Ophestra
afe23600d2
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This allows path and mount functions to be instrumented. Signed-off-by: Ophestra <cat@gensokyo.uk>
253 lines
7.7 KiB
Go
253 lines
7.7 KiB
Go
package container
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import (
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"errors"
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"fmt"
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"io"
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"math"
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"os"
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"path"
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"reflect"
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"syscall"
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"testing"
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"unsafe"
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"hakurei.app/container/vfs"
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)
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func TestToSysroot(t *testing.T) {
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testCases := []struct {
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name string
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want string
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}{
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{"", "/sysroot"},
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{"/", "/sysroot"},
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{"//etc///", "/sysroot/etc"},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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if got := toSysroot(tc.name); got != tc.want {
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t.Errorf("toSysroot: %q, want %q", got, tc.want)
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}
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})
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}
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}
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func TestToHost(t *testing.T) {
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testCases := []struct {
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name string
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want string
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}{
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{"", "/host"},
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{"/", "/host"},
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{"//etc///", "/host/etc"},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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if got := toHost(tc.name); got != tc.want {
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t.Errorf("toHost: %q, want %q", got, tc.want)
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}
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})
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}
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}
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// InternalToHostOvlEscape exports toHost passed to EscapeOverlayDataSegment.
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func InternalToHostOvlEscape(s string) string { return EscapeOverlayDataSegment(toHost(s)) }
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func TestCreateFile(t *testing.T) {
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t.Run("nonexistent", func(t *testing.T) {
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if err := createFile(path.Join(Nonexistent, ":3"), 0644, 0755, nil); !errors.Is(err, wrapErrSelf(&os.PathError{
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Op: "mkdir",
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Path: "/proc/nonexistent",
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Err: syscall.ENOENT,
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})) {
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t.Errorf("createFile: error = %v", err)
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}
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if err := createFile(path.Join(Nonexistent), 0644, 0755, nil); !errors.Is(err, wrapErrSelf(&os.PathError{
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Op: "open",
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Path: "/proc/nonexistent",
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Err: syscall.ENOENT,
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})) {
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t.Errorf("createFile: error = %v", err)
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}
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})
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t.Run("touch", func(t *testing.T) {
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tempDir := t.TempDir()
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pathname := path.Join(tempDir, "empty")
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if err := createFile(pathname, 0644, 0755, nil); err != nil {
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t.Fatalf("createFile: error = %v", err)
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}
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if d, err := os.ReadFile(pathname); err != nil {
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t.Fatalf("ReadFile: error = %v", err)
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} else if len(d) != 0 {
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t.Fatalf("createFile: %q", string(d))
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}
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})
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t.Run("write", func(t *testing.T) {
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tempDir := t.TempDir()
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pathname := path.Join(tempDir, "zero")
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if err := createFile(pathname, 0644, 0755, []byte{0}); err != nil {
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t.Fatalf("createFile: error = %v", err)
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}
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if d, err := os.ReadFile(pathname); err != nil {
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t.Fatalf("ReadFile: error = %v", err)
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} else if string(d) != "\x00" {
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t.Fatalf("createFile: %q, want %q", string(d), "\x00")
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}
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})
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}
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func TestEnsureFile(t *testing.T) {
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t.Run("create", func(t *testing.T) {
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if err := ensureFile(path.Join(t.TempDir(), "ensure"), 0644, 0755); err != nil {
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t.Errorf("ensureFile: error = %v", err)
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}
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})
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t.Run("stat", func(t *testing.T) {
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t.Run("inaccessible", func(t *testing.T) {
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tempDir := t.TempDir()
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pathname := path.Join(tempDir, "inaccessible")
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if f, err := os.Create(pathname); err != nil {
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t.Fatalf("Create: error = %v", err)
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} else {
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_ = f.Close()
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}
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if err := os.Chmod(tempDir, 0); err != nil {
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t.Fatalf("Chmod: error = %v", err)
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}
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wantErr := wrapErrSelf(&os.PathError{
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Op: "stat",
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Path: pathname,
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Err: syscall.EACCES,
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})
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if err := ensureFile(pathname, 0644, 0755); !errors.Is(err, wantErr) {
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t.Errorf("ensureFile: error = %v, want %v", err, wantErr)
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}
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if err := os.Chmod(tempDir, 0755); err != nil {
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t.Fatalf("Chmod: error = %v", err)
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}
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})
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t.Run("directory", func(t *testing.T) {
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pathname := t.TempDir()
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wantErr := msg.WrapErr(syscall.EISDIR, fmt.Sprintf("path %q is a directory", pathname))
