth where the username was not being negotiated.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/541
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Tested-by: Frank Lenormand <lenormf@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Reported-by Heinrich Hartmann <Heinrich@HeinrichHartmann.com>
Tested-by Heinrich Hartmann <Heinrich@HeinrichHartmann.com>
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/545
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
We use current hostname as the element of the unique file name.
Sometimes there is non-/24 zone delegation,
{{{
$ host 144.206.233.65
65.233.206.144.in-addr.arpa is an alias for 65.26/64.233.206.144.in-addr.arpa.
}}}
as per RFC 2317,
https://www.rfc-editor.org/rfc/rfc2317.txt
So on Un*x systems we may run into having path separator inside
the file name. Not good, things will choke. Prevented this
by substituting all appeared path separators in the return value.
Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>
Tested-at: my MacOSX instance, my FreeBSD instances
python-gssapi has a visible, active upstream and a more pleasant
interface. python-gssapi is present in most distributions, while
pykerberos is slated for removal from Fedora/RHEL/CentOS.
Github-ref: https://github.com/OfflineIMAP/offlineimap/pull/529
Tested-by: Robbie Harwood <rharwood@redhat.com>
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
With new emails we could have negative UIDs in come use cases. Exclude these
from the list of UIDs. The negative UIDs lead to invalid SEARCH command:
SEARCH command error: BAD ['Could not parse command']. Data: FMAO19 SEARCH (UID -4:*)
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/512
Tested-by: https://github.com/shubhamkrm
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
It was previously printing "Upgrading LocalStatus cache from version 1to version 2 for XXX"
Signed-off-by: John Ferlito <johnf@inodes.org>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
When there is not UIDPLUS we have to figure the UID by our means. When this
process fails, we don't know if the email was successfully uploaded. This patch
provides better logs to explain what happened.
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
It's required to modify my change 1ce596d713
because a hostname shouldn't be needed if any tunnel is used. Both tunnels
provide a regular IMAP interface which is used by offlineimap.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/503
Reported-by: Ilias Tsitsimpis <i.tsitsimpis@gmail.com>
Signed-off-by: Thomas Merkel <tm@core.io>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This behaviour is what users would expected most. The error message is about
utf8foldernames and decodefoldernames.
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
The new 'utf8foldernames' will not work together with the existing
'decodefoldernames' option (which will be documented in the next
commit). Therefore this commit will check for this condition and
abort the synchronization of a misconfigured account before doing
any changes.
Other accounts are not affected.
Signed-off-by: Urs Liska <git@ursliska.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
If utf8foldernames is enabled on account level all folder names read
from the IMAP server will immediately be reencoded to UTF-8. Names
will be treated as UTF-8 as long as the IMAP server isn't contacted again,
for which they are reencoded to IMAP4-UTF-7.
This means that any further processing such as nametrans, folderfilter
etc. will act upon the UTF-8 names, which will have to be documented
carefully.
NOTE 1:
GMail repositories and folders inherit from the IMAP... classes, so I don't
know yet if these changes have ugly side-effects. But web research suggests
that GMail IMAP folders are equally encoded in UTF-7 so that should work
identically here and incorporate the same improvements.
NOTE 2:
I could not test the behaviour with idlefolders as I didn't get this option
to work at all, not even with the latest stable version.
NOTE 3:
I *did* test to sync an IMAP repository against another IMAP repository.
Signed-off-by: Urs Liska <git@ursliska.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
While intending *not* to change the behaviour of the existing
decodefoldernames option this commit transparently improves
the coding.
So far this worked by overriding the folder's getvisiblename() method
which reads self.visiblename from and applies the conversion on
*every* invocation of getvisiblename().
This commit does the calculation once in the IMAPFolder's __init__.
Signed-off-by: Urs Liska <git@ursliska.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This commit adds two functions
- imaputil.IMAP_utf8()
- imaputil.utf8_IMAP()
as an interface to the new imap4_utf_7 codec.
Signed-off-by: Urs Liska <git@ursliska.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
If the config option `transporttunnel` is used the option `remotehost` is not
needed, because the tunnel provide the IMAP connection.
Signed-off-by: Thomas Merkel <tm@core.io>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
The support for the realdelete configuration option was removed because this
could lead to data loss.
See 51728ed to know more.
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Some returned responses end with ')' rather than 'UID XXX)' as expected.
BTW, a better policy could be to request for the 'X-OfflineIMAP' header only
rather than fetching all the headers and looking for it manually.
Also:
- Strip the output when error occurs: we don't need the full response unless
'imap' debug mode is enabled.
- Improve the comments.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/479
Tested-by: https://github.com/secomi
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
On each folder scan, we must compute the min_uid. Locally, this is done by
relying on the prefix timestamp in the filenames. If for whatever reason they do
not reflect the Date header of the email, changing maxage leads to undefined
behaviour.
