github.com/containerd/containerd@v22.0.0-20200918172823-438c87b8e050+incompatible/platforms/database.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package platforms
    18  
    19  import (
    20  	"runtime"
    21  	"strings"
    22  )
    23  
    24  // isLinuxOS returns true if the operating system is Linux.
    25  //
    26  // The OS value should be normalized before calling this function.
    27  func isLinuxOS(os string) bool {
    28  	return os == "linux"
    29  }
    30  
    31  // These function are generated from https://golang.org/src/go/build/syslist.go.
    32  //
    33  // We use switch statements because they are slightly faster than map lookups
    34  // and use a little less memory.
    35  
    36  // isKnownOS returns true if we know about the operating system.
    37  //
    38  // The OS value should be normalized before calling this function.
    39  func isKnownOS(os string) bool {
    40  	switch os {
    41  	case "aix", "android", "darwin", "dragonfly", "freebsd", "hurd", "illumos", "js", "linux", "nacl", "netbsd", "openbsd", "plan9", "solaris", "windows", "zos":
    42  		return true
    43  	}
    44  	return false
    45  }
    46  
    47  // isArmArch returns true if the architecture is ARM.
    48  //
    49  // The arch value should be normalized before being passed to this function.
    50  func isArmArch(arch string) bool {
    51  	switch arch {
    52  	case "arm", "arm64":
    53  		return true
    54  	}
    55  	return false
    56  }
    57  
    58  // isKnownArch returns true if we know about the architecture.
    59  //
    60  // The arch value should be normalized before being passed to this function.
    61  func isKnownArch(arch string) bool {
    62  	switch arch {
    63  	case "386", "amd64", "amd64p32", "arm", "armbe", "arm64", "arm64be", "ppc64", "ppc64le", "mips", "mipsle", "mips64", "mips64le", "mips64p32", "mips64p32le", "ppc", "riscv", "riscv64", "s390", "s390x", "sparc", "sparc64", "wasm":
    64  		return true
    65  	}
    66  	return false
    67  }
    68  
    69  func normalizeOS(os string) string {
    70  	if os == "" {
    71  		return runtime.GOOS
    72  	}
    73  	os = strings.ToLower(os)
    74  
    75  	switch os {
    76  	case "macos":
    77  		os = "darwin"
    78  	}
    79  	return os
    80  }
    81  
    82  // normalizeArch normalizes the architecture.
    83  func normalizeArch(arch, variant string) (string, string) {
    84  	arch, variant = strings.ToLower(arch), strings.ToLower(variant)
    85  	switch arch {
    86  	case "i386":
    87  		arch = "386"
    88  		variant = ""
    89  	case "x86_64", "x86-64":
    90  		arch = "amd64"
    91  		variant = ""
    92  	case "aarch64", "arm64":
    93  		arch = "arm64"
    94  		switch variant {
    95  		case "8", "v8":
    96  			variant = ""
    97  		}
    98  	case "armhf":
    99  		arch = "arm"
   100  		variant = "v7"
   101  	case "armel":
   102  		arch = "arm"
   103  		variant = "v6"
   104  	case "arm":
   105  		switch variant {
   106  		case "", "7":
   107  			variant = "v7"
   108  		case "5", "6", "8":
   109  			variant = "v" + variant
   110  		}
   111  	}
   112  
   113  	return arch, variant
   114  }