Add a check for the existence of files provided in iso_paths before starting a build.

[tenthirtyam]

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Description

A .iso file can be provided at an input to iso_paths where the file name may not exist or has been provided with an incorrect case. In such an instance, the CD-ROM will be added but will not connect to the media, resulting in the build failing.

Use Case(s)

Ensure that builds do not proceed if the media can not be found on the data store.

Potential Configuration

Add a check in the Prepare() for step_add_cdrom.go to ensure that the file name provided exists on the datastore before running the build. If the file does not exist, append an error message.

References

#452