Helm 3: Registry blob storage to follow OCI Image Layout Spec

[jdolitsky]

Currently the charts are stored in custom fashion in ${HELM_HOME}/registry:

$ tree ~/.helm/registry
/Users/me/.helm/registry
├── blobs
│   └── sha256
│       ├── 3344059bb81c49cc6f2599a379da0a6c14313cf969f7b821aca18e489ba3991b
│       └── 84059d7403f496a1c63caf97fdc5e939ea39e561adbd98d0aa864d1b9fc9653f
├── charts
│   └── mychart
│       └── versions
│           └── 2.7.1
└── refs
    └── localhost_5000
        └── myrepo
            └── mychart
                └── tags
                    └── latest
                        ├── chart -> /Users/me/.helm/registry/charts/mychart/versions/2.7.1
                        ├── content -> /Users/me/.helm/registry/blobs/sha256/3344059bb81c49cc6f2599a379da0a6c14313cf969f7b821aca18e489ba3991b
                        └── meta -> /Users/me/.helm/registry/blobs/sha256/84059d7403f496a1c63caf97fdc5e939ea39e561adbd98d0aa864d1b9fc9653f

Instead, Helm should adhere to the OCI Image Layout Specification:

$ find . -type f
./index.json
./oci-layout
./blobs/sha256/3588d02542238316759cbf24502f4344ffcc8a60c803870022f335d1390c13b4
./blobs/sha256/4b0bc1c4050b03c95ef2a8e36e25feac42fd31283e8c30b3ee5df6b043155d3c
./blobs/sha256/7968321274dc6b6171697c33df7815310468e694ac5be0ec03ff053bb135e768

cc @jzelinskie @bacongobbler

[bacongobbler]

Hye @jdolitsky where are we with this?

[jzelinskie]

IIRC @stevvooe mentioned that there is a library in containerd that abstracts this away. I have no idea if it'll work alongside your XDG_HOME/CONFIG PR, though.

[bacongobbler]

upstream ticket: oras-project/oras#107

[bacongobbler]

Thanks for the heads up @jzelinskie! I'll do some digging in containerd and see what comes up.

[jdolitsky]

Hi, hoping to have this land upstream in ORAS early next week.

…

On Wed, Jul 31, 2019 at 1:44 PM Matthew Fisher ***@***.***> wrote: Thanks for the heads up @jzelinskie <https://github.com/jzelinskie>! I'll do some digging in containerd and see what comes up. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#6068?email_source=notifications&email_token=AADACFXPFNJEX5WFZ3WMIR3QCHMRZA5CNFSM4IGHQJG2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3IGAIQ#issuecomment-516972578>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AADACFXYUFIVT5HMWR7ZMQ3QCHMRZANCNFSM4IGHQJGQ> .

[bacongobbler]

removing from the beta milestone as #6185 has been PR'd, which means this discussion can move forward without blocking the release.

[jdolitsky]

closed via #6205