Snippet of Solana Anchor CLI IDL manipulation when IDL account is managed under multisig

anchor-idl-multisig.sh

# https://gist.github.com/ochaloup/e013a7912858818ad2855e13754edf36

# get IDL account address
solana find-program-derived-address <PROGRAM_ID_PUBKEY>
solana create-address-with-seed --from <DERIVED_ADDRESS> 'anchor:idl' <PROGRAM_ID_PUBKEY>

# initialize anchor IDL account with wallet as authority
anchor idl init --provider.cluster mainnet \
  --provider.wallet path/to/wallet.json \
  --filepath ./target/idl/<some-anchor-program>.json \
  <PROGRAM_ID_PUBKEY>

# change IDL authority to multisig public key
anchor idl set-authority --provider.cluster mainnet \
  --provider.wallet path/to/wallet.json \
  --program-id <PROGRAM_ID_PUBKEY> \
  --new-authority <MULTISIG_PUBKEY>

# IDL upgrade is needed?
anchor idl write-buffer --provider.cluster mainnet \
  --filepath target/idl/<some-anchor-program>.json \
  <PROGRAM_ID_PUBKEY>
# -> Idl buffer created: <BUFFER_ID>

# change authority of the IDL buffer to multisig pubkey
anchor idl set-authority --provider.cluster mainnet \
  --new-authority <MULTISIG_PUBKEY>  \
  --program-id <PROGRAM_ID_PUBKEY> \
  <BUFFER_ID>

# generate base64 format transaction
# the authority pubkey that has to sign is found from program data from chain
anchor idl --provider.cluster mainnet \
  set-buffer --buffer <BUFFER_ID> \
  <PROGRAM_ID_PUBKEY> \
  --print-only
 
# base64 instruction can be plugged as an instruction in the multisig program