Author: Colin Watson
Author Date: 2019-01-13 22:55:35 UTC

Avoid cleanup problems in chroots

Don't enable formats on import or disable them on unimport unless
/proc/sys/fs/binfmt_misc is already mounted.

Fixes Debian bug #847788 and Ubuntu bug #534211.

* src/update-binfmts.c (is_enabled): New function.
(load_binfmt_misc): Use is_enabled rather than equivalent code.
(act_install): Add always_update_kernel argument. Only enable/disable
if always_update_kernel or if binfmt_misc is already enabled.
(act_remove): Add always_update_kernel argument. Only disable if
always_update_kernel or if binfmt_misc is already enabled.
(act_import, act_unimport, main): Adjust calls to act_install and
act_remove.
* NEWS: Document this.