'wdcli backup': Rework backup process

This commit reworks the backup process to dynamically find the list of
components.

internal/component/dis/resolver.go

@@ -1,61 +0,0 @@
-package dis
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"regexp"
-
-	"github.com/FAU-CDI/wdresolve"
-	"github.com/FAU-CDI/wdresolve/resolvers"
-	"github.com/tkw1536/goprogram/stream"
-)
-
-func (dis Dis) ResolverConfigPath() string {
-	return filepath.Join(dis.Dir, dis.ResolverFile)
-}
-
-func (dis Dis) resolver(io stream.IOStream) (p wdresolve.ResolveHandler, err error) {
-	p.TrustXForwardedProto = true
-
-	fallback := &resolvers.Regexp{
-		Data: map[string]string{},
-	}
-
-	// handle the default domain name!
-	domainName := dis.Config.DefaultDomain
-	if domainName != "" {
-		fallback.Data[fmt.Sprintf("^https?://(.*)\\.%s", regexp.QuoteMeta(domainName))] = fmt.Sprintf("https://$1.%s", domainName)
-		io.Printf("registering default domain %s\n", domainName)
-	}
-
-	// handle the extra domains!
-	for _, domain := range dis.Config.SelfExtraDomains {
-		fallback.Data[fmt.Sprintf("^https?://(.*)\\.%s", regexp.QuoteMeta(domain))] = fmt.Sprintf("https://$1.%s", domainName)
-		io.Printf("registering legacy domain %s\n", domain)
-	}
-
-	// open the prefix file
-	prefixFile := dis.ResolverConfigPath()
-	fs, err := os.Open(prefixFile)
-	io.Println("loading prefixes from ", prefixFile)
-	if err != nil {
-		return p, err
-	}
-	defer fs.Close()
-
-	// read the prefixes
-	// TODO: Do we want to load these without a file?
-	prefixes, err := resolvers.ReadPrefixes(fs)
-	if err != nil {
-		return p, err
-	}
-
-	// and use that as the resolver!
-	p.Resolver = resolvers.InOrder{
-		prefixes,
-		fallback,
-	}
-
-	return p, nil
-}