Tahoe-lafs

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Backwards Incompatible Changes
------------------------------

- Properly interpret "tahoe create --storage-dir" as an option.

Versions 1.19.0 and older interpreted "--storage-dir" as a "flag" and thus wouldn't work properly. (`4110 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4110>`_)


Features
--------

- Continued work to make Tahoe-LAFS take advantage of multiple CPUs. (`4072 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4072>`_)
- Mutable directories can now be created with a pre-determined "signature key" via the web API using the "private-key=..." parameter. The "private-key" value must be a DER-encoded 2048-bit RSA private key in urlsafe base64 encoding. (`4094 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4094>`_)


Bug Fixes
---------

- Upgrade CBOR, fixing encoding on 65KiB++ strings (`4087 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4087>`_)
- Stop using the C version of the cbor2 decoder. (`4088 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4088>`_)
- Fix incompatibility with cryptography 43. (`4100 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4100>`_)
- Fix incompatibility with attrs 24.1. (`4101 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4101>`_)


Dependency/Installation Changes
-------------------------------

- Now using the "hatch" build system, and pyproject.toml (exclusively) (`4133 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4133>`_)


Documentation Changes
---------------------

- Tahoe-LAFS manual's table of contents page has been reorganized. (`3636 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3636>`_)
- Add a global Sphinx generated glossary. Link the static GBS glossary to the global glossary. (`4116 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4116>`_)


Misc/Other
----------

- `3636 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3636>`_, `#4076 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4076>`_, `#4082 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4082>`_, `#4085 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4085>`_, `#4090 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4090>`_, `#4091 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4091>`_, `#4092 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4092>`_, `#4093 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4093>`_, `#4114 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4114>`_, `#4115 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4115>`_, `#4126 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4126>`_, `#4130 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4130>`_, `#4132 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4132>`_, `#4134 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4134>`_, `#4141 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4141>`_

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Features
--------

- Tahoe-LAFS now includes a new "Grid Manager" specification and implementation adding more options to control which storage servers a client will use for uploads. (`2916 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2916>`_)
- Added support for Python 3.12, and work with Eliot 1.15 (`3072 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3072>`_)
- `tahoe run ...` will now exit when its stdin is closed.

This facilitates subprocess management, specifically cleanup.
When a parent process is running tahoe and exits without time to do "proper" cleanup at least the stdin descriptor will be closed.
Subsequently "tahoe run" notices this and exits. (`3921 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3921>`_)
- Mutable objects can now be created with a pre-determined "signature key" using the ``tahoe put`` CLI or the HTTP API. This enables deterministic creation of mutable capabilities. This feature must be used with care to preserve the normal security and reliability properties. (`3962 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3962>`_)
- Added support for Python 3.11. (`3982 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3982>`_)
- tahoe run now accepts --allow-stdin-close to mean "keep running if stdin closes" (`4036 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4036>`_)
- The storage server and client now support a new, HTTPS-based protocol. (`4041 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4041>`_)
- Started work on a new end-to-end benchmarking framework. (`4060 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4060>`_)
- Some operations now run in threads, improving the responsiveness of Tahoe nodes. (`4068 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4068>`_)
- Logs are now written in a thread, which should make the application more responsive under load. (`4804 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4804>`_)


Bug Fixes
---------

- Provide better feedback from plugin configuration errors

Local errors now print a useful message and exit.
Announcements that only contain invalid / unusable plugins now show a message in the Welcome page. (`3899 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3899>`_)
- Work with (and require) newer versions of pycddl. (`3938 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3938>`_)
- Uploading immutables will now better use available bandwidth, which should allow for faster uploads in many cases. (`3939 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3939>`_)
- Downloads of large immutables should now finish much faster. (`3946 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3946>`_)
- Fix incompatibility with transitive dependency charset_normalizer >= 3 when using PyInstaller. (`3966 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3966>`_)
- A bug where Introducer nodes configured to listen on Tor or I2P would not actually do so has been fixed. (`3999 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3999>`_)
- The (still off-by-default) HTTP storage client will now use Tor when Tor-based client-side anonymity was requested.
Previously it would use normal TCP connections and not be anonymous. (`4029 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4029>`_)
- Provide our own copy of attrs' "provides()" validator

