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Merge pull request #9662 from dmcgowan/replace-platform-package

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Use github.com/containerd/platforms package
This commit is contained in:
Derek McGowan
2024-01-23 19:50:25 +00:00
committed by GitHub
parent 8e1578eed9 e79ec7a095
commit f2765617c5
102 changed files with 335 additions and 1464 deletions
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*.go text eol=lf

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linters:
enable:
- exportloopref # Checks for pointers to enclosing loop variables
- gofmt
- goimports
- gosec
- ineffassign
- misspell
- nolintlint
- revive
- staticcheck
- tenv # Detects using os.Setenv instead of t.Setenv since Go 1.17
- unconvert
- unused
- vet
- dupword # Checks for duplicate words in the source code
disable:
- errcheck
run:
timeout: 5m
skip-dirs:
- api
- cluster
- design
- docs
- docs/man
- releases
- reports
- test # e2e scripts

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Apache License
Version 2.0, January 2004
https://www.apache.org/licenses/
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of the NOTICE file are for informational purposes only and
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that such additional attribution notices cannot be construed
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You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
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origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
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of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
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
https://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.

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# platforms
A Go package for formatting, normalizing and matching container platforms.
This package is based on the Open Containers Image Spec definition of a [platform](https://github.com/opencontainers/image-spec/blob/main/specs-go/v1/descriptor.go#L52).
## Platform Specifier
While the OCI platform specifications provide a tool for components to
specify structured information, user input typically doesn't need the full
context and much can be inferred. To solve this problem, this package introduces
"specifiers". A specifier has the format
`<os>|<arch>|<os>/<arch>[/<variant>]`. The user can provide either the
operating system or the architecture or both.
An example of a common specifier is `linux/amd64`. If the host has a default
runtime that matches this, the user can simply provide the component that
matters. For example, if an image provides `amd64` and `arm64` support, the
operating system, `linux` can be inferred, so they only have to provide
`arm64` or `amd64`. Similar behavior is implemented for operating systems,
where the architecture may be known but a runtime may support images from
different operating systems.
## Project details
**platforms** is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
As a containerd sub-project, you will find the:
* [Project governance](https://github.com/containerd/project/blob/main/GOVERNANCE.md),
* [Maintainers](https://github.com/containerd/project/blob/main/MAINTAINERS),
* and [Contributing guidelines](https://github.com/containerd/project/blob/main/CONTRIBUTING.md)
information in our [`containerd/project`](https://github.com/containerd/project) repository.

