Environment variables¶

Deucalion works without any of these. They are for special cases, scripts and development.

Variable	Effect
`NO_COLOR`	Any value: no colours in the terminal output.
`DEUCALION_DEBUG`	Any value: on an unexpected error, show the full Python error instead of a short message.
`DEUCALION_CONFIG_DIR`	Folder for `config.json` instead of `~/.config/deucalion`.
`DEUCALION_STATE_DIR`	Folder for working files instead of `~/.local/state/deucalion`.
`XDG_CONFIG_HOME`, `XDG_STATE_HOME`	Standard locations; used when the two above aren't set.
`DEUCALION_PASSWORD_STDIN`	Any value: read backup passwords from standard input (one line each) instead of asking in the terminal. See Use Deucalion without a desktop.
`VISUAL`, `EDITOR`	The editor `deucalion config edit` opens (default `nano`).
`DEUCALION_ALLOW_ROOT`	Any value: allow running as root. Not recommended; Deucalion asks for administrator rights itself.

For tests¶

Variable	Effect
`DEUCALION_TEST_EXFAT`	A mounted exFAT folder: also run the test suite on a real exFAT volume.
`DEUCALION_TEST_UDISKS`	Any value: also run the LUKS drive-setup test on a disk image (needs a desktop session).

These are only read when DEUCALION_SCREENSHOT_DIR is set; see Documentation and screenshots.

Variable	Effect
`DEUCALION_SCREENSHOT_DIR`	Folder to save screenshots in. Turns screenshot mode on.
`DEUCALION_SCREENSHOT_PAGES`	What to show and photograph, as a list of entries.
`DEUCALION_SCREENSHOT_WAIT`	Default wait before each picture, in milliseconds (1200).
`DEUCALION_SCREENSHOT_SIZE`	Window size, e.g. `1024x760`.
`DEUCALION_SCREENSHOT_THEME`	`light` or `dark`.
`DEUCALION_SCREENSHOT_FONT`	Font (default `Ubuntu Sans 11`).