Local Repo not working with installroot

Hi,
I am trying to install some files from a local repo.

Here is my repo file:

[cdrom2]
name=cdrom2
baseurl=file:///media/cdrom
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7


I can execute the following command successfully:

yum --disablerepo=* --enablerepo=cdrom2 install coreutils

I am not able to execute the command:

yum --disablerepo=* --enablerepo=cdrom2 --installroot=/xyz
--releasever=/ install coreutils

The error message:

Error getting repository data for cdrom2, repository not found

Thanks