This validator is deprecated and slated for removal; that project's suggestion is to copy the code to our project. (`4056 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4056>`_)
- Fix a race condition with SegmentFetcher (`4078 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4078>`_)


Dependency/Installation Changes
-------------------------------

- tenacity is no longer a dependency. (`3989 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3989>`_)


Documentation Changes
---------------------

- Several minor errors in the Great Black Swamp proposed specification document have been fixed. (`3922 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3922>`_)
- Document the ``force_foolscap`` configuration options for ``[storage]`` and ``[client]``. (`4039 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4039>`_)


Removed Features
----------------

- Python 3.7 is no longer supported, and Debian 10 and Ubuntu 18.04 are no longer tested. (`3964 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3964>`_)


Other Changes
-------------

- The integration test suite now includes a set of capability test vectors (``integration/vectors/test_vectors.yaml``) which can be used to verify compatibility between Tahoe-LAFS and other implementations. (`3961 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3961>`_)


Misc/Other
----------

- `3508 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3508>`_, `#3622 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3622>`_, `#3783 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3783>`_, `#3870 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3870>`_, `#3874 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3874>`_, `#3880 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3880>`_, `#3904 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3904>`_, `#3910 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3910>`_, `#3914 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3914>`_, `#3917 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3917>`_, `#3927 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3927>`_, `#3928 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3928>`_, `#3935 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3935>`_, `#3936 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3936>`_, `#3937 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3937>`_, `#3940 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3940>`_, `#3942 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3942>`_, `#3944 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3944>`_, `#3947 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3947>`_, `#3950 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3950>`_, `#3952 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3952>`_, `#3953 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3953>`_, `#3954 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3954>`_, `#3956 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3956>`_, `#3958 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3958>`_, `#3959 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3959>`_, `#3960 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3960>`_, `#3965 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3965>`_, `#3967 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3967>`_, `#3968 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3968>`_, `#3969 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3969>`_, `#3970 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3970>`_, `#3971 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3971>`_, `#3974 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3974>`_, `#3975 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3975>`_, `#3976 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3976>`_, `#3978 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3978>`_, `#3987 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3987>`_, `#3988 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3988>`_, `#3991 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3991>`_, `#3993 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3993>`_, `#3994 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3994>`_, `#3996 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3996>`_, `#3998 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3998>`_, `#4000 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4000>`_, `#4001 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4001>`_, `#4002 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4002>`_, `#4003 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4003>`_, `#4004 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4004>`_, `#4005 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4005>`_, `#4006 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4006>`_, `#4009 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4009>`_, `#4010 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4010>`_, `#4012 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4012>`_, `#4014 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4014>`_, `#4015 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4015>`_, `#4016 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4016>`_, `#4018 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4018>`_, `#4019 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4019>`_, `#4020 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4020>`_, `#4022 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4022>`_, `#4023 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4023>`_, `#4024 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4024>`_, `#4026 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4026>`_, `#4027 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4027>`_, `#4028 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4028>`_, `#4035 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4035>`_, `#4038 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4038>`_, `#4040 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4040>`_, `#4042 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4042>`_, `#4044 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4044>`_, `#4046 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4046>`_, `#4047 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4047>`_, `#4049 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4049>`_, `#4050 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4050>`_, `#4051 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4051>`_, `#4052 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4052>`_, `#4055 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4055>`_, `#4059 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4059>`_, `#4061 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4061>`_, `#4062 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4062>`_, `#4063 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4063>`_, `#4065 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4065>`_, `#4066 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4066>`_, `#4070 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4070>`_, `#4074 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4074>`_, `#4075 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4075>`_

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Backwards Incompatible Changes
------------------------------

- Python 3.6 is no longer supported, as it has reached end-of-life and is no longer receiving security updates. (`3865 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3865>`_)
- Python 3.7 or later is now required; Python 2 is no longer supported. (`3873 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3873>`_)
- Share corruption reports stored on disk are now always encoded in UTF-8. (`3879 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3879>`_)
- Record both the PID and the process creation-time:

a new kind of pidfile in `running.process` records both
the PID and the creation-time of the process. This facilitates
automatic discovery of a "stale" pidfile that points to a
currently-running process. If the recorded creation-time matches
the creation-time of the running process, then it is a still-running
`tahoe run` process. Otherwise, the file is stale.

