Fallback to podman auth.json when .docker/config.json is not found - #293
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On machines that run podman, `.docker/config.json` may not exist. The [podman login manpage](https://docs.podman.io/en/latest/markdown/podman-login.1.html) explicitly states it uses either `XDG_RUNTIME_DIR/containers/auth.json` or `~/.config/containers/auth.json`, so this change makes it so we try to use these files when the docker specific one is not found.
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📝 WalkthroughWalkthroughWhen environment credentials are absent, ChangesAuthentication file lookup
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Podman authentication can fail despite valid credentials when they use namespace keys or reside in a persistent file behind an unrelated runtime file. Resolve these lookup gaps before merging unless these limitations are explicitly accepted. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
Review comments at @internal/dockerauth/dockerauth.go:
- Around line 90-100: Update the fallback logic in the Docker config lookup to
distinguish missing files from other `os.Stat` errors: use `errors.Is` with
`fs.ErrNotExist` and return other errors directly. When Docker config is absent,
check both the `XDG_RUNTIME_DIR` and home `.config` Podman auth paths, and wrap
the final error with context if neither exists.
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internal/dockerauth/dockerauth.go
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Inline comments:
Review comments at @internal/dockerauth/dockerauth_test.go:
- Line 52: Update the authentication-file tests using setupMockAuthEnvironment
to clear REGISTRY_USERNAME and REGISTRY_PASSWORD before createMockAuthFile,
ensuring GetAndVerifyCredentials reaches file lookup regardless of inherited
environment credentials.
Review comments at @internal/dockerauth/dockerauth.go:
- Line 120: Update the auth-file candidate construction to omit the runtime path
when XDG_RUNTIME_DIR is empty, preserving the Docker, runtime, then home Podman
search order. Locate the candidate list in the Docker authentication lookup and
append the runtime candidate only when the environment variable is nonempty.
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Inline comments:
Review comments at @internal/dockerauth/dockerauth.go:
- Line 99: Update findAuthConfigPath and the credential lookup flow so a
candidate without credentials or a credential helper for the requested host does
not stop searching d.authFiles; continue to later Podman candidates while
propagating file-read, parsing, and credential-helper errors. Add a test where
unrelated runtime credentials are followed by matching persistent credentials.
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Actionable comments posted: 1
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Review comments at @internal/dockerauth/dockerauth.go:
- Line 104: Update the credential lookup at getCredentialsFromDockerConfig to
receive the requested repository path and match Podman namespace keys from most
specific to host-level; keep host for registry verification and
credential-helper lookup, and add a fixture covering credentials stored under a
namespace key.
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iamkirkbater
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This looks good as is and I'm approving it - I'm not going to ask for further iterations, but have you ever used afero before for replacing filesystem operations? IMO it greatly simplifies the way we'd test this (and doesn't require actually creating temporary directories within the tests either). https://github.com/spf13/afero
Just something to consider in the future. Then instead of creating temp files within the system you're running the tests on you just mock the filesystem return calls.
First time I'm hearing about it, but I'm also don't use go as my first language, I just wanted to fix my credentials problem in a way that might help other people. I'll keep it in mind for the future, I'm sure some other folks doing full time go dev work will appreciate it so thanks for bringing it up! |
3 participants
On machines that run podman,
.docker/config.jsonmay not exist. The podman login manpage explicitly states it uses eitherXDG_RUNTIME_DIR/containers/auth.jsonor~/.config/containers/auth.json, so this change makes it so we try to use these files when the docker specific one is not found.The change was validated on my Fedora system, which run podman and does not have the
~/.docker/config.jsonfile, using roxie to deploy to a KinD cluster successfully.roxie deployment log
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