jdx/mise · error · RuntimeError

patch failed: #

Error message

patch failed:
#{output}

What it means

Patch#apply_content pipes patch text into the external `patch` tool (`patch -g 0 -f -p<strip>`) and raises with the tool's output when it exits non-zero. This means the unified diff did not apply cleanly to the source tree.

Solutions

1. Read the printed `patch failed:` output to find the failing hunk and file.
2. Regenerate the patch against the current source version.
3. Adjust the formula's patch strip level (`:p1` etc.) to match the diff's path prefixes.
4. Drop the patch if upstream already applied the change in the new version.

Example fix

# before
patch do
  url "https://example.com/fix-for-1.2.patch"
end
# after
# regenerate fix-for-1.3.patch against the new sources
patch :p0 do
  url "https://example.com/fix-for-1.3.patch"
end

begin
  patch.apply!
rescue RuntimeError => e
  raise unless e.message.start_with?("patch failed:")
  warn e.message  # includes patch tool output; regenerate or adjust strip
end

When it happens

Trigger: The patch's context lines no longer match the source (upstream code changed); the wrong -p strip level for the diff's paths; the file the patch touches doesn't exist; line-ending or whitespace differences (CRLF vs LF).

Common situations: Formula updated to a new upstream version where an old patch no longer applies; patches generated with different path prefixes; Windows checkouts altering line endings before patching.

Related errors

• command failed: #
• completion generation failed: #
• formula declares a DATA patch but has no __END__ section
• patch failed:\n#
• cannot install # : does not exist

AI-assisted analysis of jdx/mise@533346cc37 (2026-09-17). Data as JSON: /api/errors/82d551ff121b6d13. Report an issue: GitHub.

Appendix: source

Thrown at src/system/packages/brew/shim.rb:477

    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
  end
end

# reference to an installed dependency, as returned by Formula["name"]
class DependencyFormula
  def initialize(name) = @name = name

  def opt_prefix = MISE_BREW_PREFIX + "opt" + @name
  def opt_bin = opt_prefix + "bin"
  def opt_lib = opt_prefix + "lib"
  def opt_include = opt_prefix + "include"
  def opt_libexec = opt_prefix + "libexec"
  def opt_share = opt_prefix + "share"
  def opt_frameworks = opt_prefix + "Frameworks"

  # resolved keg path (through the opt symlink)

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