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buildid.go
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buildid.go
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// Copyright 2021 The Parca Authors
// 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 buildid
import (
"debug/elf"
"encoding/hex"
"fmt"
"io"
"os"
"github.com/cespare/xxhash/v2"
gobuildid "github.com/parca-dev/parca-agent/internal/go/buildid"
"github.com/parca-dev/parca-agent/internal/pprof/elfexec"
)
func BuildID(path string) (string, error) {
f, err := elf.Open(path)
if err != nil {
return "", fmt.Errorf("failed to open elf: %w", err)
}
hasBuildIDSection := false
for _, s := range f.Sections {
if s.Name == ".note.go.buildid" {
hasBuildIDSection = true
}
}
if hasBuildIDSection {
f.Close()
id, err := gobuildid.ReadFile(path)
if err != nil {
return elfBuildID(path)
}
return hex.EncodeToString([]byte(id)), nil
}
f.Close()
return elfBuildID(path)
}
func elfBuildID(file string) (string, error) {
f, err := os.Open(file)
if err != nil {
return "", fmt.Errorf("open file: %w", err)
}
b, err := elfexec.GetBuildID(f)
if err != nil {
return "", fmt.Errorf("get elf build id: %w", err)
}
if err := f.Close(); err != nil {
return "", fmt.Errorf("close elf file binary: %w", err)
}
if b == nil {
f, err = os.Open(file)
if err != nil {
return "", fmt.Errorf("open file to read program bytes: %w", err)
}
defer f.Close()
// GNU build ID doesn't exist, so we hash the .text section. This
// section typically contains the executable code.
ef, err := elf.NewFile(f)
if err != nil {
return "", fmt.Errorf("open file as elf file: %w", err)
}
h := xxhash.New()
if _, err := io.Copy(h, ef.Section(".text").Open()); err != nil {
return "", fmt.Errorf("hash elf .text section: %w", err)
}
return hex.EncodeToString(h.Sum(nil)), nil
}
return hex.EncodeToString(b), nil
}