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/*
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.
*/
package platforms
import (
"strconv"
"strings"
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
// MatchComparer is able to match and compare platforms to
// filter and sort platforms.
type MatchComparer interface {
Matcher
Less(specs.Platform, specs.Platform) bool
}
// platformVector returns an (ordered) vector of appropriate specs.Platform
// objects to try matching for the given platform object (see platforms.Only).
func platformVector(platform specs.Platform) []specs.Platform {
vector := []specs.Platform{platform}
switch platform.Architecture {
case "amd64":
if amd64Version, err := strconv.Atoi(strings.TrimPrefix(platform.Variant, "v")); err == nil && amd64Version > 1 {
for amd64Version--; amd64Version >= 1; amd64Version-- {
vector = append(vector, specs.Platform{
Architecture: platform.Architecture,
OS: platform.OS,
OSVersion: platform.OSVersion,
OSFeatures: platform.OSFeatures,
Variant: "v" + strconv.Itoa(amd64Version),
})
}
}
vector = append(vector, specs.Platform{
Architecture: "386",
OS: platform.OS,
OSVersion: platform.OSVersion,
OSFeatures: platform.OSFeatures,
})
case "arm":
if armVersion, err := strconv.Atoi(strings.TrimPrefix(platform.Variant, "v")); err == nil && armVersion > 5 {
for armVersion--; armVersion >= 5; armVersion-- {
vector = append(vector, specs.Platform{
Architecture: platform.Architecture,
OS: platform.OS,
OSVersion: platform.OSVersion,
OSFeatures: platform.OSFeatures,
Variant: "v" + strconv.Itoa(armVersion),
})
}
}
case "arm64":
variant := platform.Variant
if variant == "" {
variant = "v8"
}
vector = append(vector, platformVector(specs.Platform{
Architecture: "arm",
OS: platform.OS,
OSVersion: platform.OSVersion,
OSFeatures: platform.OSFeatures,
Variant: variant,
})...)
}
return vector
}
// Only returns a match comparer for a single platform
// using default resolution logic for the platform.
//
// For arm/v8, will also match arm/v7, arm/v6 and arm/v5
// For arm/v7, will also match arm/v6 and arm/v5
// For arm/v6, will also match arm/v5
// For amd64, will also match 386
func Only(platform specs.Platform) MatchComparer {
return Ordered(platformVector(Normalize(platform))...)
}
// OnlyStrict returns a match comparer for a single platform.
//
// Unlike Only, OnlyStrict does not match sub platforms.
// So, "arm/vN" will not match "arm/vM" where M < N,
// and "amd64" will not also match "386".
//
// OnlyStrict matches non-canonical forms.
// So, "arm64" matches "arm/64/v8".
func OnlyStrict(platform specs.Platform) MatchComparer {
return Ordered(Normalize(platform))
}
// Ordered returns a platform MatchComparer which matches any of the platforms
// but orders them in order they are provided.
func Ordered(platforms ...specs.Platform) MatchComparer {
matchers := make([]Matcher, len(platforms))
for i := range platforms {
matchers[i] = NewMatcher(platforms[i])
}
return orderedPlatformComparer{
matchers: matchers,
}
}
// Any returns a platform MatchComparer which matches any of the platforms
// with no preference for ordering.
func Any(platforms ...specs.Platform) MatchComparer {
matchers := make([]Matcher, len(platforms))
for i := range platforms {
matchers[i] = NewMatcher(platforms[i])
}
return anyPlatformComparer{
matchers: matchers,
}
}
// All is a platform MatchComparer which matches all platforms
// with preference for ordering.
var All MatchComparer = allPlatformComparer{}
type orderedPlatformComparer struct {
matchers []Matcher
}
func (c orderedPlatformComparer) Match(platform specs.Platform) bool {
for _, m := range c.matchers {
if m.Match(platform) {
return true
}
}
return false
}
func (c orderedPlatformComparer) Less(p1 specs.Platform, p2 specs.Platform) bool {
for _, m := range c.matchers {
p1m := m.Match(p1)
p2m := m.Match(p2)
if p1m && !p2m {
return true
}
if p1m || p2m {
return false
}
}
return false
}
type anyPlatformComparer struct {
matchers []Matcher
}
func (c anyPlatformComparer) Match(platform specs.Platform) bool {
for _, m := range c.matchers {
if m.Match(platform) {
return true
}
}
return false
}
func (c anyPlatformComparer) Less(p1, p2 specs.Platform) bool {
var p1m, p2m bool
for _, m := range c.matchers {
if !p1m && m.Match(p1) {
p1m = true
}
if !p2m && m.Match(p2) {
p2m = true
}
if p1m && p2m {
return false
}
}
// If one matches, and the other does, sort match first
return p1m && !p2m
}
type allPlatformComparer struct{}
func (allPlatformComparer) Match(specs.Platform) bool {
return true
}
func (allPlatformComparer) Less(specs.Platform, specs.Platform) bool {
return false
}

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/*
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.
*/
package platforms
import (
"runtime"
"sync"
"github.com/containerd/log"
)
// Present the ARM instruction set architecture, eg: v7, v8
// Don't use this value directly; call cpuVariant() instead.
var cpuVariantValue string
var cpuVariantOnce sync.Once
func cpuVariant() string {
cpuVariantOnce.Do(func() {
if isArmArch(runtime.GOARCH) {
var err error
cpuVariantValue, err = getCPUVariant()
if err != nil {
log.L.Errorf("Error getCPUVariant for OS %s: %v", runtime.GOOS, err)
}
}
})
return cpuVariantValue
}

