asteris-llc/converge

// Copyright © 2016 Asteris, LLC
//
// 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 platform

import (
    "os/exec"
    "strings"

    "github.com/pkg/errors"
)

// OSXVers runs /usr/bin/sw_vers to get OSX version information
func (platform *Platform) OSXVers() error {
    cmd := "/usr/bin/sw_vers"
    var (
        cmdOut []byte
        err    error
    )

    if cmdOut, err = exec.Command(cmd).Output(); err != nil {
        return errors.Wrapf(err, "%s. Will be unable to parse release data", cmd)
    }
    platform.ParseOSXVersion(string(cmdOut))
    return err
}

// ParseOSXVersion Takes output from /usr/bin/sw_vers and stores in a Platform
func (platform *Platform) ParseOSXVersion(versionData string) {
    lines := strings.Split(versionData, "\n")
    for _, l := range lines {
        s := strings.Split(l, ":\t")
        if len(s) == 2 {
            switch s[0] {
            case "ProductName":
                platform.Name = s[1]
            case "ProductVersion":
                platform.Version = s[1]
            case "BuildVersion":
                platform.Build = s[1]
            }
        }
    }
}