From 74c486e9f8b2557e4bf764adbbd46642c175ea40 Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <git@lukegb.com>
Date: Sun, 20 Oct 2024 16:59:21 +0100
Subject: [PATCH 2/2] [shell] add fs.meta.edit for editing a filer metadata
 entry

---
 weed/shell/command_fs_meta_edit.go | 114 +++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 weed/shell/command_fs_meta_edit.go

diff --git a/weed/shell/command_fs_meta_edit.go b/weed/shell/command_fs_meta_edit.go
new file mode 100644
index 000000000..ece203b4d
--- /dev/null
+++ b/weed/shell/command_fs_meta_edit.go
@@ -0,0 +1,114 @@
+package shell
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+
+	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"github.com/seaweedfs/seaweedfs/weed/util"
+	"google.golang.org/protobuf/encoding/prototext"
+)
+
+func init() {
+	Commands = append(Commands, &commandFsMetaEdit{})
+}
+
+type commandFsMetaEdit struct {
+	dirPrefix *string
+}
+
+func (c *commandFsMetaEdit) Name() string {
+	return "fs.meta.edit"
+}
+
+func (c *commandFsMetaEdit) Help() string {
+	return `edit single file's metadata
+
+	fs.meta.edit /path/to/single/file
+`
+}
+
+func (c *commandFsMetaEdit) HasTag(CommandTag) bool {
+	return false
+}
+
+func (c *commandFsMetaEdit) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	if len(args) == 0 {
+		fmt.Fprintf(writer, "missing a path to a file\n")
+		return nil
+	}
+
+	metaEditCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	if err = metaEditCommand.Parse(args); err != nil {
+		return nil
+	}
+	path, parseErr := commandEnv.parseUrl(findInputDirectory(metaEditCommand.Args()))
+	if parseErr != nil {
+		return parseErr
+	}
+	filerPath := util.FullPath(path)
+
+	// Fetch entry.
+	fmt.Fprintf(writer, "%#v\n", filerPath)
+	entry, err := filer_pb.GetEntry(commandEnv, filerPath)
+	if err != nil {
+		return fmt.Errorf("getting entry data: %w", err)
+	}
+
+	// Write entry to temp file.
+	f, err := os.CreateTemp("", "seaweed-entry-*.txtpb")
+	if err != nil {
+		return fmt.Errorf("creating temp file: %w", err)
+	}
+	defer os.Remove(f.Name())
+
+	if _, err := f.Write([]byte(prototext.Format(entry))); err != nil {
+		return fmt.Errorf("writing formatted entry data: %w", err)
+	}
+
+	// Launch an editor.
+	editor := os.Getenv("VISUAL")
+	if editor == "" {
+		editor = os.Getenv("EDITOR")
+	}
+	if editor == "" {
+		editor = "vim"
+	}
+	cmd := exec.Command("sh", "-c", fmt.Sprintf("%s %s", editor, f.Name()))
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("editor failed: %w", err)
+	}
+
+	// Read edited entry.
+	if _, err := f.Seek(0, 0); err != nil {
+		return fmt.Errorf("seeking to beginning of file failed: %w", err)
+	}
+	editedBytes, err := io.ReadAll(f)
+	if err != nil {
+		return fmt.Errorf("reading edited entry: %w", err)
+	}
+	if err := prototext.Unmarshal(editedBytes, entry); err != nil {
+		return fmt.Errorf("parsing edited entry: %w", err)
+	}
+
+	// Write back entry to filer.
+	dir, _ := filerPath.DirAndName()
+	req := &filer_pb.UpdateEntryRequest{
+		Directory: dir,
+		Entry:     entry,
+	}
+	if err := commandEnv.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
+		return filer_pb.UpdateEntry(client, req)
+	}); err != nil {
+		return fmt.Errorf("updating entry in filer: %w", err)
+	}
+
+	return nil
+}
-- 
2.46.0