blob: 837cd689a079af3175926f9b14bf8ff86c62867f [file] [log] [blame]
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package debug
import (
"strings"
)
// exported from runtime
func modinfo() string
// ReadBuildInfo returns the build information embedded
// in the running binary. The information is available only
// in binaries built with module support.
func ReadBuildInfo() (info *BuildInfo, ok bool) {
return readBuildInfo(modinfo())
}
// BuildInfo represents the build information read from
// the running binary.
type BuildInfo struct {
Path string // The main package path
Main Module // The module containing the main package
Deps []*Module // Module dependencies
}
// Module represents a module.
type Module struct {
Path string // module path
Version string // module version
Sum string // checksum
Replace *Module // replaced by this module
}
func readBuildInfo(data string) (*BuildInfo, bool) {
if len(data) < 32 {
return nil, false
}
data = data[16 : len(data)-16]
const (
pathLine = "path\t"
modLine = "mod\t"
depLine = "dep\t"
repLine = "=>\t"
)
info := &BuildInfo{}
var line string
// Reverse of cmd/go/internal/modload.PackageBuildInfo
for len(data) > 0 {
i := strings.IndexByte(data, '\n')
if i < 0 {
break
}
line, data = data[:i], data[i+1:]
switch {
case strings.HasPrefix(line, pathLine):
elem := line[len(pathLine):]
info.Path = elem
case strings.HasPrefix(line, modLine):
elem := strings.Split(line[len(modLine):], "\t")
if len(elem) != 3 {
return nil, false
}
info.Main = Module{
Path: elem[0],
Version: elem[1],
Sum: elem[2],
}
case strings.HasPrefix(line, depLine):
elem := strings.Split(line[len(depLine):], "\t")
if len(elem) != 2 && len(elem) != 3 {
return nil, false
}
sum := ""
if len(elem) == 3 {
sum = elem[2]
}
info.Deps = append(info.Deps, &Module{
Path: elem[0],
Version: elem[1],
Sum: sum,
})
case strings.HasPrefix(line, repLine):
elem := strings.Split(line[len(repLine):], "\t")
if len(elem) != 3 {
return nil, false
}
last := len(info.Deps) - 1
if last < 0 {
return nil, false
}
info.Deps[last].Replace = &Module{
Path: elem[0],
Version: elem[1],
Sum: elem[2],
}
}
}
return info, true
}