Prog A calls Prog B via invoke_signed. How do I pass account_infos for the next CPI call from Prog B to Prog C?

Question

I have Program A. It makes a CPI call to Program B via invoke_signed.

User makes a call to the Program A. These accounts will be passed to the Program B:

• token_program: AccountInfo<'a>
• source: AccountInfo<'a>
• destination: AccountInfo<'a>
• authority: AccountInfo<'a>

Then, I want Program B to make another CPI call to Program C. On behalf and using seeds of the Program A

So, the problem is - how do I pass the Program C account_info? The first thought was - can I hardcode it? like:

let program_c = Pubkey::from_str("PubKEyHere111111...") 

But... I'm not allowed to 'hardcode' it in Program B. There is no way to convert PubKey to account_info. Because that's how the Solana Runtime works - you should pass all the Account_Metas beforehand. But, is it still a way to do that except passing it explicitly to the Program A?

Answer 1

The accounts needed for Program C needs to be passed in via the CPI call made to Program B. Which circles back to the accounts needed for both Program B and Program C needs to be passed in when the user makes a call to Program A

There is no other way to do this.