The `twistd.pid` file is no longer present. (`3926 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3926>`_)


Features
--------

- The implementation of SDMF and MDMF (mutables) now requires RSA keys to be exactly 2048 bits, aligning them with the specification.

Some code existed to allow tests to shorten this and it's
conceptually possible a modified client produced mutables
with different key-sizes. However, the spec says that they
must be 2048 bits. If you happen to have a capability with
a key-size different from 2048 you may use 1.17.1 or earlier
to read the content. (`3828 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3828>`_)
- "make" based release automation (`3846 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3846>`_)


Misc/Other
----------

- `3327 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3327>`_, `#3526 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3526>`_, `#3697 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3697>`_, `#3709 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3709>`_, `#3786 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3786>`_, `#3788 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3788>`_, `#3802 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3802>`_, `#3816 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3816>`_, `#3855 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3855>`_, `#3858 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3858>`_, `#3859 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3859>`_, `#3860 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3860>`_, `#3867 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3867>`_, `#3868 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3868>`_, `#3871 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3871>`_, `#3872 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3872>`_, `#3875 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3875>`_, `#3876 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3876>`_, `#3877 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3877>`_, `#3881 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3881>`_, `#3882 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3882>`_, `#3883 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3883>`_, `#3889 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3889>`_, `#3890 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3890>`_, `#3891 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3891>`_, `#3893 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3893>`_, `#3895 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3895>`_, `#3896 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3896>`_, `#3898 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3898>`_, `#3900 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3900>`_, `#3909 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3909>`_, `#3913 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3913>`_, `#3915 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3915>`_, `#3916 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3916>`_

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Bug Fixes
---------

- Fixed regression on Python 3 causing the JSON version of the Welcome page to sometimes produce a 500 error (`3852 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3852>`_)
- Fixed regression on Python 3 where JSON HTTP POSTs failed to be processed. (`3854 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3854>`_)


Misc/Other
----------

- `3848 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3848>`_, `#3849 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3849>`_, `#3850 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3850>`_, `#3856 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3856>`_

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Security-related Changes
------------------------

- The introducer server no longer writes the sensitive introducer fURL value to its log at startup time. Instead it writes the well-known path of the file from which this value can be read. (`3819 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3819>`_)
- The storage protocol operation ``add_lease`` now safely rejects an attempt to add a 4,294,967,296th lease to an immutable share.
Previously this failed with an error after recording the new lease in the share file, resulting in the share file losing track of a one previous lease. (`3821 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3821>`_)
- The storage protocol operation ``readv`` now safely rejects attempts to read negative lengths.
Previously these read requests were satisfied with the complete contents of the share file (including trailing metadata) starting from the specified offset. (`3822 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3822>`_)
- The storage server implementation now respects the ``reserved_space`` configuration value when writing lease information and recording corruption advisories.
Previously, new leases could be created and written to disk even when the storage server had less remaining space than the configured reserve space value.
Now this operation will fail with an exception and the lease will not be created.
Similarly, if there is no space available, corruption advisories will be logged but not written to disk. (`3823 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3823>`_)
- The storage server implementation no longer records corruption advisories about storage indexes for which it holds no shares. (`3824 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3824>`_)
- The lease-checker now uses JSON instead of pickle to serialize its state.

