Comment 0 for bug 1979128

[Impact]

In Ruby 3.0, sdbm has been removed from the standard library[1]. However, some packages, such as the bsfilter package, will fail at startup without the sdbm library, LP: #1972040 .

The ruby-sdbm package does not exist in Jammy, only in Kinetic. Therefore, backporting ruby-sdbm from kinetic to jammy and relying on ruby-sdbm on the bsfilter side seems to solve the problem.

[1] https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/

[Test Plan]

How to reproduce the bug.

$ sudo apt install bsfilter
$ bsfilter
<internal:/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- sdbm (LoadError)
Did you mean? dbm
        from <internal:/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb>:85:in `require'
        from /usr/bin/bsfilter:3106:in `get_options'
        from /usr/bin/bsfilter:3262:in `setup'
        from /usr/bin/bsfilter:3413:in `<main>'

[Where problems could occur]

The ruby-sdbm package does not exist in Jammy, I do not believe that any regression will occur.