Mount the RHCOS image and copy content.

content.sh

[prkumar@local image]$ pwd
/home/prkumar/.cache/openshift-install/libvirt/image

[prkumar@local image]$ ll
total 8429340
-r--r--r--. 1 prkumar prkumar 1762721792 Nov 12 12:02 5d9e7ad6af87c256f0729ba0b8fcab21
-r--r--r--. 1 prkumar prkumar 1760821248 Nov  1 12:01 7722a0531a376a927e7dbd7fac58b2c9
-r--r--r--. 1 prkumar prkumar 1673003264 Oct 22 11:49 b94474a2755fe45df7bd856789d830c9
-r--r--r--. 1 prkumar prkumar 1762000896 Nov  9 10:25 c9fc84b57c827093733a9c77baabf94b
-r--r--r--. 1 prkumar prkumar 1673068800 Oct 18 13:53 de7ed838459359368283c7926c81dd73

[prkumar@local image]$ guestfish --ro -a 5d9e7ad6af87c256f0729ba0b8fcab21 

Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.

Type: ‘help’ for help on commands
      ‘man’ to read the manual
      ‘quit’ to quit the shell

><fs> run
><fs> list-filesystems
/dev/sda1: xfs
/dev/sda2: xfs
><fs> mount /dev/sda1 /
><fs> ls /
coreos-firstboot
grub2
loader
loader.0
ostree
><fs> ls /ostree/redhat-coreos-maipo-5586d69a8bedecf41ba9c80fbf97b2c1663d1ee0a7ef9f4aed1e6ccf8ec0440a/
initramfs-3.10.0-862.14.4.el7.x86_64.img
vmlinuz-3.10.0-862.14.4.el7.x86_64
><fs> copy-out /ostree/redhat-coreos-maipo-5586d69a8bedecf41ba9c80fbf97b2c1663d1ee0a7ef9f4aed1e6ccf8ec0440a/vmlinuz-3.10.0-862.14.4.el7.x86_64 /home/prkumar/Public
><fs> copy-out /ostree/redhat-coreos-maipo-5586d69a8bedecf41ba9c80fbf97b2c1663d1ee0a7ef9f4aed1e6ccf8ec0440a/initramfs-3.10.0-862.14.4.el7.x86_64.img /home/prkumar/Public
><fs> exit