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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 osutil_test
import (
"context"
"io"
"os/exec"
"strings"
"testing"
"time"
"gopkg.in/check.v1"
"github.com/snapcore/snapd/osutil"
)
type ctxSuite struct{}
type dumbReader struct{}
func (dumbReader) Read([]byte) (int, error) {
return 1, nil
}
var _ = check.Suite(&ctxSuite{})
func (ctxSuite) TestWriter(c *check.C) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second/100)
defer cancel()
n, err := io.Copy(osutil.ContextWriter(ctx), dumbReader{})
c.Assert(err, check.Equals, context.DeadlineExceeded)
// but we copied things until the deadline hit
c.Check(n, check.Not(check.Equals), int64(0))
}
func (ctxSuite) TestWriterDone(c *check.C) {
ctx, cancel := context.WithCancel(context.Background())
cancel()
n, err := io.Copy(osutil.ContextWriter(ctx), dumbReader{})
c.Assert(err, check.Equals, context.Canceled)
// and nothing was copied
c.Check(n, check.Equals, int64(0))
}
func (ctxSuite) TestWriterSuccess(c *check.C) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second/100)
defer cancel()
// check we can copy if we're quick
n, err := io.Copy(osutil.ContextWriter(ctx), strings.NewReader("hello"))
c.Check(err, check.IsNil)
c.Check(n, check.Equals, int64(len("hello")))
}
func (ctxSuite) TestRun(c *check.C) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second/100)
defer cancel()
cmd := exec.Command("/bin/sleep", "1")
err := osutil.RunWithContext(ctx, cmd)
c.Check(err, check.Equals, context.DeadlineExceeded)
}
func (ctxSuite) TestRunRace(c *check.C) {
if testing.Short() {
c.Skip("skippinng non-short test")
}
// first, time how long /bin/false takes
t0 := time.Now()
cmderr := exec.Command("/bin/false").Run()
dt := time.Since(t0)
// note in particular the error is not "killed"
c.Assert(cmderr, check.ErrorMatches, "exit status 1")
failedstr := cmderr.Error()
killedstr := context.DeadlineExceeded.Error()
// now run it in a loop with a deadline of exactly that
nkilled := 0
nfailed := 0
for nfailed == 0 || nkilled == 0 {
cmd := exec.Command("/bin/false")
ctx, cancel := context.WithTimeout(context.Background(), dt)
err := osutil.RunWithContext(ctx, cmd)
cancel()
switch err.Error() {
case killedstr:
nkilled++
case failedstr:
nfailed++
default:
// if the error is anything other than due to the context
// being done, or the command failing, there's a bug.
c.Fatalf("expected %q or %q, got %q", failedstr, killedstr, err)
}
}
}
func (ctxSuite) TestRunDone(c *check.C) {
ctx, cancel := context.WithCancel(context.Background())
cancel()
cmd := exec.Command("/bin/sleep", "1")
err := osutil.RunWithContext(ctx, cmd)
c.Check(err, check.Equals, context.Canceled)
}
func (ctxSuite) TestRunSuccess(c *check.C) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
cmd := exec.Command("/bin/sleep", "0.01")
err := osutil.RunWithContext(ctx, cmd)
c.Check(err, check.IsNil)
}
func (ctxSuite) TestRunSuccessfulFailure(c *check.C) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
cmd := exec.Command("not/something/you/can/run")
err := osutil.RunWithContext(ctx, cmd)
c.Check(err, check.ErrorMatches, `fork/exec \S+: no such file or directory`)
}
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