Magnet Links - choose what files to download

[cfp p2p]

settings.json configuration element.

------------------------------------------------------------

    "prefetch-magnets-enabled": false,

Recommend setting to true for best use of piece-temp-dir and
magnet links.

Default is false

Makes it possible to choose what files to download after 
getting magnet metadata

 When this is set to true torrents pause AFTER the metadata is
 acquired only IF torrent is started in a paused state:

i.e. web client:

RPC: "torrent-add" "paused" | boolean if true, don't start the
torrent

tranmsission-remote --start-paused

settings.json "start-added-torrents": false,

Queuing is correctly followed in that a queued torrent will 
NOT pause after retrieving metadata.
Pausing then resuming a torrent still in the retrieving 
metadata state cancels the pause after metadata acquisition.

With "prefetch-magnets-enabled" false default behavior remains.

note: some third party add-on clients like
transmission-remote-GUI always load the
torrent in a paused state while waiting in the 'parameters 
window when adding a new torrent'. Wait for the metadata 
acquisition there then check/uncheck the Start
torrent box for correct behavior.
------------------------------------------------------------



Other settings.json configuration elements.


------------------------------------------------------------

    "piece-temp-dir": "/_trs-pctmp",

example:

"piece-temp-dir": "C:/share/hdd/data/16gb/_trs-pctmp",

the default path is the config directory and a "pieces" 
sub-directory Changing this setting will only affect new 
torrents. Existing torrents will continue to use the same 
directory that was set when they were created.
see tr_sessionGetConfigDir() and tr_getDefaultPieceSubDir()


------------------------------------------------------------

    "reverify-torrents-tries": 0,

settings.json element "reverify-torrents-tries" which if 
greater than zero will reverify on completion until successful 
100% verify or reverify-torrents-tries times
at which time torrent is paused with error 'Reverify count 
exceeded - pausing torrent -- resetting retries'.
After this error message restarting the torrent then again
starts with original reverify-torrents-tries count. 
Default is 0, 
edit settings.json
"reverify-torrents-tries": 0, to greater than 0 to enable 
reverify.

------------------------------------------------------------


Manual bootstrapping as a fallback.

Just add a file ~/.config/transmission-daemon/dht.bootstrap
(same directory location as settings.json add dht.bootstrap)
that says something like

router.bittorrent.com 6881
router.utorrent.com 6881

and Transmission will bootstrap from those nodes if normal 
bootstrap fails.

------------------------------------------------------------

From

https://trac.transmissionbt.com/wiki/EditConfigFiles

https://trac.transmissionbt.com/wiki/EditConfigFiles#Options

and

https://trac.transmissionbt.com/wiki/EnvironmentVariables

    It's not always possible to set all configurations from the GUI, especially on
the Daemon or the Web Interface. This guide will try to give an overview of how and
what you can change. For the location of these files, look at the Configuration Files
page.
Note: The client should be closed before making changes, otherwise settings will be
reverted to it's previous state.
Some of Transmission's behavior can also be customized via EnvironmentVariables.


+++Options+++


Bandwidth

    alt-speed-enabled: Boolean (default = false, aka 'Turtle Mode')
    Note: Clicking the "Turtle" in the gui when the scheduler is enabled, will only
temporarily remove the scheduled limit until the next cycle.
    alt-speed-up: Number (KB/s, default = 50)
    alt-speed-down: Number (KB/s, default = 50)
    speed-limit-down: Number (KB/s, default = 100)
    speed-limit-down-enabled: Boolean (default = false)
    speed-limit-up: Number (KB/s, default = 100)
    speed-limit-up-enabled: Boolean (default = false)
    upload-slots-per-torrent: Number (default = 14)

Blocklists

    blocklist-url: String (default = ?http://www.example.com/blocklist)
    blocklist-enabled: Boolean (default = false)