tahoe will now refuse to run until you either delete all pickle files or
migrate them using the new command::

tahoe admin migrate-crawler

This will migrate all crawler-related pickle files. (`3825 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3825>`_)
- The SFTP server no longer accepts password-based credentials for authentication.
Public/private key-based credentials are now the only supported authentication type.
This removes plaintext password storage from the SFTP credentials file.
It also removes a possible timing side-channel vulnerability which might have allowed attackers to discover an account's plaintext password. (`3827 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3827>`_)
- The storage server now keeps hashes of lease renew and cancel secrets for immutable share files instead of keeping the original secrets. (`3839 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3839>`_)
- The storage server now keeps hashes of lease renew and cancel secrets for mutable share files instead of keeping the original secrets. (`3841 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3841>`_)


Features
--------

- Tahoe-LAFS releases now have just a .tar.gz source release and a (universal) wheel (`3735 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3735>`_)
- tahoe-lafs now provides its statistics also in OpenMetrics format (for Prometheus et. al.) at `/statistics?t=openmetrics`. (`3786 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3786>`_)
- If uploading an immutable hasn't had a write for 30 minutes, the storage server will abort the upload. (`3807 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3807>`_)


Bug Fixes
---------

- When uploading an immutable, overlapping writes that include conflicting data are rejected. In practice, this likely didn't happen in real-world usage. (`3801 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3801>`_)


Dependency/Installation Changes
-------------------------------

- Tahoe-LAFS now supports running on NixOS 21.05 with Python 3. (`3808 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3808>`_)


Documentation Changes
---------------------

- The news file for future releases will include a section for changes with a security impact. (`3815 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3815>`_)


Removed Features
----------------

- The little-used "control port" has been removed from all node types. (`3814 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3814>`_)


Other Changes
-------------

- Tahoe-LAFS no longer runs its Tor integration test suite on Python 2 due to the increased complexity of obtaining compatible versions of necessary dependencies. (`3837 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3837>`_)


Misc/Other
----------

- `3525 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3525>`_, `#3527 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3527>`_, `#3754 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3754>`_, `#3758 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3758>`_, `#3784 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3784>`_, `#3792 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3792>`_, `#3793 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3793>`_, `#3795 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3795>`_, `#3797 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3797>`_, `#3798 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3798>`_, `#3799 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3799>`_, `#3800 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3800>`_, `#3805 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3805>`_, `#3806 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3806>`_, `#3810 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3810>`_, `#3812 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3812>`_, `#3820 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3820>`_, `#3829 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3829>`_, `#3830 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3830>`_, `#3831 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3831>`_, `#3832 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3832>`_, `#3833 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3833>`_, `#3834 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3834>`_, `#3835 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3835>`_, `#3836 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3836>`_, `#3838 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3838>`_, `#3842 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3842>`_, `#3843 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3843>`_, `#3847 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3847>`_

'''''''''''''''''''''''''''

Backwards Incompatible Changes
------------------------------

- The Tahoe command line now always uses UTF-8 to decode its arguments, regardless of locale. (`3588 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3588>`_)
- tahoe backup's --exclude-from has been renamed to --exclude-from-utf-8, and correspondingly requires the file to be UTF-8 encoded. (`3716 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3716>`_)


Features
--------

- Added 'typechecks' environment for tox running mypy and performing static typechecks. (`3399 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3399>`_)
- The NixOS-packaged Tahoe-LAFS now knows its own version. (`3629 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3629>`_)


Bug Fixes
---------

- Fix regression that broke flogtool results on Python 2. (`3509 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3509>`_)
- Fix a logging regression on Python 2 involving unicode strings. (`3510 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3510>`_)
- Certain implementation-internal weakref KeyErrors are now handled and should no longer cause user-initiated operations to fail. (`3539 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3539>`_)
- SFTP public key auth likely works more consistently, and SFTP in general was previously broken. (`3584 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3584>`_)
- Fixed issue where redirecting old-style URIs (/uri/?uri=...) didn't work. (`3590 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3590>`_)
- ``tahoe invite`` will now read share encoding/placement configuration values from a Tahoe client node configuration file if they are not given on the command line, instead of raising an unhandled exception. (`3650 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3650>`_)
- Fix regression where uploading files with non-ASCII names failed. (`3738 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3738>`_)
- Fixed annoying UnicodeWarning message on Python 2 when running CLI tools. (`3739 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3739>`_)
- Fixed bug where share corruption events were not logged on storage servers running on Windows. (`3779 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3779>`_)