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/*
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.
*/
package platforms
import (
"bufio"
"bytes"
"errors"
"fmt"
"os"
"runtime"
"strings"
"golang.org/x/sys/unix"
)
// getMachineArch retrieves the machine architecture through system call
func getMachineArch() (string, error) {
var uname unix.Utsname
err := unix.Uname(&uname)
if err != nil {
return "", err
}
arch := string(uname.Machine[:bytes.IndexByte(uname.Machine[:], 0)])
return arch, nil
}
// 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) {
cpuinfo, err := os.Open("/proc/cpuinfo")
if err != nil {
return "", err
}
defer cpuinfo.Close()
// 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: %w", pattern, errNotFound)
}
// getCPUVariantFromArch get CPU variant from arch through a system call
func getCPUVariantFromArch(arch string) (string, error) {
var variant string
arch = strings.ToLower(arch)
if arch == "aarch64" {
variant = "8"
} else if arch[0:4] == "armv" && len(arch) >= 5 {
// Valid arch format is in form of armvXx
switch arch[3:5] {
case "v8":
variant = "8"
case "v7":
variant = "7"
case "v6":
variant = "6"
case "v5":
variant = "5"
case "v4":
variant = "4"
case "v3":
variant = "3"
default:
variant = "unknown"
}
} else {
return "", fmt.Errorf("getCPUVariantFromArch invalid arch: %s, %w", arch, errInvalidArgument)
}
return variant, nil
}
// getCPUVariant returns cpu variant for ARM
// We first try reading "Cpu architecture" field from /proc/cpuinfo
// If we can't find it, then fall back using a system call
// This is to cover running ARM in emulated environment on x86 host as this field in /proc/cpuinfo
// was not present.
func getCPUVariant() (string, error) {
variant, err := getCPUInfo("Cpu architecture")
if err != nil {
if errors.Is(err, errNotFound) {
// Let's try getting CPU variant from machine architecture
arch, err := getMachineArch()
if err != nil {
return "", fmt.Errorf("failure getting machine architecture: %v", err)
}
variant, err = getCPUVariantFromArch(arch)
if err != nil {
return "", fmt.Errorf("failure getting CPU variant from machine architecture: %v", err)
}
} else {
return "", fmt.Errorf("failure getting CPU variant: %v", err)
}
}
// handle edge case for Raspberry Pi ARMv6 devices (which due to a kernel quirk, report "CPU architecture: 7")
// https://www.raspberrypi.org/forums/viewtopic.php?t=12614
if runtime.GOARCH == "arm" && variant == "7" {
model, err := getCPUInfo("model name")
if err == nil && strings.HasPrefix(strings.ToLower(model), "armv6-compatible") {
variant = "6"
}
}
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 = "unknown"
}
return variant, nil
}

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//go:build !linux
/*
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.
*/
package platforms
import (
"fmt"
"runtime"
)
func getCPUVariant() (string, error) {
var variant string
if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
// Windows/Darwin only supports v7 for ARM32 and v8 for ARM64 and so we can use
// runtime.GOARCH to determine the variants
switch runtime.GOARCH {
case "arm64":
variant = "v8"
case "arm":
variant = "v7"
default:
variant = "unknown"
}
} else if runtime.GOOS == "freebsd" {
// FreeBSD supports ARMv6 and ARMv7 as well as ARMv4 and ARMv5 (though deprecated)
// detecting those variants is currently unimplemented
switch runtime.GOARCH {
case "arm64":
variant = "v8"
default:
variant = "unknown"
}
} else {
return "", fmt.Errorf("getCPUVariant for OS %s: %v", runtime.GOOS, errNotImplemented)
}
return variant, nil
}

