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Verify that there is at least 1.6Gb of usable RAM on the system. Swap is not considered. While swap would allow a user to minimally install IPA it would not be a great experience. Using any proc-based method to check for available RAM does not work in containers unless /proc is re-mounted so use cgroups instead. This also handles the case if the container has memory constraints on it (-m). There are envs which mount 'proc' with enabled hidepid option 1 so don't assume that is readable. Add a switch to skip this memory test if the user is sure they know what they are doing. is_hidepid() contributed by Stanislav Levin <slev@altlinux.org> https://pagure.io/freeipa/issue/8404 Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com> Reviewed-By: Stanislav Levin <slev@altlinux.org>