Move wisski instance code to separate package

internal/wisski/update.go

@@ -0,0 +1,47 @@
+package wisski
+
+import (
+	"time"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/component/meta"
+	"github.com/FAU-CDI/wisski-distillery/pkg/environment"
+	"github.com/tkw1536/goprogram/exit"
+	"github.com/tkw1536/goprogram/stream"
+)
+
+var errBlindUpdateFailed = exit.Error{
+	Message:  "Failed to run blind update script for instance %q: exited with code %s",
+	ExitCode: exit.ExitGeneric,
+}
+
+// BlinUpdate performs a blind update of the given instance
+func (wisski *WissKI) BlindUpdate(io stream.IOStream) error {
+	code, err := wisski.Shell(io, "/runtime/blind_update.sh")
+	if err != nil {
+		return errBlindUpdateFailed.WithMessageF(wisski.Slug, environment.ExecCommandError)
+	}
+	if code != 0 {
+		return errBlindUpdateFailed.WithMessageF(wisski.Slug, code)
+	}
+
+	return wisski.setLastUpdate()
+}
+
+var lastUpdate = meta.StorageFor[int64]("lastUpdate")
+
+func (wisski *WissKI) LastUpdate() (t time.Time, err error) {
+	epoch, err := lastUpdate(wisski.storage()).Get()
+	if err == meta.ErrMetadatumNotSet {
+		return t, nil
+	}
+	if err != nil {
+		return t, err
+	}
+
+	// and turn it into time!
+	return time.Unix(epoch, 0), nil
+}
+
+func (wisski *WissKI) setLastUpdate() error {
+	return lastUpdate(wisski.storage()).Set(time.Now().Unix())
+}