overlay: change to normalized, fix error handling
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@ -2,6 +2,8 @@ local fs = require "nixio.fs"
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local opkg = require "luci.model.ipkg"
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local st = fs.statvfs(opkg.overlay_root())
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local used = 100*((st.blocks - st.bfree) / st.blocks) or 0
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local blocks = st.blockss or 0
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local bfree = st.bfree or 0
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local used = ((blocks - bfree) / blocks)
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return math.floor(used * 1000 + 0.5) / 1000
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