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Merged
merged 6 commits into from
Jun 26, 2024
Merged

fix(remount): ensure mountpoint is a file for files #249

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7ecee4a
fix(remount): create parent directory for files
maxbrunet Jun 25, 2024
51ba3ef
Camel case
maxbrunet Jun 25, 2024
dac4d24
Ensure file path exists
maxbrunet Jun 25, 2024
734cefc
RED: update integration tests to reproduce issue
johnstcn Jun 26, 2024
20c0145
take Options.IgnorePaths into account when temp-remounting
johnstcn Jun 26, 2024
60a700d
Only ignore LayerCacheDir if non-empty
maxbrunet Jun 26, 2024
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15 changes: 15 additions & 0 deletions internal/ebutil/mock_mounter_test.go
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18 changes: 17 additions & 1 deletion internal/ebutil/remount.go
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Original file line number Diff line number Diff line change
Expand Up @@ -88,7 +88,17 @@ outer:
}

func remount(m mounter, src, dest string) error {
if err := m.MkdirAll(dest, 0o750); err != nil {
stat, err := m.Stat(src)
if err != nil {
return fmt.Errorf("stat %s: %w", src, err)
}
var dest_dir string
if stat.IsDir() {
dest_dir = dest
} else {
dest_dir = filepath.Dir(dest)
}
if err := m.MkdirAll(dest_dir, 0o750); err != nil {
return fmt.Errorf("ensure path: %w", err)
}
if err := m.Mount(src, dest, "bind", syscall.MS_BIND, ""); err != nil {
Expand All @@ -110,6 +120,8 @@ type mounter interface {
Mount(string, string, string, uintptr, string) error
// Unmount wraps syscall.Unmount
Unmount(string, int) error
// Stat wraps os.Stat
Stat(string) (os.FileInfo, error)
}

// realMounter implements mounter and actually does the thing.
Expand All @@ -132,3 +144,7 @@ func (m *realMounter) GetMounts() ([]*procfs.MountInfo, error) {
func (m *realMounter) MkdirAll(path string, perm os.FileMode) error {
return os.MkdirAll(path, perm)
}

func (m *realMounter) Stat(path string) (os.FileInfo, error) {
return os.Stat(path)
}
50 changes: 50 additions & 0 deletions internal/ebutil/remount_internal_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import (
"strings"
"syscall"
"testing"
time "time"

"github.com/coder/envbuilder/internal/notcodersdk"
"github.com/stretchr/testify/assert"
Expand All @@ -25,9 +26,11 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/var/lib/modules", "/.test/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/var/lib/modules", 0).Times(1).Return(nil)
mm.EXPECT().Stat("/.test/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/.test/var/lib/modules", "/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/.test/var/lib/modules", 0).Times(1).Return(nil)
Expand All @@ -40,6 +43,31 @@ func Test_tempRemount(t *testing.T) {
_ = remount()
})

t.Run("OKFile", func(t *testing.T) {
t.Parallel()

ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
mounts := fakeMounts("/home", "/usr/bin/utility:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/usr/bin/utility").Return(&fakeFileInfo{isDir: false}, nil)
mm.EXPECT().MkdirAll("/.test/usr/bin", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/usr/bin/utility", "/.test/usr/bin/utility", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/usr/bin/utility", 0).Times(1).Return(nil)
mm.EXPECT().Stat("/.test/usr/bin/utility").Return(&fakeFileInfo{isDir: false}, nil)
mm.EXPECT().MkdirAll("/usr/bin", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/.test/usr/bin/utility", "/usr/bin/utility", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/.test/usr/bin/utility", 0).Times(1).Return(nil)

remount, err := tempRemount(mm, fakeLog(t), "/.test")
require.NoError(t, err)
err = remount()
require.NoError(t, err)
// sync.Once should handle multiple remount calls
_ = remount()
})

t.Run("IgnorePrefixes", func(t *testing.T) {
t.Parallel()

Expand Down Expand Up @@ -75,6 +103,7 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(assert.AnError)

remount, err := tempRemount(mm, fakeLog(t), "/.test")
Expand All @@ -91,6 +120,7 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/var/lib/modules", "/.test/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(assert.AnError)

Expand All @@ -108,6 +138,7 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/var/lib/modules", "/.test/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/var/lib/modules", 0).Times(1).Return(assert.AnError)
Expand All @@ -126,9 +157,11 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/var/lib/modules", "/.test/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/var/lib/modules", 0).Times(1).Return(nil)
mm.EXPECT().Stat("/.test/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/var/lib/modules", os.FileMode(0o750)).Times(1).Return(assert.AnError)

remount, err := tempRemount(mm, fakeLog(t), "/.test")
Expand All @@ -145,9 +178,11 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/var/lib/modules", "/.test/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/var/lib/modules", 0).Times(1).Return(nil)
mm.EXPECT().Stat("/.test/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/.test/var/lib/modules", "/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(assert.AnError)

Expand All @@ -165,9 +200,11 @@ func Test_tempRemount(t *testing.T) {
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")

mm.EXPECT().GetMounts().Return(mounts, nil)
mm.EXPECT().Stat("/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/.test/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/var/lib/modules", "/.test/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/var/lib/modules", 0).Times(1).Return(nil)
mm.EXPECT().Stat("/.test/var/lib/modules").Return(&fakeFileInfo{isDir: true}, nil)
mm.EXPECT().MkdirAll("/var/lib/modules", os.FileMode(0o750)).Times(1).Return(nil)
mm.EXPECT().Mount("/.test/var/lib/modules", "/var/lib/modules", "bind", uintptr(syscall.MS_BIND), "").Times(1).Return(nil)
mm.EXPECT().Unmount("/.test/var/lib/modules", 0).Times(1).Return(assert.AnError)
Expand Down Expand Up @@ -200,3 +237,16 @@ func fakeLog(t *testing.T) func(notcodersdk.LogLevel, string, ...any) {
t.Logf(s, a...)
}
}

type fakeFileInfo struct {
isDir bool
}

func (fi *fakeFileInfo) Name() string { return "" }
func (fi *fakeFileInfo) Size() int64 { return 0 }
func (fi *fakeFileInfo) Mode() os.FileMode { return 0 }
func (fi *fakeFileInfo) ModTime() time.Time { return time.Time{} }
func (fi *fakeFileInfo) IsDir() bool { return fi.isDir }
func (fi *fakeFileInfo) Sys() any { return nil }

var _ os.FileInfo = &fakeFileInfo{}