To prevent from this, we rather rely on the remote folder. We assume that the
remotes are more reliable to provide correct sets of UIDs based on dates than we
are.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/384
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
mbnames is initialized and written once in the run from OfflineImap.__sync().
However, the in-memory instance is fed with data at sync time for each folder
and the intermediate files are written as soon as all the folders are synced for
the account. All of this is done inside the SyncableAccount.__sync() method
while the syncrunner is looping on this.
This means that we duplicate entries for mbnames in each loop (most likely when
autorefresh is enabled).
It is wrong to have duplicates in mbnames for each account. Ignore duplicates
when adding data in the mbnames intermediate files.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/467
Reported-and-tested-by: Shin Kojima <shin@kojima.org>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Some users might use more than one python/imaplib version. This tends to make
debugging and support harder.
Displaying this information by default for each run should help.
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Checking if we have to run this authentication method once it's already passed
to imaplib2 is too late. Make the checks at correct time, before we try the
authentication method. IOW, before we call
imapobj.authenticate('XOAUTH2', self.__xoauth2handler)
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/442
Tested-by: Klemens Schölhorn <klemens@schoelhorn.eu>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Make sure that we refresh the screen atomically, since the emit()
function may be called by more that one threads at a time.
Also, modify the draw_bannerwin() method which used to fail in case the
window would become too small. Make sure that the provided offsets to
the window.addstr() method are properly bounded.
Closes#160: blinkenlights display is broken
Tested-by: Cyril Brulebois
Tested-by: Gaudenz Steinlin
Signed-off-by: Ilias Tsitsimpis <i.tsitsimpis@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Stop the run when this option is found. Migrating from the historical plain
text status cache is still supported.
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This would require more digging to understand how this is possible. I suspect
that a previous run has been interrupted.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/445
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Use a mutex to lock the sync transaction, uniquely identified by the remote
folder name.
Serializing the syncs prevents any IDLE thread from syncing the same folder of
a concurrent autorefresh thread. Othewise, we could download new messages
twice, or read "one message past the last one" which in some cases creates a
duplicated messages. Also prevents IDLE threads from reading new messages
before the autorefresh thread finishes synchronization.
Github-ref: #421
Originally-submitted-by: Michael Hohmuth <hohmuth@sax.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
According to documentation and the code, the following behavior is expected:
ipv6 = no
AF_INET is used
ipv6 = yes
AF_INET6 is used
ipv6 undefined
AF_UNDEF is used
Unfortunately the code parsing the "ipv6" configuration option was
returning "False" rather than "None" when failing to locate the option,
making it impossible to detect whether "ipv6" isn't set or if it was set
to "false" and leading offlineimap to use AF_INET for the connection.
This fixes the use of offlineimap on hosts that occasionaly are
connected to IPv6-only networks.
Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
The saveall() method must acquire the lock to make writes.
Reported-and-tested-by: Julien Cubizolles <j.cubizolles@free.fr>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
systemd supports a watchdog (via the WatchdogSec service file option)
which will send the program a SIGABRT when the timer expires, however
currently this causes offlineimap to be killed immediately.
This patch registers SIGABRT and handles it in the same manner as
SIGUSR2, so that the current synchronisation is completed before the
program exits safely.
This makes offlineimap more flexible and robust for persistent setups
that make use of holdconnectionopen and autorefresh options.
For example, it may be useful in assisting with the occasional
situation where offlineimap may not return successfully after a suspend
and resume.
To make use of this, users could add the following to the [Service]
section of their systemd offlineimap service file (restart every 5
minutes):
Restart=on-watchdog
WatchdogSec=300
Signed-off-by: Chris Smart <mail@csmart.io>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Allow retrying the download of messages more than twice.
Signed-off-by: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Allow to use a another proxy for authentication than for IMAP.
Signed-off-by: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Commit e51ed80e claims to add tilde and environment variable expansion
to multiple locations including Repository.localfolders. However, this
particular options seems to have been missed in that commit, and
apparently no one noticed till date
Signed-off-by: Darshit Shah <darnir@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
481efa95f6 is wrong to assume the local nametrans is set up and working.
Now, we correctly check that the local folder name is the same once both
nametrans are applied to itself. This check is only done when we have to create
the folder on remote.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/413
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
When creating a folder on the remote, the status folder was created
using the remote folder name, but then Account assumed the statusfolder
name matched the local folder. Correct this.
Signed-off-by: Abdo Roig-Maranges <abdo.roig@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Ensure we work on the correct names when coparing the structures.
