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d8535f9a50
- the scanout dma-buf fd is duplicated with F_DUPFD_CLOEXEC. `dup(2)` never copies close-on-exec, so this fd was inherited by every child the ROOT service forks (it forks synchronously for the loginctl active-uid lookup) - and what this fd names is the live screen contents. this is the SAME defect already closed on the `_drm` socket fd in ipc/drm.rs; fixing that one and not grepping for the siblings is how this survived. there is exactly one dup in the drm path now and it is this one, verified by grep. measured that F_DUPFD_CLOEXEC sets FD_CLOEXEC and preserves the O_RDONLY access mode the read-only export depends on; SCM_RIGHTS delivery is unaffected since the receiver gets its own descriptor. - Desktop::refresh resolves HOME on the login-Wayland path too, since the drm build now starts a --server as the greeter uid there and a child with no HOME has nowhere to put its config. the compositor variables stay blank deliberately: the drm path talks to the root service and a render node, never to the compositor or the portal, which is why it works at a login screen at all. reasoned, not measured: a current GDM runs its greeter as `gdm-greeter`, which `is_gdm_user` does not match, so that path is not reachable on our hardware - measured there, the greeter server gets a fully populated environment through the branch below. - the glibc-floor step globs into an array and asserts the count, like its sibling assert step. that sibling was fixed two rounds ago and this one was left behind.