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Document global clipboard for GUI protocol 1.8

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According to: https://github.com/QubesOS/qubes-gui-daemon/pull/150#issuecomment-2431883322
According to: https://github.com/QubesOS/qubes-gui-daemon/pull/150#issuecomment-2432486669
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Ali Mirjamali 2024-10-27 15:57:04 +03:30
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developer/system/gui.md
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@ -90,9 +90,10 @@ Clipboard sharing implementation
Certainly, it would be insecure to allow AppVM to read/write the clipboards of other AppVMs unconditionally. Certainly, it would be insecure to allow AppVM to read/write the clipboards of other AppVMs unconditionally.
Therefore, the following mechanism is used: Therefore, the following mechanism is used:
- there is a "qubes clipboard" in dom0 - its contents are stored in a regular file in dom0. - there is a "qubes clipboard" in dom0 - its contents are stored in a regular file in dom0 as `/run/qubes/qubes-clipboard.bin`.
- if the user wants to copy local AppVM clipboard to qubes clipboard, she must focus on any window belonging to this AppVM, and press **Ctrl-Shift-C**. This combination is trapped by `qubes-guid`, and `CLIPBOARD_REQ` message is sent to AppVM. `qubes-gui` responds with `CLIPBOARD_DATA` message followed by clipboard contents. - if the user wants to copy local AppVM clipboard to qubes clipboard, she must focus on any window belonging to this AppVM, and press **Ctrl-Shift-C**. This combination is trapped by `qubes-guid`, and `CLIPBOARD_REQ` message is sent to AppVM. `qubes-gui` responds with `CLIPBOARD_DATA` message followed by clipboard contents.
- the user focuses on other AppVM window, presses **Ctrl-Shift-V**. This combination is trapped by `qubes-guid`, and `CLIPBOARD_DATA` message followed by qubes clipboard contents is sent to AppVM; `qubes-gui` copies data to the local clipboard, and then user can paste its contents to local applications normally. - the user focuses on other AppVM window, presses **Ctrl-Shift-V**. This combination is trapped by `qubes-guid`, and `CLIPBOARD_DATA` message followed by qubes clipboard contents is sent to AppVM; `qubes-gui` copies data to the local clipboard, and then user can paste its contents to local applications normally.
- a supplementary JSON metadata file will be saved as `/run/qubes/qubes-clipboard.bin.metadata` on global clipboard copy or paste actions. Explanation of each field is available in `xside.h` header file of `qubes-guid` under `clipboard_metadata` structure. While the output from `qubes-guid` is fully JSON compatible, the `qubes-guid` parser is limited. It expects line breaks after each key-value pair and only one key-value pair per line. Opening and closing curly braces should be on their own lines. There should be no leading white-space.
This way, the user can quickly copy clipboards between AppVMs. This way, the user can quickly copy clipboards between AppVMs.
This action is fully controlled by the user, it cannot be triggered/forced by any AppVM. This action is fully controlled by the user, it cannot be triggered/forced by any AppVM.