This might revert changes made in 22641331c1 and would require mode
checks. However, having correct folder structure comparison is more important
than having the not official UTF-8 support.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/405
Tested-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
The GMail repository added in 81b86fb has the restriction that you
can't override the host/port/ssl etc. There's no good reason for this,
and I'd like to use some of the defaults while connecting to GMail via
an stunnel, i.e.:
$ grep -v -e ^# -e ^$ .stunnel.work-gmail-imap
foreground = yes
debug = info
pid =
[work-imap-gmail-ssl-tunnel]
client = yes
accept = 127.0.0.1:1431
connect = imap.gmail.com:993
delay = yes
And then in my .offlineimaprc:
type = Gmail
remotehost = localhost
remoteport = 1431
ssl = no
While I was at it I also allowed overriding all the other previously
hardcoded options, e.g. the "oauth2_request_url" can now be overridden
to e.g. a local non-https proxy to sniff & debug the traffic going
over the wire.
This doesn't break any existing configuration, since we still use the
provided defaults. It just allows odd uses like my own to use this
repository while e.g. not having to supply "trashfolder", "spamfolder"
& "oauth2_request_url". While I'm at it document in the
offlineimap.conf that we're setting those options to defaults in this
repository.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
get_os_name returns linux-opensuse on OpenSUSE, so add a line for linux-opensuse to __DEF_OS_LOCATIONS.
Signed-off-by: Michael Hohmuth <hohmuth@sax.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
sync_folder_structure wasn't applying utf7 decoding before comparing
folders.
This is a minimal fix that only modifies one function so it doesn't
interfere with rest of the code.
Signed-off-by: Stéphane Albert <sheeprine@oh.its.fake.nullplace.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Using standard offlineimap without specific utf8 nametrans makes
offlineimap crash when generating md5 of the folder because the
foldername is already an str.
Signed-off-by: Stéphane Albert <sheeprine@oh.its.fake.nullplace.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This should significantly improve performance when used to write large
amounts of messages.
This feature is enabled through the fsync configuration option.
Code refactorize around fsync.
This addresses #390 (although it doesn't necessarily fix all instances
of that problem yet).
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/390
Originally-written-by: Giel van Schijndel <me@mortis.eu>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
If the map file is not properly written (e.g. due to unexpected kill)
offlineimap might wrongly consider some UIDs to have been deleted from the local
side which could lead to data loss.
Use a temporary map file rather than writing to the map file directly.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/380
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Do not call resizeterm(), unless is_term_resized() returns True. This
breaks the busy-loop where resizeterm() pushes a KEY_RESIZE onto the
FIFO causing the screen to be redrawn indefinitely (Issue #290).
Also, clear and refresh the main window after it has been resized. This
hopefully fixes the problem where Blinkenlights UI becomes unreadable
after terminal resize (Issue #160).
Closes#160: blinkenlights display is broken
Closes#290: ncurses flicker with blinkenlights UI
Bug-Debian: https://bugs.debian.org/671087
Bug-Debian: https://bugs.debian.org/809676
Signed-off-by: Ilias Tsitsimpis <i.tsitsimpis@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
The `threadutil` module depends on the `ui` module, which cycle depends
on `threadutil` through the `Curses` module.
The `ui` module had been loaded before the `threadutil` module, breaking
the above circular dependency, but this was changed in a recent code
refactoring, preventing the `Curses` module from being loaded with the
following exception:
File "./offlineimap.py", line 23, in <module>
from offlineimap import OfflineImap
File "offlineimap/offlineimap/__init__.py", line 20, in <module>
from offlineimap.init import OfflineImap
File "offlineimap/offlineimap/init.py", line 30, in <module>
from offlineimap import globals, threadutil, accounts, folder, mbnames
File "offlineimap/offlineimap/threadutil.py", line 25, in <module>
from offlineimap.ui import getglobalui
File "offlineimap/offlineimap/ui/__init__.py", line 28, in <module>
from offlineimap.ui import Curses
File "offlineimap/offlineimap/ui/Curses.py", line 27, in <module>
from offlineimap.threadutil import ExitNotifyThread
ImportError: cannot import name ExitNotifyThread
Fix the above error by ensuring that the `ui` module gets loaded before
the `threadutil` module. Please note that the above fix is temporary,
and we should refactor the modules to not have circular dependencies.
Bug-Debian: https://bugs.debian.org/839862
Reported-by: Neil McGovern <neilm@debian.org>
Signed-off-by: Ilias Tsitsimpis <i.tsitsimpis@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
BaseFolder now exposes an __unicode__ method so that function needing
unicode transcoding don't crash due to ascii encoding errors.
Signed-off-by: Stéphane Albert <sheeprine@oh.its.fake.nullplace.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Don't pass the account name to the function returned by eval. This allows the
user to define his own arguments.
This fix the code according to the documentation provided in offlineimap.conf.