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/*
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.
*/
package platforms
import (
"runtime"
"strings"
)
// These function are generated from https://golang.org/src/go/build/syslist.go.
//
// We use switch statements because they are slightly faster than map lookups
// and use a little less memory.
// isKnownOS returns true if we know about the operating system.
//
// The OS value should be normalized before calling this function.
func isKnownOS(os string) bool {
switch os {
case "aix", "android", "darwin", "dragonfly", "freebsd", "hurd", "illumos", "ios", "js", "linux", "nacl", "netbsd", "openbsd", "plan9", "solaris", "windows", "zos":
return true
}
return false
}
// isArmArch returns true if the architecture is ARM.
//
// The arch value should be normalized before being passed to this function.
func isArmArch(arch string) bool {
switch arch {
case "arm", "arm64":
return true
}
return false
}
// isKnownArch returns true if we know about the architecture.
//
// The arch value should be normalized before being passed to this function.
func isKnownArch(arch string) bool {
switch arch {
case "386", "amd64", "amd64p32", "arm", "armbe", "arm64", "arm64be", "ppc64", "ppc64le", "loong64", "mips", "mipsle", "mips64", "mips64le", "mips64p32", "mips64p32le", "ppc", "riscv", "riscv64", "s390", "s390x", "sparc", "sparc64", "wasm":
return true
}
return false
}
func normalizeOS(os string) string {
if os == "" {
return runtime.GOOS
}
os = strings.ToLower(os)
switch os {
case "macos":
os = "darwin"
}
return os
}
// normalizeArch normalizes the architecture.
func normalizeArch(arch, variant string) (string, string) {
arch, variant = strings.ToLower(arch), strings.ToLower(variant)
switch arch {
case "i386":
arch = "386"
variant = ""
case "x86_64", "x86-64", "amd64":
arch = "amd64"
if variant == "v1" {
variant = ""
}
case "aarch64", "arm64":
arch = "arm64"
switch variant {
case "8", "v8":
variant = ""
}
case "armhf":
arch = "arm"
variant = "v7"
case "armel":
arch = "arm"
variant = "v6"
case "arm":
switch variant {
case "", "7":
variant = "v7"
case "5", "6", "8":
variant = "v" + variant
}
}
return arch, variant
}

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/*
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.
*/
package platforms
// DefaultString returns the default string specifier for the platform.
func DefaultString() string {
return Format(DefaultSpec())
}
// DefaultStrict returns strict form of Default.
func DefaultStrict() MatchComparer {
return OnlyStrict(DefaultSpec())
}

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//go:build darwin
/*
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.
*/
package platforms
import (
"runtime"
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
// DefaultSpec returns the current platform's default platform specification.
func DefaultSpec() specs.Platform {
return specs.Platform{
OS: runtime.GOOS,
Architecture: runtime.GOARCH,
// The Variant field will be empty if arch != ARM.
Variant: cpuVariant(),
}
}
// Default returns the default matcher for the platform.
func Default() MatchComparer {
return Ordered(DefaultSpec(), specs.Platform{
// darwin runtime also supports Linux binary via runu/LKL
OS: "linux",
Architecture: runtime.GOARCH,
})
}

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/*
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.
*/
package platforms
import (
"runtime"
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
// DefaultSpec returns the current platform's default platform specification.
func DefaultSpec() specs.Platform {
return specs.Platform{
OS: runtime.GOOS,
Architecture: runtime.GOARCH,
// The Variant field will be empty if arch != ARM.
Variant: cpuVariant(),
}
}
// Default returns the default matcher for the platform.
func Default() MatchComparer {
return Ordered(DefaultSpec(), specs.Platform{
OS: "linux",
Architecture: runtime.GOARCH,
// The Variant field will be empty if arch != ARM.
Variant: cpuVariant(),
})
}

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//go:build !windows && !darwin && !freebsd
/*
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.
*/
package platforms
import (
"runtime"
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
// DefaultSpec returns the current platform's default platform specification.
func DefaultSpec() specs.Platform {
return specs.Platform{
OS: runtime.GOOS,
Architecture: runtime.GOARCH,
// The Variant field will be empty if arch != ARM.
Variant: cpuVariant(),
}
}
// Default returns the default matcher for the platform.
func Default() MatchComparer {
return Only(DefaultSpec())
}