Dependency/Installation Changes
-------------------------------

- Tahoe-LAFS now requires Twisted 19.10.0 or newer. As a result, it now has a transitive dependency on bcrypt. (`1549 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1549>`_)
- Debian 8 support has been replaced with Debian 10 support. (`3326 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3326>`_)
- Tahoe-LAFS no longer depends on Nevow. (`3433 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3433>`_)
- Tahoe-LAFS now requires the `netifaces` Python package and no longer requires the external `ip`, `ifconfig`, or `route.exe` executables. (`3486 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3486>`_)
- The Tahoe-LAFS project no longer commits to maintaining binary packages for all dependencies at <https://tahoe-lafs.org/deps>. Please use PyPI instead. (`#3497 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3497>`_)
- Tahoe-LAFS now uses a forked version of txi2p (named txi2p-tahoe) with Python 3 support. (`3633 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3633>`_)
- The Nix package now includes correct version information. (`3712 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3712>`_)
- Use netifaces 0.11.0 wheel package from PyPI.org if you use 64-bit Python 2.7 on Windows. VCPython27 downloads are no longer available at Microsoft's website, which has made building Python 2.7 wheel packages of Python libraries with C extensions (such as netifaces) on Windows difficult. (`3733 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3733>`_)


Configuration Changes
---------------------

- The ``[client]introducer.furl`` configuration item is now deprecated in favor of the ``private/introducers.yaml`` file. (`3504 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3504>`_)


Documentation Changes
---------------------

- Documentation now has its own towncrier category. (`3664 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3664>`_)
- `tox -e docs` will treat warnings about docs as errors. (`3666 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3666>`_)
- The visibility of the Tahoe-LAFS logo has been improved for "dark" themed viewing. (`3677 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3677>`_)
- A cheatsheet-style document for contributors was created at CONTRIBUTORS.rst (`3682 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3682>`_)
- Our IRC channel, tahoe-lafs, has been moved to irc.libera.chat. (`3721 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3721>`_)
- Tahoe-LAFS project is now registered with Libera.Chat IRC network. (`3726 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3726>`_)
- Rewriting the installation guide for Tahoe-LAFS. (`3747 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3747>`_)
- Documentation and installation links in the README have been fixed. (`3749 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3749>`_)
- The Great Black Swamp proposed specification now includes sample interactions to demonstrate expected usage patterns. (`3764 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3764>`_)
- The Great Black Swamp proposed specification now includes a glossary. (`3765 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3765>`_)
- The Great Black Swamp specification now allows parallel upload of immutable share data. (`3769 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3769>`_)
- There is now a specification for the scheme which Tahoe-LAFS storage clients use to derive their lease renewal secrets. (`3774 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3774>`_)
- The Great Black Swamp proposed specification now has a simplified interface for reading data from immutable shares. (`3777 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3777>`_)
- tahoe-dev mailing list is now at tahoe-devlists.tahoe-lafs.org. (`3782 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3782>`_)
- The Great Black Swamp specification now describes the required authorization scheme. (`3785 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3785>`_)
- The "Great Black Swamp" proposed specification has been expanded to include two lease management APIs. (`3037 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3037>`_)
- The specification section of the Tahoe-LAFS documentation now includes explicit discussion of the security properties of Foolscap "fURLs" on which it depends. (`3503 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3503>`_)
- The README, revised by Viktoriia with feedback from the team, is now more focused on the developer community and provides more information about Tahoe-LAFS, why it's important, and how someone can use it or start contributing to it. (`3545 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3545>`_)
- The "Great Black Swamp" proposed specification has been changed use ``v=1`` as the URL version identifier. (`3644 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3644>`_)
- You can run `make livehtml` in docs directory to invoke sphinx-autobuild. (`3663 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3663>`_)


