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This can be used to check how large a backup is or validate exclusions. It does not actually write any data to the underlying backend. This is implemented as a simple overlay backend that accepts writes without forwarding them, passes through reads, and generally does the minimal necessary to pretend that progress is actually happening. Fixes #1542 Example usage: $ restic -vv --dry-run . | grep add new /changelog/unreleased/issue-1542, saved in 0.000s (350 B added) modified /cmd/restic/cmd_backup.go, saved in 0.000s (16.543 KiB added) modified /cmd/restic/global.go, saved in 0.000s (0 B added) new /internal/backend/dry/dry_backend_test.go, saved in 0.000s (3.866 KiB added) new /internal/backend/dry/dry_backend.go, saved in 0.000s (3.744 KiB added) modified /internal/backend/test/tests.go, saved in 0.000s (0 B added) modified /internal/repository/repository.go, saved in 0.000s (20.707 KiB added) modified /internal/ui/backup.go, saved in 0.000s (9.110 KiB added) modified /internal/ui/jsonstatus/status.go, saved in 0.001s (11.055 KiB added) modified /restic, saved in 0.131s (25.542 MiB added) Would add to the repo: 25.892 MiB
143 lines
3.8 KiB
Go
143 lines
3.8 KiB
Go
package dryrun_test
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import (
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"context"
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"fmt"
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"io"
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"io/ioutil"
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"sort"
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"strings"
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"testing"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/backend/dryrun"
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"github.com/restic/restic/internal/backend/mem"
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)
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// make sure that Backend implements backend.Backend
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var _ restic.Backend = &dryrun.Backend{}
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func newBackends() (*dryrun.Backend, restic.Backend) {
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m := mem.New()
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return dryrun.New(m), m
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}
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func TestDry(t *testing.T) {
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d, m := newBackends()
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m.Save(context.TODO(), restic.Handle{}, restic.NewByteReader([]byte("foo")))
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ctx := context.TODO()
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// Since the dry backend is a mostly write-only overlay, the standard backend test suite
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// won't pass. Instead, perform a series of operations over the backend, testing the state
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// at each step.
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steps := []struct {
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be restic.Backend
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op string
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fname string
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content string
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wantErr string
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}{
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{d, "loc", "", "DRY:RAM", ""},
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{d, "delete", "", "", "doesn't support"},
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{d, "stat", "a", "", "not found"},
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{d, "list", "", "", ""},
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{d, "save", "", "", "invalid"},
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{d, "test", "a", "", ""},
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{m, "save", "a", "baz", ""},
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{d, "save", "b", "foob", ""},
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{d, "save", "b", "asdf", "already exists"},
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{d, "test", "a", "1", ""},
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{d, "test", "b", "1", ""},
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{d, "stat", "", "", "invalid"},
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{d, "stat", "a", "a 3", ""},
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{d, "stat", "b", "b 4", ""},
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{d, "load", "a", "baz", ""},
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{d, "load", "b", "", "can't read file"},
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{d, "list", "", "a b", ""},
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{d, "remove", "c", "", "not found"},
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{d, "remove", "b", "", ""},
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{d, "stat", "b", "", "not found"},
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{d, "list", "", "a", ""},
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{d, "close", "", "", ""},
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{d, "close", "", "", ""},
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}
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for i, step := range steps {
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var err error
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var boolRes bool
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handle := restic.Handle{Type: restic.DataFile, Name: step.fname}
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switch step.op {
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case "save":
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err = step.be.Save(ctx, handle, restic.NewByteReader([]byte(step.content)))
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case "test":
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boolRes, err = step.be.Test(ctx, handle)
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if boolRes != (step.content != "") {
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t.Errorf("%d. Test(%q) = %v, want %v", i, step.fname, boolRes, step.content != "")
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}
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case "list":
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fileList := []string{}
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err = step.be.List(ctx, restic.DataFile, func(fi restic.FileInfo) error {
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for _, n := range fileList {
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if n == fi.Name {
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return nil
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}
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}
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fileList = append(fileList, fi.Name)
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return nil
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})
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sort.Strings(fileList)
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files := strings.Join(fileList, " ")
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if files != step.content {
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t.Errorf("%d. List = %q, want %q", i, files, step.content)
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}
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case "loc":
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loc := step.be.Location()
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if loc != step.content {
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t.Errorf("%d. Location = %q, want %q", i, loc, step.content)
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}
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case "delete":
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err = step.be.Delete(ctx)
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case "remove":
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err = step.be.Remove(ctx, handle)
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case "stat":
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var fi restic.FileInfo
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fi, err = step.be.Stat(ctx, handle)
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if err == nil {
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fis := fmt.Sprintf("%s %d", fi.Name, fi.Size)
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if fis != step.content {
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t.Errorf("%d. Stat = %q, want %q", i, fis, step.content)
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}
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}
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case "load":
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data := ""
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err = step.be.Load(ctx, handle, 100, 0, func(rd io.Reader) error {
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buf, err := ioutil.ReadAll(rd)
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data = string(buf)
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return err
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})
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if data != step.content {
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t.Errorf("%d. Load = %q, want %q", i, data, step.content)
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}
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case "close":
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err = step.be.Close()
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default:
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t.Fatalf("%d. unknown step operation %q", i, step.op)
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}
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if step.wantErr != "" {
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if err == nil {
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t.Errorf("%d. %s error = nil, want %q", i, step.op, step.wantErr)
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} else if !strings.Contains(err.Error(), step.wantErr) {
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t.Errorf("%d. %s error = %q, doesn't contain %q", i, step.op, err, step.wantErr)
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} else if step.wantErr == "not found" && !step.be.IsNotExist(err) {
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t.Errorf("%d. IsNotExist(%s error) = false, want true", i, step.op)
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}
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} else if err != nil {
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t.Errorf("%d. %s error = %q, want nil", i, step.op, err)
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}
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}
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}
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