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/*
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.
*/
package platforms
import (
"fmt"
"runtime"
"strconv"
"strings"
"github.com/Microsoft/hcsshim/osversion"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"golang.org/x/sys/windows"
)
// DefaultSpec returns the current platform's default platform specification.
func DefaultSpec() specs.Platform {
major, minor, build := windows.RtlGetNtVersionNumbers()
return specs.Platform{
OS: runtime.GOOS,
Architecture: runtime.GOARCH,
OSVersion: fmt.Sprintf("%d.%d.%d", major, minor, build),
// The Variant field will be empty if arch != ARM.
Variant: cpuVariant(),
}
}
type windowsmatcher struct {
specs.Platform
osVersionPrefix string
defaultMatcher Matcher
}
// Match matches platform with the same windows major, minor
// and build version.
func (m windowsmatcher) Match(p specs.Platform) bool {
match := m.defaultMatcher.Match(p)
if match && m.OS == "windows" {
// HPC containers do not have OS version filled
if p.OSVersion == "" {
return true
}
hostOsVersion := GetOsVersion(m.osVersionPrefix)
ctrOsVersion := GetOsVersion(p.OSVersion)
return osversion.CheckHostAndContainerCompat(hostOsVersion, ctrOsVersion)
}
return match
}
func GetOsVersion(osVersionPrefix string) osversion.OSVersion {
parts := strings.Split(osVersionPrefix, ".")
if len(parts) < 3 {
return osversion.OSVersion{}
}
majorVersion, _ := strconv.Atoi(parts[0])
minorVersion, _ := strconv.Atoi(parts[1])
buildNumber, _ := strconv.Atoi(parts[2])
return osversion.OSVersion{
MajorVersion: uint8(majorVersion),
MinorVersion: uint8(minorVersion),
Build: uint16(buildNumber),
}
}
// Less sorts matched platforms in front of other platforms.
// For matched platforms, it puts platforms with larger revision
// number in front.
func (m windowsmatcher) Less(p1, p2 specs.Platform) bool {
m1, m2 := m.Match(p1), m.Match(p2)
if m1 && m2 {
r1, r2 := revision(p1.OSVersion), revision(p2.OSVersion)
return r1 > r2
}
return m1 && !m2
}
func revision(v string) int {
parts := strings.Split(v, ".")
if len(parts) < 4 {
return 0
}
r, err := strconv.Atoi(parts[3])
if err != nil {
return 0
}
return r
}
func prefix(v string) string {
parts := strings.Split(v, ".")
if len(parts) < 4 {
return v
}
return strings.Join(parts[0:3], ".")
}
// Default returns the current platform's default platform specification.
func Default() MatchComparer {
return Only(DefaultSpec())
}

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/*
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.
*/
package platforms
import "errors"
// These errors mirror the errors defined in [github.com/containerd/containerd/errdefs],
// however, they are not exported as they are not expected to be used as sentinel
// errors by consumers of this package.
//
//nolint:unused // not all errors are used on all platforms.
var (
errNotFound = errors.New("not found")
errInvalidArgument = errors.New("invalid argument")
errNotImplemented = errors.New("not implemented")
)

