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Description of problem:
If signatures cannot be stored, the current error message does not make the problem clear.

Version-Release number of selected component (if applicable):
Currently released versions of skopeo

How reproducible:
Attempt to copy from a registry with a configured sigstore to one that does not have a configured sigstore

Steps to Reproduce:
1. Configure a sigstore for a source registry
2. Do not configure a sigstore for destination registry
3. Copy from the source to the destination without specifying the "--remove-signatures" flag

Actual results:
Error received: "FATA[0003] Can not copy signatures: X-Registry-Supports-Signatures extension not supported, and lookaside is not configured"

Expected results:
Skopeo prevents this by design but the error could be more user-friendly.

Parker, since you were recently in the Skopeo project, please take a look at this.

I've recently taken over as TAM on this account and would to provide some kind of update on this bug to the customer, is there anything we can share at this time?

Parker any progress?

I apologize for the delay. I've been able to recreate the bug and will look into a fix over the next day or two.

PR https://github.com/containers/image/pull/997 up with proposed fix.

Fixed with https://github.com/containers/image/pull/963, so the response will now be "Can not copy signatures to <ImageRef>"

Assigning to Jindrich for packaging needs.

The PR in comment 7 is already applied in skopeo-1.2.0.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: container-tools:rhel8 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:0531