Github-fix: https://github.com/OfflineIMAP/offlineimap/issues/372
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
To further ensure that messages are synchronized strictly in UID
order, this option can be set to cause only one thread to be used
to synchronise an individual folder, though other folders may
be synchronized simultaneously by other threads.
Signed-off-by: James E. Blair <corvus@gnu.org>
Based-on-patch-by: James E. Blair <corvus@gnu.org>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Return a sorted list of UIDs in getmessageuidlist.
Some MUAs (and their users) like to display messages in UID order
(or "order received"). If offlineimap is used in IMAP<->IMAP mode,
then the order messages are received by the second IMAP server will
be different because offlineimap iterates over a UID list produced
from the keys of a dictionary, which is unsorted.
This change sorts that list of UIDs so that both IMAP servers will
have their messages in the same order (except those times where
messages are appended to folders on both repositories between
syncs).
Signed-off-by: James E. Blair <corvus@gnu.org>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This suppressing the warning generated when running offlineimap on
python2 with -3 switch:
offlineimap/folder/Base.py:29: DeprecationWarning: Overriding __eq__
blocks inheritance of __hash__ in 3.x
Since this object is mutable it should not be hashable.
From Python documentation[1]:
A class that overrides __eq__() and does not define __hash__() will
have its __hash__() implicitly set to None.
Therefore old behaviour is preserved.
[1] https://docs.python.org/3/reference/datamodel.html
Signed-off-by: Łukasz Żarnowiecki <dolohow@outlook.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
It is more readable and returns a list.
This continues work done in 19c4330.
Signed-off-by: Łukasz Żarnowiecki <dolohow@outlook.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This was causing the error message "not all arguments converted during
string formatting." Specifically:
```
% offlineimap -u machineui
OfflineIMAP 7.0.4
Licensed under the GNU GPL v2 or any later version (with an OpenSSL exception)
msg:protocol:MainThread:7.2.0
msg:initbanner:MainThread:OfflineIMAP+7.0.4%0A++Licensed+under+the+GNU+GPL+v2+or+any+later+version+%28with+an+OpenSSL+exception%29
msg:registerthread:Account+sync+MYHOST:MYHOST
msg:acct:Account+sync+MYHOST:MYHOST
error::Account+sync+MYHOST:ERROR%3A+While+attempting+to+sync+account+%27MYHOST%27%0A++not+all+arguments+converted+during+string+formatting
msg:acctdone:Account+sync+MYHOST:MYHOST
msg:threadExited:MainThread:Account+sync+MYHOST
msg:unregisterthread:MainThread:Account+sync+MYHOST
msg:terminate:MainThread:0%0A%0A
```
Signed-off-by: Christopher League <league@contrapunctus.net>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
Otherwise, it might be impossible to know which account is connecting when more
than one is syncing.
Code style.
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
They introduce a regression not allowing to discard the XOAUTH2 method when
expected.
The default lambda did not take the "account_name" argument.
Github-fix: https://github.com/OfflineIMAP/offlineimap/issues/362
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
OfflineIMAP frequently delivers mail files to the Maildir consisting exclusively
of a single ASCII digit in IDLE mode. IMAPFolder.getmessage expects 'data' to be
of the form
[(fetch-info, message-body)]
However, the imapobj.uid call in getmessage returns a list of *all* pending
untagged FETCH responses. If any message flags were changed in the selected
IMAP folder since the last command (by another client or another thread in
OfflineIMAP itself), the IMAP server will issue unsolicited FETCH responses
indicating these flag changes (RFC3501, section 7). When this happens, 'data'
will look like, for example
['1231 (FLAGS (\\Seen) UID 5300)',
'1238 (FLAGS (\\Seen) UID 5318)',
('1242 (UID 5325 BODY[] {7976}', message-body)]
Unfortunately, getmessage retrieves the message body as data[0][1], which in
this example is just the string "2", and this is what gets stored in the mail
file.
Multi-threaded OfflineIMAP with IDLE or holdconnectionopen is particularly
susceptible to this problem because flag changes synced back to the IMAP server
on one thread will appear as unsolicited FETCH responses on another thread if it
happens to have the same folder selected. This can also happen without IDLE or
holdconnectionopen or even in single-threaded OfflineIMAP with concurrent access
from other IMAP clients (webmail clients, etc.), though the window for the bug
is much smaller.
Ideally, either imaplib2 or getmessage would parse the fetch responses to find
the response for the requested UID. However, since IMAP only specifies
unilateral FETCH responses for flag changes, it's almost certainly safe to
simply find the element of 'data' that is a tuple (perhaps aborting if there is
more than one tuple) and use that.
Github-fix: https://github.com/OfflineIMAP/offlineimap/issues/162
Based-on-patch-by: Austin Clements <amdragon@MIT.EDU>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