Files and Locations

    download-dir: String (default = default locations)
    incomplete-dir: String (default = default locations) Directory to keep files in
until torrent is complete.
    incomplete-dir-enabled: Boolean (default = false) When enabled, new torrents will
download the files to incomplete-dir. When complete, the files will be moved to
download-dir.
    preallocation: Number (0 = Off, 1 = Fast, 2 = Full (slower but reduces disk
fragmentation), default = 1)
    rename-partial-files: Boolean (default = true) Postfix partially downloaded files
with ".part".
    start-added-torrents: Boolean (default = true) Start torrents as soon as they are
added.
    trash-original-torrent-files: Boolean (default = false) Delete torrents added
from the watch directory.
    umask: Number (default = 18) Sets transmission's file mode creation mask. See
?the umask(2) manpage for more information. Users who want their saved torrents to be
world-writable may want to set this value to 0. Bear in mind that the json markup
language only accepts numbers in base 10, so the standard umask(2) octal notation
"022" is written in settings.json as 18.
    watch-dir: String
    watch-dir-enabled: Boolean (default = false) Watch a directory for torrent files
and add them to transmission.
    Note: When watch-dir-enabled is true, only the transmission-daemon,
transmission-gtk, and transmission-qt applications will monitor watch-dir for new
.torrent files and automatically load them.

Misc

    cache-size-mb: Size (default = 4), in megabytes, to allocate for Transmission's
memory cache. The cache is used to help batch disk IO together, so increasing the
cache size can be used to reduce the number of disk reads and writes. Default is 2 if
configured with --enable-lightweight.
    dht-enabled: Boolean (default = true) Enable ?Distributed Hash Table (DHT).
    encryption: Number (0 = Prefer unencrypted connections, 1 = Prefer encrypted
connections, 2 = Require encrypted connections; default = 1) ?Encryption preference.
Encryption may help get around some ISP filtering, but at the cost of slightly higher
CPU use.
    lazy-bitfield-enabled: Boolean (default = true) May help get around some ISP
filtering. ?Vuze specification.
    lpd-enabled: Boolean (default = false) Enable ?Local Peer Discovery (LPD).
    message-level: Number (0 = None, 1 = Error, 2 = Info, 3 = Debug, default = 2) Set
verbosity of transmission messages.
    pex-enabled: Boolean (default = true) Enable ?Peer Exchange (PEX).
    prefetch-enabled: Boolean (default = true). When enabled, Transmission will hint
to the OS which piece data it's about to read from disk in order to satisfy requests
from peers. On Linux, this is done by passing POSIX_FADV_WILLNEED to
?posix_fadvise(). On OS X, this is done by passing F_RDADVISE to ?fcntl(). This
defaults to false if configured with --enable-lightweight.
    scrape-paused-torrents-enabled: Boolean (default = true)
    script-torrent-done-enabled: Boolean (default = false) Run a script at torrent
completion.
    script-torrent-done-filename: String (default = "") Path to script.
    utp-enabled: Boolean (default = true) Enable ?Micro Transport Protocol (µTP)

Peers

    bind-address-ipv4: String (default = "0.0.0.0") Where to listen for peer
connections
    bind-address-ipv6: String (default = "::") Where to listen for peer connections
    peer-congestion-algorithm: String. This is documented on
?http://www.pps.jussieu.fr/~jch/software/bittorrent/tcp-congestion-control.html.
    peer-limit-global: Number (default = 240)
    peer-limit-per-torrent: Number (default = 60)
    peer-socket-tos: String (default = "default") Set the ?Type-Of-Service (TOS)
parameter for outgoing TCP packets. Possible values are "default", "lowcost",
"throughput", "lowdelay" and "reliability". The value "lowcost" is recommended if
you're using a smart router, and shouldn't harm in any case.

Peer Port

    peer-port: Number (default = 51413)
    peer-port-random-high: Number (default = 65535)
    peer-port-random-low: Number (default = 1024)
    peer-port-random-on-start: Boolean (default = false)
    port-forwarding-enabled: Boolean (default = true) Enable ?UPnP or ?NAT-PMP.

Queuing

    download-queue-enabled: Boolean (default = true) When true, Transmission will
only download download-queue-size non-stalled torrents at once.
    download-queue-size: Number (default = 5) See download-queue-enabled.
    queue-stalled-enabled: Boolean (default = true) When true, torrents that have not
shared data for queue-stalled-minutes are treated as 'stalled' and are not counted
against the queue-download-size and seed-queue-size limits.
    queue-stalled-minutes: Number (default = 30) See queue-stalled-enabled.
    seed-queue-enabled: Boolean (default = false) When true. Transmission will only
seed seed-queue-size non-stalled torrents at once.
    seed-queue-size: Number (default = 10) See seed-queue-enabled.

