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127 lines
4.1 KiB
Ruby
127 lines
4.1 KiB
Ruby
# typed: strict
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# frozen_string_literal: true
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require "fcntl"
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require "utils/socket"
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module Utils
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sig { params(child_error: T::Hash[String, T.untyped]).returns(Exception) }
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def self.rewrite_child_error(child_error)
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inner_class = Object.const_get(child_error["json_class"])
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error = if child_error["cmd"] && inner_class == ErrorDuringExecution
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ErrorDuringExecution.new(child_error["cmd"],
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status: child_error["status"],
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output: child_error["output"])
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elsif child_error["cmd"] && inner_class == BuildError
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# We fill `BuildError#formula` and `BuildError#options` in later,
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# when we rescue this in `FormulaInstaller#build`.
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BuildError.new(nil, child_error["cmd"], child_error["args"], child_error["env"])
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elsif inner_class == Interrupt
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Interrupt.new
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else
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# Everything other error in the child just becomes a RuntimeError.
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RuntimeError.new <<~EOS
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An exception occurred within a child process:
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#{inner_class}: #{child_error["m"]}
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EOS
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end
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error.set_backtrace child_error["b"]
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error
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end
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# When using this function, remember to call `exec` as soon as reasonably possible.
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# This function does not protect against the pitfalls of what you can do pre-exec in a fork.
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# See `man fork` for more information.
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sig {
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params(directory: T.nilable(String), yield_parent: T::Boolean,
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_blk: T.proc.params(arg0: T.nilable(String)).void).void
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}
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def self.safe_fork(directory: nil, yield_parent: false, &_blk)
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require "json/add/exception"
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block = proc do |tmpdir|
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UNIXServerExt.open("#{tmpdir}/socket") do |server|
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read, write = IO.pipe
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pid = fork do
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# bootsnap doesn't like these forked processes
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ENV["HOMEBREW_NO_BOOTSNAP"] = "1"
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error_pipe = server.path
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ENV["HOMEBREW_ERROR_PIPE"] = error_pipe
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server.close
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read.close
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write.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
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Process::UID.change_privilege(Process.euid) if Process.euid != Process.uid
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yield(error_pipe)
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# This could be any type of exception, so rescue them all.
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rescue Exception => e # rubocop:disable Lint/RescueException
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error_hash = JSON.parse e.to_json
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# Special case: We need to recreate ErrorDuringExecutions
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# for proper error messages and because other code expects
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# to rescue them further down.
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if e.is_a?(ErrorDuringExecution)
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error_hash["cmd"] = e.cmd
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error_hash["status"] = if e.status.is_a?(Process::Status)
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{
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exitstatus: e.status.exitstatus,
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termsig: e.status.termsig,
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}
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else
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e.status
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end
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error_hash["output"] = e.output
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end
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write.puts error_hash.to_json
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write.close
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exit!
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else
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exit!(true)
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end
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begin
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yield(nil) if yield_parent
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begin
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socket = server.accept_nonblock
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rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::ECONNABORTED, Errno::EPROTO, Errno::EINTR
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retry unless Process.waitpid(pid, Process::WNOHANG)
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else
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socket.send_io(write)
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socket.close
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end
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write.close
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data = read.read
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read.close
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Process.waitpid(pid) unless socket.nil?
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rescue Interrupt
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Process.waitpid(pid)
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end
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# 130 is the exit status for a process interrupted via Ctrl-C.
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raise Interrupt if $CHILD_STATUS.exitstatus == 130
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raise Interrupt if $CHILD_STATUS.termsig == Signal.list["INT"]
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if data.present?
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error_hash = JSON.parse(T.must(data.lines.first))
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raise rewrite_child_error(error_hash)
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end
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raise ChildProcessError, $CHILD_STATUS unless $CHILD_STATUS.success?
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end
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end
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if directory
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block.call(directory)
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else
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Dir.mktmpdir("homebrew-fork", HOMEBREW_TEMP, &block)
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end
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end
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end
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