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target.go
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target.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package target
import (
"context"
"fmt"
"path/filepath"
"kraftkit.sh/initrd"
"kraftkit.sh/kconfig"
"kraftkit.sh/unikraft"
"kraftkit.sh/unikraft/arch"
"kraftkit.sh/unikraft/component"
"kraftkit.sh/unikraft/plat"
)
type Target interface {
component.Component
// Architecture is the component architecture for this target.
Architecture() arch.Architecture
// Platform is the component platform for this target.
Platform() plat.Platform
// Kernel is the path to the kernel for this target.
Kernel() string
// KernelDbg is the path to the symbolic (unstripped) kernel for this target.
KernelDbg() string
// Initrd contains the initramfs configuration for this target.
Initrd() initrd.Initrd
// Command is the command-line arguments set for this target.
Command() []string
// ConfigFilename returns the target-specific `.config` file which contains
// all the porclained KConfig key values which is formatted
// `.config.<TARGET-NAME>`
ConfigFilename() string
}
type TargetConfig struct {
// name of the target.
name string
// architecture is the target architecture.
architecture arch.ArchitectureConfig
// platform is the target platform.
platform plat.PlatformConfig
// kconfig list of kconfig key-values specific to this library.
kconfig kconfig.KeyValueMap
// kernel is the path to the kernel for this target.
kernel string
// kernelDbg is the path to the symbolic (unstripped) kernel for this target.
kernelDbg string
// initrd is the configuration for the initrd.
initrd initrd.Initrd
// command is the command-line arguments set for this target.
command []string
}
// NewTargetFromOptions is a constructor for TargetConfig.
func NewTargetFromOptions(opts ...TargetOption) (Target, error) {
tc := TargetConfig{}
for _, opt := range opts {
if err := opt(&tc); err != nil {
return nil, err
}
}
return &tc, nil
}
func (tc *TargetConfig) String() string {
return fmt.Sprintf("%s (%s/%s)", tc.name, tc.platform.String(), tc.architecture.String())
}
func (tc *TargetConfig) Name() string {
return tc.name
}
func (tc *TargetConfig) Source() string {
return ""
}
func (tc *TargetConfig) Version() string {
return ""
}
func (tc *TargetConfig) Architecture() arch.Architecture {
return tc.architecture
}
func (tc *TargetConfig) Platform() plat.Platform {
return tc.platform
}
func (tc *TargetConfig) Kernel() string {
return tc.kernel
}
func (tc *TargetConfig) KernelDbg() string {
return tc.kernelDbg
}
func (tc *TargetConfig) Initrd() initrd.Initrd {
return tc.initrd
}
func (tc *TargetConfig) Type() unikraft.ComponentType {
return unikraft.ComponentTypeUnknown
}
func (tc *TargetConfig) Path() string {
return ""
}
func (tc *TargetConfig) Command() []string {
return tc.command
}
func (tc *TargetConfig) IsUnpacked() bool {
return false
}
func (tc *TargetConfig) KConfig() kconfig.KeyValueMap {
if tc.kconfig == nil {
tc.kconfig = kconfig.KeyValueMap{}
}
tc.kconfig.OverrideBy(tc.architecture.KConfig())
tc.kconfig.OverrideBy(tc.platform.KConfig())
return tc.kconfig
}
func (tc *TargetConfig) ConfigFilename() string {
var name string
if tc.kernel == "" {
name = fmt.Sprintf("%s_%s-%s", tc.Name(), tc.platform.Name(), tc.architecture.Name())
} else {
name = filepath.Base(tc.kernel)
}
return fmt.Sprintf("%s.%s", kconfig.DotConfigFileName, name)
}
func (tc *TargetConfig) KConfigTree(_ context.Context, env ...*kconfig.KeyValue) (*kconfig.KConfigFile, error) {
return nil, fmt.Errorf("target does not have a Config.uk file")
}
func (tc *TargetConfig) PrintInfo(ctx context.Context) string {
return "not implemented: unikraft.plat.TargetConfig.PrintInfo"
}
// TargetName returns the name of the kernel image based on standard pattern
// which is baked within Unikraft's build system, see for example `KVM_IMAGE`.
// If we do not have a target name, return an error.
func KernelName(target TargetConfig) (string, error) {
if target.Name() == "" {
return "", fmt.Errorf("target name not set, cannot determine binary name")
}
return fmt.Sprintf(
"%s_%s-%s",
target.Name(),
target.platform.Name(),
target.architecture.Name(),
), nil
}
// KernelDbgName is identical to KernelName but is used to access the symbolic
// kernel image which has not been stripped.
func KernelDbgName(target TargetConfig) (string, error) {
name, err := KernelName(target)
if err != nil {
return "", err
}
return fmt.Sprintf("%s.dbg", name), nil
}
// TargetPlatArchName returns the canonical name for the platform and
// architecture combination.
func TargetPlatArchName(target Target) string {
return fmt.Sprintf(
"%s/%s",
target.Platform().Name(),
target.Architecture().Name(),
)
}
// MarshalYAML makes TargetConfig implement yaml.Marshaller
func (tc TargetConfig) MarshalYAML() (interface{}, error) {
return map[string]interface{}{
"architecture": tc.architecture.Name(),
"platform": tc.platform.Name(),
}, nil
}