136 lines
3.3 KiB
Go
136 lines
3.3 KiB
Go
package model
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import (
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"fmt"
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"sort"
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"strings"
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)
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// Platform represents the target os/arch for an image.
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type Platform struct {
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Architecture string `json:"architecture"`
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OS string `json:"os"`
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OSVersion string `json:"os.version,omitempty"`
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OSFeatures []string `json:"os.features,omitempty"`
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Variant string `json:"variant,omitempty"`
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Features []string `json:"features,omitempty"`
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}
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func (p Platform) String() string {
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if p.OS == "" {
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return ""
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}
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var b strings.Builder
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b.WriteString(p.OS)
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if p.Architecture != "" {
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b.WriteString("/")
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b.WriteString(p.Architecture)
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}
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if p.Variant != "" {
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b.WriteString("/")
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b.WriteString(p.Variant)
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}
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if p.OSVersion != "" {
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b.WriteString(":")
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b.WriteString(p.OSVersion)
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}
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return b.String()
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}
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// ParsePlatform parses a string representing a Platform, if possible.
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func ParsePlatform(s string) (*Platform, error) {
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var p Platform
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parts := strings.Split(strings.TrimSpace(s), ":")
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if len(parts) == 2 {
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p.OSVersion = parts[1]
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}
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parts = strings.Split(parts[0], "/")
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if len(parts) > 0 {
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p.OS = parts[0]
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}
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if len(parts) > 1 {
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p.Architecture = parts[1]
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}
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if len(parts) > 2 {
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p.Variant = parts[2]
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}
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if len(parts) > 3 {
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return nil, fmt.Errorf("too many slashes in platform spec: %s", s)
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}
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return &p, nil
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}
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// Equals returns true if the given platform is semantically equivalent to this one.
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// The order of Features and OSFeatures is not important.
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func (p Platform) Equals(o Platform) bool {
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return p.OS == o.OS &&
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p.Architecture == o.Architecture &&
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p.Variant == o.Variant &&
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p.OSVersion == o.OSVersion &&
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stringSliceEqualIgnoreOrder(p.OSFeatures, o.OSFeatures) &&
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stringSliceEqualIgnoreOrder(p.Features, o.Features)
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}
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// Satisfies returns true if this Platform "satisfies" the given spec Platform.
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//
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// Note that this is different from Equals and that Satisfies is not reflexive.
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//
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// The given spec represents "requirements" such that any missing values in the
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// spec are not compared.
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//
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// For OSFeatures and Features, Satisfies will return true if this Platform's
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// fields contain a superset of the values in the spec's fields (order ignored).
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func (p Platform) Satisfies(spec Platform) bool {
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return satisfies(spec.OS, p.OS) &&
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satisfies(spec.Architecture, p.Architecture) &&
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satisfies(spec.Variant, p.Variant) &&
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satisfies(spec.OSVersion, p.OSVersion) &&
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satisfiesList(spec.OSFeatures, p.OSFeatures) &&
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satisfiesList(spec.Features, p.Features)
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}
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func satisfies(want, have string) bool {
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return want == "" || want == have
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}
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func satisfiesList(want, have []string) bool {
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if len(want) == 0 {
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return true
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}
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set := map[string]struct{}{}
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for _, h := range have {
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set[h] = struct{}{}
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}
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for _, w := range want {
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if _, ok := set[w]; !ok {
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return false
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}
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}
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return true
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}
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// stringSliceEqual compares 2 string slices and returns if their contents are identical.
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func stringSliceEqual(a, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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for i, elm := range a {
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if elm != b[i] {
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return false
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}
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}
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return true
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}
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// stringSliceEqualIgnoreOrder compares 2 string slices and returns if their contents are identical, ignoring order
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func stringSliceEqualIgnoreOrder(a, b []string) bool {
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if a != nil && b != nil {
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sort.Strings(a)
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sort.Strings(b)
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}
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return stringSliceEqual(a, b)
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}
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