[ruby-core:90712] [Ruby trunk Bug#15461] ruby-2.6.0.tar.gz seems incorrectly packed

Issue #15461 has been updated by mame (Yusuke Endoh).


I tried `docker run --rm -ti ubuntu:18.04` and it works.  Why...

```
root@07f1505cc1d7:/# uname -a
Linux 07f1505cc1d7 4.18.0-13-generic #14-Ubuntu SMP Wed Dec 5 09:04:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
root@07f1505cc1d7:/# cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"
root@07f1505cc1d7:/# tar --version
tar (GNU tar) 1.29
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by John Gilmore and Jay Fenlason.
root@07f1505cc1d7:/# wget https://ftp.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0.tar.gz
--2018-12-25 13:02:15--  https://ftp.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0.tar.gz
Resolving ftp.ruby-lang.org (ftp.ruby-lang.org)... 151.101.129.178, 151.101.193.178, 151.101.1.178, ...
Connecting to ftp.ruby-lang.org (ftp.ruby-lang.org)|151.101.129.178|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 16687800 (16M) [application/x-tar]
Saving to: 'ruby-2.6.0.tar.gz'

ruby-2.6.0.tar.gz         100%[=====================================>]  15.91M  3.09MB/s    in 7.4s    

2018-12-25 13:02:23 (2.15 MB/s) - 'ruby-2.6.0.tar.gz' saved [16687800/16687800]

root@07f1505cc1d7:/# rm -rf ruby-2.6.0 ruby-2.6.0.tar
root@07f1505cc1d7:/# gunzip ruby-2.6.0.tar.gz 
root@07f1505cc1d7:/# tar -xf ruby-2.6.0.tar ruby-2.6.0
```

----------------------------------------
Bug #15461: ruby-2.6.0.tar.gz seems incorrectly packed
https://bugs.ruby-lang.org/issues/15461#change-75887

* Author: valich (Valentin Fondaratov)
* Status: Third Party's Issue
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.0
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
1. Download `ftp.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0.tar.gz`

2. Run from the console:

`ruby -e 'require "zlib";require "minitar";Minitar.unpack(Zlib::GzipReader.new(File.open("ruby-2.6.0.tar.gz", "rb")), "x")'`

It fails with an exception:
```
Traceback (most recent call last):
	17: from -e:1:in `<main>'
	16: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar.rb:249:in `unpack'
	15: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/input.rb:27:in `open'
	14: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar.rb:256:in `block in unpack'
	13: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/input.rb:90:in `each_entry'
	12: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/reader.rb:207:in `each_entry'
	11: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/reader.rb:207:in `loop'
	10: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/reader.rb:226:in `block in each_entry'
	 9: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/input.rb:91:in `block in each_entry'
	 8: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar.rb:258:in `block (2 levels) in unpack'
	 7: from /home/user/.rvm/gems/ruby-2.5.0/gems/minitar-0.7/lib/archive/tar/minitar/input.rb:162:in `extract_entry'
	 6: from /home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:193:in `mkdir_p'
	 5: from /home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:193:in `each'
	 4: from /home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:208:in `block in mkdir_p'
	 3: from /home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:208:in `reverse_each'
	 2: from /home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:210:in `block (2 levels) in mkdir_p'
	 1: from /home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:229:in `fu_mkdir'
/home/user/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/fileutils.rb:229:in `mkdir': File exists @ dir_s_mkdir - x/ruby-2.6.0/libexec (Errno::EEXIST)
```

It seems flags are set incorrectly in the package. Same command for previous rubies tgzs works well.



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