Description of problem: When the "emergency" or "-b" flag is passed to the kernel as a parameter, init is supposed to spawn an emergency shell. With upstart, that doesn't happen, and bootup proceeds as normal. Version-Release number of selected component (if applicable): upstart-0.3.9-19.fc9 How reproducible: Always Steps to Reproduce: 1. At the boot-time grub prompt, hit "a" to append arguments. 2. Append "emergency" and hit enter. Actual results: System boots as if I hadn't added that argument. Expected results: An emergency shell, before the filesystems get mounted read/write. Additional info: The old sysvinit init also recognized other arguments ("-z", "-a") which upstart doesn't seem to support (unless it's just missing from the docs).
Is this really any different than just passing init=/bin/bash?
It is -- the bootup process continues after you exit the shell.
Hm, moving to initscripts as this would have to be done in the event setup, not upstart itself. As for -z and -a, I'm not seeing why they would be useful usage cases to implement.
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Folks, is anything ever going to happen about this? One reason to do something about this is that just about all searches to find out how to handle low level booting issues refers to using either '-b' and/or `emergency' to get a shell. This is even documented in the sulogin man page.
This is fixed in F-15 with systemd.