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component/snapshots: Create new component

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This commit creates a new 'snapshots' component that is intended to
manage snapshots and backups.
This commit is contained in:
Tom Wiesing 2022-10-01 19:39:41 +02:00
parent ea56ff4aac
commit f58920baf4
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7 changed files with 89 additions and 63 deletions
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54
internal/wisski/snapshot.go
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@ -15,65 +15,11 @@ import (
"github.com/FAU-CDI/wisski-distillery/pkg/fsx"
"github.com/FAU-CDI/wisski-distillery/pkg/logging"
"github.com/FAU-CDI/wisski-distillery/pkg/opgroup"
"github.com/FAU-CDI/wisski-distillery/pkg/password"
"github.com/tkw1536/goprogram/status"
"github.com/tkw1536/goprogram/stream"
"golang.org/x/exp/slices"
)
// SnapshotsDir returns the path that contains all snapshot related data.
func (dis *Distillery) SnapshotsDir() string {
return filepath.Join(dis.Config.DeployRoot, "snapshots")
}
// SnapshotsStagingPath returns the path to the directory containing a temporary staging area for snapshots.
// Use NewSnapshotStagingDir to generate a new staging area.
func (dis *Distillery) SnapshotsStagingPath() string {
return filepath.Join(dis.SnapshotsDir(), "staging")
}
// SnapshotsArchivePath returns the path to the directory containing all exported archives.
// Use NewSnapshotArchivePath to generate a path to a new archive in this directory.
func (dis *Distillery) SnapshotsArchivePath() string {
return filepath.Join(dis.SnapshotsDir(), "archives")
}
// NewSnapshotArchivePath returns the path to a new archive with the provided prefix.
// The path is guaranteed to not exist.
func (dis *Distillery) NewSnapshotArchivePath(prefix string) (path string) {
// TODO: Consider moving these into a subdirectory with the provided prefix.
for path == "" || fsx.Exists(dis.Environment, path) {
name := dis.newSnapshotName(prefix) + ".tar.gz"
path = filepath.Join(dis.SnapshotsArchivePath(), name)
}
return
}
// newSnapshot name returns a new basename for a snapshot with the provided prefix.
// The name is guaranteed to be unique within this process.
func (*Distillery) newSnapshotName(prefix string) string {
suffix, _ := password.Password(64) // silently ignore any errors!
if prefix == "" {
prefix = "backup"
} else {
prefix = "snapshot-" + prefix
}
return fmt.Sprintf("%s-%d-%s", prefix, time.Now().Unix(), suffix)
}
// NewSnapshotStagingDir returns the path to a new snapshot directory.
// The directory is guaranteed to have been freshly created.
func (dis *Distillery) NewSnapshotStagingDir(prefix string) (path string, err error) {
for path == "" || environment.IsExist(err) {
path = filepath.Join(dis.SnapshotsStagingPath(), dis.newSnapshotName(prefix))
err = dis.Core.Environment.Mkdir(path, environment.DefaultFilePerm)
}
if err != nil {
path = ""
}
return
}
// SnapshotDescription is a description for a snapshot
type SnapshotDescription struct {
Dest string // destination path