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backup: add --dry-run/-n flag to show what would happen.

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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
This commit is contained in:
Ryan Hitchman
2019-06-12 20:39:13 -07:00
committed by Michael Eischer
parent 533ac4fd95
commit 77bf148460
9 changed files with 405 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
internal/ui/backup.go
View File

@@ -35,6 +35,7 @@ type Backup struct {
start time.Time
totalBytes uint64
dry bool // true if writes are faked
totalCh chan counter
processedCh chan counter
@@ -385,7 +386,11 @@ func (b *Backup) Finish(snapshotID restic.ID) {
b.P("Dirs: %5d new, %5d changed, %5d unmodified\n", b.summary.Dirs.New, b.summary.Dirs.Changed, b.summary.Dirs.Unchanged)
b.V("Data Blobs: %5d new\n", b.summary.ItemStats.DataBlobs)
b.V("Tree Blobs: %5d new\n", b.summary.ItemStats.TreeBlobs)
b.P("Added to the repo: %-5s\n", formatBytes(b.summary.ItemStats.DataSize+b.summary.ItemStats.TreeSize))
verb := "Added"
if b.dry {
verb = "Would add"
}
b.P("%s to the repo: %-5s\n", verb, formatBytes(b.summary.ItemStats.DataSize+b.summary.ItemStats.TreeSize))
b.P("\n")
b.P("processed %v files, %v in %s",
b.summary.Files.New+b.summary.Files.Changed+b.summary.Files.Unchanged,
@@ -399,3 +404,7 @@ func (b *Backup) Finish(snapshotID restic.ID) {
func (b *Backup) SetMinUpdatePause(d time.Duration) {
b.MinUpdatePause = d
}
func (b *Backup) SetDryRun() {
b.dry = true
}

8
internal/ui/json/backup.go
View File

@@ -34,6 +34,7 @@ type Backup struct {
term *termstatus.Terminal
v uint
start time.Time
dry bool
totalBytes uint64
@@ -403,6 +404,7 @@ func (b *Backup) Finish(snapshotID restic.ID) {
TotalBytesProcessed: b.summary.ProcessedBytes,
TotalDuration: time.Since(b.start).Seconds(),
SnapshotID: snapshotID.Str(),
DryRun: b.dry,
})
}
@@ -412,6 +414,11 @@ func (b *Backup) SetMinUpdatePause(d time.Duration) {
b.MinUpdatePause = d
}
// SetDryRun marks the backup as a "dry run".
func (b *Backup) SetDryRun() {
b.dry = true
}
type statusUpdate struct {
MessageType string `json:"message_type"` // "status"
SecondsElapsed uint64 `json:"seconds_elapsed,omitempty"`
@@ -457,4 +464,5 @@ type summaryOutput struct {
TotalBytesProcessed uint64 `json:"total_bytes_processed"`
TotalDuration float64 `json:"total_duration"` // in seconds
SnapshotID string `json:"snapshot_id"`
DryRun bool `json:"dry_run,omitempty"`
}