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/*
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.
*/
// Package platforms provides a toolkit for normalizing, matching and
// specifying container platforms.
//
// Centered around OCI platform specifications, we define a string-based
// specifier syntax that can be used for user input. With a specifier, users
// only need to specify the parts of the platform that are relevant to their
// context, providing an operating system or architecture or both.
//
// How do I use this package?
//
// The vast majority of use cases should simply use the match function with
// user input. The first step is to parse a specifier into a matcher:
//
// m, err := Parse("linux")
// if err != nil { ... }
//
// Once you have a matcher, use it to match against the platform declared by a
// component, typically from an image or runtime. Since extracting an images
// platform is a little more involved, we'll use an example against the
// platform default:
//
// if ok := m.Match(Default()); !ok { /* doesn't match */ }
//
// This can be composed in loops for resolving runtimes or used as a filter for
// fetch and select images.
//
// More details of the specifier syntax and platform spec follow.
//
// # Declaring Platform Support
//
// Components that have strict platform requirements should use the OCI
// platform specification to declare their support. Typically, this will be
// images and runtimes that should make these declaring which platform they
// support specifically. This looks roughly as follows:
//
// type Platform struct {
// Architecture string
// OS string
// Variant string
// }
//
// Most images and runtimes should at least set Architecture and OS, according
// to their GOARCH and GOOS values, respectively (follow the OCI image
// specification when in doubt). ARM should set variant under certain
// discussions, which are outlined below.
//
// # Platform Specifiers
//
// While the OCI platform specifications provide a tool for components to
// specify structured information, user input typically doesn't need the full
// context and much can be inferred. To solve this problem, we introduced
// "specifiers". A specifier has the format
// `<os>|<arch>|<os>/<arch>[/<variant>]`. The user can provide either the
// operating system or the architecture or both.
//
// An example of a common specifier is `linux/amd64`. If the host has a default
// of runtime that matches this, the user can simply provide the component that
// matters. For example, if a image provides amd64 and arm64 support, the
// operating system, `linux` can be inferred, so they only have to provide
// `arm64` or `amd64`. Similar behavior is implemented for operating systems,
// where the architecture may be known but a runtime may support images from
// different operating systems.
//
// # Normalization
//
// Because not all users are familiar with the way the Go runtime represents
// platforms, several normalizations have been provided to make this package
// easier to user.
//
// The following are performed for architectures:
//
// Value Normalized
// aarch64 arm64
// armhf arm
// armel arm/v6
// i386 386
// x86_64 amd64
// x86-64 amd64
//
// We also normalize the operating system `macos` to `darwin`.
//
// # ARM Support
//
// To qualify ARM architecture, the Variant field is used to qualify the arm
// version. The most common arm version, v7, is represented without the variant
// unless it is explicitly provided. This is treated as equivalent to armhf. A
// previous architecture, armel, will be normalized to arm/v6.
//
// Similarly, the most common arm64 version v8, and most common amd64 version v1
// are represented without the variant.
//
// While these normalizations are provided, their support on arm platforms has
// not yet been fully implemented and tested.
package platforms
import (
"fmt"
"path"
"regexp"
"runtime"
"strconv"
"strings"
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
var (
specifierRe = regexp.MustCompile(`^[A-Za-z0-9_-]+$`)
)
// Platform is a type alias for convenience, so there is no need to import image-spec package everywhere.
type Platform = specs.Platform
// Matcher matches platforms specifications, provided by an image or runtime.
type Matcher interface {
Match(platform specs.Platform) bool
}
// NewMatcher returns a simple matcher based on the provided platform
// specification. The returned matcher only looks for equality based on os,
// architecture and variant.
//
// One may implement their own matcher if this doesn't provide the required
// functionality.
//
// Applications should opt to use `Match` over directly parsing specifiers.
func NewMatcher(platform specs.Platform) Matcher {
return newDefaultMatcher(platform)
}
type matcher struct {
specs.Platform
}
func (m *matcher) Match(platform specs.Platform) bool {
normalized := Normalize(platform)
return m.OS == normalized.OS &&
m.Architecture == normalized.Architecture &&
m.Variant == normalized.Variant
}
func (m *matcher) String() string {
return Format(m.Platform)
}
// ParseAll parses a list of platform specifiers into a list of platform.
