Bug#659955: update-rc.d: add option to specify alternative root (like insserv -p)

[Dmitry Bogatov]

[ I believe this bug should be reassigned to bin:insserv, if current
  maintainer of bin:init-system-helpers agree. ]

[2012-02-15 11:33] Peter Eisentraut <petere at debian.org>
> part       text/plain                 238
> Package: sysv-rc
> Version: 2.88dsf-22
> Severity: wishlist
> 
> Please add an option like insserv -p or chkconfig --root to specify an
> alternative root for the init scripts.  This would be useful for
> testing and for fixing other file systems.

According to insserv(8), it must be possible (insserv=1.18.0):

       [[/]path/to/init.d/]
              Relative or absolute path to the init  scripts  base  directory.
              This  defaults to /etc/init.d/ in compliance with the LSB speci‐
              fication.  In this case insserv does not add or remove a  script
              to  the  runlevels  declared  in  the  script  headers,  but may
              re-order the runlevels if the order  of  the  currently  enabled
              scripts  has  changed  (see option -d).  Note that if a relative
              path is used insserv has to be called from the root directory.

but I failed to make use of it:

	$ mkdir /tmp/temp-1
	$ cp -r /etc/init.d .
	$ /sbin/insserv init.d
	$ ls
	init.d rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d rcS.d
	$ find -empty
	./rcS.d
	./rc6.d
	./rc5.d
	./rc4.d
	./rc3.d
	./rc2.d
	./rc1.d
	./rc0.d

Jesse, am I holding it wrong?