reinstalling debian /bin

[kramerjm at gmail.com (James Kramer)]

Everyone Thanks for the help.  I will try the advice this weekend.
Jay

On 9/19/06, Alex Pennace <alex at pennace.org> wrote:
> On Sun, Sep 17, 2006 at 01:53:35PM -0400, James Kramer wrote:
> > While working on Xen setup I managed to delete /bin  by using the command
> > rm -R /bin. I don't think that I can recover the /bin files but I
> > should be able to reinstall the packages. I have a backup of all my
> > data files and most config files that were in /etc.  I can boot into a
> > different debian OS using grub so I can access the partition and
> > files.  I can chroot the particular partition.  Can someone suggest
> > how to reinstall the system.  If I do a complete debian reinstalll
> > from CD on top the partition would it retain my old directories and
> > files.  I tried to chroot the root partion figuring that I could use
> > apt-get to reinstall the packages but I can not figure out the proper
> > way to do it.
>
> You are going to encounter a chicken-and-egg scenario that is not
> going to be easy to back out of. The problem is many, many packages
> depend/predepend on programs in /bin. It is probably that an apt-get
> --reinstall will fail due to the missing files.
>
> "dpkg -S /bin" will list most packages that have files in /bin. (If
> the root directory in question is under /mnt, use "dpkg --root=/mnt -S
> /bin".) The files that are missed would be files created by package
> maintainer scripts instead of being unpacked through dpkg. This is
> almost a non-issue for /bin, but would be an issue for most other
> directories.
>
> Gather up the corresponding debs. For each deb, run dpkg -x (deb)
> (tmpdir). Copy over the files in (tmpdir)/bin into the target's
> /bin. Check the target's /bin/sh; make it a symlink to bash if it
> isn't already.
>
> You now have a Debian system that is 95% of the way to being
> whole. Boot into it and run apt-get --reinstall install (packages in
> question).
>
> As hinted above, there may be packages that do not unpack any files
> into /bin (and thus won't appear in dpkg -S /bin), but have maintainer
> scripts that create files in /bin behind dpkg's back. If you are
> truely concerned about that, then apt-get --reinstall install all the
> packages on the system. Be warned that this can cause other problems:
> It calls the maintainer scripts for every package, and some of them
> are not idempotent.
>

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