`security delete-generic-password` sometimes succeeds but does not delete about nix-installer

[abathur]

Duplicating comment here from the other thread; I didn't notice you'd opened this when I posted there:

I suspect that the reason the commands are succeeding is that there's more than one credential matching the invocation from previous install attempts. (I guess it might not be deleting the credential, but I'd rule out duplicates before tilting at that possibility? Since the official installer doesn't remove creds and the user notes that they used it at some point, they may have had multiple credentials from that timeframe instead of from running the detsys installer.)

It's possible this output is out of date since it's from an older macOS, but I do get an error status if there's no matching credential:

$ security delete-generic-password -a "one" -s "two" -l "three" -D "four"; echo $?
security: SecKeychainSearchCopyNext: The specified item could not be found in the keychain.
44

Keeping passwords matched up with volumes is part of why the official shell installer is using the volume UUID in the credential and mounting service definition.

[Hoverbear]

Noting we now include wording in our error messages related to this, so it's mitigated.