A way to diff that only recurses if outputs are different

[ocharles]

I have two derivations that are different, /nix/store/f6a70iijzdq7xzkyycqcggqdv2s77nla-HsOpenSSL-0.11.4.11.drv and /nix/store/7kmc4asp07ffp9ppihmvl0xjk6qcq2gq-HsOpenSSL-0.11.4.11.drv. However, this doesn't actually matter, because the outputs of both of these derivations are the same thing. The differences in derivation are due to how tars are fetched (different mirrors), but the result is the same due to the fixed output.

Thus while these are different derivations, they don't affect substitution. It'd be nice if nix-diff didn't consider such derivations further (just check that the outputs are the same).

[Gabriella439]

Yeah, I just ran into this issue, too. I agree that this should be fixed although I won't be able to get to it for a few weeks if that's alright

[expipiplus1]

Having this be an optional feature would be helpful. It could be useful to be informed of differences even with fixed outputs.

…

On Thu, 11 Jan 2018, 03:44 Gabriel Gonzalez, ***@***.***> wrote: Yeah, I just ran into this issue, too. I agree that this should be fixed although I won't be able to get to it for a few weeks if that's alright — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#4 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA0U3HXOJml8HQtPhae4ygdm98WB5X9cks5tJXWfgaJpZM4RaGPs> .

[Gabriella439]

I have a quick and dirty branch up here:

https://github.com/Gabriel439/nix-diff/tree/gabriel/fixed_outputs

I'll test it more once I have another example of this at work to test drive this on