mirror of
https://github.com/zrepl/zrepl.git
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297 lines
7.3 KiB
Go
297 lines
7.3 KiB
Go
package zfs
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import (
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"bytes"
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"context"
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"strings"
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"syscall"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/zrepl/zrepl/util/chainlock"
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)
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type mockBatchDestroy struct {
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mtx chainlock.L
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calls []string
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commaUnsupported bool
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undestroyable *regexp.Regexp
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randomerror string
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e2biglen int
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}
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func (m *mockBatchDestroy) DestroySnapshotsCommaSyntaxSupported(_ context.Context) (bool, error) {
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return !m.commaUnsupported, nil
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}
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func (m *mockBatchDestroy) Destroy(ctx context.Context, args []string) error {
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defer m.mtx.Lock().Unlock()
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if len(args) != 1 {
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panic("unexpected use of Destroy")
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}
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a := args[0]
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if m.e2biglen > 0 && len(a) > m.e2biglen {
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return &os.PathError{Err: syscall.E2BIG} // TestExcessiveArgumentsResultInE2BIG checks that this errors is produced
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}
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m.calls = append(m.calls, a)
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var snapnames []string
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if m.commaUnsupported {
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snapnames = append(snapnames, a)
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if strings.Contains(a, ",") {
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return fmt.Errorf("unsupported syntax mock error")
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}
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} else {
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snapnames = append(snapnames, strings.Split(a, ",")...)
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}
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fs, vt, firstsnapname, err := DecomposeVersionString(snapnames[0])
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if err != nil {
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panic(err)
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}
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if vt != Snapshot {
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panic(vt)
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}
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snapnames[0] = firstsnapname
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var undestroyable []string
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if m.undestroyable != nil {
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for _, snap := range snapnames {
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if m.undestroyable.MatchString(snap) {
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undestroyable = append(undestroyable, snap)
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}
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}
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}
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if len(undestroyable) > 0 {
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return &DestroySnapshotsError{
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Filesystem: fs,
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Undestroyable: undestroyable,
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Reason: []string{"undestroyable mock with regexp " + m.undestroyable.String()},
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}
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}
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if m.randomerror != "" && strings.Contains(a, m.randomerror) {
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return fmt.Errorf("randomerror")
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}
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return nil
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}
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func TestBatchDestroySnaps(t *testing.T) {
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errs := make([]error, 10)
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nilErrs := func() {
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for i := range errs {
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errs[i] = nil
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}
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}
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opsTemplate := []*DestroySnapOp{
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&DestroySnapOp{"zroot/z", "foo", &errs[0]},
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&DestroySnapOp{"zroot/a", "foo", &errs[1]},
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&DestroySnapOp{"zroot/a", "bar", &errs[2]},
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&DestroySnapOp{"zroot/b", "bar", &errs[3]},
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&DestroySnapOp{"zroot/b", "zab", &errs[4]},
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&DestroySnapOp{"zroot/b", "undestroyable", &errs[5]},
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&DestroySnapOp{"zroot/c", "baz", &errs[6]},
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&DestroySnapOp{"zroot/c", "randomerror", &errs[7]},
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&DestroySnapOp{"zroot/c", "bar", &errs[8]},
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&DestroySnapOp{"zroot/d", "blup", &errs[9]},
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}
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t.Run("single_undestroyable_dataset", func(t *testing.T) {
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nilErrs()
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mock := &mockBatchDestroy{
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commaUnsupported: false,
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undestroyable: regexp.MustCompile(`undestroyable`),
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randomerror: "randomerror",
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}
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doDestroy(context.TODO(), opsTemplate, mock)
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assert.NoError(t, errs[0])
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assert.NoError(t, errs[1])
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assert.NoError(t, errs[2])
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assert.NoError(t, errs[3])
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assert.NoError(t, errs[4])
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assert.Error(t, errs[5], "undestroyable")
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assert.NoError(t, errs[6])
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assert.Error(t, errs[7], "randomerror")
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assert.NoError(t, errs[8])
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assert.NoError(t, errs[9])
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defer mock.mtx.Lock().Unlock()
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assert.Equal(
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t,
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[]string{
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"zroot/a@bar,foo", // reordered snaps in lexicographical order
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"zroot/b@bar,undestroyable,zab",
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"zroot/b@bar,zab", // eliminate undestroyables, try others again
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"zroot/b@undestroyable",
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"zroot/c@bar,baz,randomerror",
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"zroot/c@bar", // fallback to single-snapshot on non DestroyError
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"zroot/c@baz",
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"zroot/c@randomerror",
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"zroot/d@blup",
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"zroot/z@foo", // ordered at last position
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},
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mock.calls,
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)
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})
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t.Run("all_undestroyable", func(t *testing.T) {
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opsTemplate := []*DestroySnapOp{
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&DestroySnapOp{"zroot/a", "foo", new(error)},
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&DestroySnapOp{"zroot/a", "bar", new(error)},
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}
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mock := &mockBatchDestroy{