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if err := ensureFile(pathname, 0644, 0755); !errors.Is(err, wantErr) {
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t.Errorf("ensureFile: error = %v, want %v", err, wantErr)
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}
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})
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t.Run("ensure", func(t *testing.T) {
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tempDir := t.TempDir()
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pathname := path.Join(tempDir, "ensure")
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if f, err := os.Create(pathname); err != nil {
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t.Fatalf("Create: error = %v", err)
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} else {
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_ = f.Close()
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}
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if err := ensureFile(pathname, 0644, 0755); err != nil {
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t.Errorf("ensureFile: error = %v", err)
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}
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})
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})
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}
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func TestProcPaths(t *testing.T) {
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t.Run("host", func(t *testing.T) {
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t.Run("stdout", func(t *testing.T) {
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want := "/host/proc/self/fd/1"
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if got := hostProc.stdout(); got != want {
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t.Errorf("stdout: %q, want %q", got, want)
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}
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})
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t.Run("fd", func(t *testing.T) {
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want := "/host/proc/self/fd/9223372036854775807"
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if got := hostProc.fd(math.MaxInt64); got != want {
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t.Errorf("stdout: %q, want %q", got, want)
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}
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})
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})
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t.Run("mountinfo", func(t *testing.T) {
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t.Run("nonexistent", func(t *testing.T) {
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nonexistentProc := newProcPaths(direct{}, t.TempDir())
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wantErr := wrapErrSelf(&os.PathError{
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Op: "open",
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Path: nonexistentProc.self + "/mountinfo",
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Err: syscall.ENOENT,
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})
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if err := nonexistentProc.mountinfo(func(*vfs.MountInfoDecoder) error { return syscall.EINVAL }); !errors.Is(err, wantErr) {
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t.Errorf("mountinfo: error = %v, want %v", err, wantErr)
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}
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})
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t.Run("sample", func(t *testing.T) {
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tempDir := t.TempDir()
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if err := os.MkdirAll(path.Join(tempDir, "proc/self"), 0755); err != nil {
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t.Fatalf("MkdirAll: error = %v", err)
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}
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t.Run("clean", func(t *testing.T) {
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if err := os.WriteFile(path.Join(tempDir, "proc/self/mountinfo"), []byte(`15 20 0:3 / /proc rw,relatime - proc /proc rw
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16 20 0:15 / /sys rw,relatime - sysfs /sys rw
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17 20 0:5 / /dev rw,relatime - devtmpfs udev rw,size=1983516k,nr_inodes=495879,mode=755`), 0644); err != nil {
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t.Fatalf("WriteFile: error = %v", err)
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}
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var mountInfo *vfs.MountInfo
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if err := newProcPaths(direct{}, tempDir).mountinfo(func(d *vfs.MountInfoDecoder) error { return d.Decode(&mountInfo) }); err != nil {
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t.Fatalf("mountinfo: error = %v", err)
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}
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wantMountInfo := &vfs.MountInfo{Next: &vfs.MountInfo{Next: &vfs.MountInfo{
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MountInfoEntry: vfs.MountInfoEntry{ID: 17, Parent: 20, Devno: vfs.DevT{0, 5}, Root: "/", Target: "/dev", VfsOptstr: "rw,relatime", OptFields: []string{}, FsType: "devtmpfs", Source: "udev", FsOptstr: "rw,size=1983516k,nr_inodes=495879,mode=755"}},
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MountInfoEntry: vfs.MountInfoEntry{ID: 16, Parent: 20, Devno: vfs.DevT{0, 15}, Root: "/", Target: "/sys", VfsOptstr: "rw,relatime", OptFields: []string{}, FsType: "sysfs", Source: "/sys", FsOptstr: "rw"}},
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MountInfoEntry: vfs.MountInfoEntry{ID: 15, Parent: 20, Devno: vfs.DevT{0, 3}, Root: "/", Target: "/proc", VfsOptstr: "rw,relatime", OptFields: []string{}, FsType: "proc", Source: "/proc", FsOptstr: "rw"},
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}
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if !reflect.DeepEqual(mountInfo, wantMountInfo) {
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t.Errorf("Decode: %#v, want %#v", mountInfo, wantMountInfo)
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}
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})
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t.Run("closed", func(t *testing.T) {
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p := newProcPaths(direct{}, tempDir)
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wantErr := wrapErrSelf(&os.PathError{
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Op: "close",
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Path: p.self + "/mountinfo",
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Err: os.ErrClosed,
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})
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if err := p.mountinfo(func(d *vfs.MountInfoDecoder) error {
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v := reflect.ValueOf(d).Elem().FieldByName("s").Elem().FieldByName("r")
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v = reflect.NewAt(v.Type(), unsafe.Pointer(v.UnsafeAddr()))
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if f, ok := v.Elem().Interface().(io.ReadCloser); !ok {
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t.Fatal("implementation of bufio.Scanner no longer compatible with this fault injection")
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return syscall.ENOTRECOVERABLE
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} else {
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return f.Close()
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}
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}); !errors.Is(err, wantErr) {
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t.Errorf("mountinfo: error = %v, want %v", err, wantErr)
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}
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})
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t.Run("malformed", func(t *testing.T) {
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path.Join(tempDir, "proc/self/mountinfo")
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if err := os.WriteFile(path.Join(tempDir, "proc/self/mountinfo"), []byte{0}, 0644); err != nil {
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t.Fatalf("WriteFile: error = %v", err)
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}
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wantErr := wrapErrSuffix(vfs.ErrMountInfoFields, "cannot parse mountinfo:")
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if err := newProcPaths(direct{}, tempDir).mountinfo(func(d *vfs.MountInfoDecoder) error { return d.Decode(new(*vfs.MountInfo)) }); !errors.Is(err, wantErr) {
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t.Fatalf("mountinfo: error = %v, want %v", err, wantErr)
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}
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})
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})
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})
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}
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