[Bug 12551] New: dpkg remove (and update) destroys symlinks to directories

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=12551

            Bug ID: 12551
           Summary: dpkg remove (and update) destroys symlinks to
                    directories
           Product: Busybox
           Version: 1.33.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: nolange79 at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

the target installation has a symlink lib -> usr/lib.
The deb archive contains a file './lib/systemd/system/a.service'

When removing (update does remove the old packet as well), dpkg will do the
following:

lstat("/.", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
rmdir("/.")                             = -1 EINVAL (Invalid argument)
lstat("/lib", {st_mode=S_IFLNK|0777, st_size=7, ...}) = 0
unlink("/lib")                          = 0
lstat("/lib/systemd", 0x7ffe2f87b8d0)   = -1 ENOENT (No such file or directory)
lstat("/lib/systemd/system", 0x7ffe2f87b8d0) = -1 ENOENT (No such file or
directory)

That leads two 2 problems:

1.  the /lib symlink is now gone, rendering the system unusable.
2.  cleanup is done bottom up, means in this case it fails to remove everything
else.

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