RPC

    rpc-authentication-required: Boolean (default = false)
    rpc-bind-address: String (default = "0.0.0.0") Where to listen for RPC
connections
    rpc-enabled: Boolean (default = true)
    rpc-password: String
    rpc-port: Number (default = 9091)
    rpc-url: String (default = /transmission/. Added in v2.2)
    rpc-username: String
    rpc-whitelist: String (Comma-delimited list of IP addresses. Wildcards allowed
using '*'. Example: "127.0.0.*,192.168.*.*", Default: "127.0.0.1" )
    rpc-whitelist-enabled: Boolean (default = true)

Scheduling

    alt-speed-time-enabled: Boolean (default = false)
    Note: When enabled, this will toggle the alt-speed-enabled setting.
    alt-speed-time-begin: Number (default = 540, in minutes from midnight, 9am)
    alt-speed-time-end: Number (default = 1020, in minutes from midnight, 5pm)
    alt-speed-time-day: Number/bitfield (default = 127, all days)
        Start with 0, then for each day you want the scheduler enabled, add:
            Sunday: 1 (binary: 0000001)
            Monday: 2 (binary: 0000010)
            Tuesday: 4 (binary: 0000100)
            Wednesday: 8 (binary: 0001000)
            Thursday: 16 (binary: 0010000)
            Friday: 32 (binary: 0100000)
            Saturday: 64 (binary: 1000000)
        Examples:
            Weekdays: 62 (binary: 0111110)
            Weekends: 65 (binary: 1000001)
            All Days: 127 (binary: 1111111)
    idle-seeding-limit: Number (default = 30) Stop seeding after being idle for N
minutes.
    idle-seeding-limit-enabled: Boolean (default = false)
    ratio-limit: Number (default = 2.0)
    ratio-limit-enabled: Boolean (default = false)




    Environment Variables

Users can set environmental variables to override Transmission's default behavior and
for debugging.
Transmission-Specific Variables

    If TRANSMISSION_HOME is set, Transmission will look there for its settings
instead of in the default location.

    If TRANSMISSION_WEB_HOME is set, Transmission will look there for the Web
Interface files, such as the javascript, html, and graphics files.

    If TR_CURL_VERBOSE is set, debugging information for libcurl will be enabled.
More information about libcurl's debugging mode ?is available here.

    TR_DEBUG (undocumented).

    If TR_DEBUG_FD is set to an integer, that integer is treated as a ?file
descriptor and very verbose debugging information is written to it. For example, here
is how to turn on debugging and save it to a file named "runlog" when running
Transmission from a bash shell:

    $ export TR_DEBUG_FD=2
    $ transmission 2>runlog

    If TR_DHT_VERBOSE is set, then Transmission will log all of the DHT's activities
in excrutiating detail to standard error.

Standard Variables Used By Transmission

    If TRANSMISSION_WEB_HOME is not set, non-Mac platforms will look for the Web
Interface files in XDG_DATA_HOME and in XDG_DATA_DIRS as described in ?the XDG Base
Directory Specification. XDG_DATA_HOME has a default value of $HOME/.local/share/.

    If TRANSMISSION_HOME is not set, Unix-based versions of Transmission will look
for their settings in $XDG_CONFIG_HOME/transmission/. XDG_CONFIG_HOME has a default
value of $HOME/.config/.

    If HOME is set, it's used in three ways:
        by the XDG variables, as described above
        If TRANSMISSION_HOME is not set, Mac-based versions of Transmission will look
for their settings in $HOME/Library/Application Support/Transmission
        $HOME/Downloads is the default download directory.

Standard Variables Used By Other Tools

    Transmission uses the ?libcurl library for http- and https-based tracker
announces and scrapes. Transmission doesn't support proxies, but libcurl itself
honors ?a handful of environment variables to customize its proxy behavior.