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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil_test
import (
"encoding/hex"
"os"
"os/exec"
"path/filepath"
"regexp"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/testutil"
)
type buildIDSuite struct {
testutil.BaseTest
}
var _ = Suite(&buildIDSuite{})
var truePath = osutil.LookPathDefault("true", "/bin/true")
var falsePath = osutil.LookPathDefault("false", "/bin/false")
var gccPath = osutil.LookPathDefault("gcc", "/usr/bin/gcc")
func (s *buildIDSuite) SetUpTest(c *C) {
s.BaseTest.SetUpTest(c)
}
func buildID(c *C, fname string) string {
// XXX Host's "file" command may be too old to know about Go BuildID or
// hexstring GNU BuildID, use with caution. Use "-L" to follow symlinks,
// to also cover e.g. Ubuntu 25.10 where /bin/true is a symlink to gnutrue.
output, err := exec.Command("file", "-L", fname).CombinedOutput()
c.Assert(err, IsNil)
c.Logf("file output: %q", string(output))
// BuildID can look like:
// BuildID[sha1]=443877f9ec13c82365478130fc95cb5ff5181912
// BuildID[md5/uuid]=ae38cdf243d2111064dfee99dfc30013
// Go BuildID=YDAw4RLIEKpyxl90JbFQ/s9mld--03zAIIQ1tGb_5/aL-yPp ...
re := regexp.MustCompile(`BuildID(\[.*\]|)=([a-zA-Z0-9/_-]+)`)
matches := re.FindStringSubmatch(string(output))
c.Assert(matches, HasLen, 3)
return matches[2]
}
func (s *buildIDSuite) TestReadBuildID(c *C) {
for _, fname := range []string{truePath, falsePath} {
id, err := osutil.ReadBuildID(fname)
c.Assert(err, IsNil)
c.Assert(id, Equals, buildID(c, fname), Commentf("executable: %s", fname))
}
}
func (s *buildIDSuite) TestReadBuildIDNoID(c *C) {
stripedTruth := filepath.Join(c.MkDir(), "true")
osutil.CopyFile(truePath, stripedTruth, 0)
output, err := exec.Command("strip", "-R", ".note.gnu.build-id", stripedTruth).CombinedOutput()
c.Assert(string(output), Equals, "")
c.Assert(err, IsNil)
id, err := osutil.ReadBuildID(stripedTruth)
c.Assert(err, Equals, osutil.ErrNoBuildID)
c.Assert(id, Equals, "")
}
func (s *buildIDSuite) TestReadBuildIDmd5(c *C) {
if !osutil.FileExists(gccPath) {
c.Skip("No gcc found")
}
md5Truth := filepath.Join(c.MkDir(), "true")
err := os.WriteFile(md5Truth+".c", []byte(`int main(){return 0;}`), 0644)
c.Assert(err, IsNil)
output, err := exec.Command(gccPath, "-Wl,--build-id=md5", "-xc", md5Truth+".c", "-o", md5Truth).CombinedOutput()
c.Assert(string(output), Equals, "")
c.Assert(err, IsNil)
id, err := osutil.ReadBuildID(md5Truth)
c.Assert(err, IsNil)
c.Assert(id, Equals, buildID(c, md5Truth))
}
func (s *buildIDSuite) TestReadBuildIDFixedELF(c *C) {
if !osutil.FileExists(gccPath) {
c.Skip("No gcc found")
}
md5Truth := filepath.Join(c.MkDir(), "true")
err := os.WriteFile(md5Truth+".c", []byte(`int main(){return 0;}`), 0644)
c.Assert(err, IsNil)
output, err := exec.Command(gccPath, "-Wl,--build-id=0xdeadcafe", "-xc", md5Truth+".c", "-o", md5Truth).CombinedOutput()
c.Assert(string(output), Equals, "")
c.Assert(err, IsNil)
id, err := osutil.ReadBuildID(md5Truth)
c.Assert(err, IsNil)
// XXX cannot call buildID() as the host's 'file' command may be too old
// to know about hexstring format of GNU BuildID
c.Assert(id, Equals, "deadcafe")
}
func (s *buildIDSuite) TestMyBuildID(c *C) {
restore := osutil.MockOsReadlink(func(string) (string, error) {
return truePath, nil
})
defer restore()
id, err := osutil.MyBuildID()
c.Assert(err, IsNil)
c.Check(id, Equals, buildID(c, truePath))
}
func (s *buildIDSuite) TestReadBuildGo(c *C) {
if os.Getenv("DH_GOPKG") != "" {
// Failure reason is unknown but only reproducible
// inside the any 21.04+ sbuild/pbuilder build
// environment during the build (with dh-golang).
//
// Not reproducible outside of dpkg-buildpackage.
c.Skip("This `go build` fails inside the dpkg-buildpackage environment with `loadinternal: cannot find runtime/cgo`")
}
tmpdir := c.MkDir()
goTruth := filepath.Join(tmpdir, "true")
err := os.WriteFile(goTruth+".go", []byte(`package main; func main(){}`), 0644)
c.Assert(err, IsNil)
// force specific Go BuildID
//
// XXX: note, Go toolchain, specifically 1.24+ started adding GNU BuildID by
// default which the code tries to read first
cmd := exec.Command("go", "build", "-o", goTruth, "-ldflags=-buildid=foobar", goTruth+".go")
// set custom homedir to ensure tests work in an sbuild environment
// that force a non-existing homedir
cmd.Env = append(os.Environ(), "HOME="+tmpdir)
cmd.Dir = tmpdir
output, err := cmd.CombinedOutput()
c.Assert(string(output), Equals, "")
c.Assert(err, IsNil)
id, err := osutil.ReadGoBuildID(goTruth)
c.Assert(err, IsNil)
// ReadBuildID returns a hex encoded string, however buildID()
// returns the "raw" string so we need to decode first
decoded, err := hex.DecodeString(id)
c.Assert(err, IsNil)
// XXX cannot call buildID() as the host's 'file' command may be too old
// to know about Go BuildID
c.Assert(string(decoded), Equals, "foobar")
}
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