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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 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 strace_test
import (
"os"
"os/exec"
"path/filepath"
"testing"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/osutil/strace"
"github.com/snapcore/snapd/osutil/user"
"github.com/snapcore/snapd/testutil"
)
// Hook up check.v1 into the "go test" runner
func Test(t *testing.T) { TestingT(t) }
type straceSuite struct {
rootdir string
mockSudo *testutil.MockCmd
mockStrace *testutil.MockCmd
}
var _ = Suite(&straceSuite{})
func (s *straceSuite) SetUpTest(c *C) {
s.rootdir = c.MkDir()
dirs.SetRootDir(s.rootdir)
s.mockSudo = testutil.MockCommand(c, "sudo", "")
s.mockStrace = testutil.MockCommand(c, "strace", "")
}
func (s *straceSuite) TearDownTest(c *C) {
dirs.SetRootDir("/")
s.mockSudo.Restore()
s.mockStrace.Restore()
}
func (s *straceSuite) TestStraceCommandHappy(c *C) {
cmd, err := strace.Command(nil)
c.Assert(err, IsNil)
c.Assert(cmd.Path, Equals, s.mockSudo.Exe())
c.Assert(cmd.Args, DeepEquals, []string{
s.mockSudo.Exe(), "--",
s.mockStrace.Exe(),
"-f",
"-e", strace.ExcludedSyscalls,
})
cmd, err = strace.CommandWithTraceePid(123, nil)
c.Assert(err, IsNil)
c.Assert(cmd.Path, Equals, s.mockSudo.Exe())
c.Assert(cmd.Args, DeepEquals, []string{
s.mockSudo.Exe(), "--",
s.mockStrace.Exe(),
"-f",
"-e", strace.ExcludedSyscalls,
"-p", "123",
})
}
func (s *straceSuite) TestStraceCommandHappyFromSnap(c *C) {
straceStaticPath := filepath.Join(dirs.SnapMountDir, "strace-static", "current", "bin", "strace")
err := os.MkdirAll(filepath.Dir(straceStaticPath), 0755)
c.Assert(err, IsNil)
mockStraceStatic := testutil.MockCommand(c, straceStaticPath, "")
defer mockStraceStatic.Restore()
cmd, err := strace.Command(nil)
c.Assert(err, IsNil)
c.Check(cmd.Path, Equals, s.mockSudo.Exe())
c.Check(cmd.Args, DeepEquals, []string{
s.mockSudo.Exe(), "--",
mockStraceStatic.Exe(),
"-f",
"-e", strace.ExcludedSyscalls,
})
}
func (s *straceSuite) TestStraceCommandNoSudo(c *C) {
tmp := c.MkDir()
if user.GetentBased {
getEntPath, err := exec.LookPath("getent")
c.Assert(err, IsNil)
err = os.Symlink(getEntPath, filepath.Join(tmp, "getent"))
c.Assert(err, IsNil)
}
origPath := os.Getenv("PATH")
defer func() { os.Setenv("PATH", origPath) }()
os.Setenv("PATH", tmp)
_, err := strace.Command(nil)
c.Assert(err, ErrorMatches, `cannot use strace without sudo: exec: "sudo": executable file not found in \$PATH`)
}
func (s *straceSuite) TestStraceCommandNoStrace(c *C) {
tmp := c.MkDir()
if user.GetentBased {
getEntPath, err := exec.LookPath("getent")
c.Assert(err, IsNil)
err = os.Symlink(getEntPath, filepath.Join(tmp, "getent"))
c.Assert(err, IsNil)
}
origPath := os.Getenv("PATH")
defer func() { os.Setenv("PATH", origPath) }()
os.Setenv("PATH", tmp)
err := os.WriteFile(filepath.Join(tmp, "sudo"), nil, 0755)
c.Assert(err, IsNil)
_, err = strace.Command(nil)
c.Assert(err, ErrorMatches, `cannot find an installed strace, please try 'snap install strace-static'`)
}
func (s *straceSuite) TestTraceExecCommand(c *C) {
cmd, err := strace.TraceExecCommandForPid(123, "/run/snapd/strace.log")
c.Assert(err, IsNil)
c.Assert(cmd.Path, Equals, s.mockSudo.Exe())
c.Assert(cmd.Args, DeepEquals, []string{
s.mockSudo.Exe(), "--",
s.mockStrace.Exe(),
"-f",
"-e", strace.ExcludedSyscalls,
// timing specific trace
"-ttt",
"-e", "trace=execve,execveat",
"-o", "/run/snapd/strace.log",
"-p", "123",
})
}
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