extract.DirectoryAndExecutableNaming is not able to handle symlinks yet

[ericsun2]

For example, 8.0.17 and 8.0.18 are shipped with symlinks in /bin directory.

$ tar -Jtvf mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz | grep '/libcrypto\|/libssl'
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/bin/libcrypto.so.1.0.0 -> ../lib/libcrypto.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/bin/libssl.so.1.0.0 -> ../lib/libssl.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/lib/libcrypto.so -> libcrypto.so.1.0.0
-rw-r--r-- pb2user/common    2605390 2019-06-26 14:49 mysql-8.0.17-linux-glibc2.12-x86_64/lib/libcrypto.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/lib/libssl.so -> libssl.so.1.0.0
-rw-r--r-- pb2user/common     512744 2019-06-26 14:49 mysql-8.0.17-linux-glibc2.12-x86_64/lib/libssl.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/lib/plugin/debug/libcrypto.so.1.0.0 -> ../../../lib/libcrypto.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/lib/plugin/debug/libssl.so.1.0.0 -> ../../../lib/libssl.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/lib/plugin/libcrypto.so.1.0.0 -> ../../lib/libcrypto.so.1.0.0
lrwxrwxrwx pb2user/common          0 2019-06-26 15:35 mysql-8.0.17-linux-glibc2.12-x86_64/lib/plugin/libssl.so.1.0.0 -> ../../lib/libssl.so.1.0.0

$ tar -Jtvf mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz | grep '/libcrypto\|/libssl'
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/bin/libcrypto.so.1.1 -> ../lib/libcrypto.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/bin/libssl.so.1.1 -> ../lib/libssl.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/lib/libcrypto.so -> libcrypto.so.1.1
-rw-r--r-- pb2user/common    8109016 2019-09-20 05:08 mysql-8.0.18-linux-glibc2.12-x86_64/lib/libcrypto.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/lib/libssl.so -> libssl.so.1.1
-rw-r--r-- pb2user/common    2156763 2019-09-20 05:08 mysql-8.0.18-linux-glibc2.12-x86_64/lib/libssl.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/lib/plugin/debug/libcrypto.so.1.1 -> ../../../lib/libcrypto.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/lib/plugin/debug/libssl.so.1.1 -> ../../../lib/libssl.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/lib/plugin/libcrypto.so.1.1 -> ../../lib/libcrypto.so.1.1
lrwxrwxrwx pb2user/common          0 2019-09-20 05:57 mysql-8.0.18-linux-glibc2.12-x86_64/lib/plugin/libssl.so.1.1 -> ../../lib/libssl.so.1.1

Try to experiment a little bit in Nix8FileSetEmitter.java

         return FileSet.builder()
                 .addEntry(Executable, "bin/mysqld")
                 .addEntry(Library, "bin/mysql")
                 .addEntry(Library, "bin/mysqladmin")
                 .addEntry(Library, "bin/my_print_defaults")
                 .addEntry(Library, "share/english/errmsg.sys")
-                .addEntry(FileType.Library, "lib/libssl.so.1.0.0")
-                .addEntry(FileType.Library, "lib/libcrypto.so.1.0.0")
+                .addEntry(FileType.Library, String.format("%s/libssl.so.%s", libPath, libVersion))
+                .addEntry(FileType.Library, String.format("%s/libcrypto.so.%s", libPath, libVersion))
+                .addEntry(Library, "bin/libcrypto.so." + libVersion)
+                .addEntry(Library, "bin/libssl.so." + libVersion)
                 .build();

Unfortunately, still get 0-byte file instead of symlink:

$ ls -l ~/.embedmysql/extracted/Linux-B64--/MySQL-8.0/mysql-8.0.11-linux-glibc2.12/bin/
total 700580
-rw-r--r-- 1 esun2 foo         0 May  4 23:47 libcrypto.so.1.0.0
-rw-r--r-- 1 esun2 foo         0 May  4 23:47 libssl.so.1.0.0
-rw-r--r-- 1 esun2 foo   9148728 May  4 23:46 my_print_defaults
-rw-r--r-- 1 esun2 foo  12360416 May  4 23:46 mysql
-rw-r--r-- 1 esun2 foo  11022552 May  4 23:46 mysqladmin
-rwxr--r-- 1 esun2 foo 684848952 May  4 23:47 mysqld

Am I expecting too much from the "extract" action? How is symlink supported in #185?

[jakemonO]

see my PR... #190

6955b5a#diff-1a5932403256c34d207245e115659e1d

[ericsun2]

Thanks @jakemonO !
I left 2 comments in your PR, please see how we can better support 8.0.19 and above.