jdx/mise · error · RuntimeError

formula declares a DATA patch but has no __END__ section

Error message

formula declares a DATA patch but has no __END__ section

What it means

The shim's Patch apply! supports DATA patches, which store the patch content after the formula file's __END__ marker. It raises when a patch was declared as DATA (@data = true) but the formula file contains no __END__ section, so there is no patch content to extract.

Source

Thrown at src/system/packages/brew/shim.rb:461

  def url(url = nil, **)
    @url = url unless url.nil?
    @url
  end

  def sha256(sha = nil)
    @sha256 = sha unless sha.nil?
    @sha256
  end

  def data!
    @data = true
  end

  def apply!
    if @data
      content = @formula_file.read.split(/^__END__$/, 2)[1]
      raise "formula declares a DATA patch but has no __END__ section" if content.nil?
      apply_content(content.sub(/\A\n/, ""))
    elsif @url
      file = MiseDownload.fetch(@url, @sha256, "patch")
      apply_content(file.read)
    end
  end

  private

  def apply_content(content)
    ohai "Applying patch (-p#{@strip})"
    Open3.popen2e("patch", "-g", "0", "-f", "-p#{@strip}") do |stdin, out, thread|
      stdin.write(content)
      stdin.close
      output = out.read
      raise "patch failed:\n#{output}" unless thread.value.success?
      $stdout.puts output
    end

View on GitHub (pinned to afd2eddd3a)

Solutions

1. Append __END__ to the formula file followed by the patch content
2. Move the patch to a url-based patch (`patch do url ... end`) if inline data isn't wanted
3. Check the formula file wasn't truncated during copy/download

Example fix

# before
def patch
  patch :data
end
# (file ends here)
# after
def patch
  patch :data
end
__END__
--- a/src/config.c
+++ b/src/config.c
@@ -1,3 +1,3 @@
-OLD
+NEW

raise "DATA patch without __END__" if patch_data && !formula_file.read.include?("__END__")

When it happens

Trigger: A formula declares `patch :data` but the file lacks `__END__` followed by the unified diff; formula was truncated when copied; patch DSL mismatch where content was expected inline after __END__.

Common situations: Hand-copied formulas missing the trailing patch text; editors or linters stripping content after __END__; formula ports from Homebrew where the DATA patch section was dropped.

Understand the failure class

Background: "must not be empty", "cannot be empty" — required-field validation errors across open-source libraries — this error's family across 41 libraries.

Related errors

• patch failed:\n#{output}
• undefined resource #{name.inspect}
• inreplace: missing before/after
• inreplace in #{path} made no substitutions — the formula may
• no precompiled ruby is available for this platform To compil

AI-assisted analysis of jdx/mise@afd2eddd3a (2026-09-09). Data as JSON: /api/errors/eaa12c6b8385a1ad. Report an issue: GitHub.