Code review comment for ~chad.smith/cloud-init:tests-fix-root-os-access-leak

I'm not quite sure what we should do here. You are right that root user will likely never see os.access(W_OK) as False because root's a privileged user so the perms don't matter.

Also, it seems that in containers we fail to resize up at cc_resizefs line 197 on ENOENT so generally trying to account for is_container checks below in the os.access and stat.S_ISBLK
conditionals feel like wasted logic. We could just check mode values instead of os.access like this:

os.stat(devpath).st_mode & (stat.S_IROTH | stat.S_IRGRP| stat.S_IRUSR)
I know there must be a better way here.

But ultimately, do you know if there are device files that would be read only for root?