Removed Features
----------------

- Announcements delivered through the introducer system are no longer automatically annotated with copious information about the Tahoe-LAFS software version nor the versions of its dependencies. (`3518 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3518>`_)
- The stats gatherer, broken since at least Tahoe-LAFS 1.13.0, has been removed. The ``[client]stats_gatherer.furl`` configuration item in ``tahoe.cfg`` is no longer allowed. The Tahoe-LAFS project recommends using a third-party metrics aggregation tool instead. (`3549 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3549>`_)
- The deprecated ``tahoe`` start, restart, stop, and daemonize sub-commands have been removed. (`3550 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3550>`_)
- FTP is no longer supported by Tahoe-LAFS. Please use the SFTP support instead. (`3583 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3583>`_)
- Removed support for the Account Server frontend authentication type. (`3652 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3652>`_)


Other Changes
-------------

- Refactored test_introducer in web tests to use custom base test cases (`3757 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3757>`_)


Misc/Other
----------

- `2928 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2928>`_, `#3283 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3283>`_, `#3314 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3314>`_, `#3384 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3384>`_, `#3385 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3385>`_, `#3390 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3390>`_, `#3404 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3404>`_, `#3428 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3428>`_, `#3432 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3432>`_, `#3434 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3434>`_, `#3435 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3435>`_, `#3454 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3454>`_, `#3459 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3459>`_, `#3460 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3460>`_, `#3465 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3465>`_, `#3466 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3466>`_, `#3467 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3467>`_, `#3468 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3468>`_, `#3470 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3470>`_, `#3471 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3471>`_, `#3472 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3472>`_, `#3473 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3473>`_, `#3474 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3474>`_, `#3475 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3475>`_, `#3477 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3477>`_, `#3478 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3478>`_, `#3479 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3479>`_, `#3481 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3481>`_, `#3482 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3482>`_, `#3483 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3483>`_, `#3485 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3485>`_, `#3488 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3488>`_, `#3490 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3490>`_, `#3491 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3491>`_, `#3492 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3492>`_, `#3493 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3493>`_, `#3496 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3496>`_, `#3499 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3499>`_, `#3500 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3500>`_, `#3501 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3501>`_, `#3502 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3502>`_, `#3511 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3511>`_, `#3513 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3513>`_, `#3514 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3514>`_, `#3515 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3515>`_, `#3517 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3517>`_, `#3520 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3520>`_, `#3521 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3521>`_, `#3522 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3522>`_, `#3523 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3523>`_, `#3524 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3524>`_, `#3528 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3528>`_, `#3529 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3529>`_, `#3532 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3532>`_, `#3533 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3533>`_, `#3534 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3534>`_, `#3536 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3536>`_, `#3537 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3537>`_, `#3542 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3542>`_, `#3544 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3544>`_, `#3546 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3546>`_, `#3547 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3547>`_, `#3551 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3551>`_, `#3552 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3552>`_, `#3553 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3553>`_, `#3555 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3555>`_, `#3557 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3557>`_, `#3558 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3558>`_, `#3560 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3560>`_, `#3563 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3563>`_, `#3564 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3564>`_, `#3565 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3565>`_, `#3566 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3566>`_, `#3567 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3567>`_, `#3568 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3568>`_, `#3572 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3572>`_, `#3574 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3574>`_, `#3575 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3575>`_, `#3576 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3576>`_, `#3577 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3577>`_, `#3578 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3578>`_, `#3579 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3579>`_, `#3580 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3580>`_, `#3582 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3582>`_, `#3587 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3587>`_, `#3588 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3588>`_, `#3589 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3589>`_, `#3591 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3591>`_, `#3592 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3592>`_, `#3593 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3593>`_, `#3594 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3594>`_, `#3595 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3595>`_, `#3596 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3596>`_, `#3599 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3599>`_, `#3600 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3600>`_, `#3603 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3603>`_, `#3605 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3605>`_, `#3606 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3606>`_, `#3607 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3607>`_, `#3608 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3608>`_, `#3611 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3611>`_, `#3612 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3612>`_, `#3613 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3613>`_, `#3615 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3615>`_, `#3616 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3616>`_, `#3617 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3617>`_, `#3618 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3618>`_, `#3619 <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3619>`_, `#3620 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