Create an invoke_in_rootfs function in command_lib #52
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To enable debugging a container image layer by layer, we will add a function to invoke command snippets in a chroot environment assuming the root filesystem has already been laid out - Separated formatting of the snippets in a separate function called collate_snippets - Added new function called invoke_in_rootfs which follows the same procedure as invoke_in_container except using the rootfs utilities - Modified the run_chroot_command in utils/rootfs.py to put the root_command call in a try-except loop so invoke_in_rootfs can catch it Resolves tern-tools#52 Signed-off-by: Nisha K <nishak@vmware.com>
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Based on the work in #37, we should now be able to do the same operations as in 'invoke_in_container'
No 'override' should be necessary as there is only one location that the rootfs should exist and no running process to refer to.
Refer to #37 for more info.
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