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package libimage
import (
"context"
"fmt"
"runtime"
)
// PlatformPolicy controls the behavior of image-platform matching.
type PlatformPolicy int
const (
// Only debug log if an image does not match the expected platform.
PlatformPolicyDefault PlatformPolicy = iota
// Warn if an image does not match the expected platform.
PlatformPolicyWarn
)
func toPlatformString(architecture, os, variant string) string {
if variant == "" {
return fmt.Sprintf("%s/%s", os, architecture)
}
return fmt.Sprintf("%s/%s/%s", os, architecture, variant)
}
// Checks whether the image matches the specified platform.
// Returns
// * 1) a matching error that can be used for logging (or returning) what does not match
// * 2) a bool indicating whether architecture, os or variant were set (some callers need that to decide whether they need to throw an error)
// * 3) a fatal error that occurred prior to check for matches (e.g., storage errors etc.)
func (i *Image) matchesPlatform(ctx context.Context, architecture, os, variant string) (error, bool, error) {
customPlatform := len(architecture)+len(os)+len(variant) != 0
if len(architecture) == 0 {
architecture = runtime.GOARCH
}
if len(os) == 0 {
os = runtime.GOOS
}
inspectInfo, err := i.inspectInfo(ctx)
if err != nil {
return nil, customPlatform, fmt.Errorf("inspecting image: %w", err)
}
matches := true
switch {
case architecture != inspectInfo.Architecture:
matches = false
case os != inspectInfo.Os:
matches = false
case variant != "" && variant != inspectInfo.Variant:
matches = false
}
if matches {
return nil, customPlatform, nil
}
imagePlatform := toPlatformString(inspectInfo.Architecture, inspectInfo.Os, inspectInfo.Variant)
expectedPlatform := toPlatformString(architecture, os, variant)
return fmt.Errorf("image platform (%s) does not match the expected platform (%s)", imagePlatform, expectedPlatform), customPlatform, nil
}
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