790005cdfa
Introduce two new properties for page nodes to allow for declaratively
specifiying system dependencies which is useful to e.g. make certain
views depend on specific uci values or the presence of certain files.
The recognized properties are:
- `uci_depends` - a nested table in one of the following forms:
1) `{ config = { section = { option = "exact_value" } }`
2) `{ config = { section = { option = true } }`
3) `{ config = { section = "exact_type" } }`
4) `{ config = { section = true } }`
5) `{ config = true }`
Depending on the declaration, the uci option or section type must either
match the given "exact_value" or "exact_type" values or be a non-nil value
in case boolean "true" is specified.
- `file_depends` - a flat lists of file paths that must be accessible
If a path listed in `file_depends` points to a directory, that directory
must be not empty, otherwise it suffices if the path exists.
Examples:
- Only display the node if an /etc/config/wireless file exists with
a "config wifi-device radio0" section.
node = page(...)
node.uci_depends = { wireless = { radio0 = "wifi-device" } }
- Only display the node when swconfig is installed.
node = page(...)
node.file_depends = { "/sbin/swconfig" }
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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