Is there a default method in OpenWRT to check if any USB storage is mounted and available for writing. I would like to write to USB Storage if is present or show an error message in Luci interface warning the users.
Searching through the docs, I found this snippet.
https://oldwiki.archive.openwrt.org/doc/howto/usb.storage#disable_writing_when_not_mounted
afaik no, the only thing is hotplug events when the USB/Sata/whatever is inserted or removed, so you probably just have to create a dummy file in the USB and check if the file exists, or do it in the mount folder on the main storage as explained in that old doc.
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