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fix: pull-through fallback token scope for registries returning placeholder scope (e.g. ghcr.io) - #149
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fix: pull-through fallback token scope for registries returning placeholder scope (e.g. ghcr.io)#149ariesy wants to merge 2 commits into
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August 8, 2026 14:27
…e (e.g. ghcr.io)
Two issues prevented pull-through fallback from working with ghcr.io:
1. The scope returned by the upstream /v2/ endpoint (e.g. ghcr.io returns
"repository:user/image:pull") was used as-is and then double-prefixed
with "repository:", producing garbage scopes like
"repository:repository:user/image:pull:pull,push" which the token
endpoint rejects. Always use the actual request namespace instead.
2. Requested scope included push permission (":pull,push") even though
fallback only performs read operations. ghcr.io rejects combined
pull,push scopes with 403 DENIED; requesting only ":pull" works.
Verified: ghcr.io (actions/actions-runner, home-assistant, otel-collector)
now returns 200 through fallback; docker.io, registry.k8s.io, quay.io and
gcr.io regression tests all pass.
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Fixes #148
Summary
Pull-through fallback to ghcr.io (and any registry whose
/v2/endpoint returns ascopeattribute inWWW-Authenticate) currently fails withmanifest unknown(404). Two issues insrc/registry/http.ts:Double-prefixed scope:
authenticate()only overrides the upstream scope when empty, but ghcr.io returns a placeholder scope (repository:user/image:pull), soauthenticateBearer()buildsrepository:repository:user/image:pull:pull,pushwhich the token endpoint rejects.Unnecessary push permission:
authenticateBearer()requests:pull,push, but ghcr.io's token endpoint returns403 DENIEDfor combined scopes and only accepts single:pull. Fallback is read-only, so push permission is not needed.Changes
src/registry/http.ts:/v2/:pullpermission instead of:pull,pushVerification
Tested against a deployed instance with
REGISTRIES_JSON= Docker Hub + ghcr.io + registry.k8s.io + quay.io + gcr.io: