dbg

1 files changed, 73 insertions, 0 deletions

diff --git a/cmd/btrfs-rec/inpsect_dbg.go b/cmd/btrfs-rec/inpsect_dbg.go
new file mode 100644
index 0000000..a0dd92e
--- /dev/null
+++ b/cmd/btrfs-rec/inpsect_dbg.go
@@ -0,0 +1,73 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/datawire/dlib/dlog"
+	"github.com/datawire/ocibuild/pkg/cliutil"
+	"github.com/spf13/cobra"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect/scanforextents"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
+)
+
+func init() {
+	inspectors = append(inspectors, subcommand{
+		Command: cobra.Command{
+			Use:  "dbg DUMPSUMS.gob",
+			Args: cliutil.WrapPositionalArgs(cobra.ExactArgs(1)),
+		},
+		RunE: func(fs *btrfs.FS, cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			dlog.Infof(ctx, "Reading %q...", args[0])
+			sums, err := scanforextents.ReadAllSums(args[0])
+			if err != nil {
+				return err
+			}
+			dlog.Infof(ctx, "... done reading %q", args[0])
+
+			out := bufio.NewWriter(os.Stdout)
+
+			dlog.Info(ctx, "Walking sum tree...")
+			btrfsutil.NewBrokenTrees(ctx, fs).TreeWalk(ctx, btrfs.CSUM_TREE_OBJECTID,
+				func(err *btrfs.TreeError) {
+					dlog.Error(ctx, err)
+				},
+				btrfs.TreeWalkHandler{
+					Item: func(path btrfs.TreePath, item btrfs.Item) error {
+						if item.Key.ItemType != btrfsitem.EXTENT_CSUM_KEY {
+							return nil
+						}
+						body := item.Body.(btrfsitem.ExtentCSum)
+
+						for i, sum := range body.Sums {
+							laddr := btrfsvol.LogicalAddr(item.Key.Offset) + (btrfsvol.LogicalAddr(i) * scanforextents.CSumBlockSize)
+							fmt.Fprintf(out, "walk: %v=%q\n",
+								laddr, scanforextents.ShortSum(sum[:body.ChecksumSize]))
+						}
+						return nil
+					},
+				},
+			)
+
+			dlog.Info(ctx, "Dumping gob...")
+			_ = sums.WalkLogical(ctx, func(laddr btrfsvol.LogicalAddr, sum scanforextents.ShortSum) error {
+				fmt.Fprintf(out, "gob: %v=%q\n",
+					laddr, sum)
+				return nil
+			})
+
+			return out.Flush()
+		},
+	})
+}