github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/cli/cmd/plugin/platform.go (about)

     1  /*
     2  Copyright (C) 2022-2023 ApeCloud Co., Ltd
     3  
     4  This file is part of KubeBlocks project
     5  
     6  This program is free software: you can redistribute it and/or modify
     7  it under the terms of the GNU Affero General Public License as published by
     8  the Free Software Foundation, either version 3 of the License, or
     9  (at your option) any later version.
    10  
    11  This program is distributed in the hope that it will be useful
    12  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  GNU Affero General Public License for more details.
    15  
    16  You should have received a copy of the GNU Affero General Public License
    17  along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18  */
    19  
    20  package plugin
    21  
    22  import (
    23  	"fmt"
    24  	"os"
    25  	"runtime"
    26  
    27  	"github.com/pkg/errors"
    28  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    29  	"k8s.io/apimachinery/pkg/labels"
    30  	"k8s.io/klog/v2"
    31  )
    32  
    33  // GetMatchingPlatform finds the platform spec in the specified plugin that
    34  // matches the os/arch of the current machine (can be overridden via KREW_OS
    35  // and/or KREW_ARCH).
    36  func GetMatchingPlatform(platforms []Platform) (Platform, bool, error) {
    37  	return matchPlatform(platforms, OSArch())
    38  }
    39  
    40  // matchPlatform returns the first matching platform to given os/arch.
    41  func matchPlatform(platforms []Platform, env OSArchPair) (Platform, bool, error) {
    42  	envLabels := labels.Set{
    43  		"os":   env.OS,
    44  		"arch": env.Arch,
    45  	}
    46  	klog.V(2).Infof("Matching platform for labels(%v)", envLabels)
    47  
    48  	for i, platform := range platforms {
    49  		sel, err := metav1.LabelSelectorAsSelector(platform.Selector)
    50  		if err != nil {
    51  			return Platform{}, false, errors.Wrap(err, "failed to compile label selector")
    52  		}
    53  		if sel.Matches(envLabels) {
    54  			klog.V(2).Infof("Found matching platform with index (%d)", i)
    55  			return platform, true, nil
    56  		}
    57  	}
    58  	return Platform{}, false, nil
    59  }
    60  
    61  // OSArchPair is wrapper around operating system and architecture
    62  type OSArchPair struct {
    63  	OS, Arch string
    64  }
    65  
    66  // String converts environment into a string
    67  func (p OSArchPair) String() string {
    68  	return fmt.Sprintf("%s/%s", p.OS, p.Arch)
    69  }
    70  
    71  // OSArch returns the OS/arch combination to be used on the current system. It
    72  // can be overridden by setting KREW_OS and/or KREW_ARCH environment variables.
    73  func OSArch() OSArchPair {
    74  	return OSArchPair{
    75  		OS:   getEnvOrDefault("KBLCI_OS", runtime.GOOS),
    76  		Arch: getEnvOrDefault("KBCLI_ARCH", runtime.GOARCH),
    77  	}
    78  }
    79  
    80  func getEnvOrDefault(env, absent string) string {
    81  	v := os.Getenv(env)
    82  	if v != "" {
    83  		return v
    84  	}
    85  	return absent
    86  }