JRuby

Tailing a file with file-tail blows up with EOF when the file gets truncated

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Description

Reported on IRC:

/opt/local/jruby-1.1b1/lib/ruby/gems/1.8/gems/file-tail-1.0.2/lib/file/tail.rb:300:in `loop': End of file reached (EOFError)
	from /opt/local/jruby-1.1b1/lib/ruby/gems/1.8/gems/file-tail-1.0.2/lib/file/tail.rb:300:in `tail'
	from /opt/local/jruby-1.1b1/lib/ruby/gems/1.8/gems/file-tail-1.0.2/lib/file/tail.rb:300:in `tail'
	from script/logmonster:26:in `open'
	from /opt/local/jruby-1.1b1/lib/ruby/gems/1.8/gems/file-tail-1.0.2/lib/file/tail.rb:101:in `open'

To reproduce: tail a file with lines in it (tail advances file pointer to max), truncate file

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Ola Bini added a comment -

Can you either give us a script that reproduces this behavior, or try again with current trunk? Charles has reworked the IO subsystem lately, and it might well already be fixed.

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Ola Bini added a comment - Can you either give us a script that reproduces this behavior, or try again with current trunk? Charles has reworked the IO subsystem lately, and it might well already be fixed.
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Charles Oliver Nutter added a comment -

Punting issues from 1.1 RC2 to 1.1 final.

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Charles Oliver Nutter added a comment - Punting issues from 1.1 RC2 to 1.1 final.
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Charles Oliver Nutter added a comment -

A test case for the bug, which does appear to still be failing:

require 'test/unit'
require 'fileutils'

class Test1897 < Test::Unit::TestCase
  def setup
    FileUtils.rm_f("test.file")rescue nil
  end
  def teardown
    FileUtils.rm_f("test.file")rescue nil
  end
  def test_1897
    File.open("test.file", 'w') do |f|
      0.upto(100){|n|f.write(n)}
    end
    a = Thread.new do
      File.open("test.file") do |f|
        f.seek(IO::SEEK_END)
        0.upto(50) do
          f.readline
          puts "sleepin'"
          sleep 1
          puts "awoke"
        end
      end
    end

    b =Thread.new do
      0.upto(500) do
        if a.status != 'run'
          puts "deleting file while a is sleepin'"
          FileUtils.rm_f("test.file")
          break
          sleep 1
        end
      end
    end
    b.join
    a.join
  end
end
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Charles Oliver Nutter added a comment - A test case for the bug, which does appear to still be failing: require 'test/unit' require 'fileutils' class Test1897 < Test::Unit::TestCase def setup FileUtils.rm_f( "test.file" )rescue nil end def teardown FileUtils.rm_f( "test.file" )rescue nil end def test_1897 File.open( "test.file" , 'w') do |f| 0.upto(100){|n|f.write(n)} end a = Thread . new do File.open( "test.file" ) do |f| f.seek(IO::SEEK_END) 0.upto(50) do f.readline puts "sleepin'" sleep 1 puts "awoke" end end end b = Thread . new do 0.upto(500) do if a.status != 'run' puts "deleting file while a is sleepin'" FileUtils.rm_f( "test.file" ) break sleep 1 end end end b.join a.join end end
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Thomas E Enebo added a comment -

The unit test provided fails under current version of MRI and JRuby. Resolving.

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Thomas E Enebo added a comment - The unit test provided fails under current version of MRI and JRuby. Resolving.
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Charles Oliver Nutter added a comment -

Migrating bugs marked as resolved before 1.1RC3 and tagged as version 1.1 as fixed in RC3. Only two bugs are actually fixed between RC3 and 1.1

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Charles Oliver Nutter added a comment - Migrating bugs marked as resolved before 1.1RC3 and tagged as version 1.1 as fixed in RC3. Only two bugs are actually fixed between RC3 and 1.1

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  • Assignee:
    Unassigned
    Reporter:
    Charles Oliver Nutter
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  • Created:
    Updated:
    Resolved: