4073aaa7a9
This isn't supported by *all* arm64 chips, but it is common enough that I think it's worth an explicit fallback. I think it will be more common for images to have arm64 support without arm support, but even if a user has an arm64 chip that does not support arm32, having it fail to run the arm32 image is an acceptable compromise (because it's non-trivial to detect arm32 support without running a binary, AFAIK). Also, before this change the failure would've simply been "no such image" instead of "failed to run" so I think it's pretty reasonable to allow it to try the additional 32bit set of images just in case one of them actually does work (like it will on many popular chips like 64bit Raspberry Pis and AWS Graviton). Signed-off-by: Tianon Gravi <admwiggin@gmail.com>
127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package platforms
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import (
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"bufio"
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"os"
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"runtime"
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"strings"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/log"
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"github.com/pkg/errors"
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)
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// Present the ARM instruction set architecture, eg: v7, v8
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var cpuVariant string
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func init() {
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if isArmArch(runtime.GOARCH) {
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cpuVariant = getCPUVariant()
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} else {
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cpuVariant = ""
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}
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}
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// For Linux, the kernel has already detected the ABI, ISA and Features.
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// So we don't need to access the ARM registers to detect platform information
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// by ourselves. We can just parse these information from /proc/cpuinfo
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func getCPUInfo(pattern string) (info string, err error) {
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if !isLinuxOS(runtime.GOOS) {
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return "", errors.Wrapf(errdefs.ErrNotImplemented, "getCPUInfo for OS %s", runtime.GOOS)
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}
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cpuinfo, err := os.Open("/proc/cpuinfo")
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if err != nil {
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return "", err
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}
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defer cpuinfo.Close()
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// Start to Parse the Cpuinfo line by line. For SMP SoC, we parse
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// the first core is enough.
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scanner := bufio.NewScanner(cpuinfo)
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for scanner.Scan() {
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newline := scanner.Text()
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list := strings.Split(newline, ":")
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if len(list) > 1 && strings.EqualFold(strings.TrimSpace(list[0]), pattern) {
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return strings.TrimSpace(list[1]), nil
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}
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}
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// Check whether the scanner encountered errors
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err = scanner.Err()
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if err != nil {
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return "", err
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}
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return "", errors.Wrapf(errdefs.ErrNotFound, "getCPUInfo for pattern: %s", pattern)
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}
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func getCPUVariant() string {
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if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
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// Windows/Darwin only supports v7 for ARM32 and v8 for ARM64 and so we can use
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// runtime.GOARCH to determine the variants
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var variant string
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switch runtime.GOARCH {
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case "arm64":
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variant = "v8"
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case "arm":
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variant = "v7"
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default:
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variant = "unknown"
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}
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return variant
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}
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variant, err := getCPUInfo("Cpu architecture")
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if err != nil {
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log.L.WithError(err).Error("failure getting variant")
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return ""
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}
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// handle edge case for Raspberry Pi ARMv6 devices (which due to a kernel quirk, report "CPU architecture: 7")
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// https://www.raspberrypi.org/forums/viewtopic.php?t=12614
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if runtime.GOARCH == "arm" && variant == "7" {
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model, err := getCPUInfo("model name")
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if err == nil && strings.HasPrefix(strings.ToLower(model), "armv6-compatible") {
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variant = "6"
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}
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}
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switch strings.ToLower(variant) {
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case "8", "aarch64":
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variant = "v8"
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case "7", "7m", "?(12)", "?(13)", "?(14)", "?(15)", "?(16)", "?(17)":
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variant = "v7"
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case "6", "6tej":
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variant = "v6"
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case "5", "5t", "5te", "5tej":
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variant = "v5"
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case "4", "4t":
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variant = "v4"
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case "3":
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variant = "v3"
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default:
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variant = "unknown"
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}
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return variant
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}
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