25 lines
2.8 KiB
Markdown
25 lines
2.8 KiB
Markdown
Users can set environmental variables to override Transmission's default behavior and for debugging.
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## Transmission-Specific Variables
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* If `TRANSMISSION_HOME` is set, Transmission will look there for its settings instead of in the [default location](Configuration-Files.md#Locations).
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* If `TRANSMISSION_WEB_HOME` is set, Transmission will look there for the [Web Interface](Web-Interface.md) files, such as the JavaScript, HTML, and graphics files.
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* If `TR_CURL_SSL_NO_VERIFY` is set, Transmission will not validate SSL certificate for HTTPS connections when talking to trackers. See CURL's documentation ([CURLOPT_SSL_VERIFYHOST](https://curl.se/libcurl/c/CURLOPT_SSL_VERIFYHOST.html) and [CURLOPT_SSL_VERIFYPEER](https://curl.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html)) for more details.
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* If `TR_CURL_VERBOSE` is set, debugging information for libcurl will be enabled. More information about libcurl's debugging mode [is available here](https://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTVERBOSE).
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* If `TR_DEBUG_FD` is set to an integer, that integer is treated as a [file descriptor](https://en.wikipedia.org/wiki/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:
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```console
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$ export TR_DEBUG_FD=2
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$ transmission 2>runlog
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```
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* If `TR_DHT_VERBOSE` is set, Transmission will log all of the DHT's activities in excruciating detail to standard error.
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## Standard Variables Used by Transmission
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* If `TRANSMISSION_WEB_HOME` is _not_ set, non-Mac platforms will look for the [Web Interface](Web-Interface.md) files in `XDG_DATA_HOME` and in `XDG_DATA_DIRS` as described in [the XDG Base Directory Specification](https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables). `XDG_DATA_HOME` has a default value of `$HOME/.local/share/`.
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* If `TRANSMISSION_HOME` is _not_ set, Unix-based versions of Transmission will look for their settings in `$XDG_CONFIG_HOME/transmission/`. `XDG_CONFIG_HOME` has a default value of `$HOME/.config/`.
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* If `HOME` is set, it is used in three ways:
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1. By the `XDG` variables, as described above.
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2. If `TRANSMISSION_HOME` is _not_ set, Mac-based versions of Transmission will look for their settings in `$HOME/Library/Application Support/Transmission`.
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3. `$HOME/Downloads` is the default download directory.
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## Standard Variables Used by Other Tools
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* Transmission uses the [libcurl](https://curl.haxx.se/libcurl/) library for HTTP- and HTTPS-based tracker announces and scrapes. Transmission does not support proxies, but libcurl itself honors [a handful of environment variables](https://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTPROXY) to customize _its_ proxy behavior.
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