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Use readlink instead of realpath so find_exe works for flatpaks #136

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merged 2 commits into from May 7, 2019

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gicmo
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@gicmo gicmo commented May 2, 2019

Currently to find the executable for a game, a call to realpath(3) of /proc//exe is made. The realpath(3) call will fail if the target does not exist (internally realpath will stat all the components of the link target path). This is a problem in the case of sandbox applications where the exe points to the absolute path inside the sandbox, e.g. to /app/bin/ in the case of flatpak. For these cases realpath(3) will then fail. Therefore use readlink(3) instead.

I have omitted the call to stat for the target because I am not sure it is necessary (and most likely the target will exist, because it just requested gamemode). I can add it though. Also by using readlink(3) we lose the ability to resolve names with .. components but for our use case that should not matter.

gicmo added 2 commits May 2, 2019
Add a inline helper function and a helper macro to be able to
automatically close file descriptors. Does nothing if the argument
is NULL or the pointed to integer is < 0.
The realpath(3) will fail if the target does not exist (internally
realpath will stat all the components of the link target path).
This is a problem in the case of sandbox applications where
the exe points to the absolute path *inside* the sandbox, e.g. to
/app/bin/<name> in the case of flatpak. For these cases realpath(3)
will then fail. Therefore use readlink(3) instead.
@gicmo gicmo changed the title Sandbox root Use readlink instead of realpath so find_exe works for flatpaks May 2, 2019
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gicmo commented May 2, 2019

This is part of the ongoing efforts to make GameMode work with flatpak (see flathub/com.valvesoftware.Steam#77).

@aejsmith aejsmith merged commit d801fe1 into FeralInteractive:master May 7, 2019
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aejsmith commented May 7, 2019

LGTM, thanks!

@gicmo gicmo deleted the sandbox_root branch May 7, 2019
afayaz-feral pushed a commit that referenced this issue May 26, 2020
Use readlink instead of realpath so find_exe works for flatpaks
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2 participants