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remount_internal_test.go
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package ebutil
import (
"os"
"strings"
"syscall"
"testing"
time "time"
"github.com/coder/envbuilder/internal/notcodersdk"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.uber.org/mock/gomock"
"github.com/prometheus/procfs"
)
func Test_tempRemount(t *testing.T) {
t.Parallel()
t.Run("OK", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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)
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("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().OpenFile("/.test/usr/bin/utility", os.O_CREATE, os.FileMode(0o640)).Times(1).Return(new(os.File), 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().OpenFile("/usr/bin/utility", os.O_CREATE, os.FileMode(0o640)).Times(1).Return(new(os.File), 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()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
mounts := fakeMounts("/home", "/var/lib/modules:ro", "/proc", "/sys")
mm.EXPECT().GetMounts().Return(mounts, nil)
remount, err := tempRemount(mm, fakeLog(t), "/.test", "/var/lib")
require.NoError(t, err)
err = remount()
require.NoError(t, err)
})
t.Run("ErrGetMounts", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
mm.EXPECT().GetMounts().Return(nil, assert.AnError)
remount, err := tempRemount(mm, fakeLog(t), "/.test", "/var/lib")
require.ErrorContains(t, err, assert.AnError.Error())
err = remount()
require.NoError(t, err)
})
t.Run("ErrMkdirAll", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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")
require.ErrorContains(t, err, assert.AnError.Error())
err = remount()
require.NoError(t, err)
})
t.Run("ErrMountBind", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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)
remount, err := tempRemount(mm, fakeLog(t), "/.test")
require.ErrorContains(t, err, assert.AnError.Error())
err = remount()
require.NoError(t, err)
})
t.Run("ErrUnmount", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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)
remount, err := tempRemount(mm, fakeLog(t), "/.test")
require.ErrorContains(t, err, assert.AnError.Error())
err = remount()
require.NoError(t, err)
})
t.Run("ErrRemountMkdirAll", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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")
require.NoError(t, err)
err = remount()
require.ErrorContains(t, err, assert.AnError.Error())
})
t.Run("ErrRemountMountBind", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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)
remount, err := tempRemount(mm, fakeLog(t), "/.test")
require.NoError(t, err)
err = remount()
require.ErrorContains(t, err, assert.AnError.Error())
})
t.Run("ErrRemountUnmount", func(t *testing.T) {
t.Parallel()
ctrl := gomock.NewController(t)
mm := NewMockmounter(ctrl)
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)
remount, err := tempRemount(mm, fakeLog(t), "/.test")
require.NoError(t, err)
err = remount()
require.ErrorContains(t, err, assert.AnError.Error())
})
}
// convenience function for generating a slice of *procfs.MountInfo
func fakeMounts(mounts ...string) []*procfs.MountInfo {
m := make([]*procfs.MountInfo, 0)
for _, s := range mounts {
mp := s
o := make(map[string]string)
if strings.HasSuffix(mp, ":ro") {
mp = strings.TrimSuffix(mp, ":ro")
o["ro"] = "true"
}
m = append(m, &procfs.MountInfo{MountPoint: mp, Options: o})
}
return m
}
func fakeLog(t *testing.T) func(notcodersdk.LogLevel, string, ...any) {
t.Helper()
return func(_ notcodersdk.LogLevel, s string, a ...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{}