[Bug 476161] A workaround for no recovery shell

[Luke]

I have written a workaround for any of the various "no recovery shell" bugs. It's not perfect as you have to reboot in single-suer mode to use it(and again for a root filesystem error correction), but it allows you to recover without booting from another device. It looks for the word "single" on /proc/cmdline, and if it is present stops mountall, opens a recovery shell, and restarts mountall on exiting the shell. It basically does what mountall-shell.conf would do if it caught the stopped mountall signal.

Cut and paste the text below, save it as "recovery-shell.conf" and drop
it into /etc/init .

# Recovery shell-opens shell BEFORE Mountall starts
author "Luke"
description    "Bugfix-Recovery shell for single user mode,to recover from failed boots"

start on startup


task
console owner

script
        if test $(grep single /proc/cmdline | head -c 4) ; then
        
        initctl stop mountall
        usplash_write "QUIT"
        setupcon
    echo "A Root Shell will now be started for recovery."
        sulogin
        exec start --no-wait mountall
        fi
end script
 		 	   		  
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-- 
Recovery shell does not spawn if mountall stopped by esc (mountall 1.0)
https://bugs.launchpad.net/bugs/476161
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