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// Copyright 2018 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package v1
import (
"fmt"
"sort"
"strings"
)
// Platform represents the target os/arch for an image.
type Platform struct {
Architecture string `json:"architecture"`
OS string `json:"os"`
OSVersion string `json:"os.version,omitempty"`
OSFeatures []string `json:"os.features,omitempty"`
Variant string `json:"variant,omitempty"`
Features []string `json:"features,omitempty"`
}
func (p Platform) String() string {
if p.OS == "" {
return ""
}
var b strings.Builder
b.WriteString(p.OS)
if p.Architecture != "" {
b.WriteString("/")
b.WriteString(p.Architecture)
}
if p.Variant != "" {
b.WriteString("/")
b.WriteString(p.Variant)
}
if p.OSVersion != "" {
b.WriteString(":")
b.WriteString(p.OSVersion)
}
return b.String()
}
// ParsePlatform parses a string representing a Platform, if possible.
func ParsePlatform(s string) (*Platform, error) {
var p Platform
parts := strings.Split(strings.TrimSpace(s), ":")
if len(parts) == 2 {
p.OSVersion = parts[1]
}
parts = strings.Split(parts[0], "/")
if len(parts) > 0 {
p.OS = parts[0]
}
if len(parts) > 1 {
p.Architecture = parts[1]
}
if len(parts) > 2 {
p.Variant = parts[2]
}
if len(parts) > 3 {
return nil, fmt.Errorf("too many slashes in platform spec: %s", s)
}
return &p, nil
}
// Equals returns true if the given platform is semantically equivalent to this one.
// The order of Features and OSFeatures is not important.
func (p Platform) Equals(o Platform) bool {
return p.OS == o.OS &&
p.Architecture == o.Architecture &&
p.Variant == o.Variant &&
p.OSVersion == o.OSVersion &&
stringSliceEqualIgnoreOrder(p.OSFeatures, o.OSFeatures) &&
stringSliceEqualIgnoreOrder(p.Features, o.Features)
}
// Satisfies returns true if this Platform "satisfies" the given spec Platform.
//
// Note that this is different from Equals and that Satisfies is not reflexive.
//
// The given spec represents "requirements" such that any missing values in the
// spec are not compared.
//
// For OSFeatures and Features, Satisfies will return true if this Platform's
// fields contain a superset of the values in the spec's fields (order ignored).
func (p Platform) Satisfies(spec Platform) bool {
return satisfies(spec.OS, p.OS) &&
satisfies(spec.Architecture, p.Architecture) &&
satisfies(spec.Variant, p.Variant) &&
satisfies(spec.OSVersion, p.OSVersion) &&
satisfiesList(spec.OSFeatures, p.OSFeatures) &&
satisfiesList(spec.Features, p.Features)
}
func satisfies(want, have string) bool {
return want == "" || want == have
}
func satisfiesList(want, have []string) bool {
if len(want) == 0 {
return true
}
set := map[string]struct{}{}
for _, h := range have {
set[h] = struct{}{}
}
for _, w := range want {
if _, ok := set[w]; !ok {
return false
}
}
return true
}
// stringSliceEqual compares 2 string slices and returns if their contents are identical.
func stringSliceEqual(a, b []string) bool {
if len(a) != len(b) {
return false
}
for i, elm := range a {
if elm != b[i] {
return false
}
}
return true
}
// stringSliceEqualIgnoreOrder compares 2 string slices and returns if their contents are identical, ignoring order
func stringSliceEqualIgnoreOrder(a, b []string) bool {
if a != nil && b != nil {
sort.Strings(a)
sort.Strings(b)
}
return stringSliceEqual(a, b)
}
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