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fix(keyboard): apply configured XKB layout in linuxfb lockdown mode - #37
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Check name Status Explanation Title check The title clearly and concisely describes the main change: applying the configured XKB keyboard layout in Linux framebuffer lockdown mode. Description check The description includes all required sections: Summary, What Changed, and Verification. It explains the issue, implementation, verification results, and build status. Linked Issues check Issue [ #36] requires the linuxfb lockdown shell to use the local system keyboard mapping instead of the US mapping. Insrc/main.cpp,applyKeyboardLayoutEnvironment()readslocalectl status, fall…Out of Scope Changes check The reviewed change is limited to keyboard-layout environment setup in src/main.cppand itsQFileinclude. The setup supports the linuxfb lockdown behavior required by issue [#36]. No unrelated fu…
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Actionable comments posted: 2
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Inline comments:
Review comments at @src/main.cpp:
- Line 263: Update the XKB_DEFAULT_LAYOUT check in the layout-detection flow to
return only when the environment variable has a nonempty value; allow an empty
value to continue to system detection.
- Line 293: Update the layout check in the `localectl status` handling so empty
values, `n/a`, and `(unset)` are all treated as missing before deciding whether
to read `/etc/default/keyboard`; do not export either placeholder as an XKB
layout.
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For the Debian/Ubuntu-style path this fallback targets, a valid /etc/default/keyboard can coexist with no systemd-localed X11 property, in which case localectl status reports X11 Layout: (unset) (the localectl documentation describes status as showing the current system keyboard mapping). The parser stores that literal sentinel, so this condition skips the file fallback, and isUsable() later rejects it; consequently no XKB_DEFAULT_LAYOUT is exported and linuxfb still defaults to US. Treat (unset) as missing before deciding whether to read the file.
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Good catch, fixed in 626b6a0. Values from localectl are now only accepted when usable ((unset) / n/a / empty are rejected), so the /etc/default/keyboard fallback is reached and nothing is exported when no layout can be determined.
| if (qEnvironmentVariableIsSet("XKB_DEFAULT_LAYOUT")) { | ||
| return; |
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When the user's session already provides XKB_DEFAULT_LAYOUT (and variant/model/options), the normal locked launch reaches this check only in the elevated child. Both pkexec builders at lines 575-585 and 616-630 omit all XKB variables; pkexec(1) states that PROGRAM receives “a minimal known and safe environment”, so those overrides are stripped. The child then reads the machine-wide layout instead of honoring the explicit session override, so forward all four variables in both relaunches.
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Done in 626b6a0: all four XKB_DEFAULT_* variables are now forwarded through both pkexec relaunches, so an explicit session-provided override is preserved for the elevated process (no-op when the variable is unset).
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Thanks for the reviews. Addressed the valid points in 626b6a0:
Verification (small harness reproducing the detection logic):
Builds cleanly with make ( |
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Can you move this to the v2 branch? We are currently working on releasing v2. |
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V1 my bad. |
The barebones VT switches Qt to the "linuxfb" platform. Its keyboard handlers (libinput/xkbcommon, or the evdev fallback) do not read the layout configured for the desktop session, so xkbcommon falls back to its built-in "us" default and an azerty session ends up with a qwerty keyboard. Detect the configured layout (localectl, falling back to /etc/default/keyboard) and export XKB_DEFAULT_LAYOUT/VARIANT/MODEL/OPTIONS before the QPA platform is initialized.
Address review feedback: - Only skip detection when XKB_DEFAULT_LAYOUT is set to a non-empty value; an empty override must still fall through to system detection. - Treat "(unset)" and "n/a" from localectl as absent so the /etc/default/keyboard fallback still runs (previously the placeholder suppressed the fallback and nothing was exported). - Forward XKB_DEFAULT_* through both pkexec relaunches so an explicit session-provided override is preserved for the elevated process.
626b6a0 to
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Moved to The branch is now rebased onto New commits: |
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You still got a conflict. |
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@Jvr2022 The conflict you saw was a stale mergeability cache on the GitHub side, not a real one. When the base moved to Reopening the PR forced a recomputation and it now reports MERGEABLE (a refresh on your side should show it). The diff is limited to |
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LGTM! This is planned for Seb-Linux v1.0.0 |
Summary
What Changed
localectl status, falling back to/etc/default/keyboard) and exportXKB_DEFAULT_LAYOUT/XKB_DEFAULT_VARIANT/XKB_DEFAULT_MODEL/XKB_DEFAULT_OPTIONSright whereQT_QPA_PLATFORMis switched tolinuxfb, i.e. before the QPA platform and its input handlers are initialized.Verification
XKB_DEFAULT_LAYOUT=frandXKB_DEFAULT_VARIANT=latin9it resolves to "French (legacy, alt.)" (checked with a small xkbcommon test program).linuxfbuses libinput + xkbcommon by default (QLinuxFbIntegration::createInputHandlers), andQLibInputKeyboardcallsxkb_keymap_new_from_names(ctx, nullptr, ...), so it honors these variables.fr/latin9/pc105on a Debian host with/etc/default/keyboardconfigured accordingly../scripts/build.sh.Summary by CodeRabbit