Update Library/Homebrew/formula_creator.rb
Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>
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@ -83,7 +83,8 @@ module Homebrew
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r.url(@url)
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r.owner = self
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filepath = r.fetch
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raise "Downloaded URL is not archive" if File.read(filepath, 100).strip.start_with?("<!DOCTYPE html>")
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html_doctype_prefix = "<!doctype html"
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raise "Downloaded URL is not archive" if File.read(filepath, html_doctype_prefix.length).downcase.start_with?(html_doctype_prefix)
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@sha256 = filepath.sha256
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end
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