My question for HN is how do I convince my boss to open source things like wrappers around libs? I do not only have to convince my boss (a software developer) but the CEO (all business) as well.
Open sourcing software assists in its stability by creating a larger user base (users who report bugs) and attracting contributors (free development).
At the same time, open source contributions can promote a favorable view of the company as giving back to the community from which they presumably take. This can be attractive to prospective employees. I've been fortunate enough to be able to work on open source projects and indeed contribute them back to the open source community, and I likely would not be interested in any position where that were not the case to some extent.
Of course, there is always a need for a lot of software to remain proprietary. But at the same time, there are plenty of cases where the benefits of the open source community (testing and contributions) outweigh the risks of helping your competitors (open source generally useful tools, not specific competitive advantages in your industry).
Businesses are amoral, if you can make a business case for why it improves their reputation/profitability/return then they'll likely agree.
For example, you might try suggesting that outside developers could contribute bug fixes and or improvements which the business could benefit from for free.
However if the library could assist your company's competition then forget it, it won't happen.
Is there anything that you would lose by open sourcing?
If the answer is "nothing" then argue that there's only upside -- which is probably true.