Add symlink support, closes #8

[fetep]

This creates tar archives with working symlinks, although I am having trouble making the test for this work. I end up with this as a failure, any pointers/help appreciated:

  1) Failure:
TestTarWriter#test_symlink [/nycasa.nydc.fxcorp.prv/nfs1/home/pfritchman/src/minitar/test/test_tar_writer.rb:178]:
Field name of the tar header differs..
--- expected
+++ actual
@@ -1 +1 @@
-"lib/foo\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+"lib/foo/bar\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"

---

This change is 

[coveralls]

Coverage increased (+0.5%) to 79.96% when pulling 09e991d on fetep:symlink_support into bfc5bfa on halostatue:master.

[coveralls]

Coverage increased (+0.5%) to 79.96% when pulling 09e991d on fetep:symlink_support into bfc5bfa on halostatue:master.

[halostatue]

I’ll have to look at this a bit more in depth—and I haven’t had a chance to do this so far, but the immediately problem that I’m seeing is that one of these is Unicode (\u0000) and the other is ASCII (\x00\x00).

[jordansissel]

@halostatue I've had problems like that before where Ruby's ideas of default string encoding is ... in disagreement with my assumptions.

Things maybe to check:

• If you don't have an # encoding: utf-8 line at the top of your ruby files, I recommend this. I believe it's optional in Ruby 1.9.3, but assumed to be utf-8 in Ruby 2.0.0+.
• If you are reading files, open them with binary mode (File.new("path", "rb"))
• If you have explicit global settings, you can set Encoding.default_external = Encoding::UTF_8 and same for Encoding.default_internal.
• If you know a string is a binary blob, you can force the encoding label in Ruby with String#force_encoding: `"foo".force_encoding("BINARY") to tell ruby that it's really a binary blob, not utf-8.

Hope this helps! I've had many encoding battles with Ruby in the past :P

[lollipopman]

@halostatue would love to see symlinks supported, any chance of this being worked on?

[halostatue]

@lollipopman I have no time to do so. The PR is essentially complete, except for the unit test failure, so you could start from there.

[halostatue]

@fetep @lollipopman I think that I have this fixed properly in #42 against the current codebase. If you could test this, we can release it as part of 0.10 or shortly after as 0.11.

[lollipopman]

@halostatue awesome, I'll give it a try, thanks!

[halostatue]

@lollipopman Did you get a chance to test #12?

[lollipopman]

@halostatue, I tested it today, seems to work perfect, thanks again!