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|
package version
import (
"bufio"
"errors"
"fmt"
"os"
"runtime"
"runtime/debug"
"strconv"
"strings"
)
type VersionInfo struct {
Version string
Commit string
}
// Version determines version and commit information based on multiple data sources:
// - Version information dynamically added by `git archive` in the remaining to parameters.
// - A hardcoded version number passed as first parameter.
// - Commit information added to the binary by `go build`.
//
// It's supposed to be called like this in combination with setting the `export-subst` attribute for the corresponding
// file in .gitattributes:
//
// var Version = version.Version("1.0.0-rc2", "$Format:%(describe)$", "$Format:%H$")
//
// When exported using `git archive`, the placeholders are replaced in the file and this version information is
// preferred. Otherwise the hardcoded version is used and augmented with commit information from the build metadata.
func Version(version, gitDescribe, gitHash string) *VersionInfo {
const hashLen = 7 // Same truncation length for the commit hash as used by git describe.
if !strings.HasPrefix(gitDescribe, "$") && !strings.HasPrefix(gitHash, "$") {
if strings.HasPrefix(gitDescribe, "%") {
// Only Git 2.32+ supports %(describe), older versions don't expand it but keep it as-is.
// Fall back to the hardcoded version augmented with the commit hash.
gitDescribe = version
if len(gitHash) >= hashLen {
gitDescribe += "-g" + gitHash[:hashLen]
}
}
return &VersionInfo{
Version: gitDescribe,
Commit: gitHash,
}
} else {
commit := ""
if info, ok := debug.ReadBuildInfo(); ok {
modified := false
for _, setting := range info.Settings {
switch setting.Key {
case "vcs.revision":
commit = setting.Value
case "vcs.modified":
modified, _ = strconv.ParseBool(setting.Value)
}
}
if len(commit) >= hashLen {
version += "-g" + commit[:hashLen]
if modified {
version += "-dirty"
commit += " (modified)"
}
}
}
return &VersionInfo{
Version: version,
Commit: commit,
}
}
}
// Print writes verbose version output to stdout.
func (v *VersionInfo) Print() {
fmt.Println("Icinga DB version:", v.Version)
fmt.Println()
fmt.Println("Build information:")
fmt.Printf(" Go version: %s (%s, %s)\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)
if v.Commit != "" {
fmt.Println(" Git commit:", v.Commit)
}
if r, err := readOsRelease(); err == nil {
fmt.Println()
fmt.Println("System information:")
fmt.Println(" Platform:", r.Name)
fmt.Println(" Platform version:", r.DisplayVersion())
}
}
// osRelease contains the information obtained from the os-release file.
type osRelease struct {
Name string
Version string
VersionId string
BuildId string
}
// DisplayVersion returns the most suitable version information for display purposes.
func (o *osRelease) DisplayVersion() string {
if o.Version != "" {
// Most distributions set VERSION
return o.Version
} else if o.VersionId != "" {
// Some only set VERSION_ID (Alpine Linux for example)
return o.VersionId
} else if o.BuildId != "" {
// Others only set BUILD_ID (Arch Linux for example)
return o.BuildId
} else {
return "(unknown)"
}
}
// readOsRelease reads and parses the os-release file.
func readOsRelease() (*osRelease, error) {
for _, path := range []string{"/etc/os-release", "/usr/lib/os-release"} {
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
continue // Try next path.
} else {
return nil, err
}
}
o := &osRelease{
Name: "Linux", // Suggested default as per os-release(5) man page.
}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "#") {
continue // Ignore comment.
}
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
continue // Ignore empty or possibly malformed line.
}
key := parts[0]
val := parts[1]
// Unquote strings. This isn't fully compliant with the specification which allows using some shell escape
// sequences. However, typically quotes are only used to allow whitespace within the value.
if len(val) >= 2 && (val[0] == '"' || val[0] == '\'') && val[0] == val[len(val)-1] {
val = val[1 : len(val)-1]
}
switch key {
case "NAME":
o.Name = val
case "VERSION":
o.Version = val
case "VERSION_ID":
o.VersionId = val
case "BUILD_ID":
o.BuildId = val
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return o, nil
}
return nil, errors.New("os-release file not found")
}
|
