resilient location: fall back to SAM lookup if file not found on resi…#28
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resilient location: fall back to SAM lookup if file not found on resi…#28
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…lient dCache Mirrors the stash fallback logic: check os.path.exists() first, and if the file is not on resilient, fall through to SAM-based location lookup.
os.path.exists() is unreliable for resilient dCache — POSIX is not available on grid worker nodes. Use gfal2 Python bindings to stat the xrootd URL, which works on both interactive nodes and grid. Falls back to SAM lookup if the file is not found or gfal2 fails.
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…lient dCache
Mirrors the stash fallback logic: check os.path.exists() first, and if the file is not on resilient, fall through to SAM-based location lookup.