Ruby SQLite3 OCRA executable missing sqlite_native.so

Question

I am trying to package the following ruby script with OCRA (I am on Windows 10, Ruby 2.6):

require 'sqlite3'

puts SQLite3::VERSION

Running this in cmd works properly:

C:\Users\monday\Documents\projects\sqlite3_test>script.rb
1.4.2

When I package script.rb the following way:

ocra --gem-full=sqlite3 --dll sqlite3.dll script.rb --output script.exe --verbose

I have added sqlite3.dll and sqlite3.def to my PATH and into C:\Ruby26-x64\bin as per various suggestions on SO and GitHub.

Here is the error that pops up when I run the resulting script.exe:

C:\Users\monday\Documents\projects\sqlite3_test>script.exe
Traceback (most recent call last):
        2: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/src/script.rb:1:in `<main>'
        1: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- sqlite3 (LoadError)
        6: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/src/script.rb:1:in `<main>'
        5: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:34:in `require'
        4: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `rescue in require'
        3: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `require'
        2: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3.rb:4:in `<top (required)>'
        1: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- sqlite3/2.6/sqlite3_native (LoadError)
        7: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/src/script.rb:1:in `<main>'
        6: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:34:in `require'
        5: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `rescue in require'
        4: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `require'
        3: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3.rb:2:in `<top (required)>'
        2: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3.rb:6:in `rescue in <top (required)>'
        1: from C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': 126: The specified module could not be found.   - C:/Users/monday/AppData/Local/Temp/ocr7747.tmp/lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/sqlite3_native.so (LoadError)

I am sure that lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/sqlite3_native.so is present in the temporary folder, judging by OCRA's output:

...
m lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3.rb
m lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/constants.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/database.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/errors.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/pragmas.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/resultset.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/sqlite3_native.so <<< HERE!
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/statement.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/translator.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/value.rb
a lib/ruby/gems/2.6.0/gems/sqlite3-1.4.2/lib/sqlite3/version.rb
...

What am I missing?

Answer 1

After some research I found out that the error message The specified module could not be found. means that the program might be missing required DLLs. Now that sqlite3_native.so is present, I presumed that it is that program that is missing DLLs. Running dumpbin on it gave the following results:

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community>dumpbin /dependents C:\Ruby26-x64\lib\ruby\gems\2.6.0\gems\sqlite3-1.4.2\lib\sqlite3\sqlite3_native.so
Microsoft (R) COFF/PE Dumper Version 14.22.27905.0
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file C:\Ruby26-x64\lib\ruby\gems\2.6.0\gems\sqlite3-1.4.2\lib\sqlite3\sqlite3_native.so

File Type: DLL

  Image has the following dependencies:

    x64-msvcrt-ruby260.dll
    KERNEL32.dll
    msvcrt.dll
    libsqlite3-0.dll

...

Apparently, libsqlite3-0.dll was never detected by OCRA, and thus never moved into temporary folder's bin/ directory. A quick search revealed that libsqlite3-0.dll is indeed present on my machine at C:\Ruby26-x64\msys64\mingw64\bin. I moved it to C:\Ruby26-x64\bin, and ran OCRA with the following options:

ocra --dll libsqlite3-0.dll script.rb --output script.exe

Later, I realized that OCRA is now able to detect this DLL on its own:

=== Adding ruby executable ruby.exe
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/libgmp-10.dll
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/libffi-6.dll
=== Adding detected DLL C:/Ruby26-x64/bin/libsqlite3-0.dll <<<< HERE!
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/libgcc_s_seh-1.dll
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/libwinpthread-1.dll
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/zlib1.dll
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/libssl-1_1-x64.dll
=== Adding detected DLL C:/Ruby26-x64/bin/ruby_builtin_dlls/libcrypto-1_1-x64.dll
=== Adding external manifest C:/Ruby26-x64/bin/ruby_builtin_dlls/ruby_builtin_dlls.manifest

So, finally:

ocra script.rb --output script.exe

Works properly, and there is no need for sqlite3.dll.

This seems to be quite a universal solution, as I was able to make puma run from within OCRA-packaged script by adding required DLLs to Ruby installation's bin/ folder.