[PATCH 03/12] common/encrypt: add btrfs to get_ciphertext_filename

[Josef Bacik]

From: Sweet Tea Dorminy <sweettea-ker...@dorminy.me>

Add the relevant call to get an encrypted filename from btrfs.

Signed-off-by: Sweet Tea Dorminy <sweettea-ker...@dorminy.me>
---
 common/encrypt | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/common/encrypt b/common/encrypt
index fc1c8cc7..2c1925da 100644
--- a/common/encrypt
+++ b/common/encrypt
@@ -618,6 +618,19 @@ _get_ciphertext_filename()
        local dir_inode=$3
 
        case $FSTYP in
+       btrfs)
+               # Extract the filename from the inode_ref object, similar to:
+               # item 24 key (259 INODE_REF 257) itemoff 14826 itemsize 26
+               #       index 3 namelen 16 name: 
J\xf7\x15tD\x8eL\xae/\x98\x9f\x09\xc1\xb6\x09>
+               #
+               $BTRFS_UTIL_PROG inspect-internal dump-tree $device | \
+                       grep -A 1 "key ($inode INODE_REF " | tail -n 1 | \
+                       perl -ne '
+                               s/.*?name: //;
+                               chomp;
+                               s/\\x([[:xdigit:]]{2})/chr hex $1/eg;
+                               print;'
+               ;;
        ext4)
                # Extract the filename from the debugfs output line like:
                #
@@ -715,6 +728,9 @@ _require_get_ciphertext_filename_support()
                        _notrun "dump.f2fs (f2fs-tools) is too old; doesn't 
support showing unambiguous on-disk filenames"
                fi
                ;;
+       btrfs)
+               _require_command "$BTRFS_UTIL_PROG" btrfs
+               ;;
        *)
                _notrun "_get_ciphertext_filename() isn't implemented on $FSTYP"
                ;;
-- 
2.41.0