[dracut] rd.shell won't work if "root=" is missing

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Hi,
 
i just stumbled upon a detail in dracut that i found surprising and appears as a small bug to me. 

If you boot a dracut image without giving a "root=" parameter (or e.g. a misspelled argument to that parameter) the system will _not_ drop you into a shell, even if rd.shell is set. IMHO this is not the expected behavior, as the manual says that rd.shell will drop you into a shell if rd.shell is set and no root is found. So i would suggest to change the "die()" function in the dracut-lib.sh and add a test for rd.shell in line 460 (getargbool 0 "rd.debug=" && emergency_shell) too. The system will already drop you in a shell if you have a "rd.debug" parameter set, but i think that rd.shell (and probably "rdshell" too) alone should be sufficient, as this is more convinient and less surprising.

I could prepare a patch, if you prefer that.

If this is not some kind of bug, you may call it a "wishlist item" and/or change the documentation accordingly.

kr
Tammo



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