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1ba2080046
KWin for wayland uses the `.desktop` file to determine whether a process
is allowed to access some wayland services.
This would be fine if there was a stable interface to map a process to a
`.desktop` file.
Since there is no such interface, they are scanning `.desktop` files for
one where the executable path matches the resolved file "exe" from
`/proc/$PID/exe`.
This would be fine, if we didn't wrap many (most?) KDE/Plasma binaries.
Since we are wrapping binaries, the `exe` symlink points to a wrapped
binary. No `.desktop` file will match for the wrapped binary.
The solution here is to peel away at the `.${name}-wrapped` layers until
we have the intended name for the executable.
It is expected that no `.desktop` file will ever point to a wrapped
binary.
58 lines
3 KiB
Diff
58 lines
3 KiB
Diff
From 29ec6fada935ef966e5859082435ed57daa9522d Mon Sep 17 00:00:00 2001
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From: Samuel Dionne-Riel <samuel@dionne-riel.com>
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Date: Tue, 16 Mar 2021 15:03:59 -0400
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Subject: [PATCH] [NixOS] Unwrap executable name for .desktop search
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Why is this necessary even though -a "$0" is used in the wrapper?
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Because it's completely bypassing argv0! This looks at the executable
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file in-use according to the kernel!
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Wrappers cannot affect the `/proc/.../exe` symlink!
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---
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service_utils.h | 28 +++++++++++++++++++++++++++-
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1 file changed, 27 insertions(+), 1 deletion(-)
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diff --git a/service_utils.h b/service_utils.h
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index 8a70c1fad..6674f553b 100644
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--- a/service_utils.h
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+++ b/service_utils.h
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@@ -26,8 +26,34 @@ namespace KWin
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const static QString s_waylandInterfaceName = QStringLiteral("X-KDE-Wayland-Interfaces");
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const static QString s_dbusRestrictedInterfaceName = QStringLiteral("X-KDE-DBUS-Restricted-Interfaces");
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-static QStringList fetchProcessServiceField(const QString &executablePath, const QString &fieldName)
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+static QStringList fetchProcessServiceField(const QString &in_executablePath, const QString &fieldName)
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{
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+ // !! Start NixOS fix
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+ // NixOS fixes many packaging issues through "wrapper" scripts that manipulates the environment or does
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+ // miscellaneous trickeries and mischievous things to make the programs work.
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+ // In turn, programs often employs different mischievous schemes and trickeries to do *other things.
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+ // It often happens that they conflict.
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+ // Here, `kwin` tries to detect the .desktop file for a given process.
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+ // `kwin` followed the process `/proc/.../exe` up to the actual binary running.
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+ // It normally would be fine, e.g. /usr/bin/foobar is what's in the desktop file.
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+ // But it's not the truth here! It's extremely likely the resolved path is /nix/store/.../bin/.foobar-wrapped
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+ // rather than what the desktop file points to, something like /nix/store/.../bin/foobar !!
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+ // Since the wrappers for Nixpkgs *always* prepend a dot and append -wrapped, we assume here that we can keep
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+ // `/^(.*)\/\.([^/]*)-wrapped/` until the (equivalent) regex does not match.
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+ // This should canonicalize the wrapper name to the expected name to look for in the desktop file.
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+
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+ // Use a copy of the const string
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+ QString executablePath(in_executablePath);
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+
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+ // While the parts needed are present, "unwrap" one layer of wrapper names.
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+ while (executablePath.endsWith("-wrapped") && executablePath[executablePath.lastIndexOf("/")+1] == QChar('.')) {
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+ // Approximately equivalent to s/-wrapped$//
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+ executablePath.remove(executablePath.length() - 8, 8);
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+ // Approximately equivalent to s;/\.;/;
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+ executablePath.remove(executablePath.lastIndexOf("/")+1, 1);
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+ }
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+ // !! End NixOS fix
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+
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// needed to be able to use the logging category in a header static function
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static QLoggingCategory KWIN_UTILS ("KWIN_UTILS", QtWarningMsg);
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const auto servicesFound = KApplicationTrader::query([&executablePath] (const KService::Ptr &service) {
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--
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2.28.0
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