Allow pre-fetch of css files without attempting download #2095
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This PR allows for pre-fetching of css files (outside of the build system) without first attempting a download (which on some non-internet connected systems may cause the installation to hang indefinitely). Specifically, it rearranges the logic in hatch_build.py, checking to see whether the destination file exists before attempting a download (if the destination exists, then the
_get_css_filefunction returns). I have tested installing on internet-connected systems (i.e., the normal way), as well as on non-internet connected systems with the css files pre-fetched through Spack (as resources).Fixes #2093