func ParseAll(specifiers []string) ([]specs.Platform, error) {
platforms := make([]specs.Platform, len(specifiers))
for i, s := range specifiers {
p, err := Parse(s)
if err != nil {
return nil, fmt.Errorf("invalid platform %s: %w", s, err)
}
platforms[i] = p
}
return platforms, nil
}
// Parse parses the platform specifier syntax into a platform declaration.
//
// Platform specifiers are in the format `<os>|<arch>|<os>/<arch>[/<variant>]`.
// The minimum required information for a platform specifier is the operating
// system or architecture. If there is only a single string (no slashes), the
// value will be matched against the known set of operating systems, then fall
// back to the known set of architectures. The missing component will be
// inferred based on the local environment.
func Parse(specifier string) (specs.Platform, error) {
if strings.Contains(specifier, "*") {
// TODO(stevvooe): need to work out exact wildcard handling
return specs.Platform{}, fmt.Errorf("%q: wildcards not yet supported: %w", specifier, errInvalidArgument)
}
parts := strings.Split(specifier, "/")
for _, part := range parts {
if !specifierRe.MatchString(part) {
return specs.Platform{}, fmt.Errorf("%q is an invalid component of %q: platform specifier component must match %q: %w", part, specifier, specifierRe.String(), errInvalidArgument)
}
}
var p specs.Platform
switch len(parts) {
case 1:
// in this case, we will test that the value might be an OS, then look
// it up. If it is not known, we'll treat it as an architecture. Since
// we have very little information about the platform here, we are
// going to be a little more strict if we don't know about the argument
// value.
p.OS = normalizeOS(parts[0])
if isKnownOS(p.OS) {
// picks a default architecture
p.Architecture = runtime.GOARCH
if p.Architecture == "arm" && cpuVariant() != "v7" {
p.Variant = cpuVariant()
}
if p.OS == "windows" {
p.OSVersion = GetWindowsOsVersion()
}
return p, nil
}
p.Architecture, p.Variant = normalizeArch(parts[0], "")
if p.Architecture == "arm" && p.Variant == "v7" {
p.Variant = ""
}
if isKnownArch(p.Architecture) {
p.OS = runtime.GOOS
return p, nil
}
return specs.Platform{}, fmt.Errorf("%q: unknown operating system or architecture: %w", specifier, errInvalidArgument)
case 2:
// In this case, we treat as a regular os/arch pair. We don't care
// about whether or not we know of the platform.
p.OS = normalizeOS(parts[0])
p.Architecture, p.Variant = normalizeArch(parts[1], "")
if p.Architecture == "arm" && p.Variant == "v7" {
p.Variant = ""
}
if p.OS == "windows" {
p.OSVersion = GetWindowsOsVersion()
}
return p, nil
case 3:
// we have a fully specified variant, this is rare
p.OS = normalizeOS(parts[0])
p.Architecture, p.Variant = normalizeArch(parts[1], parts[2])
if p.Architecture == "arm64" && p.Variant == "" {
p.Variant = "v8"
}
if p.OS == "windows" {
p.OSVersion = GetWindowsOsVersion()
}
return p, nil
}
return specs.Platform{}, fmt.Errorf("%q: cannot parse platform specifier: %w", specifier, errInvalidArgument)
}
// MustParse is like Parses but panics if the specifier cannot be parsed.
// Simplifies initialization of global variables.
func MustParse(specifier string) specs.Platform {
p, err := Parse(specifier)
if err != nil {
panic("platform: Parse(" + strconv.Quote(specifier) + "): " + err.Error())
}
return p
}
// Format returns a string specifier from the provided platform specification.
func Format(platform specs.Platform) string {
if platform.OS == "" {
return "unknown"
}
return path.Join(platform.OS, platform.Architecture, platform.Variant)
}
// Normalize validates and translate the platform to the canonical value.
//
// For example, if "Aarch64" is encountered, we change it to "arm64" or if
// "x86_64" is encountered, it becomes "amd64".
func Normalize(platform specs.Platform) specs.Platform {
platform.OS = normalizeOS(platform.OS)
platform.Architecture, platform.Variant = normalizeArch(platform.Architecture, platform.Variant)
return platform
}

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//go:build !windows
/*
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.
*/
package platforms
import (
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
// NewMatcher returns the default Matcher for containerd
func newDefaultMatcher(platform specs.Platform) Matcher {
return &matcher{
Platform: Normalize(platform),
}
}
func GetWindowsOsVersion() string {
return ""
}

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/*
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.
*/
package platforms
import (
"fmt"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"golang.org/x/sys/windows"
)
// NewMatcher returns a Windows matcher that will match on osVersionPrefix if
// the platform is Windows otherwise use the default matcher
func newDefaultMatcher(platform specs.Platform) Matcher {
prefix := prefix(platform.OSVersion)
return windowsmatcher{
Platform: platform,
osVersionPrefix: prefix,
defaultMatcher: &matcher{
Platform: Normalize(platform),
},
}
}
func GetWindowsOsVersion() string {
major, minor, build := windows.RtlGetNtVersionNumbers()
return fmt.Sprintf("%d.%d.%d", major, minor, build)
}