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commaUnsupported: false,
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undestroyable: regexp.MustCompile(`.*`),
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}
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doDestroy(context.TODO(), opsTemplate, mock)
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defer mock.mtx.Lock().Unlock()
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assert.Equal(
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t,
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[]string{
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"zroot/a@bar,foo", // reordered snaps in lexicographical order
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"zroot/a@bar",
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"zroot/a@foo",
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},
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mock.calls,
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)
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})
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t.Run("comma_syntax_unsupported", func(t *testing.T) {
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nilErrs()
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mock := &mockBatchDestroy{
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commaUnsupported: true,
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undestroyable: regexp.MustCompile(`undestroyable`),
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randomerror: "randomerror",
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}
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doDestroy(context.TODO(), opsTemplate, mock)
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assert.NoError(t, errs[0])
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assert.NoError(t, errs[1])
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assert.NoError(t, errs[2])
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assert.NoError(t, errs[3])
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assert.NoError(t, errs[4])
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assert.Error(t, errs[5], "undestroyable")
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assert.NoError(t, errs[6])
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assert.Error(t, errs[7], "randomerror")
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assert.NoError(t, errs[8])
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assert.NoError(t, errs[9])
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defer mock.mtx.Lock().Unlock()
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assert.Equal(
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t,
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[]string{
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// expect exactly argument order
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"zroot/z@foo",
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"zroot/a@foo",
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"zroot/a@bar",
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"zroot/b@bar",
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"zroot/b@zab",
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"zroot/b@undestroyable",
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"zroot/c@baz",
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"zroot/c@randomerror",
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"zroot/c@bar",
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"zroot/d@blup",
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},
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mock.calls,
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)
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})
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t.Run("empty_ops", func(t *testing.T) {
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mock := &mockBatchDestroy{}
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doDestroy(context.TODO(), nil, mock)
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defer mock.mtx.Lock().Unlock()
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assert.Empty(t, mock.calls)
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})
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t.Run("ops_without_snapnames", func(t *testing.T) {
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mock := &mockBatchDestroy{}
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var err error
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ops := []*DestroySnapOp{&DestroySnapOp{"somefs", "", &err}}
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doDestroy(context.TODO(), ops, mock)
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assert.Error(t, err)
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defer mock.mtx.Lock().Unlock()
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assert.Empty(t, mock.calls)
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})
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t.Run("ops_without_fsnames", func(t *testing.T) {
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mock := &mockBatchDestroy{}
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var err error
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ops := []*DestroySnapOp{&DestroySnapOp{"", "fsname", &err}}
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doDestroy(context.TODO(), ops, mock)
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assert.Error(t, err)
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defer mock.mtx.Lock().Unlock()
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assert.Empty(t, mock.calls)
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})
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t.Run("splits_up_batches_at_e2big", func(t *testing.T) {
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mock := &mockBatchDestroy{
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e2biglen: 10,
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}
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var dummy error
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reqs := []*DestroySnapOp{
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// should fit (1111@a,b,c)
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&DestroySnapOp{"1111", "a", &dummy},
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&DestroySnapOp{"1111", "b", &dummy},
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&DestroySnapOp{"1111", "c", &dummy},
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// should split
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&DestroySnapOp{"2222", "01", &dummy},
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&DestroySnapOp{"2222", "02", &dummy},
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&DestroySnapOp{"2222", "03", &dummy},
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&DestroySnapOp{"2222", "04", &dummy},
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&DestroySnapOp{"2222", "05", &dummy},
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&DestroySnapOp{"2222", "06", &dummy},
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&DestroySnapOp{"2222", "07", &dummy},
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&DestroySnapOp{"2222", "08", &dummy},
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&DestroySnapOp{"2222", "09", &dummy},
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&DestroySnapOp{"2222", "10", &dummy},
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}
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doDestroy(context.TODO(), reqs, mock)
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defer mock.mtx.Lock().Unlock()
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assert.Equal(
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t,
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[]string{
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"1111@a,b,c",
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"2222@01,02",
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"2222@03",
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"2222@04,05",
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"2222@06,07",
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"2222@08",
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"2222@09,10",
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},
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mock.calls,
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)
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})
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}
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func TestExcessiveArgumentsResultInE2BIG(t *testing.T) {
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// FIXME dynamic value
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const maxArgumentLength = 1 << 20 // higher than any OS we know, should always fail
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t.Logf("maxArgumentLength=%v", maxArgumentLength)
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maxArg := bytes.Repeat([]byte("a"), maxArgumentLength)
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cmd := exec.Command("/bin/sh", "-c", "echo -n $1; echo -n $2", "cmdname", string(maxArg), string(maxArg))
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output, err := cmd.CombinedOutput()
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if pe, ok := err.(*os.PathError); ok && pe.Err == syscall.E2BIG {
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t.Logf("ok, system returns E2BIG")
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} else {
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t.Errorf("system did not return E2BIG, but err=%T: %v ", err, err)
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t.Logf("output:\n%s", output)
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}
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}
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