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fix: docker auth for docker.io images #3482

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fix: docker auth for docker.io images #3482

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8528d77
add auth test for the default registry
LaurentGoderre Nov 3, 2025
00cbc7d
fix: docker auth for docker.io images
LaurentGoderre Nov 3, 2025
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6 changes: 6 additions & 0 deletions docker_auth.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import (
"fmt"
"net/url"
"os"
"strings"
"sync"

"github.com/cpuguy83/dockercfg"
Expand Down Expand Up @@ -42,6 +43,11 @@ func dockerImageAuth(ctx context.Context, image string, configs map[string]regis
defaultRegistry := defaultRegistryFn(ctx)
reg := core.ExtractRegistry(image, defaultRegistry)

// Make comparison case-insensitive and handle both aliases
if strings.EqualFold(reg, "docker.io") || strings.EqualFold(reg, "registry.hub.docker.com") {
reg = defaultRegistry
}

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@stevenh stevenh Nov 10, 2025

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question: should this be handled by core.ExtractRegistry?

if cfg, ok := getRegistryAuth(reg, configs); ok {
return reg, cfg, nil
}
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14 changes: 14 additions & 0 deletions docker_auth_test.go
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Expand Up @@ -123,6 +123,20 @@ func TestDockerImageAuth(t *testing.T) {
require.Equal(t, base64, cfg.Auth)
})

t.Run("match the default registry authentication by host", func(t *testing.T) {
imageReg := "docker.io"
imagePath := "/my/image:latest"
reg := defaultRegistry(context.Background())
base64 := setAuthConfig(t, reg, "gopher", "secret")

registry, cfg, err := DockerImageAuth(context.Background(), imageReg+imagePath)
require.NoError(t, err)
require.Equal(t, reg, registry)
require.Equal(t, "gopher", cfg.Username)
require.Equal(t, "secret", cfg.Password)
require.Equal(t, base64, cfg.Auth)
})

t.Run("fail to match registry authentication due to invalid host", func(t *testing.T) {
imageReg := "example-auth.com"
imagePath := "/my/image:latest"
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