[Bug 575469] Re: recovery mode mounts filesystems read-write rather than read-only

[Stéphane Graber]

Ok, so I have the initial implementation of the fix.

The current chosen solution is:
 - Move friendly-recovery to /lib/recovery-mode
 - Make it ship its own upstart job starting on "recovery-mode"
 - Update initramfs-tools to support a new boot parameter "startup-event" that's passed to init
 - Update grub2 to have update-grub set startup-event=recovery-mode instead of setting "single" for recovery entries
 - Update upstart to stop calling friendly-recovery from its rcS.conf job

I also updated all the scripts that generate output to wait for user confirmation before going back to the menu.
I introduced a new "remount" script that will trigger mountall to remount all the filesystems in read-write mode.
The "fsck" script has also been changed to no longer require a reboot and to simply trigger the "remount" script but forcing fsck.

Complete changelog for friendly-recovery is:
  * Move everything to /lib/recovery-mode/ (LP: #xxxxxx)
  * Don't use the fullpath to whiptail
  * Small packaging refresh:
    - Bump standard to 3.9.2, no change needed
    - Drop simple patchsys (no patches)
    - No need to depend on bash (essential package)
    - Add ${misc:Depends} to dependencies
  * Add new init script starting on recovery-mode
  * If whiptail can't be found, just start sulogin
  * Add a script to start mountall (remount everything read/write)
  * Export READONLY to all scripts so they can test on the read/write state
  * Disable most scripts when the system is read only
  * Change file system check to happen when remount is called
  * Wait after all scripts returning output so the user can read it


Test packages are available in my experimental PPA at: https://launchpad.net/~stgraber/+archive/experimental
(please note it might take a while until everything is done building)

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https://bugs.launchpad.net/bugs/575469

Title:
  recovery mode mounts filesystems read-write rather than read-only

Status in “friendly-recovery” package in Ubuntu:
  Confirmed
Status in “newt” package in Ubuntu:
  Invalid
Status in “friendly-recovery” source package in Oneiric:
  Confirmed
Status in “newt” source package in Oneiric:
  Invalid

Bug description:
  Binary package hint: friendly-recovery

  In recovery mode, filesystems should probably be mounted read-only,
  since pending any problems they can safely be remounted read-write,
  while the reverse is not necessarily true.  This means that operations
  such as fsck, badblocks, zerofree, etc. are not possible without
  having to use a boot CD, and ensuring that any additional binaries are
  compatible.  One should assume that booting into recovery mode is
  either deliberate or has come about because of a problem.

  f-r 0.2.10 on lucid/2.6.32-21-generic

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