16e46c8afd
This change adds a new --rootfs=path option to kubeadm, and (if
provided) chroot()s to this path before performing file operations.
This makes it possible to run the kubeadm binary from a container, but
perform remaining file operations against the host filesystem using
something like:
docker run -v /:/rootfs --net=host --uts=host --pid=host \
kubeadm:latest init --rootfs /rootfs...
Fixes kubernetes/kubeadm#503
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// +build !windows
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"testing"
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)
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// Can't just call Chroot() because it will affect other tests in the
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// same process. Golang makes it hard to just call fork(), so instead
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// we exec ourselves again, and run the test in the new subprocess.
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func testChrootReal(t *testing.T) {
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testfile := filepath.FromSlash("/" + filepath.Base(os.Args[0]))
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dir := filepath.Dir(os.Args[0])
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if dir == "." {
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t.Skip("skipping: running test at root somehow")
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}
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if err := Chroot(dir); err != nil {
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if strings.Contains(err.Error(), "operation not permitted") {
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t.Skip("skipping: insufficient permissions to chroot")
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}
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t.Fatalf("chroot error: %v", err)
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}
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// All file access should now be relative to `dir`
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if _, err := os.Stat(testfile); err != nil {
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t.Errorf("Expected file %q to exist, but got %v", testfile, err)
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}
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}
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func TestChroot(t *testing.T) {
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if os.Getenv("GO_TEST_CHROOT_FOR_REALZ") == "1" {
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testChrootReal(t)
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return
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}
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cmd := exec.Command(os.Args[0], "-test.v", "-test.run=TestChroot")
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cmd.Env = []string{"GO_TEST_CHROOT_FOR_REALZ=1"}
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out, err := cmd.Output()
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t.Logf("subprocess output:\n%s", out)
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if err != nil {
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t.Errorf("subprocess error: %v", err)
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}
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}
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