WIP: Switch to new config format.

Don't use jobrun for daemon, just call JobDo() once, the job must
organize stuff itself.

Sacrifice all the oneshot commands, they will be reintroduced as
client-calls to the daemon.

cmd/config_fsvfilter.go

@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"github.com/zrepl/zrepl/zfs"
+	"strings"
+	"github.com/pkg/errors"
+)
+
+type PrefixSnapshotFilter struct {
+	Prefix string
+}
+
+func parsePrefixSnapshotFilter(i string) (f *PrefixSnapshotFilter, err error) {
+	if !(len(i) > 0) {
+		err = errors.Errorf("snapshot prefix must be longer than 0 characters")
+		return
+	}
+	f = &PrefixSnapshotFilter{i}
+	return
+}
+
+func (f *PrefixSnapshotFilter) Filter(fsv zfs.FilesystemVersion) (accept bool, err error) {
+	return fsv.Type == zfs.Snapshot && strings.HasPrefix(fsv.Name, f.Prefix), nil
+}
+