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Add the option to choose an image by the variant field in a manifest #854
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| package platform | ||
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| // Largely based on | ||
| // https://github.com/moby/moby/blob/bc846d2e8fe5538220e0c31e9d0e8446f6fbc022/distribution/cpuinfo_unix.go | ||
| // Copyright 2012-2017 Docker, Inc. | ||
| // | ||
| // https://github.com/containerd/containerd/blob/726dcaea50883e51b2ec6db13caff0e7936b711d/platforms/cpuinfo.go | ||
| // Copyright The containerd Authors. | ||
| // 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. | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "os" | ||
| "runtime" | ||
| "strings" | ||
|
|
||
| "github.com/containers/image/v5/types" | ||
| imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1" | ||
| ) | ||
|
|
||
| // For Linux, the kernel has already detected the ABI, ISA and Features. | ||
| // So we don't need to access the ARM registers to detect platform information | ||
| // by ourselves. We can just parse these information from /proc/cpuinfo | ||
| func getCPUInfo(pattern string) (info string, err error) { | ||
| if runtime.GOOS != "linux" { | ||
| return "", fmt.Errorf("getCPUInfo for OS %s not implemented", runtime.GOOS) | ||
| } | ||
|
|
||
| cpuinfo, err := os.Open("/proc/cpuinfo") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer cpuinfo.Close() | ||
|
|
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| // Start to Parse the Cpuinfo line by line. For SMP SoC, we parse | ||
| // the first core is enough. | ||
| scanner := bufio.NewScanner(cpuinfo) | ||
| for scanner.Scan() { | ||
| newline := scanner.Text() | ||
| list := strings.Split(newline, ":") | ||
|
|
||
| if len(list) > 1 && strings.EqualFold(strings.TrimSpace(list[0]), pattern) { | ||
| return strings.TrimSpace(list[1]), nil | ||
| } | ||
| } | ||
|
|
||
| // Check whether the scanner encountered errors | ||
| err = scanner.Err() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| return "", fmt.Errorf("getCPUInfo for pattern: %s not found", pattern) | ||
| } | ||
|
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||
| func getCPUVariantWindows() string { | ||
| // Windows only supports v7 for ARM32 and v8 for ARM64 and so we can use | ||
| // runtime.GOARCH to determine the variants | ||
| var variant string | ||
| switch runtime.GOARCH { | ||
| case "arm64": | ||
| variant = "v8" | ||
| case "arm": | ||
| variant = "v7" | ||
| default: | ||
| variant = "" | ||
| } | ||
|
|
||
| return variant | ||
| } | ||
|
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| func getCPUVariantArm() string { | ||
| variant, err := getCPUInfo("Cpu architecture") | ||
| if err != nil { | ||
| return "" | ||
| } | ||
| // TODO handle RPi Zero mismatch (https://github.com/moby/moby/pull/36121#issuecomment-398328286) | ||
|
|
||
| switch strings.ToLower(variant) { | ||
| case "8", "aarch64": | ||
| variant = "v8" | ||
| case "7", "7m", "?(12)", "?(13)", "?(14)", "?(15)", "?(16)", "?(17)": | ||
| variant = "v7" | ||
| case "6", "6tej": | ||
| variant = "v6" | ||
| case "5", "5t", "5te", "5tej": | ||
| variant = "v5" | ||
| case "4", "4t": | ||
| variant = "v4" | ||
| case "3": | ||
| variant = "v3" | ||
| default: | ||
| variant = "" | ||
| } | ||
|
|
||
| return variant | ||
| } | ||
|
|
||
| func getCPUVariant(os string, arch string) string { | ||
| if os == "windows" { | ||
| return getCPUVariantWindows() | ||
| } | ||
| if arch == "arm" || arch == "arm64" { | ||
| return getCPUVariantArm() | ||
| } | ||
| return "" | ||
| } | ||
|
|
||
| var compatibility = map[string][]string{ | ||
| "arm": {"v7", "v6", "v5"}, | ||
| "arm64": {"v8"}, | ||
| } | ||
|
|
||
