filelist/hookfiles: encapsulate dir searching out of slurpFiles

Move the directory searching / globbing code out of slurpFiles and into
the filelist module so it can be used elsewhere.

internal/filelist/filelist.go

@@ -1,6 +1,12 @@
 package filelist
 
-import "sync"
+import (
+	"fmt"
+	"path/filepath"
+	"sync"
+
+	"gitlab.com/postmarketOS/postmarketos-mkinitfs/internal/misc"
+)
 
 type FileLister interface {
 	List() (*FileList, error)
@@ -45,6 +51,26 @@ func (f *FileList) Import(src *FileList) {
 	}
 }
 
+func (f *FileList) AddGlobbed(src string, dest string) (error) {
+	fFiles, err := misc.GetFiles([]string{src}, true)
+	if err != nil {
+		return fmt.Errorf("unable to add %q: %w", src, err)
+	}
+	// loop over all returned files from GetFile
+	for _, file := range fFiles {
+		if len(fFiles) > 1 {
+			// Glob with arbitrary subdirectories, so we need to
+			// remove the src path and prepend the dest path
+			f.Add(file, filepath.Join(dest, file[len(src):]))
+		} else {
+			// dest path specified, and only 1 file
+			f.Add(file, dest)
+		}
+	}
+
+	return nil
+}
+
 // iterate through the list and and send each one as a new File over the
 // returned channel
 func (f *FileList) IterItems() <-chan File {

internal/filelist/hookfiles/hookfiles.go

@@ -10,7 +10,6 @@ import (
 	"strings"
 
 	"gitlab.com/postmarketOS/postmarketos-mkinitfs/internal/filelist"
-	"gitlab.com/postmarketOS/postmarketos-mkinitfs/internal/misc"
 )
 
 type HookFiles struct {
@@ -60,22 +59,13 @@ func slurpFiles(fd io.Reader) (*filelist.FileList, error) {
 	for s.Scan() {
 		src, dest, has_dest := strings.Cut(s.Text(), ":")
 
-		fFiles, err := misc.GetFiles([]string{src}, true)
-		if err != nil {
-			return nil, fmt.Errorf("unable to add %q: %w", src, err)
-		}
-		// loop over all returned files from GetFile
-		for _, file := range fFiles {
 		if !has_dest {
-				files.Add(file, file)
-			} else if len(fFiles) > 1 {
-				// Don't support specifying dest if src was a glob
-				// NOTE: this could support this later...
-				files.Add(file, file)
-			} else {
-				// dest path specified, and only 1 file
-				files.Add(file, dest)
+			dest = src
 		}
+
+		err := files.AddGlobbed(src, dest)
+		if err != nil {
+			return nil, err
 		}
 	}