mirror of
https://github.com/zrepl/zrepl.git
synced 2024-12-12 02:02:16 +01:00
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package cmd
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import (
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"context"
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"fmt"
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"github.com/zrepl/zrepl/zfs"
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"time"
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)
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type Pruner struct {
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Now time.Time
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DryRun bool
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DatasetFilter zfs.DatasetFilter
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SnapshotPrefix string
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PrunePolicy PrunePolicy
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}
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type PruneResult struct {
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Filesystem *zfs.DatasetPath
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All []zfs.FilesystemVersion
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Keep []zfs.FilesystemVersion
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Remove []zfs.FilesystemVersion
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}
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func (p *Pruner) Run(ctx context.Context) (r []PruneResult, err error) {
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log := ctx.Value(contextKeyLog).(Logger)
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if p.DryRun {
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log.Info("doing dry run")
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}
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filesystems, err := zfs.ZFSListMapping(p.DatasetFilter)
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if err != nil {
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log.WithError(err).Error("error applying filesystem filter")
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return nil, err
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}
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if len(filesystems) <= 0 {
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log.Info("no filesystems matching filter")
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return nil, err
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}
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r = make([]PruneResult, 0, len(filesystems))
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for _, fs := range filesystems {
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log := log.WithField(logFSField, fs.ToString())
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// only prune snapshots, bookmarks are kept forever
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snapshotFilter := NewTypedPrefixFilter(p.SnapshotPrefix, zfs.Snapshot)
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fsversions, err := zfs.ZFSListFilesystemVersions(fs, snapshotFilter)
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if err != nil {
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log.WithError(err).Error("error listing filesytem versions")
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continue
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}
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if len(fsversions) == 0 {
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log.WithField("prefix", p.SnapshotPrefix).Info("no filesystem versions matching prefix")
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continue
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}
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keep, remove, err := p.PrunePolicy.Prune(fs, fsversions)
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if err != nil {
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log.WithError(err).Error("error evaluating prune policy")
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continue
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}
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log.WithField("fsversions", fsversions).
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WithField("keep", keep).
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WithField("remove", remove).
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Debug("prune policy debug dump")
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r = append(r, PruneResult{fs, fsversions, keep, remove})
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makeFields := func(v zfs.FilesystemVersion) (fields map[string]interface{}) {
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fields = make(map[string]interface{})
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fields["version"] = v.ToAbsPath(fs)
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timeSince := v.Creation.Sub(p.Now)
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fields["age_ns"] = timeSince
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const day time.Duration = 24 * time.Hour
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days := timeSince / day
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remainder := timeSince % day
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fields["age_str"] = fmt.Sprintf("%dd%s", days, remainder)
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return
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}
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for _, v := range remove {
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fields := makeFields(v)
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log.WithFields(fields).Info("destroying version")
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// echo what we'll do and exec zfs destroy if not dry run
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// TODO special handling for EBUSY (zfs hold)
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// TODO error handling for clones? just echo to cli, skip over, and exit with non-zero status code (we're idempotent)
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if !p.DryRun {
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err := zfs.ZFSDestroyFilesystemVersion(fs, v)
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if err != nil {
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// handle
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log.WithFields(fields).WithError(err).Error("error destroying version")
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}
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}
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}
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}
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return
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}
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