Add IRSA authentication support - #189
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Allow authentication via EKS projected service account tokens instead of requiring static AccessKeyID/SecretAccessKey. When useIRSA is set in the CSI secret, the driver uses IAM credential providers that automatically refresh from the projected token file. All three mounters (geesefs, rclone, s3fs) pass IRSA env vars so they can independently refresh credentials for long-running mounts.
Tests cover secret parsing (static creds, IRSA, explicit role/token path, insecure flag, default behavior), geesefs authEnvs() for both static and IRSA modes, and mounter construction for all three mounter types with IRSA config.
Add useIRSA, roleArn, and webIdentityTokenFile to the Helm values, secret template, and the plain Kubernetes example secret.
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Summary
accessKeyID/secretAccessKeycredentialscredentials.NewIAMfor automatic token refreshAWS_ROLE_ARN/AWS_WEB_IDENTITY_TOKEN_FILEenv vars so long-running mounts can refresh credentials independentlyAddresses #48 and #98
Usage
Test plan
go test ./pkg/s3/ ./pkg/mounter/)