| // Returns all compatible platforms with the platform specifics possibly overriden by user, | ||
| // the most compatible platform is first. | ||
| // If some option (arch, os, variant) is not present, a value from current platform is detected. | ||
| func WantedPlatforms(ctx *types.SystemContext) ([]imgspecv1.Platform, error) { | ||
| wantedArch := runtime.GOARCH | ||
| if ctx != nil && ctx.ArchitectureChoice != "" { | ||
| wantedArch = ctx.ArchitectureChoice | ||
| } | ||
| wantedOS := runtime.GOOS | ||
| if ctx != nil && ctx.OSChoice != "" { | ||
| wantedOS = ctx.OSChoice | ||
| } | ||
|
|
||
| wantedVariant := getCPUVariant(runtime.GOOS, runtime.GOARCH) | ||
| if ctx != nil && ctx.VariantChoice != "" { | ||
| wantedVariant = ctx.VariantChoice | ||
| } | ||
|
|
||
| var wantedPlatforms []imgspecv1.Platform | ||
| if wantedVariant != "" && compatibility[wantedArch] != nil { | ||
| wantedPlatforms = make([]imgspecv1.Platform, 0, len(compatibility[wantedArch])) | ||
| wantedIndex := -1 | ||
| for i, v := range compatibility[wantedArch] { | ||
| if wantedVariant == v { | ||
| wantedIndex = i | ||
| break | ||
| } | ||
| } | ||
| // user wants a variant which we know nothing about - not even compatibility | ||
| if wantedIndex == -1 { | ||
| wantedPlatforms = []imgspecv1.Platform{ | ||
| { | ||
| OS: wantedOS, | ||
| Architecture: wantedArch, | ||
| Variant: wantedVariant, | ||
| }, | ||
| } | ||
| } else { | ||
| for i := wantedIndex; i < len(compatibility[wantedArch]); i++ { | ||
| v := compatibility[wantedArch][i] | ||
| wantedPlatforms = append(wantedPlatforms, imgspecv1.Platform{ | ||
| OS: wantedOS, | ||
| Architecture: wantedArch, | ||
| Variant: v, | ||
| }) | ||
| } | ||
| } | ||
| } else { | ||
| wantedPlatforms = []imgspecv1.Platform{ | ||
| { | ||
| OS: wantedOS, | ||
| Architecture: wantedArch, | ||
| Variant: wantedVariant, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| return wantedPlatforms, nil | ||
| } | ||
|
|
||
| func MatchesPlatform(image imgspecv1.Platform, wanted imgspecv1.Platform) bool { | ||
| if image.Architecture != wanted.Architecture { | ||
| return false | ||
| } | ||
| if image.OS != wanted.OS { | ||
| return false | ||
| } | ||
|
|
||
| if wanted.Variant == "" || image.Variant == wanted.Variant { | ||
| return true | ||
| } | ||
|
|
||
| return false | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| package platform | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/containers/image/v5/types" | ||
| imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestWantedPlatformsCompatibility(t *testing.T) { | ||
| ctx := &types.SystemContext{ | ||
| ArchitectureChoice: "arm", | ||
| OSChoice: "linux", | ||
| VariantChoice: "v6", | ||
| } | ||
| platforms, err := WantedPlatforms(ctx) | ||
| assert.Nil(t, err) | ||
| assert.Equal(t, len(platforms), 2) | ||
| assert.Equal(t, platforms[0], imgspecv1.Platform{ | ||
| OS: ctx.OSChoice, | ||
| Architecture: ctx.ArchitectureChoice, | ||
| Variant: "v6", | ||
| }) | ||
| assert.Equal(t, platforms[1], imgspecv1.Platform{ | ||
| OS: ctx.OSChoice, | ||
| Architecture: ctx.ArchitectureChoice, | ||
| Variant: "v5", | ||
| }) | ||
| } | ||
|
|
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| func TestWantedPlatformsCustom(t *testing.T) { | ||
| ctx := &types.SystemContext{ | ||
| ArchitectureChoice: "armel", | ||
| OSChoice: "freeBSD", | ||
| VariantChoice: "custom", | ||
| } | ||
| platforms, err := WantedPlatforms(ctx) | ||
| assert.Nil(t, err) | ||
| assert.Equal(t, len(platforms), 1) | ||
| assert.Equal(t, platforms[0], imgspecv1.Platform{ | ||
| OS: ctx.OSChoice, | ||
| Architecture: ctx.ArchitectureChoice, | ||
| Variant: ctx.VariantChoice, | ||
| }) | ||
| } |
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