[Pkg-sysvinit-devel] Bug#697002: [PATCH initramfs-tools 0/5] Only mount /usr if the real init is systemd

[Ben Hutchings]

Currently initscripts will not work correctly if /usr is mounted by
initramfs-tools.  Firstly, fsck will fail and the boot process will
stop.  If you press Ctrl-D to continue, the boot process will succeed
but /usr will not be remounted read-write if necessary.

upstart (or mountall) and wheezy's version of systemd also fail to
remount /usr as read-write.

This issue *must* be fixed *now*.  I am extremely annoyed that this
delicate change has been handled so badly and I intend to upload some
kind of fix by the end of this week.

My current ugly fix is to mount /usr if init is systemd, and add a
versioned Breaks to ensure systemd is upgraded if necessary.  The actual
fix might not look quite like this:

* If there is a fixed initscripts and/or util-linux available then the
check for systemd can be replaced with a versioned Breaks on
initscripts.

* As for upstart, since it installs /sbin/init I don't see a way to
distinguish it from sysvinit.  So if initscripts is fixed and upstart is
not then I'm afraid I may have to add an unversioned Breaks: upstart.
If they are both fixed, then that can be another versioned Breaks:.

* If anyone can present a better solution (not an idea, not a plan, but
an actual implementation), I would be very happy because this one is not
at all nice.  (Aside from 'init: Fix validation of the real init
program' which is a bug fix in its own right.)

Ben.

Ben Hutchings (5):
  init: Decide what the real init is immediately before mounting /usr
  init: Fix validation of the real init program
  init: Resolve both absolute and relative symlinks in validate_init
  init: Only mount /usr if the real init is systemd
  debian/control: Add Breaks: systemd-sysv (<< 186)

 debian/control |  2 +-
 init           | 90 ++++++++++++++++++++++++++++------------------------------
 2 files changed, 44 insertions(+), 48 deletions(-)


-- 
Ben Hutchings
Logic doesn't apply to the real world. - Marvin Minsky
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