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Add --last flag to snapshots command

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Add --last flag to snapshots command to only show the last entry for any
(hostname, paths) combination.

This makes it easier to check when various paths were last backed up.
This commit is contained in:
Konrad Wojas 2017-10-26 14:02:29 +08:00
parent 359b273649
commit c5da90a5b7
1 changed files with 44 additions and 0 deletions
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44
cmd/restic/cmd_snapshots.go
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@ -6,6 +6,7 @@ import (
"fmt"
"io"
"sort"
"strings"
"github.com/restic/restic/internal/restic"
"github.com/spf13/cobra"
@ -29,6 +30,7 @@ type SnapshotOptions struct {
Tags restic.TagLists
Paths []string
Compact bool
Last bool
}
var snapshotOptions SnapshotOptions
@ -41,6 +43,7 @@ func init() {
f.Var(&snapshotOptions.Tags, "tag", "only consider snapshots which include this `taglist` (can be specified multiple times)")
f.StringArrayVar(&snapshotOptions.Paths, "path", nil, "only consider snapshots for this `path` (can be specified multiple times)")
f.BoolVarP(&snapshotOptions.Compact, "compact", "c", false, "use compact format")
f.BoolVar(&snapshotOptions.Last, "last", false, "only show the last snapshot for each host and path")
}
func runSnapshots(opts SnapshotOptions, gopts GlobalOptions, args []string) error {
@ -64,6 +67,11 @@ func runSnapshots(opts SnapshotOptions, gopts GlobalOptions, args []string) erro
for sn := range FindFilteredSnapshots(ctx, repo, opts.Host, opts.Tags, opts.Paths, args) {
list = append(list, sn)
}
if opts.Last {
list = FilterLastSnapshots(list)
}
sort.Sort(sort.Reverse(list))
if gopts.JSON {
@ -78,6 +86,42 @@ func runSnapshots(opts SnapshotOptions, gopts GlobalOptions, args []string) erro
return nil
}
// filterLastSnapshotsKey is used by FilterLastSnapshots.
type filterLastSnapshotsKey struct {
Hostname string
JoinedPaths string
}
// newFilterLastSnapshotsKey initializes a filterLastSnapshotsKey from a Snapshot
func newFilterLastSnapshotsKey(sn *restic.Snapshot) filterLastSnapshotsKey {
// Shallow slice copy
var paths = make([]string, len(sn.Paths))
copy(paths, sn.Paths)
sort.Strings(paths)
return filterLastSnapshotsKey{sn.Hostname, strings.Join(paths, "|")}
}
// FilterLastSnapshots filters a list of snapshots to only return the last
// entry for each hostname and path. If the snapshot contains multiple paths,
// they will be joined and treated as one item.
func FilterLastSnapshots(list restic.Snapshots) restic.Snapshots {
// Sort the snapshots so that the newer ones are listed first
sort.SliceStable(list, func(i, j int) bool {
return list[i].Time.After(list[j].Time)
})
var results restic.Snapshots
seen := make(map[filterLastSnapshotsKey]bool)
for _, sn := range list {
key := newFilterLastSnapshotsKey(sn)
if !seen[key] {
seen[key] = true
results = append(results, sn)
}
}
return results
}
// PrintSnapshots prints a text table of the snapshots in list to stdout.
func PrintSnapshots(stdout io.Writer, list restic.Snapshots, compact bool) {