forked from containers/build
/
chroot.go
90 lines (84 loc) · 2.3 KB
/
chroot.go
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// Copyright 2016 The appc 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 chroot
import (
"os"
"os/exec"
"path/filepath"
"github.com/appc/acbuild/engine"
"github.com/appc/spec/schema/types"
"github.com/coreos/rkt/pkg/fileutil"
"github.com/coreos/rkt/pkg/multicall"
"github.com/coreos/rkt/pkg/user"
)
type Engine struct{}
func init() {
multicall.Add("acbuild-chroot", cmdACBuildChroot.Execute)
}
func (e Engine) Run(command string, args []string, environment types.Environment, chroot, workingDir string) error {
resolvConfFile := filepath.Join(chroot, "/etc/resolv.conf")
_, err := os.Stat(resolvConfFile)
switch {
case os.IsNotExist(err):
err := os.MkdirAll(filepath.Dir(resolvConfFile), 0755)
if err != nil {
return err
}
err = fileutil.CopyTree("/etc/resolv.conf", resolvConfFile, user.NewBlankUidRange())
if err != nil {
return err
}
defer os.RemoveAll(resolvConfFile)
case err != nil:
return err
}
var serializedArgs string
for _, arg := range args {
if serializedArgs != "" {
serializedArgs += ","
}
serializedArgs += arg
}
var serializedEnv string
for _, envvar := range environment {
if serializedEnv != "" {
serializedEnv += ","
}
serializedEnv += envvar.Name + "=" + envvar.Value
}
path := "PATH="
for _, p := range engine.Pathlist {
if path != "PATH=" {
path += ":"
}
path += p
}
chrootArgs := []string{
"--cmd", command,
"--chroot", chroot,
"--working-dir", workingDir,
}
if len(serializedArgs) > 0 {
chrootArgs = append(chrootArgs, "--args", serializedArgs)
}
if len(serializedEnv) > 0 {
chrootArgs = append(chrootArgs, "--env", serializedEnv)
}
cmd := exec.Command("acbuild-chroot", chrootArgs...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Env = []string{path}
return cmd.Run()
}