cacheless env: detecting "no change" in fedora-coreos-overlay rpm

[dustymabe]

Testing out the FCOS pipeline, which is moving to using no cache at all between builds (at least for dev for now), I notice the fedora-coreos-overlay rpm is detected as changed between two builds where no content in that rpm should have changed:

    "pkgdiff": [
        [
            "htop",
            0,
            {
                "NewPackage": [
                    "htop",
                    "2.2.0-4.fc30",
                    "x86_64"
                ]
            }
        ],
        [
            "fedora-coreos-overlay",
            2,
            {
                "PreviousPackage": [
                    "fedora-coreos-overlay",
                    "1559760183-098f5d8",
                    "noarch"
                ],
                "NewPackage": [
                    "fedora-coreos-overlay",
                    "1559763067-098f5d8",
                    "noarch"
                ]
            }
        ]
    ],

Is it possible to properly detect no change from these in a cacheless scenario?

[dustymabe]

original discussion: coreos/fedora-coreos-pipeline#62 (comment)

[jlebon]

This would be fixed by #555.

[jlebon]

Fixed by #555.