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create: explain file header length logic

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Anatoli Babenia 2025-05-30 10:57:53 +03:00
parent d860fa1fa8
commit 87e57368d4
1 changed files with 4 additions and 1 deletions
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5
Library/Homebrew/formula_creator.rb
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@ -84,7 +84,10 @@ module Homebrew
r.owner = self
filepath = r.fetch
html_doctype_prefix = "<!doctype html"
if File.read(filepath, 100).strip.downcase.start_with?(html_doctype_prefix)
# Number of bytes to read from file start to ensure it is not HTML.
# HTML may start with arbitrary number of whitespace lines.
head_len = 100
if File.read(filepath, head_len).strip.downcase.start_with?(html_doctype_prefix)
raise "Downloaded URL is not archive"
end