version.go

Documentation: go.opencensus.io/internal/check

     1  // Copyright 2018, OpenCensus Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Command version checks that the version string matches the latest Git tag.
    16  // This is expected to pass only on the master branch.
    17  package main
    18  
    19  import (
    20  	"bytes"
    21  	"fmt"
    22  	"log"
    23  	"os"
    24  	"os/exec"
    25  	"sort"
    26  	"strconv"
    27  	"strings"
    28  
    29  	opencensus "go.opencensus.io"
    30  )
    31  
    32  func main() {
    33  	cmd := exec.Command("git", "tag")
    34  	var buf bytes.Buffer
    35  	cmd.Stdout = &buf
    36  	err := cmd.Run()
    37  	if err != nil {
    38  		log.Fatal(err)
    39  	}
    40  	var versions []version
    41  	for _, vStr := range strings.Split(buf.String(), "\n") {
    42  		if len(vStr) == 0 {
    43  			continue
    44  		}
    45  		// ignore pre-release versions
    46  		if isPreRelease(vStr) {
    47  			continue
    48  		}
    49  		versions = append(versions, parseVersion(vStr))
    50  	}
    51  	sort.Slice(versions, func(i, j int) bool {
    52  		return versionLess(versions[i], versions[j])
    53  	})
    54  	latest := versions[len(versions)-1]
    55  	codeVersion := parseVersion("v" + opencensus.Version())
    56  	if !versionLess(latest, codeVersion) {
    57  		fmt.Printf("exporter.Version is out of date with Git tags. Got %s; want something greater than %s\n", opencensus.Version(), latest)
    58  		os.Exit(1)
    59  	}
    60  	fmt.Printf("exporter.Version is up-to-date: %s\n", opencensus.Version())
    61  }
    62  
    63  type version [3]int
    64  
    65  func versionLess(v1, v2 version) bool {
    66  	for c := 0; c < 3; c++ {
    67  		if diff := v1[c] - v2[c]; diff != 0 {
    68  			return diff < 0
    69  		}
    70  	}
    71  	return false
    72  }
    73  
    74  func isPreRelease(vStr string) bool {
    75  	split := strings.Split(vStr[1:], ".")
    76  	return strings.Contains(split[2], "-")
    77  }
    78  
    79  func parseVersion(vStr string) version {
    80  	split := strings.Split(vStr[1:], ".")
    81  	var (
    82  		v   version
    83  		err error
    84  	)
    85  	for i := 0; i < 3; i++ {
    86  		v[i], err = strconv.Atoi(split[i])
    87  		if err != nil {
    88  			fmt.Printf("Unrecognized version tag %q: %s\n", vStr, err)
    89  			os.Exit(2)
    90  		}
    91  	}
    92  	return v
    93  }
    94  
    95  func (v version) String() string {
    96  	return fmt.Sprintf("%d.%d.%d", v[0], v[1], v[2])
    97  }
    98
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