Description of problem:
mock doesn't create /etc/hosts because the following code that would build the
path to /etc/hosts and write it inside the chroot-ed environment

        for key in filedict:
            p = os.path.join(self.rootdir, key)
            if not os.path.exists(p):
                # write file


refers to /etc/hosts from the host environment, not to /etc/hosts from the
chroot-ed environment.

I learned that os.path.join ignores the arguments that appear before absolute
paths. In this case 'key' contains the value '/etc/hosts', so self.rootdir is
ignored and the path returned is /etc/hosts.


Version-Release number of selected component (if applicable):
mock-0.7.4-1.fc7


How reproducible:
Always


Steps to Reproduce:
1. mock -r fedora-7-i386 init

  
Actual results:
$ ls -l /var/lib/mock/fedora-7-i386/root/etc/hosts
ls: cannot access /var/lib/mock/fedora-7-i386/root/etc/hosts: No such file or
directory


Expected results:
$ ls -l /var/lib/mock/fedora-7-i386/root/etc/hosts
-rw-rw-r-- 1 rpmb mock 49 2007-08-21 03:05
/var/lib/mock/fedora-7-i386/root/etc/hosts


Additional info:
A workaround is to use config_opts['files']['etc/hosts'], but even mock uses
'/etc/hosts' when it sets the default.

Although I don't know Python, I found that the code be changed to work in both
cases, when either '/etc/hosts' or 'etc/hosts' is used.